Entries |
Document | Title | Date |
20080205094 | Power Supply Unit for the Motor of a Magnetic Levitation Railway System - A power supply to the motor of a magnetic levitation railway system is provided with higher shut-off security which is comparably more economical and compact, and has a shorter shut-off time. As a result, a power supply device of at least one embodiment is provided with a frequency converter which is connected in a direct manner to an energy supply network with the input switching system. The frequency converter contains a rectifier which is arranged downstream from the input switching system, an intermediate circuit which is connected to the rectifier, an inverted rectifier end step which is arranged downstream from the intermediate circuit and which comprises an associated control device and an output switching system which is connected to the inverted rectifier end step and which is directly connected to the motor. The control input of the input switching system and the control input of the output switching system are connected to an operational control device which produces a shut-off command, and the intermediate circuit includes a short circuiter for the discharge thereof, the short circuiter being connected with the control input thereof to the operational control device. | 08-28-2008 |
20080219034 | Circuit, Shrink Fixing and Regulation Method | 09-11-2008 |
20080232143 | METHOD OF DESIGNING A STATIC SYNCHRONOUS COMPENSATOR BASED ON PASSIVITY-BASED CONTROL - This invention presents a method of novel nonlinear control for designing Static Synchronous Compensators (STATCOM). A passivity-based approach is proposed for designing robust nonlinear STATCOM controller. The mathematical model of STATCOM will be represented by an Euler-Lagrange (EL) system corresponding to a set of EL parameters. By employing the Park's transformation, the differential geometry approach is used to investigate the power system dynamics with considering STATCOM under the synchronous d-q frame. The energy-dissipative properties of the proposed model derived in the synchronous d-q rotating frame are fully retained. This model also consider the dynamic response of the changable load. Finally, the passivity-based control is employed by using energy shaping and damping injection techniques to produce the proper control signals for Voltage Source Converter. So that the system embedded with STATCOM is more robust and stable. | 09-25-2008 |
20080239769 | DEVICE FOR TRANSFORMING A PRIMARY AC VOLTAGE IN A LOWER AC VOLTAGE FOR SUPPLYING AN ELECTRICAL LOAD - A device for transforming an AC voltage to a lower AC voltage includes a generator of a PWM control signal and a first bidirectional switch to couple a load to the AC voltage during a conduction-phase. A second bidirectional switch discharges energy from the load during an off-phase of the first bidirectional switch. A first driving circuit of the first bidirectional switch is input with the PWM control signal and generates a first PWM signal, applied between control and conduction terminals of the first bidirectional switch. A second driving circuit for the second bidirectional switch is input with the PWM control signal and generates a second PWM signal, in phase opposition to the first PWM signal, applied between control and conduction terminals of the second bidirectional switch. An electric decoupling circuit is between the generator and second driving circuit. A transformer is between respective conduction terminals of the bidirectional switches. | 10-02-2008 |
20080259658 | Limit for the harmonics of a current - A wiring arrangement and an appliance for limiting the harmonics of a current supplied to a frequency converter from an AC electricity supply network, which frequency converter can be connected to a three-phase AC electricity supply network, in which frequency converter is an uncontrolled network bridge ( | 10-23-2008 |
20080278976 | DYNAMIC VOLTAGE SAG CORRECTION - A voltage sag correction device includes an input terminal adapted to receive a first operating signal having a line-to-neutral voltage. The first operating signal is provided to a load through an output terminal. A regulator module includes a rectifying device adapted to rectify a line-to-line input signal, a storage unit adapted to store energy corresponding to the rectified line-to-line input signal, and an inverter switching device adapted to use the stored energy to generate a correction signal during at least a portion of a voltage sag. An injection transformer in electrical communication with the regulator module is adapted to reduce a voltage of the correction signal. A bypass switch is in a closed position during a normal operating condition such that the injection transformer is bypassed. The bypass switch is in an open position during at least a portion of the voltage sag such that the injection transformer is energized. | 11-13-2008 |
20080285314 | ADVANCED MATRIX CONVERTER AND METHOD FOR OPERATION - A matrix converter may be provided with AC switches that comprise bi-directional sets of semiconductor switches that are gated with a common gating link. A low loss diode-bridge based snubber may facilitate introduction of time delay between sequential operations of the bi-directional set of semiconductor switches. The matrix converter may be operated in a three-phase mode with only one gating signals for each AC switch, in contrast to prior-art matrix converters which may require use multiple gating signals for each AC switch. | 11-20-2008 |
20080291704 | DRIVING DEVICE AND METHOD FOR PROVIDING AN AC DRIVING SIGNAL TO A LOAD - In a driving device and method for providing an AC driving signal to a load, a first voltage converting unit converts an external AC voltage signal into a DC voltage signal using pulse width modulation in response to a feedback signal that is generated by a summing unit based on a standard voltage signal generated by a voltage detecting unit from the DC voltage signal, and a current detecting signal corresponding to a current flowing through the load and generated by a current detecting unit. A second voltage converting unit converts the DC voltage signal from the first voltage converting unit into the AC driving signal based on an external burst signal, and outputs the AC driving signal to the load. | 11-27-2008 |
20080298096 | Dual voltage wye-connected H-bridge converter topology for powering a high-speed electric motor - A topology for a three-phase, wye-connected H-bridge converter allowing continued operation when one H-bridge phase has failed by bypassing the failed H-bridge, increasing dc-bus voltage to provide the required output load voltage, and decreasing switching frequency to reduce power losses in semiconductor switches. In normal operation, the dc-bus voltage is operated at a lower voltage, improving the reliability of power semiconductor devices. When an H-bridge is bypassed, the dc-bus is operated at a higher voltage but lower effective switching frequency, reducing semiconductor losses, allowing the converter to put out more current with the same temperature rise in the power switches. | 12-04-2008 |
20090021963 | Uninterruptible power supply, connected to a grid - The present invention relates to an Uninterruptible Power Supply and a method for operating an Uninterruptible Power Supply, where the UPS is connected between a grid and a consumer, where the UPS is rectifying the power from the grid for generating DC, which DC is used as source for an inverter, which inverter generates power for the consumer. The main object of the invention is to achieve UPS to bridge the grid voltage drops by supplying power for one-phase or multi-phase consumer in a short period after a grid failure. The object can be achieved if the preamble to claim | 01-22-2009 |
20090052209 | Inverter Device - An inverter device includes a converter circuit that rectifies a first alternating current output from a power supply to generate a rectified current, a capacitor that stores therein the rectified current and outputs a direct current based on the rectified current, and an inverter circuit that converts the direct current into a second alternating current for driving a load. Moreover, a voltage control unit generates and outputs, during a period when any one of an instantaneous power cut and an instantaneous voltage drop occurs in the power supply, a first current command based on a voltage of the capacitor and a second current command; and a current control unit generates and outputs, based on the first current command, the second current command for controlling the inverter circuit to output the second alternating current. | 02-26-2009 |
20090086515 | DIRECT AC POWER CONVERTING APPARATUS - Capacitors are connected in series between a first DC link section and a second DC link section when the capacitors are charged by a regenerative current derived from an inverter section. During discharge, as first, second switching circuits turn on, the capacitors are discharged with those capacitors connected in parallel between a first DC link section and a second DC link section. | 04-02-2009 |
20090091955 | Quasi resonant switching mode power supply - A switching mode power supply (SMPS) and a driving method thereof are provided. The SMPS includes a power supply block that includes a first switch coupled to a first coil of a primary side of a transformer for converting an input voltage, wherein the power supply block supplies power to a second coil and a third coil of a secondary side of the transformer according to operation of the first switch; and a PWM signal generator determines a turn-on time of the first switch according to the input voltage, and the turn-on time is determined regardless of a power magnitude of an output terminal connected to the second coil. Accordingly, screen noise due to a ripple can be eliminated and stress on the switch breakdown due to excessive power input can be reduced to enable an SMPS with stable driving. | 04-09-2009 |
20090116265 | DRIVING CIRCUIT FOR POWER SWITCHING DEVICE, DRIVING METHOD THEREOF, AND SWITCHING POWER SUPPLY APPARATUS - A driving circuit according to the present invention is a driving circuit which drives the voltage control type switching device in the switching power supply apparatus and includes: a generation unit configured to generate a driving signal for turning on and off the voltage control type switching device, the driving signal having plural levels of voltage at which the voltage control type switching device is turned on; and a switching control unit configured to switch between the plural levels of voltage at which the power switching device is turned on, depending on a status of the power switching device. | 05-07-2009 |
20090129126 | Single Phase Power Supply for Inductively Coupled Power Transfer Systems - An ICPT system has a single phase power supply which energises a conductive path ( | 05-21-2009 |
20090135630 | Converter And Power Converter That Becomes It With The Converter - A converter includes a converter circuit | 05-28-2009 |
20090147549 | Power converters - The present invention provides a power converter that can be used to interface a generator ( | 06-11-2009 |
20090154201 | ALTERNATING VOLTAGE GENERATOR EQUIPPED WITH A CURRENT LIMITING DEVICE - The invention relates to an alternating voltage generator ( | 06-18-2009 |
20090237961 | INVERTER - The inverter comprises a diode bridge ( | 09-24-2009 |
20090237962 | MULTI LEVEL INVERTER - The present invention relates to a multilevel inverter comprising: a converter unit converting an inputted AC power source to a direct current (DC) power source; a film capacitor rectifying the DC power source converted by the converter unit; an inverter unit converting the rectified DC power source to a three-phase current in response to a pulse width modulation (PWM) control signal and outputting the current; a current detector detecting a current outputted from the inverter unit; a power cell main controller generating a voltage instruction and a voltage instruction using the detected current; and a PWM controller generating the pulse width modulation (PWM) control signal using the voltage instruction and frequency instruction. | 09-24-2009 |
20090316447 | POWER SUPPLY HAVING MAXIMUM POWER POINT TRACKING FUNCTION - The present invention relates to power supplies, and more particularly, to a power supply having a maximum power point tracking function that can reduce manufacturing costs and circuit size by using a maximum power point tracking section with a simplified circuit in a solar photovoltaic power generator supplying power using sunlight instead of using a micro controller, the maximum power point tracking section that controls power switching according to a result of integration of a value obtained by dividing a power variation by a voltage variation to track a maximum power value. A power supply having a maximum power point tracking function according to an aspect of the invention may include: a converter section switching input power, and converting the switched input power into predetermined DC power; and a maximum power point tracking section detecting a voltage and a power value of the input power, dividing a variation of the detected power by a variation of the detected voltage, integrating a result of the division, and controlling the switching operation of the converter section according to a value of the integration. | 12-24-2009 |
20100002475 | LOW VOLTAGE RIDE THROUGH - A system for connecting a wind turbine generator to a utility power network includes a first power converter that converts an AC signal from the wind turbine generator to a DC signal and supplies a controlled amount of reactive current to the wind turbine generator. The system also includes a second power converter, connected in series with the first converter, which converts the DC signal from the first power converter to a line-side AC signal and supplies a controlled amount of current to the utility power network. A power dissipation element is coupled to the first and second power converters for dissipating power from the first power converter. | 01-07-2010 |
20100002476 | APPARATUS AND METHOD FOR SHAPING AN INPUT SIGNAL TO EFFECT A DESIRED OUTPUT SIGNAL - An apparatus for shaping a varying input voltage signal received at an input locus to effect a desired varying output voltage signal at an output locus includes: (a) at least one energy transferring unit coupled with the input locus and with the output locus; and (b) at least one energy storing unit coupled with the at least one energy transferring unit. The at least one energy transferring unit presents at least one predetermined range of the input voltage signal at the output locus. The at least one energy transferring unit cooperates with the at least one energy storing unit to store energy in the at least one energy storing unit and to present energy from the at least one energy storing unit at the output locus when the input voltage signal is not presented at the output locus. | 01-07-2010 |
20100002477 | MULTI-PHASE VOLTAGE CONVERTING DEVICE, VEHICLE AND CONTROL METHOD OF MULTI-PHASE VOLTAGE CONVERTING DEVICE - A multi-phase voltage converting device includes voltage converters each performing voltage conversion based on a control period selected from among a plurality of predetermined control periods, and a control device indicating the control period to the voltage converters. The control device updates the control period of voltage converters in a predetermined period related commonly to the plurality of control periods. The update period is a least common multiple of the plurality of control periods. The plurality of voltage converters are n in number, and the control device successively updates the control periods for the plurality of voltage converters with a time difference equal to 1/n of the update period. Thereby, the multi-phase voltage converting device suppressing output voltage ripples can be provided. | 01-07-2010 |
20100014325 | AC-AC CONVERTER WITH HIGH FREQUENCY LINK - An AC-AC Converter for an AC source which in one embodiment has a first rectifier section rectifying the AC source into a first pulsed DC link voltage signal and a high frequency modulating section coupled to the first pulsed DC link voltage signal and producing a high frequency AC voltage signal. A high frequency transformer is coupled to the high frequency AC voltage signal producing a transformed high frequency AC signal. There is a second rectifier section coupled to the transformed high frequency AC signal and producing a second pulsed DC voltage signal and an unfolder section coupled to the second pulsed DC voltage signal and producing an output AC signal. | 01-21-2010 |
20100020571 | INVERTER GENERATOR - In an inverter generator having an engine generator unit, a converter that converts generated alternating current to direct current, an inverter that converts the direct current to alternating current with switching elements to supply to an electrical load, an inverter driver that drives the switching elements with a PWM signal and makes the alternating current of a predetermined frequency, the alternating current supplied to the electrical and voltages of the direct and alternating currents are detected, the detected voltage of the alternating current is corrected as a predetermined value based on a coefficient (DCgainA) set based on the detected voltage of the direct current, when the detected alternating current is greater than a threshold value, and the PWM signal is corrected by the predetermined, thereby limiting overcurrent. | 01-28-2010 |
20100020572 | INVERTER GENERATOR - In an inverter generator having an engine generator having a generator unit, a converter that converts generated alternating current to direct current, an inverter that converts the direct current to alternating current with switching elements to supply to an electrical load, an inverter driver that drives the switching elements with a PWM signal using a reference sine wave of a desired output voltage waveform and a carrier at every control cycle (step) determined by a carrier frequency and makes the alternating current of a predetermined frequency, the inverter driver varies the carrier frequency in accordance with inclination of the reference sine wave, more specifically decreases the carrier frequency as decreasing inclination of the reference sine wave. | 01-28-2010 |
20100033996 | POWER CONVERTING APPARATUS - A detected DC voltage value estimation mechanism samples detected DC voltage values at specific intervals of a period T, stores detected DC voltage values V | 02-11-2010 |
20100054002 | PARALLEL-CONNECTED UNINTERRUPTED POWER SUPPLY CIRCUIT - The configurations of a parallel-connected UPS circuit are provided in the present invention. The proposed circuit includes a neutral, a battery having a positive and a negative terminals, and a plurality of PFC boost converters, each of which includes a PFC circuit including an inductor having a first terminal coupled to the positive terminal and a second terminal, a rectifying bridge coupled to the second terminal of the inductor, and having a first terminal and a second terminal coupled to the negative terminal, a switch bridge having a first terminal coupled to the first terminal of the rectifying bridge and a second terminal coupled to the second terminal of the rectifying bridge, and a control switch having a first terminal and a second terminal coupled to the neutral. | 03-04-2010 |
20100067264 | POWER CONVERSION APPARATUS - Provided is a power conversion apparatus in which a main circuit is provided with a plurality of switches, and power conversion is performed to generate power for supply to a three-phase AC load from a three- or single-phase AC power supply. At least some of the plurality of switches are configured, using a bidirectional switch including a normally-on device that is turned OFF when a gate circuit is provided with either a positive or negative voltage, and a normally-off device that is turned ON when the gate circuit is provided with either a positive or negative voltage, to provide only a specific unidirectional current flow when the gate circuit is not activated, and when the gate circuit is activated, provide a bidirectional current flow and control the current flow to direct only in an arbitrary unidirectional way. By providing the power conversion apparatus with a capability of directing back, to a load such as motor, any power coming therefrom, the resulting power conversion apparatus requires no direct-current link capacitor and a diode clamping circuit. | 03-18-2010 |
20100073969 | PHOTOVOLTAIC INTEGRATED VARIABLE FREQUENCY DRIVE - A photovoltaic (PV) integrated variable frequency drive system having a variable frequency drive and an energy source. The variable frequency drive having a back end inverter, a DC bus electrically connected to the back end inverter, and an active front end electrically connected to the DC bus to facilitate bi-directional power flow to and from a power grid. The energy source being electrically connected to the DC bus. | 03-25-2010 |
20100073970 | Modular multi-pulse transformer rectifier for use in symmetric Multi-level power converter - In one embodiment, a system may include multiple transformers each to provide an output to one or more power cells, where the power cells provide AC power to a load. Each transformer may have at least one primary winding and multiple secondary windings, where the primary winding of each transformer is phase shifted with respect to its neighboring transformers and the secondary windings are also phase shifted. The phase shift of the primary winding can be based on the phase shift of the secondary windings and a number of the plurality of transformers. | 03-25-2010 |
20100080021 | UNINTERRUPTIBLE POWER SUPPLY WITH TOTAL ISOLATION - An uninterruptible power supply includes an isolation transformer having dual primary windings. The secondary winding generates an output voltage based on the magnetic field generated in one of the dual primary windings. A first primary winding is coupled to an inverter circuit that receives an alternating current input voltage and applies a clean and filter alternating current to the first primary winding. A second primary winding is coupled to a bypass circuit that applies a bypass voltage when the inverter circuit is in a failure state. The power supply also includes a compensation circuit to maintain the output voltage at a desired level. | 04-01-2010 |
20100142233 | POWER CONVERSION DEVICE AND CONTROL METHOD THEREOF - A power conversion device is provided for converting a DC voltage to an alternating current corresponding to an AC voltage according to the AC voltage, which includes a power conversion unit and an output unit. The power conversion unit converts the DC voltage to a high-frequency current having two envelops corresponding to the waveform of the AC voltage. The output unit includes an inductive circuit, a full-wave rectifying circuit, an inverter circuit and a filter circuit. The inductive circuit provides two induced currents according to the high-frequency current, wherein one induced current and the high-frequency current are in phase, and the other induced current and the high-frequency current are in antiphase. The full-wave rectifying circuit full-wave rectifies the two induced currents. The inverter circuit alternatively transfers the two full-wave rectified induced currents, and thus output an output current. The filter circuit filters the output current to provide the alternating current. | 06-10-2010 |
20100149841 | POWER FEEDBACK DEVICE - The present invention relates to a power feedback device, including: an AC input power source, which is three-phase or multi-phase AC, or three-phase or multi-phase AC in which the output terminal is connected in series with an inductor, for generating power; a plurality of power converting units, the input terminals of which are respectively connected with two phases of the AC input power source, for power converting the two phases of AC generated by the AC input power source respectively; an isolating transformer, the primary side of which is a three-phase winding and connected with a power network, the secondary side of which is multi-path of three-phase windings and connected with the output terminals of the plurality of power converting units, for feeding the AC converted by the plurality of power converting units back to the power network. The power feedback device according to the present invention can improve the waveform coefficients of the current of the power generation device, and increase the power factors and the utilization rate of the device, and also, the device matches power networks of different voltage levels, thereby improving the waveform coefficients of the current fed back to the power networks and lowering harmonic component. | 06-17-2010 |
20100165674 | POWER CONVERSION SYSTEMS AND METHODS FOR CONTROLLING HARMONIC DISTORTION - Control systems, methods and power conversion systems are presented for controlling harmonic distortion, in which multi-sampling space vector modulation (SVM) is employed for controlling power converter switching devices, with a reference vector being sampled two or more times during each SVM period to update the SVM dwell times more than once during each SVM cycle. | 07-01-2010 |
20100172161 | SYSTEMS AND METHODS FOR COMMON-MODE VOLTAGE REDUCTION IN AC DRIVES - Control systems, methods and power conversion systems are presented for controlling common mode voltages in AC motor loads driven by inverter PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by one phase switching state from a last vector of a switching sequence of an adjacent sector, along with enhanced deadtime compensation and reflected wave reduction techniques in providing pulse width modulated switching signals to a switching inverter. | 07-08-2010 |
20100172162 | SYSTEMS AND METHODS FOR COMMON-MODE VOLTAGE REDUCTION IN FULLY REGENERATIVE AC DRIVES - Control systems, methods and fully regenerative power conversion systems are presented for mitigating common mode voltages in AC loads by employing inverter and/or active rectifier PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by one phase switching state from a last vector of a switching sequence of an adjacent sector. | 07-08-2010 |
20100182810 | ALTERNATING-CURRENT POWER SUPPLY DEVICE - An alternating-current power supply device includes: a direct-current power supply Vin; a transformer T | 07-22-2010 |
20100202168 | Power supply circuit - The present invention provides a power supply circuit without current transformers. A voltage increasing chopping is is applied to an alternating current input between a common line and another input terminal under control of a control circuit and a voltage increasing chopper circuit and filter, to obtain voltage-increased direct-current voltage at the positive and negative charge sides relative the common line, and to improve the power factor, the stabilized direct-current voltage is converted to alternating current voltage by a subsequent half bridge type DC-AC inverter. High-Frequency components are are removed by an output filter comprising a reactor and condenser. An input current detecting resistance is placed in the common line and an output current detecting resistance is placed at the output filter produce input and output current information for the control circuit. | 08-12-2010 |
20100214808 | POWER CONDITIONING UNIT - The present invention relates to a power conditioning unit for delivering power from a dc power source to an ac output, particularly ac voltages greater than 50 volts, either for connecting directly to a grid utility supply, or for powering mains devices independent from the mains utility supply. We describe a power conditioning unit for delivering power from a dc power source to an ac mains output, the power conditioning unit comprising an input for receiving power from said dc power source, an output for delivering ac power, an energy storage capacitor, a dc-to-dc converter having an input connection coupled to said input and an output connection coupled to the energy storage capacitor, and a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output, wherein said energy storage capacitor has a capacitance of less than twenty microfarads. | 08-26-2010 |
20100246217 | DIRECT AC POWER CONVERTING APPARATUS - A control section controls a current-source converter simultaneously with or prior to conduction of a power supply switch to connect a clamp capacitor and capacitors between a first input line on which a resistor is provided and any one of second and third input lines in parallel with each other. Accordingly, current is transmitted to the clamp capacitor via the resistor when the power supply switch is brought into conduction, which prevents inrush current from flowing to the clamp capacitor. In addition, for example, the capacitors are not charged prior to the clamp capacitor, whereby it is possible to prevent the inrush current from flowing from the capacitors to the clamp capacitor when they are connected in parallel with each other. | 09-30-2010 |
20100246218 | POWER FACTOR CONTROL CIRCUIT AND MAINS POWER SUPPLY - The invention relates to a power factor control circuit ( | 09-30-2010 |
20100254168 | Magnetic Device Formed with U-Shaped Core Pieces and Power Converter Employing the Same - A magnetic device formed with U-shaped core pieces employable in a power converter, and a method of forming the same. In one embodiment, the magnetic device includes a rectilinear core piece formed of a magnetic material, and first and second U-shaped core pieces positioned on the rectilinear core piece. The magnetic device also includes first and second conductive windings formed about the first and second U-shaped core pieces, respectively. | 10-07-2010 |
20100254169 | SYSTEM-INTERCONNECTED INVERTER - A system-interconnected inverter connected to a commercial system for supplying AC power, which inverter includes a switching device for turning on and off DC power based on a predetermined duty value to output a voltage whose frequency is the same as that of a system power source and a controller for controlling the switching device. The controller changes the duty value of the switching device in accordance with the value obtained by dividing the maximum value by the effective value of the output current from the switching device measured with the system-interconnected inverter disconnected from the system power source. | 10-07-2010 |
20100284204 | POWER SYSTEM WITH SHARED CLAMP RESET - A power supply includes a first power converter, a second power converter, and a clamp reset circuit. The clamp reset circuit is electrically coupled to other components within the first power converter and the second power converter. A clamp standby connection can be provided to electrically couple the clamp reset circuit to components comprising the second power converter. The clamp reset circuit is coupled to reduce magnetizing energy of a transformer of the first power converter and limit voltage in a component of the second power converter. The clamp reset circuit may include a Zener diode and a resistor that are adapted to reduce magnetizing energy of the first power converter and manage leakage inductance energy through the second power converter. The clamp reset circuit normally includes a capacitor that is adapted to store energy from the first power converter and the second power converter. | 11-11-2010 |
20100309692 | POWER CONDITIONING UNITS - We describe a power conditioning unit with maximum power point tracking (MPPT) for a dc power source, in particular a photovoltaic panel. A power injection control block has a sense input coupled to an energy storage capacitor on a dc link and controls a dc-to-ac converter to control the injected mains power. The power injection control block tracks the maximum power point by measuring a signal on the dc link which depends on the power drawn from the dc power source, and thus there is no need to measure the dc voltage and current from the dc source. In embodiments the signal is a ripple voltage level and the power injection control block controls an amplitude of an ac current output such that an amount of power transferred to the grid mains is dependent on an amplitude of a sinusoidal voltage component on the energy storage capacitor. | 12-09-2010 |
20100315845 | POWER SOURCE CIRCUIT AND PROJECTION DISPLAY DEVICE - A power source circuit includes a DC voltage generating section which rectifies and smoothes an input AC voltage to generate a DC voltage; a switching regulator which converts the DC voltage into an AC voltage; a transformer which lowers the AC voltage; a first switch connected between a secondary winding of the transformer, and a load; and a control section which controls on/off of the switch. The control section controls the first switch to turn off the first switch at a time of a waiting mode. | 12-16-2010 |
20100321965 | DIRECT POWER CONVERTING APPARATUS - A transistor is brought into conduction when, for example, a voltage between both ends of a second clamp capacitor exceeds a predetermined reference voltage. A resistance value of a discharge resistor is smaller than a value obtained by dividing the reference voltage by the maximum value of a current flowing through the discharge resistor. When the transistor is brought into conduction as a result of a voltage between both ends of the second clamp capacitor exceeding the predetermined reference voltage, a voltage applied to the discharge resistor, which results from a regenerative current, is larger one of the voltage between both ends of the second clamp capacitor and a voltage drop of the discharge resistor due to the regenerative current. The voltage drop and the voltage between both ends are smaller than a voltage between DC power supply lines, whereby it is possible to reduce an electrostatic capacitance of the discharge resistor. | 12-23-2010 |
20110007530 | Variable frequency drive soft charge circuit - A variable frequency drive comprises a diode rectifier receiving multiphase AC power and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A link capacitor is across the bus. A soft charge circuit limits in rush current to the link capacitor. The soft charge circuit comprises an inductor in the bus and a resistor assist circuit across the inductor along with an anti-parallel clamping thyristor reverse connected also across the inductor. | 01-13-2011 |
20110007531 | DIRECT AC POWER CONVERTING APPARATUS - A control section controls a current-source converter in a state in which a switch is in conduction, and performs voltage doubler rectification on a voltage between a neutral phase input line and any of input lines to provide for charging of clamp capacitors. Accordingly, the clamp capacitors are charged through a resistor, which prevents an inrush current from flowing therethrough. In addition, a voltage between both ends of a pair of the clamp capacitors is higher than, for example, a voltage between both ends of a pair of capacitors. Accordingly, even if the clamp capacitors and, for example, the capacitors are electrically connected to each other in a normal operation, it is possible to prevent the inrush current from flowing from the capacitors to the clamp capacitors. | 01-13-2011 |
20110013427 | UTILITY GRID POWER AVERAGING AND CONDITIONING - As system is disclosed for providing power averaging for the utility grids and more specifically to utilizing a unique EESU unit with the capability to store electrical energy over 24 hour periods each day and provide power averaging to homes, commercial, and industrial sites to reduce the peak power requirements. Charging such power averaging units during the non-peak times and delivering the energy during the peak-demands times provides for more efficient utilization of utility-grid power-generating plants and the already existing power transmission lines. Such a unit may also have the capability of isolating the users from utility-grid power failures, transients, and AC noise. | 01-20-2011 |
20110013428 | MODULAR MULTI-PULSE TRANSFORMER RECTIFIER FOR USE IN ASYMMETRIC MULTI-LEVEL POWER CONVERTER - In one embodiment, the present invention includes a system having multiple modular transformers each including a primary winding coupled to an input power source and phase-shifted secondary windings each coupled to a power cell. The system further includes different phase output lines coupled to a load. These lines may include first, second and third phase output lines. | 01-20-2011 |
20110026280 | POWER CONVERSION APPARATUS - The invention relates to a power conversion apparatus including a converter circuit and an inverter circuit. The invention allows more precise output control of the inverter circuit than a power conversion apparatus in which the output control is performed based on a current value only, thereby improving operation efficiency. A current sensor detects input current of the inverter circuit, and a voltage sensor detects input voltage of the inverter circuit. A power value calculator section in an inverter microcomputer obtains a power value based on the input current and the input voltage. The inverter microcomputer and the control microcomputer perform droop control of reducing the output of the inverter circuit to make the power value smaller than a predetermined power value. | 02-03-2011 |
20110032734 | CASCADED SWITCHING POWER CONVERTER FOR COUPLING A PHOTOVOLTAIC ENERGY SOURCE TO POWER MAINS - A cascaded switching power converter for coupling a photovoltaic (PV) energy source to power mains provides a high-efficiency and a potentially simple control mechanism for AC solar energy conversion systems. The PV energy source charges a capacitive storage element through a DC-DC converter, and an inverter couples energy from the capacitive storage element to the mains supply. The DC-DC converter is controlled so that ripple present on the capacitive storage element due to current drawn by the inverter is not reflected at the input of the DC-DC converter, which is accomplished by varying the conversion ratio of the DC-DC converter with the ripple voltage present across the capacitor. The average voltage of the capacitor can also be increased with increases in the available power output from the PV energy source, so that a corresponding increase in power is transferred to the mains supply. | 02-10-2011 |
20110038186 | DIGITAL CONTROL FOR CONTROLLING AND LINEARIZING AN AC IMPEDANCE - An apparatus for regulating AC power of a power source in a power circuit is provided. The apparatus includes a full-wave bridge rectifier, a power transistor array, and a controller. The full-wave bridge rectifier is configured to receive an AC input put from the power source. The power transistor array is connected to the full-wave bridge rectifier. The power transistor array is configured to receive the AC input from the full-wave bridge rectifier and to generate an AC signal. The power transistor array may include only a single transistor or a plurality of transistors connected in series, for example. The controller is connected to the power transistor array. The controller is configured to receive the AC signal from the power transistor array, or the output of the AC regulator in some embodiments, and to determine a correction output to send to the power transistor array to control an AC impedance of the power circuit to generate an AC output. | 02-17-2011 |
20110044077 | 3-PHASE HIGH-POWER UPS - According to one aspect, embodiments of the invention provide power converter circuitry including an input including a plurality of input lines each configured to be coupled to a phase of a multiphase AC power source having a sinusoidal waveform, a plurality of DC buses including a first positive DC bus having a first nominal DC voltage, a second positive DC bus having a second nominal DC voltage, a first negative DC bus having a third nominal DC voltage and a second negative DC bus having a fourth nominal DC voltage; a first power converter coupled to the input and configured to supply power from the multiphase AC power source to the plurality of DC buses during a first positive region of the sinusoidal waveform and a first negative region of the sinusoidal waveform; and a second power converter coupled to the input and configured to supply power from the multiphase AC power source to at least some of the plurality of DC buses during a second positive region of the sinusoidal waveform and a second negative region of the sinusoidal waveform. | 02-24-2011 |
20110051474 | RESONANT POWER CONVERSION APPARATUS - A resonant power conversion apparatus includes a transformer T | 03-03-2011 |
20110075451 | Power Semiconductor Module and Method for Operating a Power Semiconductor Module - A power semiconductor module is provided in which power semiconductor chips with an aluminum-based chip metallization and power semiconductor chips with a copper-based chip metallization are included in the same module, and operated at different barrier-layer temperatures during use. | 03-31-2011 |
20110103105 | POWER TRANSFORMER AND POWER CONVERTER INCORPORATING SAME - Embodiments of the present invention provide novel techniques for using multiple 18-pulse rectifier circuits in parallel. In particular, each rectifier circuit may include an autotransformer having 15 inductors coupled in series, joined by 15 nodes interposed between pairs of the inductors. The inductors may be represented as a hexagon in which alternating sides of the hexagon have two and three inductors, respectively. Each rectifier circuit may also include three inputs for three-phase AC power coupled to alternating vertices of the hexagonal representation and nine outputs for AC power coupled between each node that is not a vertex of the hexagonal representation and a respective diode bridge. Outputs of the diode bridges for the rectifier circuits may be coupled to a DC bus. In addition, a means for reducing circulating current between the parallel rectifier circuits and for promoting load sharing between the parallel rectifier circuits is also provided. | 05-05-2011 |
20110103106 | POWER CONVERSION DEVICE - In a power conversion device, reactors in an AC input filter absorbing a voltage at a carrier frequency of a PWM converter and reactors in an AC output filter absorbing a voltage at a carrier frequency of a PWM inverter include one six-leg six-phase iron core reactor. Accordingly, the device can be reduced in size when compared with a case where the reactors are composed of two four-leg six-phase iron core reactors. | 05-05-2011 |
20110122661 | DIRECT-TYPE CONVERTING APPARATUS AND METHOD FOR CONTROLLING THE SAME - An output voltage of a converter is given to a pair of DC power supply lines. Inverters are connected in parallel with each other between the DC power supply lines. When one inverter is operated based on a first zero vector and the other inverter is operated based on a second zero vector, a commutation is caused in the converter. The first zero vector and the second zero vector are different from each other. For example, all of high-arm side switching elements of the one inverter and low-arm side switching elements of the other inverter are rendered non-conducting, and all of side switching elements of the one inverter and high-arm side switching elements of the other inverter are rendered conducting. | 05-26-2011 |
20110134663 | POWER CONVERTER - A plurality of capacitors are interposed between ones of a plurality of input lines. The clamp capacitor is connected between two DC power supply lines. A current-source converter includes a plurality of switch devices, where x represents r, s and t. The switch device selects conduction/non-conduction through a first diode between corresponding one of the input lines and the first DC power supply line and conduction/non-conduction through a second diode between said corresponding one of input lines and the second DC power supply line based on external signals and brings corresponding one of the input lines with the first and second DC power supply lines in a state of not receiving the signals. | 06-09-2011 |
20110141774 | VARIABLE SPEED DRIVE - Systems and methods for improved VSDs are provided. One embodiment relates to an apparatus for common mode and differential mode filtering for motor or compressor bearing protection when operating with VSDs, including conducted EMI/RFI input power mains mitigation. Another embodiment relates to a method to extend the synchronous operation of an Active Converter to the AC mains voltage during complete line dropout. Another embodiment relates to an Active Converter-based Variable Speed Drive system with Improved Full Speed Efficiency. | 06-16-2011 |
20110157928 | DC-TO-AC CONVERTING CIRCUIT WITH WIDE INPUT VOLTAGE - A DC-to-AC converting circuit includes a transformer, a first modulation switching circuit, a second modulation switching circuit and a third modulation switching circuit, an inverter switching circuit and a controlling unit. Under control of the controlling unit, two of the first, second and third modulation switching circuits are selectively enabled according to the magnitude of the input voltage, so that electric energy of the input voltage is magnetically transmitted to the first primary winding, a second primary winding or a serially-connected winding assembly of the first primary winding and the second primary winding, and a turn ratio of the transformer is adjustable. | 06-30-2011 |
20110157929 | METHOD AND APPARATUS FOR ELECTRIC ISOLATION TRANSMISSION - A method and apparatus used for electric isolation transmission are provided. The method includes: providing an isolation transmission circuit having at least one capacitor; and implementing electric isolation between the primary side and secondary side, and suppressing leakage currents generated between the primary side and secondary side and transmitting power. The apparatus includes the isolation transmission circuit that is manufactured by capacitor(s). The apparatus can be applied to light-weight power sources providing AC/DC outputs with high efficiency, adapters, or related products. In addition, the apparatus has a reduced size and higher power transmission efficiency. | 06-30-2011 |
20110170321 | HF SURGICAL GENERATOR - A high-frequency surgical generator including a power supply for supplying rectified electrical energy, a power oscillator for supplying a potential-free, DC current-free and DC voltage-free high frequency voltage and a control device for controlling the high frequency voltage wherein the power supply is configured as a current source for supplying a load-independent output current, such that the load-independent output current of the power supply serves as the control variable for controlling the high-frequency voltage. The target value of the load-independent output current is pre-determined by the control device. The high-frequency surgical generators configured as such achieve improved modulation capability. | 07-14-2011 |
20110188272 | CIRCUIT FOR DIRECT ENERGY EXTRACTION FROM A CHARGED-PARTICLE BEAM - Provided herein is a fusion energy extraction circuit (FEEC) device having a grid-tied bidirectional converter and a resonant converter. The resonant converter can include an inverse cyclotron converter with two or more or quadruple plates and a plurality of circuit switches. The bidirectional converter can include a three-phase grid-tied converter. The FEEC device is capable of decelerating plasma particle beams, thereby extracting the energy from the deceleration, converting the extracted energy to electric energy, and sending the electric energy to a power grid. | 08-04-2011 |
20110194318 | ELECTRICAL POWER CONVERSION APPARATUS - An electrical conversion apparatus including a converter and an inverter comprises a capacitor that stores a DC electrical power; a ripple detection unit that detects a ripple of an RMS power that is generated from the inverter; a voltage measuring instrument that measures a voltage across the capacitor; a DC voltage command generation unit that calculates a command value of the voltage across the capacitor according to a frequency of the AC voltage generated from the inverter; and a DC voltage control unit that receives the voltage measured by the voltage measuring instrument and the command value calculated by the DC voltage command generation unit, to control the converter so that the voltage across the capacitor becomes the command value, wherein the DC voltage command generation unit makes the command value of the voltage across the capacitor higher than usual, in situations where the voltage across the capacitor is within a predetermined range including a frequency of a ripple component of the voltage across the capacitor. | 08-11-2011 |
20110205766 | Power Conditioning Unit - A power conditioning unit for delivering power from a power source to a mains utility supply, the power conditioning unit comprising a plurality of input terminals for connecting to the power source, a plurality of output terminals for connecting to the mains utility supply, a voltage increasing converter connected to the input terminals, a voltage reducing converter connected to the voltage increasing converter and a dc-to-ac converter connected to the voltage reducing converter and to the output terminals. | 08-25-2011 |
20110211374 | POWER SUPPLY DEVICE - The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A loss caused at the IGBT can be reduced to be small | 09-01-2011 |
20110222320 | POWER CONVERSION CONTROL WITH ENERGY STORAGE - A power generation system includes a renewable power source for producing source power; a source side converter for converting the source power to converted DC power; a source side controller for driving the converted DC power towards a maximum power point; a DC link for receiving the converted DC power; a grid side converter coupled to the DC link for converting DC link power from the DC link to AC output power for a grid; a grid side controller for controlling the AC output power of the grid side converter to achieve grid interconnection requirements; an electrical energy storage device; an energy storage converter coupling the energy storage device to the DC link; an energy storage controller for controlling the energy storage converter to achieve a desired power balance on the DC link. | 09-15-2011 |
20110228573 | POWER SUPPLY DEVICE - The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage (Vin) in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level. | 09-22-2011 |
20110261597 | INVERTER TYPE ENGINE GENERATOR - Generator output specifications according to destination are satisfied by an alternator with a single output band and a generator output voltage is made automatically adjustable in accordance with a load. An engine generator | 10-27-2011 |
20110267851 | CONVERTER CIRCUIT WITH ADJUSTABLE DC BUS VOLTAGE - A method for controlling voltage of a DC bus in a converter circuit is provided. The method includes monitoring a duty cycle of a switch that connects a resistive circuit across the DC bus, the switch being closed when the DC bus voltage reaches an upper voltage value and opened when the DC bus voltage reaches a lower voltage value and altering the lower voltage value based upon the duty cycle of the switch. | 11-03-2011 |
20110292695 | POWER CONVERTER SYSTEM AND METHOD - A three-phase power converter includes a converter configured to convert a three phase AC power input to a DC power output, the DC power output being provided to high and low sides of a DC bus, and an inverter coupled to the DC bus and configured to convert the DC power to a three phase AC output. The inverter comprises three legs and each leg comprises a pair of solid state switches and a respective output therebetween. The power converter further includes a common mode voltage control filter comprising three filter inputs and two filter outputs, each filter input coupled to an output of a respective leg of the inverter and each filter output coupled to a respective side of the DC bus. | 12-01-2011 |
20110292696 | VARIABLE FREQUENCY DRIVE AND METHODS FOR FILTER CAPACITOR FAULT DETECTION - Variable frequency motor drives and control techniques are presented in which filter capacitor faults are detected by measuring filter neutral node current and/or voltages and detecting changes in the fundamental frequency component of the measured neutral condition at the fundamental frequency of the input power and/or based on input current unbalance. | 12-01-2011 |
20110292697 | Power Transfer Devices, Methods, and Systems with Crowbar Switch Shunting Energy-Transfer Reactance - The present application discloses methods, circuits and systems for power conversion, using a universal multiport architecture. When a transient appears on the power input (which can be, for example, polyphase AC), the input and output switches are opened, and a crowbar switch shunts the inductance which is used for energy transfer. This prevents this inductance from creating an overvoltage when it is disconnected from outside lines. | 12-01-2011 |
20110299308 | COMMON MODE VOLTAGE REDUCTION APPARATUS AND METHOD FOR CURRENT SOURCE CONVERTER BASED DRIVE - Current source converter drives and common mode voltage reduction techniques are presented in which a space vector modulation zero vector for current source inverter (or rectifier) control is selected according to the switching state of the current source rectifier (or inverter) and according to the AC input power and the AC output power to control the output common mode voltage. | 12-08-2011 |
20110299309 | Ultra-High Efficiency Switching Power Inverter and Power Amplifier - An apparatus for providing a power output proportional to a source signal, including a phase modulator driving an upper and an lower power driver with carrier waveforms having a relative phase difference and having a signal modulated thereon, and coupled to a resonator circuit to operate as a substantially zero-voltage zero-current switching element, with the output fed into respective upper and lower transformers. Identical symmetrical secondary circuits on the transformers have a rectifier stage electrically connected to an inductor in series with an upper capacitor to form an upper low pass filter, and a high speed semiconductor switch coupled to a node between the inductor and rectifier stage provides a return path to ground. The lower secondary circuit inductor is highly coupled (>=0.99) to the upper inductor, and an output formed across the upper and lower output elements is isolated from rail voltage and balanced with bi-directional current. | 12-08-2011 |
20110310642 | LOW COST CURRENT SOURCE CONVERTERS FOR POWER GENERATION APPLICATION - A system comprising low cost topology for power converter systems is provided. The system takes advantage of the voltage-boost characteristic of a current source inverter (CSI) and utilizes a PWM CSI as a grid-side converter for power generation systems. Moreover, the generator-side converter employs low-cost devices, such as, but not limited to diode bridge, thyristor bridge, and/or a combination of diodes and thyristors, and accordingly simplifies generator-side converter and control. Further, the system provides a wider range of operation than traditional voltage source converter based topologies that utilize a voltage source inverter (VSI) as the grid-side convertor along with a diode rectifier as the generator-side converter. | 12-22-2011 |
20110310643 | POWER CONVERSION DEVICE - According to one embodiment, an electronic device includes a positive electrode, a negative electrode, a first terminal, a second terminal, a first plurality of switching elements and anti-parallel diodes coupled between the positive electrode and the first terminal and the second terminal, a second plurality of switching elements and anti-parallel diodes coupled between the negative electrode and the first terminal and the second terminal and a PiN diode coupled between the positive electrode and the negative electrode with reverse polarity. | 12-22-2011 |
20110317455 | LEAKAGE CURRENT REDUCTION APPARATUS - Three-phase windings | 12-29-2011 |
20120008348 | COMMUNICATION WITHIN A POWER INVERTER USING TRANSFORMER VOLTAGE FREQUENCY - A power inverter may include a transformer serving as an isolation barrier. The power inverter may include a first controller on one side of the isolation barrier. The first controller may encode the frequency of an input voltage of the transformer with one or more operating conditions of a direct current power supply electrically coupled to the inverter. As second controller on the other side of the isolation barrier may determine a frequency associated with an output voltage of the transformer. The second controller may decode the frequency associated with the output voltage of the transformer to determine the encoded operating conditions. | 01-12-2012 |
20120033464 | Universal Power Converter - Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which alternately connect an inductor and parallel capacitor between said portals, such that energy is transferred into the inductor from one or more input portals and/or phases, then the energy is transferred out of the inductor to one or more output portals and/or phases, with said parallel capacitor facilitating “soft” turn-off, and with any excess inductor energy being returned back to the input. Soft turn-on and reverse recovery is also facilitated. Said bi-directional switches allow for two power transfers per inductor/capacitor cycle, thereby maximizing inductor/capacitor utilization as well as providing for optimum converter operation with high input/output voltage ratios. Control means coordinate the switches to accomplish the desired power transfers. | 02-09-2012 |
20120057377 | UNINTERRUPTIBLE POWER SUPPLY WITH A DUAL GAIN VOLTAGE REGULATOR CONTROLLING AN INVERTER OUTPUT VOLTAGE BASED ON ACTIVE AND REACTIVE COMPONENTS OF CURRENT - An uninterruptible power supply (UPS) system has an inverter having an output coupled to a primary side of an output transformer. The UPS system has a controller having a dual gain voltage regulator for controlling the output voltage of the inverter of a UPS system that uses active and reactive current components of a load current flowing out an output of the UPS system. | 03-08-2012 |
20120057378 | STATIC CONVERSION METHOD AND SYSTEM FOR THE REGULATION OF POWER IN AN ALTERNATING CURRENT ELECTRICAL NETWORK - The method can be used for the regulation of power in an alternating current electrical network (ACNW; ACNW | 03-08-2012 |
20120063177 | Solar Photovoltaic Power Conditioning Units - We describe a photovoltaic power conditioning unit comprising: both dc and ac power inputs; a dc link; at least one dc-to-dc converter coupled between dc input and dc link; and a dc-to-ac converter coupled between dc link and ac output. The dc-to-dc converter comprises: a transformer having input and output windings; an input dc-to-ac converter coupled between dc input and input winding; and an ac-to-dc converter coupled between output winding the dc link. The output winding has a winding tap between the first and second portions. The ac-to-dc converter comprises: first and second rectifiers, each connected to a respective first and second portion of the output winding, to the dc link and winding tap; and a series inductor connected to the winding tap. Rectifiers are connected to the winding tap of the output winding via the series inductor wherein the series inductor is shared between the first and second rectifiers. | 03-15-2012 |
20120063178 | POWER CONVERTER - A converter includes switching devices connected between each of a plurality of input ends and a DC power supply line, and switching devices connected between each of the plurality of input ends and a DC power supply line. A capacitor, a resistor and a diode are connected in series with each other between the DC power supply lines. | 03-15-2012 |
20120075892 | DISCONTINUOUS PULSE WIDTH DRIVE MODULATION METHOD AND APPARATUS - Control systems, methods and power conversion systems are presented for reducing common mode voltages in AC motor loads driven by inverter PWM control using switching sequences with only active vectors where a first vector of each switching sequence differs by one phase switching state from a last vector of a switching sequence of an adjacent sector, along with enhanced deadtime compensation and reflected wave reduction techniques in providing pulse width modulated switching signals to a switching inverter. | 03-29-2012 |
20120075893 | INVERTER DEVICE OVERVOLTAGE PROTECTION METHOD - An inverter device overvoltage protection method that can appropriately protect an inverter device from an overvoltage condition is disclosed. When the DC voltage rises, and a DC voltage detection value exceeds a second DC voltage level, a protective circuit stops the inverter device by outputting an inhibit signal to a gate drive circuit, but it is assumed at this time that the rise of the DC voltage is temporary and no error output signal is output to the exterior of the inverter device. However, in the event that the DC voltage rises further while the inverter device is temporarily stopped, and the DC voltage detection value exceeds a first DC voltage level, it is determined that protection of the inverter device is necessary, and an error output signal is output to the exterior of the inverter device. | 03-29-2012 |
20120081933 | PHOTOVOLTAIC POWER CONDITIONING UNITS - We describe a photovoltaic (PV) panel power conditioning circuits, in particular for a PV panel with multiple sub-strings of connected solar cells. The power conditioning unit comprises a set of input power converters, one connected to each sub-string, a shared dc link to provide a common dc bus for the set of input power converters, and a common output power conversion stage coupled to the shared dc link to convert power from the shared dc link to ac power for a mains power supply output from the power conditioning unit. Local conversion of the sub-strings facilitates control of the power available from the panel and optimum energy harvesting, as well as local maximum power point tracking (MPPT) adjustment. | 04-05-2012 |
20120081934 | PHOTOVOLTAIC POWER CONDITIONING UNITS - We describe a photovoltaic (PV) panel system comprising a PV panel with multiple sub-strings of connected solar cells in combination with a power conditioning unit (microinverter). The power conditioning unit comprises a set of input power converters, one connected to each sub-string, and a common output power conversion stage, to provide power to an ac mains power supply output. Integration of the micro-inverter into the solar PV module in this way provides many advantages, including greater efficiency and reliability. Additionally, embodiments of the invention avoid the need for bypass diodes, a component with a high failure rate in PV panels, providing lower power loss and higher reliability. | 04-05-2012 |
20120087157 | DC-TO-AC POWER INVERTING APPARATUS FOR PHOTOVOLTAIC MODULES - The disclosure provides a DC-to-AC power inverting apparatus for photovoltaic modules, which comprises two stages: a first stage including a resonant circuit in series, an isolating transformer with three windings, a full-bridge DC-to-AC converting unit operating in a high-frequency switch mode so as to reduce the transformer volume, and a full-wave rectifier; while a second stage including a half-bridge single-phase inverter unit with two active switches. In the first stage, any high-frequency AC signal produced from the primary winding of the isolating transformer is converter into a DC signal by the full-wave rectifier at the secondary winding of the isolation transformer. Moreover, the switching of the two active switches in the second stage is controlled to operate in a low-frequency mode using a switching frequency synchronized with the frequency of the public electrical supply to control the AC output, and thus to reduce the switching loss of the active switches. | 04-12-2012 |
20120087158 | Method and Apparatus for Controlling an Inverter Using Pulse Mode Control - A method and apparatus for controlling an inverter includes operating the inverter in a one of a normal run mode or a pulse mode depending on one or more criteria. When operating in the pulse mode, the inverter generates a sinusoidal output pulse waveform including a plurality of pulses having a determined pulse width. The pulse width is less than a half-wave period of a full-cycle sinusoidal waveform and may be determined as function of, for example, the output power of the inverter, a grid voltage, and/or other criteria. | 04-12-2012 |
20120092905 | METHOD AND SYSTEMS FOR CONVERTING POWER - A power conversion system includes a first converter coupled to a power source, wherein the first converter includes an input side, and an output side electrically isolated from the input side. The power conversion system also includes a second converter coupled to the power source, wherein the second converter includes an input side, and an output side electrically isolated from the input side. The second converter input side is coupled in parallel with the first converter input side, and the second converter output side is coupled in series with the first converter output side. The power conversion system also includes an inverter coupled to the first converter output side and to the second converter output side, and the inverter supplies alternating current to an electrical distribution network. | 04-19-2012 |
20120099347 | FREQUENCY CONVERTER ASSEMBLY - A frequency converter assembly including an input for supplying electric power having an input frequency into the frequency converter assembly from a supply network, a direct voltage intermediate circuit having capacitor component, and at least one controllable switch. The switch being electrically positioned between the input and the direct voltage intermediate circuit. The assembly also includes an output for supplying electric power having an output frequency from the frequency converter assembly, and control component arranged to control the at least one controllable switch. The control component provides a recovery function to recover the capacitor component by supplying restricted recovery current from the supply network to the capacitor component through the at least one controllable switch, the control means also prevents supply of electric power from the direct voltage intermediate circuit towards the output during the recovery function. | 04-26-2012 |
20120099348 | POWER CONVERTER WITH HIGH EFFICIENCY IN OPERATION - A power converter includes a main switch to which a capacitor is connected through a sub-diode. A primary coil of a transformer and a sub-switch are joined parallel to the capacitor. A main diode is coupled in series with the main switch. A sub-diode and a secondary coil of the transformer are connected parallel to the main diode. The rate of a rise in voltage across the main switch when turned off is suppressed by the rate of charging of the capacitor. Subsequently, by turning on the sub-switch, the current flowing through the main diode to be delivered to the transformer, thereby causing the current flowing through the main switch when turned on to be decreased by the sub-inductor. | 04-26-2012 |
20120106210 | MULTI-PHASE POWER CONVERTERS AND INTEGRATED CHOKE THERFOR - Power conversion systems and integrated multi-phase chokes providing high common mode to differential mode choke inductance ratios with circular and triangular shapes for concurrent differential filtering and common-mode voltage blocking in motor drives and other power conversion applications. | 05-03-2012 |
20120113692 | CASCADE POWER SYSTEM ARCHITECTURE - A cascade power system comprises a non-isolated converter in a cascade configuration with an isolated converter and a controller that is coupled with the output of the isolated converter and the switching element of the non-isolated converter. The non-isolated converter steps-down the input voltage to a lower regulated voltage. The isolated converter converts the regulated voltage to a square wave signal that is output to a transformer and the controller. Thus, a the resulting feedback loop comprising the isolated converter, controller and non-isolated converter is completely independent from the output of the system. As a result, a feedback relation can be derived in the form of a feedback algorithm that can effectively regulate/adjust the output of the non-isolated converter and therefore the isolated converter output as well. Further, because the non-isolated converter steps down the voltage and the isolated converter operates on this low stepped down voltage, the system is able to be highly efficient. | 05-10-2012 |
20120113693 | POWER CONVERTER CIRCUIT - A power converter circuit includes a diode group, a relay, a DC section and an inverter. The diode group includes a plurality of diodes arranged to rectify an output voltage of an alternating-current power supply. The relay is provided at a point located closer to the alternating-current power supply than the diode group. The DC section is where an output voltage of the diode group is applied. The inverter is arranged to output a three-phase alternating-electric current to a three-phase load. The DC section has a maximum pulse voltage twice as great as a minimum pulse voltage of the DC section. The DC section includes an energy-absorbing circuit having an electrolytic capacitor. The DC section further has a pathway arranged to apply the output voltage of the alternating-current power supply from the alternating-current power supply to the electrolytic capacitor via a rectifying circuit, not via the relay. | 05-10-2012 |
20120127764 | Power Systems for Photovoltaic and DC Input Sources - A power conversion system for use with a photovoltaic (PV) power source may include a DC/DC converter for converting a first DC voltage into a second DC voltage, an isolation transformer, an inverter for converting DC power to AC power, and at least one controller for controlling the DC/DC converter and the inverter. The controller may be configured to operate the DC/DC converter as a buck converter or a boost converter based, at least in part, on whether the first DC voltage is less or greater than a reference voltage. Additionally, the controller may operate the converter according to a maximum power point tracking algorithm. Further, the controller may be configured to operate the inverter to control the DC voltage at the inverter's input as a function of the AC voltage at the inverter's output. Example embodiments of power systems, DC/DC converters, DC/AC inverters and related methods are also disclosed. | 05-24-2012 |
20120134183 | POWER CONVERTER WITH A CONTROLLED CURRENT SOURCE AND CONNECTED IN SINGLE-PHASE MODE - The invention relates to a control method implemented in a power converter, such as, for example, a variable speed drive. This control method is designed to make the power converter operate when the latter is connected to the network in single-phase mode. The power converter notably includes a controlled current source connected in series to its DC power supply bus. This controlled current source includes an electronic converter ( | 05-31-2012 |
20120134184 | MULTI-LEVEL INVERTER HAVING DUAL CONTROLLER - The present disclosure relates to a multi-level inverter having a plurality of single inverter modules, the multi-level inverter including: a first controller providing a control signal to the multi-level inverter in response to voltage and frequency command based on detection of current and rotation speed of a motor; a second controller providing a control signal to the multi-level inverter in response to voltage and frequency command based on detection of current and rotation speed of a motor; and a plurality of single inverter modules converting an inputted AC power to DC power in response to the control signal from the first controller or the second controller, smoothing the converted DC power, converting the smoothed DC power to a three phase current in response to the control signal and outputting the three phase current. | 05-31-2012 |
20120140532 | PULSE WIDTH MODULATION CONTROL METHOD AND SYSTEM FOR MITIGATING REFLECTED WAVE EFFECTS IN OVER-MODULATION REGION - Power conversion systems and methods are provided for operating a multi-phase inverter to drive a load while mitigating reflected waves, in which one or more PWM modulating signals are selectively adjusted if at least one of the phase signals or values is transitioning into or out of an over-modulation range outside a pulse width modulation carrier waveform range. | 06-07-2012 |
20120140533 | SOLAR PHOTOVOLTAIC SYSTEM WITH CAPACITANCE-CONVERTIBNG FUNCTION - A solar photovoltaic system with a capacitance-converting function provides a DC power source through a solar cell, and the DC power source is converted into an AC power source, thus performing a grid-connected operation with a utility power. The solar photovoltaic system further includes a capacitance conversion apparatus, a DC-to-DC converter, a DC-to-AC converter, and a filter circuit. In addition, the capacitance conversion apparatus has an inductor, a first power switch component, a second power switch component, and a capacitor, which are electrically connected to each other. Instead of the conventional electrolytic capacitor, the capacitor conversion apparatus is used to provide energy-storing, energy-releasing, and filtering functions, thus increasing the operation life of the solar | 06-07-2012 |
20120147633 | AC-to-AC converter and method for converting a first frequency AC-voltage to a second frequency AC-voltage - An AC-to-AC-converter for converting a first frequency AC-voltage to a second frequency AC-voltage is disclosed. The converter includes: a first converter section which includes a first input terminal, a second input terminal, a first DC-output node, and a second DC-output node; a second converter section which includes a first DC-input node connected to the first DC-output node, a second DC-input node connected to the second DC-output node, and at least two second output terminals; a DC-link overvoltage clamp which is coupled between the first DC-output node and the second DC-output node; and a capacitor system. The first converter section, the second converter section, the DC-link overvoltage clamp, and the capacitor system are integrated into one assembly. | 06-14-2012 |
20120147634 | CIRCUIT AND METHOD FOR REGULATING A DC VOLTAGE AND POWER CONVERTER - A circuit for regulating a DC voltage is provided. The circuit includes: a controllable switch system, a resistor, a first control circuit and a second control circuit. The controllable switch system includes a first terminal, a second terminal, a first control terminal, and a second control terminal. The controllable switch system is configured to establish an electrical connection between the first terminal and the second terminal, if a first control signal applied to the first control terminal satisfies a first criterion or if a second control signal applied to the second control terminal satisfies a second criterion; A A method for regulating a DC voltage and an AC-to-AC-converter are described. | 06-14-2012 |
20120163044 | MULTILEVEL POWER CONVERTER OR INVERTER ARRANGEMENT USING H BRIDGES - Multilevel voltage arrangement having a transformer and a power converter or inverter comprising one or more common DC links connectable to a power source, said arrangement comprising one first set of H bridges being connected to said common DC link, wherein each of said H bridges comprises with at least two nodes connected to the ends of wirings at the primary side of a transfer, wherein control means are configured for controlling H bridges so as to achieve a multilevel voltage signal between the first node and the second node of said H bridges. | 06-28-2012 |
20120163045 | POWER CONVERTER AND METHOD FOR CONTROLLING SAME - A converter section ( | 06-28-2012 |
20120163046 | PHASE CURRENT DETECTION DEVICE AND POWER CONVERSION DEVICE USING THE SAME - A control section which repeats inverter control in units of an inverter control period having a predetermined length is provided. In the control section, a phase current detection period in which a phase current is detected is provided between predetermined two inverter control periods, each of switching states of switching elements of a inverter circuit is controlled so that a voltage pulse having a larger width than a width of a voltage pulse in the inverter control period is output from a shunt resistor in the phase current detection period. | 06-28-2012 |
20120182770 | POWER CONVERTER - The power converter includes a diode rectifier which rectifies alternating current power output from an alternating current power supply, a reactor provided between the alternating current power supply and the diode rectifier, an inverter circuit to which power output from the diode rectifier is directly supplied, and a capacitor provided between power supply lines on a primary side of the diode rectifier. | 07-19-2012 |
20120188803 | CONVERTER WITH REACTIVE POWER COMPENSATION - A voltage source converter for a HVDC power transmission system is disclosed. According to one aspect, the voltage source converter includes at least one phase element having series connected diodes configured to interconnect, in use, a DC network and an AC network. The voltage source converter further includes at least one auxiliary converter configured to act as a waveform synthesizer to modify the DC voltage presented to the DC side of one or more phase elements. | 07-26-2012 |
20120201056 | POWER CONVERTER WITH COMMON MODE VOLTAGE REDUCTION - Power conversion systems are presented with common mode reduction by space vector pulse width modulation zero vector selection to counteract common mode contribution of active vectors. | 08-09-2012 |
20120212982 | CMV REDUCTION UNDER BUS TRANSIENT CONDITION - Power conversion systems and control techniques are presented in which a bus transient control component bypasses selected phases of a rectifier during a protective mode of operation to reduce common mode voltages or currents. | 08-23-2012 |
20120212983 | METHOD FOR CONVERTING POWER FOR A HIGH-VOLTAGE DIRECT VOLTAGE CONNECTION - A method for converting a multi-phase alternating voltage into a high-voltage direct voltage and then into a second multi-phase alternating voltage. The method utilizes first and second cascades of power converter cells, with each individual cell having respective first and second current valves. The method includes offsetting the clocking of individual power converter cells by a predetermined factor; cyclically switching off the first current valves in counterpoint with the second current valves, so that only one set of current valves are “on” at any given time while the other set of current valves is “off” at that time; and, in response to a signal indicating that an individual power cell is malfunctioning, shunting out the individual malfunctioning power cell. | 08-23-2012 |
20120218789 | Electrical Power Conditioner - This invention presents an electrical power conditioner in the form of an electrical drive system for a machine, motor or generator. The electrical drive system has both variable frequency and fixed frequency modes. The electrical drive system includes power conditioners of less than full capacity for the variable frequency mode and a direct connection switch of full capacity for the fixed frequency mode. The electrical drive system is capable of supplying or receiving power from a variable speed electrical machine. The electrical drive system is particularly useful for wind turbines. | 08-30-2012 |
20120230066 | PHOTOVOLTAIC POWERED SYSTEM - A photovoltaic powered system and an alternating current (AC) module thereof are disclosed. The photovoltaic powered system provides a direct current (DC) power through a photovoltaic module and converts the DC power into an AC power, which is grid-connected to an AC utility power. The AC module of the photovoltaic powered system produces a continuous quasi-sinusoidal current and the quasi-sinusoidal current is converted into a sinusoidal current. The high-frequency harmonic components of the sinusoidal current are filtered to produce a sinusoidal output current in phase with the AC utility power, thus realizing the maximum power point tracking (MPPT) of the photovoltaic module and feeding unity-power-factor power into the AC utility power. | 09-13-2012 |
20120230067 | POWER CONVERTER - This current converter is formed to short-circuit input-side terminals of a plurality of power conversion portions, to parallelly connect output-side terminals of the plurality of power conversion portions with each other and to couple inductors provided on the plurality of power conversion portions respectively with each other, to be capable of performing an operation of moving currents between windings of the coupled inductors on the basis of ON-/OFF-states of pluralities of one-way switches. | 09-13-2012 |
20120250372 | GRID TIED INVERTER, SYSTEM AND METHOD - A grid tied inverter comprising an unfolding circuit connectable to an electricity grid; and a DC to DC current fed converter operable to generate a current waveform from a battery, the current waveform being substantially synchronised to the electricity grid, wherein the unfolding circuit is operable, in a first mode, to convert the current into a sinusoidal waveform have an instantaneous voltage suitable for injection onto the grid. | 10-04-2012 |
20120250373 | GRID TIED INVERTER, SYSTEM AND METHOD - A grid tied inverter connectable to an electricity grid having a DC to DC current fed push-pull inverter to generate a current waveform from a DC voltage source. The push-pull inverter includes a transformer having a first side winding connectable to a battery and a second side winding connectable to the grid. The first end of the second side winding is connected between two diodes connected in series between a positive and negative output rail and being oriented in the same direction. The second end of the second side winding is connected between two capacitors connected in series between the positive and negative output rail. A further winding is connected at one end between the two capacitors and at its other end between another two diodes connected in series between the positive and negative output rail. | 10-04-2012 |
20120250374 | GRID TIED INVERTER, SYSTEM AND METHOD - A grid tied inverter connectable to an electricity grid, the grid tied inverter comprising a DC to DC current fed push-pull converter operable to generate a current waveform from a DC voltage source, the current waveform being substantially synchronised to the electricity grid, and a transformer having a first side connected to the DC to DC current fed converter and a second side having an output line connectable to the grid. | 10-04-2012 |
20120250375 | POWER CONVERTER - A power supply unit has one end on the low potential side, said end being connected to a switching element on the power supply line side, and serves as an operation power supply for outputting a switch signal to the switching element. A switching element includes a first and a second electrode, and renders an electric current in only a direction from the second electrode to the first electrode conducting. A diode is connected in parallel to the switching element while the cathode thereof is directed to a power supply line. A capacitor has one end connected to the first electrode of the switching element and the other end connected to the other end of the power supply unit, and serves as an operation power supply for outputting a switch signal to the switching element. | 10-04-2012 |
20120257425 | POWER CONVERTER - A power supplying section is an operation power supply for a switching element for an inverter, and one end on a low potential side is connected to one end of the switching element on a DC power supply line side. A boot capacitor is connected to one end of the switching element on a DC power supply line side, where the other end is electrically connected to one end of the power supply section on the high potential side. A diode is provided in a path extending from one end of the power supply section on the high potential side to the DC power supply line via the boot capacitor. The diode makes only the current, which is flowing from the power supply section to the boot capacitor, flow. | 10-11-2012 |
20120294049 | PARALLEL RUNNING CONTROL APPARATUS FOR INVERTER GENERATORS - In a parallel running control apparatus for an inverter generator A having a first, second and third inverters each connected to three windings wound around an alternator driven by an engine and converts alternating current outputted therefrom to direct/alternating current to output alternating current, and first, second and third controllers to control turning ON/OFF of the switching elements, and the inverter generator A is configured to run in parallel with at least one inverter generator B which is configured to be same as the inverter generator A to output a three-phase alternating current. | 11-22-2012 |
20120294050 | INVERTER GENERATOR - In an inverter generator having a first, second and third inverters, a first, second and third controllers adapted to control turning ON/OFF of switching elements thereof and to operate the first inverter as a master inverter and the second and third inverters as slave inverters, a three-phase output terminal, a single-phase output terminal, and an engine control section adapted to send an output of a selector switch to the first controller and so on, thereby outputting three-phase or single-phase AC through control of turning ON/OFF of the switching elements, so that the outputs from the first, second and third inverters become in the three-phase or single-phase AC in response to the output of the selector switch making the output from the first inverter as a reference. | 11-22-2012 |
20120300511 | AC CONVERTER, AC CONVERTING METHOD, AND STORAGE MEDIUM - An AC converter includes: a switching section | 11-29-2012 |
20120307532 | SEMICONDUCTOR DEVICE - A semiconductor device includes: a parallel connection structure | 12-06-2012 |
20120314460 | HIGH YIELD AC-AC POWER CONVERTER AND METHOD THEREFOR - An AC to AC power converter has a rectifier configured to receive an AC signal. An H-Bridge is coupled to the rectifier and the DC Filter. A processor is coupled to the rectifier and to the H-Bridge, wherein the processor is configured to produce a pulse to modulate a rectified input or a constant DC input to the H-Bridge. A wave filter is coupled to the H-Bridge and configured to modulate an output of the H-Bridge to an AC voltage of a desired frequency, wherein an output of the wave filter is coupled to the processor. | 12-13-2012 |
20120320641 | POWER CONVERTER BUS CONTROL - Processes, machines, and articles of manufacture that may management power conversion as provided. This may include circuit topology or management that serves to improve power conversion efficiency from a DC waveform to an AC waveform. This circuit topology or management may include considering and managing the voltage across a DC-link capacitive bus and the phase angle output of an AC waveform in order to influence or improve power conversion characteristics or efficiency. | 12-20-2012 |
20120320642 | COMPOUND SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME - A compound semiconductor device includes a substrate; and a compound semiconductor multilayer structure which is formed above the substrate and which contains compound semiconductors containing Group III elements, wherein the compound semiconductor multilayer structure has a thickness of 10 μm or less and a percentage of aluminum atoms is 50% or more of the number of atoms of the Group III elements. | 12-20-2012 |
20120327694 | POWER CONVERTER - A switching element connects/disconnects an input end to/from at least either of power supply lines. A switching element is provided between the power supply lines. One end on the low potential side of a power supply unit is connected to the switching element on the side of either of the power supply lines. One end of a capacitor is connected between the switching element and the input end. The other end of the capacitor is connected to one end on the high potential side of the power supply unit. The capacitor and the power supply unit respectively serve as operation power supplies for outputting switch signals to the switching elements. A voltage adjustment unit maintains voltage across both ends of the capacitor. | 12-27-2012 |
20130010505 | METHOD FOR CONTROLLING A POWER CONVERTER IN A WIND TURBINE GENERATOR - A method for controlling a power converter in a wind turbine generator, the power converter being connected to a power grid, the method comprising obtaining an alternating current (AC) line voltage at a connection point between the power converter and the power grid, obtaining a frequency of the power grid based on the AC line voltage, dynamically adapting the AC line voltage to the frequency of the power grid, generating a reference signal based on at least the frequency-adapted AC line voltage, and determining a converter control signal to be provided to the power converter based on the reference signal and the grid frequency in order to generate a power at the frequency of the power grid. Further, a wind turbine generator implementing the method is provided. | 01-10-2013 |
20130010506 | LEAKAGE CURRENT REDUCING APPARATUS - First windings of a first common mode transformer and second windings of a second common mode transformer are connected in series via connection lines. The windings are connected to an AC power supply via connection lines. The first windings are connected to a three-phase motor via connection lines, a converter, and an inverter. High-frequency leakage currents flowing in the connection lines are detected as a common mode voltage by a winding for common mode voltage detection. An output voltage is inputted via a filter to a voltage amplifier unit that amplifies the output voltage, and the amplified voltage is applied to a winding via a capacitor in substantially a same direction as a direction of the common mode voltage. As a result, leakage currents are reduced by induced voltages on the windings. | 01-10-2013 |
20130016538 | AC/DC CONVERTER DEVICEAANM Fujita; TakayukiAACI ShigaAACO JPAAGP Fujita; Takayuki Shiga JP - A command value is a current command value with a triangular-like waveform having a cycle that is ⅓ of a cycle of a three-phase voltage. A carrier has a triangular-like waveform having a cycle shorter than the cycle of the command value. Comparison result signals are pulse signals indicating a result of the comparison between the carrier and the command value. In a region of a phase of 30 to 90 degrees, a portion of the comparison result signal present in this region is employed as a gate signal. In a region of a phase of 270 to 330 degrees, a portion of the comparison result signal present in this region is employed as the gate signal. | 01-17-2013 |
20130033907 | ADAPTIVE HARMONIC REDUCTION APPARATUS AND METHODS - Power conversion systems with active front end converters for example motor drives and power generation systems for distributed energy sources are presented with adaptive harmonic minimization for grid-tie converters for minimized or reduced total harmonic distortion in the line current spectrum including the source harmonic current, the load harmonics and the PWM harmonics. | 02-07-2013 |
20130063988 | POWER CONVERSION WITH ADDED PSEUDO-PHASE - Methods and systems for power conversion. An energy storage capacitor is contained within an H-bridge subcircuit which allows the capacitor to be connected to the link inductor of a Universal Power Converter with reversible polarity. This provides a “pseudo-phase” drive capability which expands the capabilities of the converter to compensate for zero-crossings in a single-phase power supply. | 03-14-2013 |
20130083567 | COMPOUND SEMICONDUCTOR DEVICE AND METHOD FOR FABRICATING THE SAME - A compound semiconductor device includes an electron transit layer having a first polarity, a p-type cap layer which is formed above the electron transit layer and has a second polarity, and an n-type cap layer which is formed on the p-type cap layer and has the first polarity. The n-type cap layer includes portions having different thicknesses. | 04-04-2013 |
20130083568 | COMPOUND SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREFOR - An HEMT includes, on an SiC substrate, a compound semiconductor layer, a silicon nitride (SiN) protective film having an opening and covering the compound semiconductor layer, and a gate electrode formed on the compound semiconductor layer so as to plug the opening. In the protective film, a projecting portion projecting from a side surface of the opening is formed at a lower layer portion | 04-04-2013 |
20130083569 | MANUFACTURING METHOD OF COMPOUND SEMICONDUCTOR DEVICE - A passivation film is formed on a compound semiconductor layered structure, an electrode formation scheduled position for the passivation film is thinned by dry etching, a thinned portion of the passivation film is penetrated by wet etching to form an opening, and a gate electrode is formed on the passivation film so as to embed this opening by an electrode material. | 04-04-2013 |
20130083570 | SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME - A semiconductor device includes a first element structure that includes a charge supply layer of first polarity; a charge channel layer of second polarity, the charge channel layer being formed above the charge supply layer and including a recess portion; and a first electrode formed in the recess portion above the charge channel layer. | 04-04-2013 |
20130100716 | HIGH-POWER MEDIUM-VOLTAGE DRIVE POWER CELL - The present invention provides a high-power medium-voltage drive power cell, which comprises: a rectifier module for rectifying the three-phase AC input voltage to get a DC voltage; an IGBT (Insulated Gate Bipolar Transistor) inverter bridge connected to capacitors for converting the DC voltage into an AC voltage of which the frequency, the amplitude and the phase are adjustable; a bypass module connected to the IGBT inverter bridge for providing the bypass function when the IGBT inverter bridge works in an abnormal state; and a heat pipe heat sink having a base plate on both sides of which power elements of the high-power medium-voltage drive power cell are disposed. | 04-25-2013 |
20130100717 | DC-AC POWER CONVERTING APPARATUS AND SOLAR POWER SUPPLYING APPARATUS INCLUDING THE SAME - There is provided a DC-AC power converting apparatus that does not employ a capacitor for removing a ripple in an input terminal by charging or supplementing power according to a difference in power levels between power output by a solar cell and system instantaneous power or employs a capacitor having a low capacity, and a solar power supplying apparatus including the same. The DC-AC power converting apparatus includes: a DC-AC power converting unit that switches DC power and converts the DC power into AC power; and a charging and discharging unit that charges surplus power generated in a switching operation when a power level of the DC power is higher than a power level of the AC power and discharges the charged power through the switching operation when the power level of the DC power is lower than the power level of the AC power | 04-25-2013 |
20130107587 | PHOTOVOLTAIC ARRAY EMULATORS | 05-02-2013 |
20130107588 | SERIES-CONNECTED MULTI-LEVEL POWER CONVERSION DEVICE | 05-02-2013 |
20130114311 | Power Transfer Devices, Methods, and Systems with Crowbar Switch Shunting Energy-Transfer Reactance - The present application discloses methods, circuits and systems for power conversion, using a universal multiport architecture. When a transient appears on the power input (which can be, for example, polyphase AC), the input and output switches are opened, and a crowbar switch shunts the inductance which is used for energy transfer. This prevents this inductance from creating an overvoltage when it is disconnected from outside lines. | 05-09-2013 |
20130114312 | System and Method for Power Conversion for Renewable Energy Sources - An energy conversion system for use with an alternative energy source is disclosed. The alternative energy source can generate either an AC or a DC voltage. A first power converter is connected between the source and a DC bus, and a second power converter is connected between the DC bus and the grid or another load. The first power converter is configured to operate during periods of low energy generation. The energy captured will be stored in an electrical storage medium. When sufficient energy is stored, this energy is subsequently transferred to the grid or load via the second power converter. The second power converter is configured to operate intermittently during periods of low power generation, transferring energy from the DC bus when sufficient energy is stored and turning off when the stored energy drops to a point at which the second power converter can no longer be operated efficiently. | 05-09-2013 |
20130121041 | POWER CONVERTER BASED ON H-BRIDGES - A power converter includes an active front end (AFE) that is coupled by a dc link stage to a plurality of H-bridge inverters. One or more multi-phase electro-magnetic energy conversion devices, such as transformers or electric machines, with open windings that are connected to only the AFE or only the H-bridge inverters or to both the AFE and H-bridge inverters, provide a regenerative or partial regenerative power converter. | 05-16-2013 |
20130121042 | CASCADED H-BRIDGE MEDIUM VOLTAGE DRIVE, POWER CELL AND BYPASS MODULE THEREOF - The present application relates to a cascaded H-Bridge medium voltage drive, a power cell, and a bypass module thereof, wherein the bypass module is configured for bypassing a major circuit module of the power cell, while the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter being configured as a first output end and a second output end; a bypass circuit comprises a first bridge arm and a second bridge arm; a point led from the first bridge arm is configured as a first input end of the bypass circuit, a point led from the second bridge arm is configured as a second input end of the bypass circuit, and the first input end is electrically connected with the first output end, the second input end is electrically connected with the second output end. | 05-16-2013 |
20130128632 | NEUTRAL POINT CLAMPED CONVERTER CONTROL SYSTEM AND CONTROL METHOD AND COMPENSATION UNIT - A control system includes a fundamental control unit, first and second compensation control units, a switch control unit, and a switch implementation unit. The fundamental control unit generates fundamental commands to implement fundamental power conversion operation for a converter. The first compensation control unit generates a first compensation signal for injection into the fundamental command to balance neutral point voltage when the converter is in operation in a first state. The second compensation control unit generates a second compensation signal for injection into the fundamental command to balance neutral point voltage when the converter is in operation in a second state. The switch control unit detects first and second states of the converter and provides first and second switch signals respectively. The switch implementation unit switches the fundamental control unit to communicate with the first and second compensation control units according to the first and second switch signals respectively. | 05-23-2013 |
20130128633 | CHOPPER APPARATUS - Positive-side DC terminals P | 05-23-2013 |
20130148389 | POWER CONVERSION DEVICE - A light-emitting diode that is connected to be in a forward direction on a current path from a power potential side toward a signal output terminal side via a unidirectional photocoupler, at the time of being switched to a sink format; and a light-emitting diode that is connected to be in a forward direction on a current path from the signal output terminal side toward a common potential side via the unidirectional photocoupler, at the time of being switched to a source format are provided. | 06-13-2013 |
20130155729 | SYSTEM AND METHOD FOR DETECTING PHASE LOSS AND DIAGNOSING DC LINK CAPACITOR HEALTH IN AN ADJUSTABLE SPEED DRIVE - A system and method for detecting input phase loss in an adjustable speed drive (ASD) includes an input unit to detect operating data from the ASD. The operating data includes a DC link current of the ASD. The system also includes a state observer that is adapted to receive the operating data from the input unit and extract a DC link capacitor current of the ASD using the DC link current. The system also includes a controller programmed to compare the extracted DC link capacitor current to a predetermined fault range and generate a fault indication of an input phase loss if the extracted DC link capacitor current is within the predefined fault range. The controller is also programmed to calculate an estimated lifespan of the DC link capacitor based on the extracted DC link capacitor current. | 06-20-2013 |
20130155730 | SYSTEM AND METHOD FOR LOW SPEED CONTROL OF POLYPHASE AC MACHINE - A power converter configured to improve power capture in a wind turbine during low wind speed operation is disclosed. The power converter converts the power generated by the alternator of the wind turbine into a suitable AC current for delivery to a utility grid or to an electric load independent of the utility grid. The power converter is configured to operate in multiple operating modes, utilizing both synchronous and non-synchronous control methods, to extend the operating range of the power converter. During non-synchronous operation, the power converter utilizes a modulation routine that may either vary the dead-time compensation period during a constant modulation period or vary the modulation period with a constant on-time. A seamless transfer between non-synchronous and synchronous control methods with low total harmonic distortion (THD) improves the range of power generation for wind generators. | 06-20-2013 |
20130155731 | SYSTEM AND METHOD FOR LOW SPEED CONTROL OF POLYPHASE AC MACHINE - A method of starting a wind turbine generator of any type of polyphase AC machine, including, but not limited to, brushless DC or permanent magnet machines is disclosed. The machine starts from a dead stop or from low speed operation and is accelerated to the cut in speed for power production. The start-up is realized utilizing the common set of electrical conductors and the power converter also used for capturing the generated power. Under initial operation, the power converter executes a PWM modulation technique to drive the machine. Periodically, the PWM modulation is stopped to read the electrical position of the generator. | 06-20-2013 |
20130163293 | BUCK CIRCUIT - A buck circuit of a computer includes a voltage input terminal, a voltage output terminal, first and second electronic switches, and first to third field effect transistors (FETs). When the computer is powered on, the signal control terminal of the computer outputs a first control signal to control the first FET to be turned on through the first and second electronic switches, and simultaneously controls the first and third FETs with a pulse width modulation (PWM) control chip. After the computer is powered off, the signal control terminal of the computer outputs a second control signal to control the first FET to be turned off through the first and second electronic switches, and to control the third FET through the PWM control chip. | 06-27-2013 |
20130163294 | INVERTER APPARATUS HAVING POWER SUPPLY CIRCUIT - An inverter apparatus having a power supply circuit includes a converter circuit for rectifying AC power into DC power, a smoothening circuit for smoothening the rectified DC power, an inverter circuit for converting the smoothened DC into AC at a variable frequency through a plurality of switches to control a load, and a current detection circuit for detecting overcurrent from the smoothened DC supplied from the inverter circuit, wherein the inverter circuit applies bootstrap power for driving the switches to the current detection circuit to use the bootstrap power as power of the current detection circuit. When bootstrap power for driving switch gates is used, it is possible to use the bootstrap power as the power of the current detection circuit by adding the auxiliary circuit composed of a small number of passive elements. | 06-27-2013 |
20130170256 | CONTROL APPARATUS FOR REGENERATIVE MEDIUM VOLTAGE INVERTER - A control apparatus for regenerative medium voltage inverter is disclosed. The control apparatus controls a switching of a PWM converter unit by generating a voltage compensating a power difference between an input and an output of the PWM converter unit. | 07-04-2013 |
20130176753 | Three Phase Active Rectifier System - A voltage source inverter comprises a rectifier converting AC power to DC power at an output. An inverter receives DC power and converts the DC power to AC power. A link circuit is connected between the rectifier circuit and the inverter circuit and comprises a DC bus. A DC bus capacitor across the DC bus smoothes voltage ripple. An active filter circuit comprises a pair of filter capacitors in series across the first and second rails to create a midpoint. Bidirectional switches are connected between the rectifier input and the midpoint. A current sensor is connected between the bidirectional switches and the midpoint. An active switch controller controls a conduction angle of the bidirectional switches to maintain DC bus voltage at a desired reference level under a wide load range. | 07-11-2013 |
20130176754 | FILTERING REACTOR STAGE AND VARIABLE-FREQUENCY DRIVING SYSTEM UTILIZING THE SAME - A filtering reactor stage and a variable-frequency driving system utilizing the same are provided. The system includes a rectifier input stage, an inverter output stage and a filter reactor stage. The filter reactor stage is coupled between the rectifier input stage and the inverter output stage. The filter reactor stage includes a magnetic core module, a first winding set, a second winding set and a third winding set. The magnetic core module includes a middle pillar and two side pillars. The first second winding sets are wound around two side pillars respectively. The first winding second winding sets are coupled to a first DC (Direct Current) bridge between the rectifier input stage and the inverter output stage. The third winding set is wound around the middle pillar and coupled to a second DC bridge between the rectifier input stage and the inverter output stage. | 07-11-2013 |
20130182468 | WIND POWER CONVERTER - A wind power converter comprises a multiple of phase power converters, each of which being adapted to convert power output from a corresponding phase of a wind generator to a corresponding phase of a grid; each of the phase power converters comprising: a full-wave rectifier, being adapted to rectify the power input through a first terminal and a second terminal from the corresponding phase of the wind generator; a capacitor being adapted to be charged by the power rectified by the full-wave rectifier; and a full-wave active inverter, being adapted to invert the power stored in the capacitor and output the inverted power to the corresponding phase of the grid through a third terminal and a fourth terminal; wherein: the first terminal or the second terminal is connected to a first virtual neutral; and the third terminal or the fourth terminal is connected to a second virtual neutral. | 07-18-2013 |
20130188403 | 3-PHASE HIGH POWER UPS - According to one aspect, embodiments of the invention provide power converter circuitry including an input including a plurality of input lines each configured to be coupled to a phase of a multiphase AC power source having a sinusoidal waveform, a plurality of DC buses including a first positive DC bus having a first nominal DC voltage, a second positive DC bus having a second nominal DC voltage, a first negative DC bus having a third nominal DC voltage and a second negative DC bus having a fourth nominal DC voltage; a first power converter coupled to the input and configured to supply power from the multiphase AC power source to the plurality of DC buses during a first positive region of the sinusoidal waveform and a first negative region of the sinusoidal waveform; and a second power converter coupled to the input and configured to supply power from the multiphase AC power source to at least some of the plurality of DC buses during a second positive region of the sinusoidal waveform and a second negative region of the sinusoidal waveform. | 07-25-2013 |
20130188404 | Indirect Matrix Converter - An indirect matrix converter includes a converter ( | 07-25-2013 |
20130194838 | THREE-PHASE SOFT-SWITCHED PFC RECTIFIERS - A low input-current harmonic three-phase boost rectifier includes an input stage for receiving a three-phase input voltage in relation to a neutral node and an output stage adapted to couple to at least one load. The rectifier further includes one or more switching converter stages, each having a plurality of switches coupled to the neutral node, the plurality of switches operating with a fixed duty cycle, the fixed duty cycle being a substantially 50% duty cycle. The rectifier further includes one or more controllers adapted to vary the switching frequency of the plurality of switches based on at least one of a condition of the at least one load or the input voltage and includes one or more decoupling stages, each including one or more inductive elements adapted to inductively decouple the output stage from at least one of the one or more switching converter stages. | 08-01-2013 |
20130201732 | VARIABLE SPEED DRIVE PROVIDED WITH A SUPERCAPACITOR MODULE - A variable-speed drive including: a DC power supply bus including a positive line and a negative line; a bus capacitor connected between the positive line and the negative line of the DC power supply bus; an inverter module supplied with power by the DC power supply bus and controlled to provide a variable voltage to an electrical load; a first switching branch connected between the positive line and the negative line of the bus and including at least one first electronic switch; and a first module including a braking resistor, or a second module including a mechanism for storing and regenerating electrical energy generated during braking of the electrical load, wherein the first module and the second module are removable and interchangeable. | 08-08-2013 |
20130208515 | AC SIDE SOFT CHARGE CIRCUIT FOR VARIABLE FREQUENCY DRIVES - A voltage source inverter comprises a rectifier having an input for connection to a multi-phase AC power source and converting the AC power to DC power at an output. An inverter receives DC power and converts the DC power to AC power. A DC bus is connected between the rectifier circuit and the inverter circuit to provide a relatively fixed DC voltage for the inverter. A bus capacitor is across the DC bus. A soft charge circuit limits inrush current to the bus capacitor. The soft charge circuit comprises an input inductor for each phase connected between the rectifier input and the AC power source and a clamping circuit across each input inductor to limit DC bus voltage. | 08-15-2013 |
20130208516 | POWER CONVERSION EQUIPMENT - To provide a power conversion equipment which can detect short circuit failure of series connected capacitors of a smoothing capacitor circuit | 08-15-2013 |
20130215652 | POWER CONVERTER APPARATUS - There is provided a power converter apparatus including a detector detecting a system voltage, and a controller stably outputting power generated by the wind power generator to the power system based on a power instruction value and controlling an output voltage to stabilize the system voltage based on a voltage instruction value in a case where the system voltage is within a preset range, and controlling an active current component and a reactive current component of an output current to stabilize the system voltage of the power system by use of a voltage drop due to impedance of the power system in a case where the system voltage is outside the preset range. | 08-22-2013 |
20130229834 | Transformer Construction - The invention relates to a transformer construction comprising a plurality of transformer cores configured to share magnetic flux paths and, as a result, at least one of the cores comprises a post and an associated sidewall having an effective cross-sectional area which is less than that of the post. Such a construction may be employed in a power conditioning unit, for example, for a photovoltaic module, which is configured to operate the cores out of phase from each other. Also described is a transformer winding comprising a longitudinal spine having a first turn emanating from a first portion of the spine in a first transverse direction and a second turn emanating from a second portion of the spine in a second transverse direction, wherein the second transverse direction is opposite to the first transverse direction. | 09-05-2013 |
20130229835 | POWER CONVERTING APPARATUS - A power converting apparatus according to an embodiment includes a controller that controls a power converter. The controller includes a first signal generator which generates switch drive signals for AC-to-DC conversion, a second signal generator which generates switch drive signals for DC-to-AC conversion, and a drive signal generator which generates, in accordance with the switch drive signals for AC-to-DC conversion and the switch drive signals for DC-to-AC conversion, switch drive signals for controlling the power converter. The first signal generator and the second signal generator operate in synchronization with each other. | 09-05-2013 |
20130235624 | Electric Inverter - Electrical frequency converter ( | 09-12-2013 |
20130235625 | AC-AC CONVERTER - An AC-AC converter configured of a forward converter that converts alternating current to direct current and a reverse converter that converts direct current to alternating current, wherein a first semiconductor switch series circuit, a second semiconductor switch series circuit, and a capacitor series circuit are connected in parallel, a first inductor is connected between one end of an alternating current input and a series connection point of the first semiconductor switch series circuit, a bidirectional switch is connected between the one end of the alternating current input and a series connection point of the second semiconductor switch series circuit, a second inductor is connected between the series connection point of the second semiconductor switch series circuit and one end of an alternating current output, and a series connection point of the capacitor series circuit is connected to the other end of the alternating current input and the other end of the alternating current output. Because of this, it is possible to keep the inductor loss of the rectifier sufficiently small when input voltage is within a specified range. Also, in addition to this, it is possible to reduce switching loss more than in heretofore known circuits when carrying out a compensation action. | 09-12-2013 |
20130235626 | THREE-PHASE THREE-LEVEL SOFT-SWITCHED PFC RECTIFIERS - A low input-current-harmonic three-phase three-level boost rectifier includes an input stage for receiving a three-phase input voltage in relation to a neutral node and an output stage adapted to couple to at least one load. The rectifier further includes one or more switching converter stages, each having a plurality of serially-connected switches coupled to the neutral node, one of the serially-connected switches operating with a fixed duty cycle while the other of the serially-connected switches operating with a variable duty cycle, the fixed duty cycle being a substantially 50% duty cycle and the variable duty cycle being less than or equal to a substantially 50% duty cycle. The serially-connected switches are coupled to clamping diodes and clamping capacitors. The rectifier further includes one or more controllers adapted to vary the switching frequency and/or duty cycle of the plurality of switches based on at least one of a condition of the at least one load or the input voltage and includes one or more decoupling stages, each including one or more inductive elements adapted to inductively decouple the output stage from at least one of the one or more switching converter stages. | 09-12-2013 |
20130242623 | POWER CONVERTER AND INTEGRATED DC CHOKE THEREFOR - A power conversion system with multiple parallel connected motor drives including a plurality of rectifiers and a corresponding inverters connected by windings of a single common mode choke. | 09-19-2013 |
20130242624 | POWER MODULE AND POWER CONVERSION APPARATUS - A power module, which is connected to a power source, includes a rectifying unit, a filtering unit and an inverter. The rectifying unit has three legs. The filtering unit is connected to the rectifying unit, and the inverter is connected to the filtering unit. One of the three legs has two switching elements connected in series, and another one of the three legs has two rectifying elements connected in series. In addition, a power conversion apparatus including the power module is also disclosed. | 09-19-2013 |
20130258725 | Systems and Methods for Balancing UPS Source Currents During Unbalanced Load Transient Conditions - Systems and methods for balancing current from an AC source. The method includes determining a difference between a DC voltage output by a rectifier in an uninterruptible power supply (UPS) to a DC reference voltage. The method also includes determining an error between the DC voltage and the DC reference voltage based at least in part on the difference. After determining the error, the method includes filtering a second order harmonic from the error thereby generating a filtered error. The method may then include determining one or more switching signals for one or more switching components in the rectifier based at least in part on the filtered error and sending the switching signals to the rectifier. | 10-03-2013 |
20130265806 | INTELLIGENT POWER CONTROL UNIT FOR LOW VOLTAGE RIDE THROUGH AND ITS APPLICATION - An intelligent power control unit (IPCU) for low voltage ride through (LVRT) and its application. The intelligent power control unit is provided with a port A, a port B, a port C, an internal auxiliary converter for stabilizing the voltage of a stator and supplying reactive power at the moment of riding through, and a controllable active load for absorbing active power. High speed switches are provided between the port A and the port B, and the internal auxiliary converter is provided between the port A and the port C. The internal auxiliary converter and the controllable active load are sequentially connected in series between the port A and the port C; or, the internal auxiliary converter is connected with the controllable active load from the port A through three-phase bridge rectification, whereby the branch of the internal auxiliary converter is connected in parallel with the branch of the controllable active load. During application, the port A is connected with the stator winding of a wind power generator set, the port B is connected with the power grid, and the port C is connected with the direct current (DC) bus of an external auxiliary converter. | 10-10-2013 |
20130272038 | EXCITATION CONTROL CIRCUIT, CONTROL METHOD AND ELECTRICALLY EXCITED WIND POWER SYSTEM HAVING THE SAME - The present invention provides an excitation control circuit, a control method using the same and an electrically excited wind power system having the same. The excitation control circuit comprises at least one converter and at least one AC/DC conversion module. The converter is located between an AC electric grid and a wind power generator, so as to convert AC power generated by the wind power generator into AC power corresponding to the AC electric grid. The input side of the AC/DC conversion module is electrically connected between the converter and the wind power generator, and the output side is coupled to an excitation device. The AC/DC conversion module is used to convert the AC power from the wind power generator into a DC voltage, and provides an excitation current for the wind power generator using the DC voltage. | 10-17-2013 |
20130279212 | DUAL FUNCTION SOLID STATE CONVERTER - A dual function solid state power converter operable from a three phase AC input current simultaneously provides; an AC or DC output current on an aircraft power cable to provide ground power to a parked aircraft, and a low voltage DC current on a battery charging power cable to charge batteries in nearby service vehicles. The power converter includes an AC to DC converter which converts the current on an internal DC bus, a DC to AC converter which converts the DC bus current to an AC current at a higher voltage and frequency, or a DC to DC converter which converts the DC bus current to a lower voltage DC, for supplying ground power to a parked aircraft, and a DC to DC converter for converting the DC bus current to a lower voltage battery charging current on the battery charging cable. | 10-24-2013 |
20130279213 | POWER REGENERATION APPARATUS AND POWER CONVERSION APPARATUS - A power regeneration apparatus includes a power conversion unit, an AC reactor, a voltage detecting unit, a phase detecting unit, a drive control unit for controlling the power conversion unit based on a phase detection value, and a reactive current component detecting unit. The phase detecting unit detects the phase of the AC power supply. The reactive current component detecting unit detects a reactive current component of a current. The drive control unit includes a phase correction section. The phase correction section corrects the phase detection value based on the reactive current component. | 10-24-2013 |
20130279214 | POWER REGENERATIVE CONVERTER AND POWER CONVERSION APPARATUS - A power regenerative converter includes: a power conversion unit configured to convert AC power supplied from an AC power supply into DC power and convert DC power into AC power to be supplied as regenerative electric power to the AC power supply supply; an LCL filter including a reactor unit having a plurality of reactors connected in series between the power conversion unit and the AC power supply, and capacitors each having one end connected to a series connection point of the reactors in the reactor unit; a drive control unit for controlling the power conversion unit based on an AC voltage command; and a voltage command compensation unit for calculating a compensation value in accordance with a capacitor voltage being a voltage at the series connection point of the reactors and adding the compensation value to the AC voltage command input to the drive control unit. | 10-24-2013 |
20130279215 | Assembly For Converting An Input AC Voltage To An Output AC Voltage - An assembly for converting an assembly input AC voltage to an assembly output AC voltage may include: plural converters, each including a rectifier stage for rectifying an input AC voltage to a DC voltage, the rectifier including: first and second input terminals between which the input AC voltage is applied; first and second thyristors connected in series, wherein the first input terminal is connected between the first and second thyristors; first and second diodes connected in series, wherein the second input terminal is connected between the first and second diodes; and first and second output terminals between which the DC voltage is achieved, wherein the first thyristor and the first diode are connected to the first output terminal, and the second thyristor and the second diode are at least indirectly connected to the second output terminal. | 10-24-2013 |
20130286692 | FILTER CAPACITOR DEGRADATION DETECTION APPARATUS AND METHOD - Power conversion systems and methods are presented for detecting input filter capacitor degradation or approach of end of operational life based on filter capacitor current measurements using single and/or dual threshold comparisons for computed instantaneous sum of squares of filter currents or power values. | 10-31-2013 |
20130301314 | Multilevel Inverter Device and Method - An embodiment multilevel inverter comprises a first boost apparatus having an input coupled to a positive dc bus and a second boost apparatus having an input coupled to a negative dc bus. The multilevel inverter further comprise a first switch coupled to an input of an L-C filter and the first boost apparatus, a second switch coupled to the input of the L-C filter and the second boost apparatus, a third switch coupled between the positive dc bus and the first switch and a fourth switch coupled between the negative dc bus and the second switch. | 11-14-2013 |
20130301315 | METHOD FOR OPERATING AN INVERTER, AND CONTROL DEVICE - A method for limiting an output power of an inverter having an output bridge and an upstream boost converter includes determining a first measurement variable representative of a bridge temperature and a second measurement variable representative of an output power of the inverter. The method also includes determining a third measurement variable representative of a generator voltage at generator connections of the inverter or a fourth measurement variable representative of an output voltage at a power output of the inverter, and reducing the output power supplied to a power supply grid to a reduced power value. The reduced power value is determined based on the first measurement variable, the second measurement variable and at least one of the third and fourth measurement variables. A control device having such functionality is also disclosed | 11-14-2013 |
20130301316 | POWER-LEVEL WAVEFORM GENERATION METHOD - The present invention relates to a method of generating various alternating current waveforms, at power level. The AC mains power supply is rectified, processed by various circuits, controlled by a control unit and inverted as required at the output. This method may be employed with converter isolation from the mains. It is also possible to employ the system so that the input current is sinusoidal and the power factor of the converter is unity. The present invention produces preferably the sinusoidal output waveform with fundamental component at the desired frequency, where this waveform is produced employing a DC bus from which output voltage with the fundamental component at the desired shape and frequency is obtained using pulse width modulation techniques. The output stage is simply an inverter which inverts this waveform at zero-crossings of the rectified waveform to obtain an AC output. | 11-14-2013 |
20130314952 | SINGLE-PHASE REACTOR POWER SAVING DEVICE - A single-phase reactor power saving device, used to receive an AC power supply, and comprising: a first capacitor, connected electrically to said AC power supply, to store electric energy; a first and a second reactor, connected electrically to said first capacitor, to output first AC self-induced energy, and second AC self-induced energy; a center-tapped circuit, connected electrically to said first reactor and said second reactor, to convert currents of said first AC self-induced energy and said second AC self-induced energy into a DC current; a second capacitor, connected electrically to said center-tapped circuit, to store energy of said DC current; and a first DC reactor and a second DC reactor, connected electrically to said center-tapped circuit, to generate and output respectively currents of first DC self-induced energy and second DC self-induced energy to said load, to raise power saving efficiency and quality of power supply. | 11-28-2013 |
20130314953 | HARMONIC REGULATOR FOR CURRENT SOURCE RECTIFICATION AND INVERSION - A system includes a current source rectifier which has a plurality of switches configured to receive an input current from an AC voltage source and to receive a plurality of control signals. The switches are configured to produce a rectified output current based on the input current and the control signals. The system also includes a rectifier controller configured to receive a current sense signal indicative of the rectified output current and to generate the control signals based at least in part on the current sense signal, where the control signals cause the current source rectifier to attenuate at least one of a plurality of harmonic frequencies in the rectified output current. | 11-28-2013 |
20130322132 | SYSTEM FOR POWER CONVERSION - A power conversion device according to the aspects of the present technique is presented. The device includes a first converter and a second converter operatively coupled to the first converter. Moreover, the device includes a phase leg operatively coupled between the first converter, the second converter, where the phase leg includes a first unidirectional switch, a second unidirectional switch operatively coupled to the first unidirectional switch, and a first bidirectional switch, where a first end of the first bidirectional switch is operatively coupled to at least one of the first unidirectional switch and the second unidirectional switch. | 12-05-2013 |
20130322133 | SYSTEM AND METHOD FOR HIGH RESISTANCE GROUND FAULT DETECTION AND PROTECTION IN POWER DISTRIBUTION SYSTEMS - A system and method for detecting high resistance ground faults in a power distribution system is disclosed. A fault detection and protection system is provided that includes a plurality of current sensors to measure current on the three phase output of the converter-inverter arrangement of the power distribution system and a controller configured to measure the three phase current on the three phase output, extract a fundamental current component for each phase of the three phase output, extract a third harmonic component for each phase of the three phase output, compare the fundamental current component and the third harmonic component extracted from each phase to a first threshold and a second threshold, respectively, and detect a ground fault on a phase of the three phase output based on the comparisons of the fundamental current component and the third harmonic component to the first and second thresholds. | 12-05-2013 |
20130336023 | POWER CONVERSION DEVICE - A power conversion device according to embodiments includes a plurality of switch groups, a plurality of inductors, and a snubber circuit. The switch groups are respectively provided for input phases and each of the switch groups has a plurality of one-way switches that connects the corresponding input phase and output phases. The plurality of inductors are respectively connected between the input phases and the switch groups, and are coupled to one another so that current flowing through the one-way switch of one switch group moves to and continues to flow through the turned-on one-way switch of the other switch group when the one-way switch of the one switch group is turned off. The snubber circuit clamps a voltage based on the maximum voltage occurring on the plurality of inductors to a predetermined value. | 12-19-2013 |
20130336024 | Power Conversion System Including Two Transformers with Two Secondary Windings, and Drive Chain Comprising Such a Conversion System - The power conversion system comprises:
| 12-19-2013 |
20130336025 | POWER CONVERSION APPARATUS - A power conversion apparatus includes an inverter circuit, a system voltage measurement unit measuring a system voltage, a voltage drop detector detecting a voltage drop of a power system, based on the system voltage, a direct current power measurement unit measuring a direct current power to be input into the inverter circuit, an alternating current command value calculator calculating an alternating current command value to control an alternating current output from the inverter circuit, based on the direct current power and the system voltage, and a current limiter that decrease a current limit value to limit the alternating current command value, when the voltage drop is detected. | 12-19-2013 |
20130336026 | POWER CONVERSION APPARATUS - A power conversion apparatus includes an inverter circuit including a switching element, a system voltage measurement unit measuring a system voltage of a power system, a voltage drop detector detecting a voltage drop of the power system, a carrier wave generator generating a carrier wave, a carrier wave frequency modulator increasing a frequency of the carrier wave, when the voltage drop is detected, a signal wave generator generating a signal wave to control the inverter circuit, a gate signal generator comparing the carrier wave with the signal wave, and generating a gate signal, and a power conversion controller controlling the inverter circuit, based on the gate signal. | 12-19-2013 |
20130343102 | SYNCHRONIZED ISOLATED AC-AC CONVERTER WITH VARIABLE REGULATED OUTPUT VOLTAGE - In an AC-AC converter comprising a primary side, a secondary side and a regulator, wherein the regulator comprises a voltage regulation circuit configured to determine an error voltage based on an at least partially alternating feedback voltage fed into the regulator from the secondary side of the AC-AC converter and to supply this error voltage and/or an information about this error voltage to the primary side of the AC-AC converter, the regulator comprises an averaging circuit configured to determine an average DC voltage based on the feedback voltage. | 12-26-2013 |
20140003099 | FREQUENCY CONVERTER WITH DC LINK CAPACITOR AND METHOD FOR PRE-CHARGING THE DC LINK CAPACITOR | 01-02-2014 |
20140003100 | APPARATUS AND METHOD FOR CONTROLLING DC-AC POWER CONVERSION | 01-02-2014 |
20140016379 | Voltage Source Converter and Method for Controlling the Converter - A control apparatus for use with a voltage source converter includes legs each of which is configured by a plurality of converter modules each having capacitors. Each of the legs has a first terminal on a positive side and a second terminal on a negative side. The control apparatus is operative to create command pulses for operating the converter modules to operate the converter modules. The command pulses have a frequency that is a non-integral multiple of a frequency of a system voltage. The non-integral multiple is 3.5, for example. | 01-16-2014 |
20140036554 | POWER CONVERSION WITH CURRENT SENSING COUPLED THROUGH SATURATING ELEMENT - An architecture for current-modulating power-handling circuits, such as power converters, where a small saturating inductance is used to obtain a pulse edge when the main current value crosses zero. | 02-06-2014 |
20140049991 | POWER DEVICE - An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal. | 02-20-2014 |
20140063869 | METHODS OF BALANCING REACTIVE POWER IN MULTI-LEVEL MOTOR DRIVES WITH ACTIVE FRONT ENDS - A method of balancing reactive power at a power delivery system is disclosed. The method may include operating a power delivery system that may have a plurality of power cells that are electrically connected to a first transformer comprising one or more primary windings and a plurality of secondary windings such that each cell is electrically connected to one of the secondary windings and a plurality of the secondary windings are phase-shifted with respect to the primary windings. The method may further include controlling the reactive current flow at each power cell by calculating, at a first controller, a reactive current flow adjustment for at least one power cell so that reactive current flow is balanced among each of the plurality of power cells. Each cell may include a plurality of switching devices. | 03-06-2014 |
20140063870 | APPARATUS AND METHODS FOR RESTORING POWER CELL FUNCTIONALITY IN MULTI-CELL POWER SUPPLIES - A method is provided for operating a multi-cell power supply that includes multiple series-connected power cells in each of multiple legs. Each power cell includes a bypass device that may be used to selectively bypass and de-bypass the power cell. After a first power cell faults and is bypassed as a result of the fault, the method includes de-bypassing the first power cell without stopping the multi-cell power supply if the first power cell fault was caused by a predetermined operating condition. Numerous other aspects are provided. | 03-06-2014 |
20140063871 | POWER DELIVERY SYSTEMS AND METHODS FOR OFFSHORE APPLICATIONS - A system for delivering power to an offshore load is disclosed. The system may include an on-land source of three-phase power, an on-land AC-to-DC power conversion module, a DC transmission line, and an offshore DC-to-AC power inverter. The on-land AC-to-DC power conversion module may be configured to convert the three-phase power to DC power. The DC transmission line may have a source end and a load end, where the source end is configured to receive DC power from the on-land AC-to-DC power conversion module. The offshore DC-to-AC power inverter may be configured to receive DC power from the DC transmission line, convert the DC power to three-phase AC power, and deliver the three-phase AC power to an offshore load. | 03-06-2014 |
20140078791 | SYSTEMS AND METHODS FOR CONTROLLING AN INVERTER - An inverter apparatus for a photovoltaic panel includes a primary microcontroller configured to send a conversion signal to a DC to AC conversion unit. The inverter further includes a first isolator and a secondary microcontroller communicatively coupled to the primary microcontroller through the first isolator. The secondary microcontroller is configured to provide more than one communication mode to the primary microcontroller for communicating with a remote system. | 03-20-2014 |
20140085944 | DC-AC POWER CONVERTING APPARATUS AND SOLAR POWER SUPPLYING APPARATUS INCLUDING THE SAME - There are provided a DC-AC power converting apparatus including no capacitor or a small capacity capacitor for removing a ripple in an input terminal thereof by charging or discharging power according to a difference between output power and instantaneous system power of a photovoltaic cell, and a solar power supplying apparatus including the same, the DC-AC power converting apparatus including a DC-AC power converting unit converting DC power into AC power, and a charging and discharging unit charging surplus power induced when a level of the DC power is higher than that of the AC power and discharging the charged power when the level of the DC power is lower than that of the AC power. | 03-27-2014 |
20140092651 | MICRO-INVERTER WITH IMPROVED CONTROL - The invention concerns an electrical module for adapting a first signal of a first system to a second signal of a second system, including:
| 04-03-2014 |
20140104896 | REGENERATIVE VOLTAGE DOUBLER RECTIFIER, VOLTAGE SAG/SWELL CORRECTION APPARATUS AND OPERATING METHODS - Single and multiphase regenerative voltage doubler rectifiers, sag/swell corrector apparatus, and operating methods are presented in which rectifier switching devices are selectively pulse width modulated for regenerative load conditions and for regenerating power during input voltage swell circumstances. | 04-17-2014 |
20140104897 | Control Method During Zero-Crossing Operation Of Bridge Arms In UPS - A control method is disclosed that involves controlling zero-crossing operation of bridge arms in a UPS, wherein the UPS has a rectifying bridge with first and second switching transistors, a midline bridge arm with third and fourth switching transitors, and an inverter bridge arm with fifth and sixth switching transitors. The midline and rectifying bridge arms are controlled to cross zero synchronously. The inverter bridge arm is controlled to be disconnected during a period before a zero-crossing point of the rectifying bridge arm to a period after the zero-crossing point of the rectifying bridge arm. The periods before and after the zero-crossing point of the rectifying bridge arm are time differences between the zero-crossing points of the inverter bridge arm and the rectifying bridge arm. The influence of asynchronous zero-crossing between the PFC circuit and the inverter circuit on the UPS performance indices may be reduced by using the present control method. | 04-17-2014 |
20140104898 | WIRELESS ELECTRIC POWER RECEIVER FOR WIRELESSLY REGULATING ELECTRIC POWER USING SWITCH - A wireless electric power receiver for receiving wireless electric power from a wireless electric transmitter is provided. The wireless electric power receiver includes an electric power receiving unit that receives wireless electric power from the wireless electric power transmitter; a rectifying unit that rectifies wireless electric power in the form of alternating current output from the wireless electric power receiving unit and outputs rectified electric power; and an electric power regulation unit that receives an input of the rectified electric power, outputs first electric power which has a lower value of a first voltage than that of the rectified electric power for a first period, and does not output electric power for a second period, so as to output electric power with a predetermined voltage value. | 04-17-2014 |
20140112032 | WIND TURBINE FAULT DETECTION CIRCUIT AND METHOD - A wind turbine fault detection circuit and method is disclosed herein. In a described embodiment, the wind turbine fault detection circuit comprises a magnetometer in the form of a hall-effect sensor coupled between a power converter and a ground element of the power converter and configured to measure a ground current from the power converter to obtain a real ground current Ig; and a comparator configured to determine presence of a fault based on the real ground current. | 04-24-2014 |
20140119067 | APPARATUS FOR ESTIMATING CAPACITANCE OF DC-LINK CAPACITOR IN INVERTER - An apparatus for estimating capacitance of a DC link capacitor in an inverter is provided. The apparatus for estimating capacitance of a DC link capacitor selects a unit power cell in which capacitance of a DC link capacitor is to be estimated, from unit power cells, and estimates capacitance of the DC link capacitor by correcting a reference voltage that controls a plurality of unit power cells. | 05-01-2014 |
20140119068 | ELECTRIC POWER CONVERTING DEVICE AND ELECTRIC POWER CONVERTING METHOD - In one embodiment, an electric power converting device includes a converter which converts a three-phase AC voltage output from a three-phase AC power source, into a DC voltage of each phase of a three-phase AC load, and an inverter which converts the DC voltage converted by the converter, into a single-phase AC voltage of each phase of the three-phase AC load. The converter includes for each phase of an electric power system a circuit which consists of a plurality of switching elements connected in series. The electric power converting device controls on/off of a switching element corresponding to one of phases of the electric power system in the converter such that a voltage which reduces fluctuation of a DC voltage applied between the converter and the inverter and corresponding to each phase of the three-phase AC load is output from the converter for each phase of the electric power system. | 05-01-2014 |
20140126251 | CURRENT-SOURCE POWER CONVERTING APPARATUS - A current-source power converting apparatus includes: a converter unit configured to convert an AC or DC voltage input from a power supply into a predetermined DC voltage; an inverter unit configured to convert a DC voltage supplied from the converter unit via a DC reactor into an AC voltage and output the AC voltage; and a controller configured to control the inverter unit at a modulation factor in correspondence with a step up/step down ratio based on a ratio of an output voltage from the inverter unit to an input voltage from the power supply. | 05-08-2014 |
20140133197 | Communication Within A Power Inverter Using Transformer Voltage Frequency - A power inverter may include a transformer serving as an isolation barrier. The power inverter may include a first controller on one side of the isolation barrier. The first controller may encode the frequency of an input voltage of the transformer with one or more operating conditions of a direct current power supply electrically coupled to the inverter. As second controller on the other side of the isolation barrier may determine a frequency associated with an output voltage of the transformer. The second controller may decode the frequency associated with the output voltage of the transformer to determine the encoded operating conditions. | 05-15-2014 |
20140140111 | REACTOR, CONVERTER AND POWER CONVERSION DEVICE - A reactor includes a coil formed by winding a wire, and a magnetic core in which a closed magnetic path is formed by both an inner core portion inserted in the coil and an outer core portion covering outer peripheral surfaces of the inner core portion and the coil. The outer core portion is formed of a mixture containing a magnetic material and resin. One of the coil and the inner core portion has an exposed portion where a part of the outer peripheral surface is not covered with the outer core portion, and at least a part of the exposed portion is in contact with a heat dissipation layer provided in a heat dissipation plate. | 05-22-2014 |
20140146584 | ELECTRONICALLY ISOLATED METHOD FOR AN AUTO TRANSFORMER BASED 12-PULSE RECTIFICATION SCHEME SUITABLE FOR USE WITH VARIABLE FREQUENCY DRIVES - An AC/DC converter system comprises an input circuit for connection to a 3-phase AC source. An autotransformer is coupled to the input circuit for developing first and second phase shifted AC supplies. A first AC/DC converter has a first rectifier connected to the first phase shifted AC supply converting AC power to DC power across a first DC bus having a first DC bus capacitor. A second AC/DC converter has a second rectifier connected to the second phase shifted AC supply converting AC power to DC power across a second DC bus having a second DC bus capacitor. First and second sets of switches are connected between the respective first and second DC buses and a main DC bus having a main DC bus capacitor. The first and second sets of switches are controlled so that only one of the first and the second DC buses is connected to the main DC bus to charge the main DC bus capacitor. | 05-29-2014 |
20140153298 | INVERTER WITH COUPLED INDUCTANCES - An inverter for converting a direct current flowing between two input lines into an alternating current flowing between two output lines includes first and second series circuits each including two switches configured to switch at a high frequency and of an inductance connected between the switches, wherein the two inductances are magnetically coupled. The inverter further includes diodes which lead from opposite sides of the inductances to a first intermediate point and diodes leading from a second intermediate point to the opposite sides of the inductances, and an unfolding circuit which forwards a direct current flowing between the intermediate points and consisting of sine-shaped half-waves to the output lines with a polarity changing half-wave by half-wave. | 06-05-2014 |
20140169045 | BIDIRECTIONAL DEVICE, BIDIRECTIONAL DEVICE CIRCUIT AND POWER CONVERSION APPARATUS - Provided is a longitudinal bidirectional device in which current flows in a layering direction of a semiconductor layered portion formed on a front surface of a substrate, the bidirectional device comprising a first semiconductor element that includes a first channel and is formed on the semiconductor layered portion; and a second semiconductor element that includes a second channel and is provided on the substrate side of the first semiconductor element within the semiconductor layered portion. The first semiconductor element further includes a first control electrode that controls the first channel and that is formed on a surface of the semiconductor layered portion that faces away from the substrate, and the second semiconductor element is formed on at least a portion of the surface of the semiconductor layered portion on which the first control electrode is formed and includes a second control electrode that controls the second channel. | 06-19-2014 |
20140177293 | DISTRIBUTION TRANSFORMER INTERFACE APPARATUS AND METHODS - An apparatus includes at least one external source terminal configured to be connected to at least one secondary terminal of a distribution transformer and at least one external load terminal configured to be connected to a load. The apparatus further includes a converter circuit coupled to the at least one external source terminal and to the at least one external load terminal and configured to provide shunt current regulation and series voltage regulation. | 06-26-2014 |
20140198542 | SINGLE-PHASE ACTIVE FRONT END RECTIFIER SYSTEM FOR USE WITH THREE-PHASE VARIABLE FREQUENCY DRIVES - A voltage source inverter comprises a rectifier having an input for receiving single-phase AC power from an AC source and converting the AC power to DC power on a DC bus. The DC bus has first and second rails to provide a relatively fixed DC voltage. A DC bus capacitor is across the first and second rails to smooth voltage ripple. An inverter receives DC power from the DC bus and converts the DC power to AC power. An active front end circuit comprises a pair of filter capacitors in series across the first and second rails to create a midpoint. A bidirectional switch is connected between the rectifier input and the midpoint. The bidirectional switch is controlled to inject current into the midpoint of the DC bus. | 07-17-2014 |
20140204630 | CURRENT BALANCE CONTROL FOR NON-INTERLEAVED PARALLEL BRIDGE CIRCUITS IN POWER CONVERTER - Systems and methods for reducing current imbalance between parallel bridge circuits used in a power converter of a power generation system, such as a wind driven doubly fed induction generator (DFIG) system, are provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the system. Each of the bridge circuits can include a pair of switching elements, such as insulated gate bipolar transistors (IGBTs), coupled in series with one another. The switching elements of the parallel bridge circuits can be controlled, for instance, using control commands (e.g. pulse width modulation commands) according to a substantially non-interleaved switching pattern. The timing of the control commands according to the substantially non-interleaved switching pattern can be adjusted to reduce current imbalance between the parallel bridge circuits. | 07-24-2014 |
20140204631 | POWER CONVERTER WITH LOW STANDBY POWER CONSUMPTION - A power converter for converting an AC input of between frequency F1 at voltage V1 and frequency F2 at voltage V2 into a stable AC output of frequency F3 and voltage V3 comprises an AC/DC/AC/AC/DC converter ( | 07-24-2014 |
20140204632 | BYPASSED CASCADED CELL CONVERTER - In a converter for converting energy from a generator to a power network, wherein the converter comprises multiple power modules, wherein each power module includes at least two power cells and a transformer for connecting the power cells to the power network, wherein each power cell includes a phase input, a phase output, a transformer output connected to the transformer, a rectifier circuit and an inverter, the transformer (T) of a power module ( | 07-24-2014 |
20140211520 | SYSTEM AND METHOD FOR POWER CONVERSION - A grid-side transformerless power conversion system configured to perform power conversion between a power grid and a load, the transformerless power conversion system includes a first converter, a first filter, and a second converter. The first converter is configured to convert first AC power provided from the power grid into DC power. The first converter includes a first converter module and a second converter module coupled to the first converter module to form a nested neutral point piloted topology. The first filter is coupled between the power grid and the first converter. The second converter is coupled to the first converter. The second converter is configured to convert the DC power into second AC power and provide the second AC power to the load. | 07-31-2014 |
20140233278 | SYSTEM AND METHOD FOR SINGLE-PHASE AND THREE-PHASE CURRENT DETERMINATION IN POWER CONVERTERS AND INVERTERS - A system and method for capturing current information for a power converter is disclosed. The current monitoring system includes a control system operably connected to a circuit having a plurality of semiconductor switches that are controllable to convert an input power to an output power having a desired voltage and current. The control system includes a PWM signal generator to generate switching signals that control switching of the switches, gate drivers to facilitate switching of the switches, and desaturation circuits to provide overcurrent protection to the switches. The control system further includes a processor that receives voltage data from the desaturation circuits regarding a measured voltage across each of the switches, determines a current through each of the switches based on the voltage across each respective switch, and calculates an input current to the circuit or an output current of the circuit based on the determined currents through the switches. | 08-21-2014 |
20140233279 | POWER CONVERSION APPARATUS - An inverter circuit including a DC capacitor is connected in series to an AC power supply, and at the stage subsequent to the inverter circuit, a smoothing capacitor is connected via a converter circuit. A short-circuit period T for short-circuiting the AC terminals of the converter circuit is provided in one cycle, whereby the converter circuit is controlled, and PWM control is performed for the inverter circuit so as to improve an AC power supply power factor. When current control by the inverter circuit cannot be performed, the PWM control is switched to PWM control for the converter circuit, to perform current control. | 08-21-2014 |
20140233280 | POWER CONVERSION DEVICE - An electric power conversion device comprises a conversion circuit having bi-directionally switchable plural pairs of switching elements connected to respective phases and converting an inputted AC power into an AC electric power. A first switching time is calculated using detected voltages detected by voltage sensors and an output command value. A second switching time is calculated using a carrier and the first switching time. A control signal generating section generates control signals to switch on and off of the switching elements using the first switching time and second switching time. In a case where a state is transited from the first switching time to the second switching time, a controller tarns off one of on state switching elements of either one of an upper arm circuit or a lower arm circuit and maintains on state of the other of the on state switching elements of the other arm circuit. | 08-21-2014 |
20140241015 | CONTROL DEVICE EMPLOYED IN A SWITCHED ELECTRICAL POWER SUPPLY SYSTEM - The invention relates to a control device ( | 08-28-2014 |
20140254217 | METHOD AND APPARATUS FOR RIPPLE AND PHASE LOSS DETECTION - Methods and apparatus are presented for detecting phase loss and/or excessive ripple in a power converter, in which bandpass filters are used to obtain harmonic voltage amplitudes associated with the power converter DC bus, and phase loss is detected if a ratio of the second harmonic to the sixth harmonic and/or a ratio of the fourth harmonic to the sixth harmonic exceed predetermined threshold values. | 09-11-2014 |
20140268928 | POWER CELL BYPASS METHOD AND APPARATUS FOR MULTILEVEL INVERTER - Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass. | 09-18-2014 |
20140268929 | DC/AC CONVERTER AND METHOD OF CONTROLLING A DC/AC CONVERTER - A DC/AC converter includes a DC/DC conversion stage with galvanic isolation and a DC/AC conversion stage, wherein the DC/DC conversion stage comprises a pair of first side terminals providing or receiving a first DC voltage, a pair of second side terminals providing or receiving a second DC voltage and coupled to the DC/AC conversion stage, at least one first side converter circuit coupled between the pair of first side terminals, a series connection of a plurality of second side converter circuits coupled between the pair of second side terminals, and at least one transformer circuit coupling the plurality of second side converter circuits to the at least one first side converter circuit, wherein a connection point between two of the plurality of second side converter circuits is coupled to the DC/AC conversion stage and forms a neutral phase point thereof. | 09-18-2014 |
20140268930 | POWER SUPPLY METHOD AND APPARATUS - A method and apparatus for providing a power supply for an amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors. | 09-18-2014 |
20140286059 | SPARSE AND ULTRA-SPARSE PARTIAL RESONANT CONVERTERS - The AC portion of the input of the ultra-sparse partial resonant power converter contains three pairs of forward-conducting-bidirectional-blocking switches connected in a first direction, and two pairs of forward-conducting-forward-blocking devices connected in a second direction to the three pairs of forward-conducting-bidirectional-blocking switches. The second direction is opposite to the first direction. The AC portion of the output of the ultra-sparse partial resonant power converter contains three pairs of forward-conducting-bidirectional-blocking switches connected in a first direction, and two pairs of forward-conducting-reverse-blocking devices connected in a second direction to the three pairs of forward-conducting-bidirectional-blocking switches. The forward-conducting-reverse-blocking devices can be switches or diodes. | 09-25-2014 |
20140293663 | Modular Configurable Multi-Megawatt Power Amplifier - In an embodiment, a power converter includes: a plurality of power amplifier units, each having: a plurality of slice each with a power conversion module including an AC/DC/AC converter; a mains controller to control the plurality of slices; and a feedback conditioning system coupled to the mains controller; a plurality of input contactors and a plurality of output contactors via which each of the plurality of power amplifier units is to couple between a transformer and a load; and a master controller coupled to the plurality of power amplifier units. | 10-02-2014 |
20140321171 | POWER CONVERSION DEVICE - A power conversion device including a power conversion portion that switches direct current voltage supplied by a positive line and negative line of a direct current power supply with a semiconductor switching element, and outputs converted voltage, is such that a plurality of interline capacitors are connected in parallel between the positive line and negative line, the capacitance of the plurality of interline capacitors is of a value that becomes smaller the nearer to the power conversion portion the position in which the interline capacitor is connected, and the capacitance of the interline capacitor with the smallest value of capacitance is set to a value greater than that of the capacitance between main electrodes when a direct current voltage is applied to the switching element used in the power conversion portion. | 10-30-2014 |
20140328091 | POWER CONVERTER - A power converter includes a rectifier section, an inverter section, a capacitance element connected between inverter section input ends, an inductance element forming part of an LC filter with the capacitance element, a voltage detector detecting an inductance element voltage, and a controller controlling the inverter section based on the detected voltage. The LC filter has a resonance frequency set such that ripple current components contained in DC current outputted from the rectifier section passes through, and current components of a frequency equal to a carrier frequency of the inverter section are dampened. The controller controls the inverter section so that a transfer characteristic of input voltage of the inverter section versus the DC voltage from the rectifier section becomes a damping characteristic given by a phase lead element and a second-order lag element connected in series, and a damping coefficient of the transfer characteristic is set larger than 1. | 11-06-2014 |
20140334199 | Five-Level Power Converter, and Control Method and Control Apparatus for the Same - A five-level power converter and a control method for the same are provided. The five-level power converter includes an inverter and at least a rectifier, where the rectifier includes at least one rectifier control circuit and four capacitors which are divided into two groups, each with two capacitors connected in parallel, where a first end of a first capacitor to a fourth capacitor is grounded; the rectifier control circuit is configured to input a current to a second end of the first capacitor to the fourth capacitor; and a polarity of charges accumulated at the second ends of the first capacitor and the second capacitor is opposite to a polarity of charges accumulated at the second ends of the third capacitor and the fourth capacitor; and the inverter includes a discharge control circuit, and a first inductor unit and a first load connected in series. | 11-13-2014 |
20140362620 | MULTILEVEL INVERTER - A multilevel inverter having a configuration adequate to enhance efficiency while reducing conduction loss is disclosed, the multilevel inverter including a rectifier, a smoothing unit and an inverter unit, wherein the inverter unit includes a first switch unit interposed between the first node and a first output terminal, second switch units interposed between the second node and the first output terminal, a third switch unit interposed between the third node and the first output terminal, a fourth switch unit interposed between the first node and a second output terminal, fifth switch units interposed between the second node and the second output terminal and a sixth switch unit interposed between the third node and the second output terminal. | 12-11-2014 |
20140369088 | MULTI-LEVEL INVERTER - A multi-level inverter includes: a rectifying unit to rectify received a three-phase voltage; a smoothing unit to receive the rectified voltage and provide the rectified voltage as voltages having different levels to first to third different nodes; and an inverter unit including a plurality of switch units to transfer the voltages having three levels provided from the smoothing unit, wherein the inverter unit includes a first switch unit provided between the first node and a first output terminal, a second switch unit provided between the second node and the first output terminal, a third switch unit provided between the third node and the first output terminal, a fourth switch unit provided between the first node and a second output terminal, a fifth switch unit provided between the second node and the second output terminal, and a sixth switch unit provided between the third node and the second output terminal. | 12-18-2014 |
20140369089 | POWER CONVERSION CONTROL DEVICE - A period composed of a total of three periods, namely a period when an actual voltage vector is employed and periods before and after it can be regarded as an isolation period when an actual voltage vector is isolated in a vicinity where switching for commutation in a current-source converter is generated. When the switching in the current-source converter occurs at the isolation period, zero-current switching is realized. When presence of dead time is thus taken into consideration, a width of the timing when the zero-current switching is realized is made to be broader than a case where the presence of the dead time is not taken into consideration by the dead time. | 12-18-2014 |
20140376282 | POWER CONVERSION SYSTEM, AND VOLTAGE DETECTION DEVICE THEREOF - A detection target voltage is divided by a voltage divider circuit wherein a large number of resistor circuits, each of which is formed by a plurality of resistors being connected in parallel, are connected in series, and the voltage is detected. The output of a multiple voltage detector circuit formed of an operational amplifier, and the like, connected to three arbitrary places in the voltage divider circuit is input into a CPU twice, when the switch is in an on-state and when it is in an off-state. The CPU, based on the two measured voltages, can determine that trouble has occurred when there is, for example, trouble such as a short circuit or disconnection of a resistor of the resistor circuits related to the places connected to the three places in the voltage divider circuit. | 12-25-2014 |
20150009726 | GROUND SCHEME IDENTIFICATION METHOD - The present techniques include methods and systems for detecting the grounding condition of an electrical system to automatically determine a suitable electrical drive configuration. The drive includes a test resistor which may be connected or disconnected from the drive to measure different drive voltages. The measured drive voltages are analyzed to determine a type of grounding configuration of the electrical system in which the drive is to be installed. Embodiments also include determining ground resistance condition such as a high resistance ground (HRG) fault or a ground resistance fault when the drive is in operation. | 01-08-2015 |
20150029764 | TRANSFORMER-LESS UNIFIED POWER FLOW CONTROLLER - A power control device includes a first terminal, a second terminal connected to a transmission line, a first cascade multilevel inverter (CMI) and a second CMI. The first CMI is connected to the second terminal. The second CMI connected in series between the first terminal and the second terminal. | 01-29-2015 |
20150043253 | POWER CONVERSION DEVICE - A power conversion device | 02-12-2015 |
20150049524 | POWER CONVERTER WITH A MULTI-LEVEL BRIDGE TOPOLOGY AND CONTROL METHOD - The present subject matter is directed to apparatus and methods for producing a variable frequency output waveform from a power converter for use in a power generation system, such as a wind turbine power generation system. A voltage divider is employed to provide plural voltage levels to which a multi-level bridge circuit employing selectively activated switches in pairs of switches is coupled. The switches are operated in such a fashion as to produce a generally sinusoidal waveform that may be easily filtered by low cost filters due to the plural voltage levels to produce a generally smooth sine wave from the converter. Such converters may be used in various environments including in pairs in multi-phase power converters. | 02-19-2015 |
20150049525 | INVERTER AND POWER SUPPLYING METHOD THEREOF AND APPLICATION USING THE SAME - An inverter and a power supply method thereof and an application thereof are provided. The inverter includes a DC-DC conversion circuit, an inverting circuit and an auxiliary power circuit. The DC-DC conversion circuit converts a DC input voltage into a DC bus voltage. The inverting circuit is configured to convert the DC bus voltage into an AC output voltage. The auxiliary power circuit is enabled in response to the DC input voltage, and the auxiliary power circuit generates a first auxiliary power for enabling the DC-DC conversion circuit after being enabled. The DC-DC conversion circuit is enabled in response to the first auxiliary power, and the DC-DC conversion circuit generates a second auxiliary power for enabling the inverting circuit after being enabled, such that the inverting circuit is enabled in response to the second auxiliary power and generates the AC output voltage. | 02-19-2015 |
20150078042 | Power Supply and Method - A power supply includes a plurality of electronic components including one or more of a rectifier and a switching transistor, an input port configured to receive electrical energy from a power source and a circuit board comprising a cavity. At least one of the rectifier and the switching transistor is embedded in the cavity. The cavity is arranged proximal to the input port such that at least a portion of thermal energy generated by one or more of the rectifier and the switching transistor is dissipated from the power supply by way of the input port. | 03-19-2015 |
20150078043 | CONTROLLER FOR A VOLTAGE CONVERTER - In some examples, a control module for a voltage converter may have an input for connection to an AC supply having an operating voltage range. A first detector is provided for detecting the operating voltage range of the AC supply and generating a first control signal to identify the detected operating voltage range. A second detector is also provided for detecting the operating voltage range of the AC supply and generating a second control signal to identify the detected operating voltage range. The control module has one or more switches for selectively enabling and/or disabling a voltage multiplier in response to said first and second control signals. The present disclosure also relates to a method of controlling a voltage converter. | 03-19-2015 |
20150098257 | MULTIFUNCTION POWER CONVERTER WITH OPTION FOR INTEGRATED MAGNETICS - Power converter modules and parallel conversion systems are presented in which the modules are provided in a rollable enclosure having AC and DC electrical connections, and an interior including a switching circuit with switching devices individually connected between a corresponding AC node and a corresponding DC node for operation as either a rectifier or an inverter and an internal filter circuit with inductors individually connected between a corresponding AC node of the switching circuit and a corresponding AC electrical connection, with a built-in blower or fan to cool the filter circuit during operation. | 04-09-2015 |
20150098258 | CONVERTER CIRCUIT - A converter circuit with short-circuit protection can include a plurality of phase legs having a series connection of normally-on switches, between voltage rails of a DC voltage link, a DC link capacitor, and AC voltage connection points between the normally-on switches. A phase-to-phase short-circuit protection circuit includes a parallel connection of a resistive component and a controllable switch. The phase-to-phase short-circuit protection circuit including a first terminal connected to an AC voltage connection point and a second terminal forms an input or an output of the converter circuit; and a controllable switch is connected in series with the DC link capacitor. Upon lack of control of the normally-on switches the controllable switch of the at least one phase-to-phase short-circuit protection circuit and the controllable switch of the phase leg short-circuit protection circuit are adapted to be controlled to a non-conductive state. | 04-09-2015 |
20150109833 | SMART GRID POWER CONVERTER - A DC-to-AC power converter is disclosed. The power converter has a DC input to receive DC power from a photovoltaic device, an AC output configured for direct connection to an AC mains power supply line, six semiconductor switches, one isolated high-frequency power transformer, two high-frequency inductors, a small resonant capacitor, and a large non-electrolytic (e.g. film) capacitor energy storage component. One of the semiconductor switches located on the primary side of the transformer operates to regulate the voltage across the non-electrolytic capacitor energy storage component. A second semiconductor switch located on the primary side of the transformer provides a resonant reset for the energy stored in the transformer and allows the first semiconductor switch to operate with nearly zero-voltage-switching. The other four semiconductor switches and a high-frequency inductor coupled to the ac output operate with a variable switching frequency to produce a sinusoidal current into the ac output such that the sinusoidal current may be either in phase or out of phase with the ac output voltage. | 04-23-2015 |
20150117073 | STABLE REGENERATIVE BI-DIRECTIONAL CELL FOR BRIDGE POWER INVERTERS - A high efficiency, multi-mode, regenerative AC-DC-AC inverter power system contains an inverter bridge, a bi-phase matrix (BP-Mtx) containing reverse current oriented, series-connected sets of controllable switches, wherein inputs to a first and second set of controllable switches are coupled to the inputs of the first inverter bridge, and outputs of the first and second set of controllable switches are coupled to inputs to a third set of controllable switches. A chargeable DC power supply is coupled to an output of the third set of controllable switches. The load-side DC-bus is coupled to outputs of the first inverter bridge and a second inverter bridge. The switches of the first inverter bridge, second inverter bridge, and BP-Mtx are modulated to charge the DC power supply from either excess voltage from line inputs or the DC-bus, and to provide compensating energy from the DC power supply for load or line input perturbations. | 04-30-2015 |
20150124497 | METHOD FOR OPERATING A CONVERTER CIRCUIT - A method is disclosed for operating a converter circuit, in which controllable power semiconductor switches of the rectifier unit of a converter circuit are controlled by a rectifier switch signal and the controllable power semiconductor switches of the inverter unit of the converter circuit are controlled by an inverter switch signal. In order to reduce losses in the no-load state of the converter circuit, the rectifier switch signal is blocked in order to disconnect the controllable power semiconductor switches of the rectifier unit if defined conditions of the converter circuit are fulfilled. | 05-07-2015 |
20150138849 | PRE-CHARGING CIRCUIT OF INVERTER - A pre-charging circuit of inverter is disclosed, the pre-charging circuit of inverter including a relay arranged between an output node of the rectifier and an input node of the DC-link capacitor, and a pre-charging resistor arranged between an output node of the rectifier and an input node of the inverter unit, whereby a degree of freedom for PCB design can be obtained. | 05-21-2015 |
20150138850 | POWER CONVERSION CIRCUIT AND METHOD FOR CONTROLLING DIRECT CURRENT-ALTERNATING CURRENT CIRCUIT - A power conversion circuit includes: an AC-DC circuit, a direct current-alternating current DC-AC circuit, and a first filter capacitor. The DC-AC circuit includes: a third bridge arm, a fourth bridge arm, a first inductor, a second inductor, a first switch transistor, and a second switch transistor, a second end of the first inductor is connected to a first end of the first switch transistor, a second end of the first switch transistor is connected to the direct current bus, a first end of the second inductor is connected to a connection point of two switch transistors included by the fourth bridge arm, a second end of the second inductor is connected to a first end of the second switch transistor, and a second end of the second switch transistor is connected to the direct current bus. | 05-21-2015 |
20150295508 | Power Management, Phase Balancing, and Energy Storage Method - A method for improving phase balance in a three-phase power system, such as a three-phase system feeding Single Wire Earth Return distribution networks. The inventive system can take power from a suitable source—including the three-phase distribution itself—and feed it to a “weaker” phase to improve balance. In addition, the system can store energy taken from the three-phase power system during off-peak periods and use this to boost a weaker phase during periods of phase imbalance. The inventive system preferably uses an organic Rankine cycle heat engine to extract stored thermal energy and use it to boost a weak phase or phases. The organic Rankine cycle heat engine may also take power from renewable sources such as solar collectors. | 10-15-2015 |
20150303268 | DIODE AND POWER CONVERSION DEVICE - It is an object of the present invention to provide a diode that can be produced with a simple method and performs a favorable recovery operation. The diode in accordance with the present invention includes a layer with a high concentration of dopants and a layer with a low concentration of dopants, and the layer with a low concentration of dopants further includes a layer with a different activation rate from other potions (see FIG. | 10-22-2015 |
20150303820 | CURRENT SIGNAL GENERATOR AND METHOD OF IMPLEMENTING SUCH A GENERATOR - A generator for providing regulated current signals, to terminals of a load includes: a plurality of secondary stages, including a direct voltage source insulated from those of other stages, connected in series between the midpoint of the second half-bridge of each secondary stage and the midpoint of the first half-bridge of the next secondary stage, the load terminals being respectively connected to the midpoint of the first half-bridge of a first secondary stage, and to the midpoint of the second half-bridge of a last secondary stage; and a control circuit capable of: selecting a group of secondary active stages, and at least one regulating stage; simultaneously controlling each active stage, except the regulating stage, at the frequency of the current slots; controlling the regulating stage according to a frequency higher than the previous one; and controlling the switches of the non-selected secondary stages to insulate their voltage source. | 10-22-2015 |
20150311814 | METHOD OF INITIATING A REGENERATIVE CONVERTER AND A REGENERATIVE CONVERTER - The invention is related to a method of initiating a regenerative converter ( | 10-29-2015 |
20150318704 | Power-Packet-Switching Converter With Sequenced Connection To Link Inductor - Methods and systems for managing link voltages in a power converter, where single phase, three phase or universal systems can be used. Common mode management refers to shifting of voltages in a particular direction to perform transition between input and output ports, in addition to maintaining soft switching property. Voltages in power converters can be freely increasing and decreasing, and thus damage to the circuit can be caused if these voltages change are not controlled. | 11-05-2015 |
20150326212 | CIRCUIT FOR COMPARISON OF A VOLTAGE WITH A THRESHOLD AND CONVERSION OF ELECTRICAL ENERY - The instant disclosure relates to a circuit for comparing a voltage with a first threshold, in which said first threshold depends on a second threshold of opening at least one first normally closed breaker. | 11-12-2015 |
20150333652 | DEVIATION COMPENSATION METHOD OF POTENTIAL TRANSFORMER - A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: providing first to Nth potential transformers to be installed at different locations in a high voltage direct current (HVDC) transmission system; supplying a first voltage to the first to Nth potential transformers provided; measuring voltage values output through the first to Nth transformers by the first voltage supplied; determining whether there is a deviation between the measured voltage values; and determining compensation values for correcting the measured voltage values to the same voltage value when there is the deviation. | 11-19-2015 |
20150333653 | DEVIATION COMPENSATION METHOD OF POTENTIAL TRANSFORMER - A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: detecting an output voltage value of a first potential transformer; checking a compensation value applied to the first potential transformer; compensating for the output voltage value based on the compensation value to measure an actual voltage value for a location at which the first potential transformer is installed; verifying the validity of the measured actual voltage value; and resetting a deviation compensator measuring the actual voltage value according to a result of verification on the validity of the actual voltage value. | 11-19-2015 |
20150340961 | POWER CONVERTER - The disclosure provides a power converter including a cabinet, a first converter circuit module, a second converter circuit module, and a DC capacitor module. The first converter circuit module includes at least one first bridge arm. The second converter circuit module includes at least one second bridge arm. The first converter circuit module, the second converter circuit module, and the DC capacitor module are disposed in the cabinet. The second bridge arm and the first bridge arm are arranged side by side in parallel. The DC capacitor module is electrically connected between the first bridge arm and the second bridge arm, so that the first bridge arm and the second bridge arm share the DC capacitor module. | 11-26-2015 |
20150349654 | VOLTAGE-ADJUSTING DEVICE AND METHOD IN POWER CONVERSION SYSTEM - The present disclosure provides a voltage-adjusting device applied in a power conversion system including a Vienna rectifier, a direct current (DC) bus, and an inverter. The voltage-adjusting device includes a grid voltage sampling module for sampling a grid voltage, a given bus voltage calculation module, a voltage-adjusting module, a current control module and a pulse width modulation module. The given bus voltage calculation module calculates a given value of the DC bus voltage based on the grid voltage. The current control module receives a three phase AC current from the grid, the active current given signal and the reactive current given signal to output a three phase control voltage. The pulse width modulation module outputs a pulse control signal to the Vienna rectifier. | 12-03-2015 |
20150364985 | SYSTEM FOR OPERATION CONTROL OF INVERTER IN EMERGENCY SITUATION - A system for inverter operation control in an emergency situation is provided, the system including: an inverter; an upper level controller configured to set a first operation mode for a normal operation of the inverter and a second operation mode in response to an emergency situation of the inverter; and a controller configured to control an operation of the inverter, by stopping an operation of the inverter when a measured voltage value or a measured current value of the inverter satisfies a first condition when the first operation mode is set, and by maintaining an operation of the inverter even when a measured voltage value or a measured current value of the inverter satisfies a first condition when the second operation mode is set. | 12-17-2015 |
20150365008 | POWER CONVERSION DEVICE AND CONTROL METHOD THEREFOR - A power conversion device includes a converter, a DC reactor, and an inverter. A control unit controls the converter according to a sum of a feedback control amount and a feedforward control amount, the feedback control amount being calculated based on a deviation between a current command value and the DC current flowing into the DC reactor, the feedforward control amount being set in accordance with a DC voltage provided from the converter through the DC reactor. When an output frequency of the inverter is in a first region, the control unit reduces a control gain used to calculate the feedforward control amount, as compared to when the output frequency is in a second region having a frequency lower than that of the first region. | 12-17-2015 |
20150365009 | SIGNAL CONVERSION CIRCUIT AND POWER SUPPLY APPARATUS - A power supply apparatus including: a boost converter configured to generate a power supply voltage to drive to a load circuit from a voltage received from a voltage generation unit; an oscillator configured to receive the minute voltage, and to generate an alternating current signal; and a signal conversion circuit which further includes a half-wave generation circuit configured to receive the alternating current signal, and to generate a half-wave signal of a high potential side or a low potential side, and at least one inverter configured to receive the generated half-wave signal, and to generate a pulse signal; wherein the boost converter is driven by the pulse signal output from the signal conversion circuit in order to generate the power supply voltage. | 12-17-2015 |
20150365010 | POWER CONVERTER - A power converter with a simple configuration capable of controlling a rush current is provided. The power converter is installed between an electric power system and a power storage device, includes a harmonic filter in an AC circuit on the electric power system side and a DC capacitor and a DC breaker in a DC circuit on the power storage device side, and performs AC/DC conversion processing using an inverter. The power converter is configured in such a way that, when the power storage device starts running, a current limited by a limiting resistor is given from the electric power system side to the DC capacitor, the difference between the voltage of the DC capacitor and the voltage of the power storage device is monitored, and the power converter is connected to the power storage device by switching on the DC breaker on the basis of the difference. | 12-17-2015 |
20150372584 | DC-AC CONVERSION DEVICE, CONTROL CIRCUIT CONTROLLING OPERATION OF DC-AC CONVERSION DEVICE, AND CONTROL METHOD FOR CONTROLLING OPERATION OF DC-AC CONVERSION DEVICE - Provided is a DC-AC conversion device capable of reducing ripple current output from a battery. | 12-24-2015 |
20150372669 | Pulse Frequency Modulation Circuit and Power Adapter - Disclosed are a pulse frequency modulation circuit and a power adapter. The pulse frequency modulation circuit includes a first multiplier, a second multiplier, a third multiplier, a divider and an adder sequentially and electrically connected to one another. The second multiplier includes an output terminal connected to an input terminal of the divider, a first input terminal, and a second input terminal connected to an input terminal circuit of the adder. To prevent the uncertain timing of the critical operating status of the time control circuit detected by the conventional zero-crossing detection method, the pulse frequency modulation circuit and power adapter adopt the pulse frequency modulation circuit for computation and output a control signal to control the OFF/ON time of a transistor in the power adapter, so as to control the timing of the operating status of the power adapter precisely. | 12-24-2015 |
20150381070 | AC-AC CONVERTER DEVICE - An AC-AC converter device includes first and second AC input terminals and first and second AC output terminals. An input device is connected between an input node, a common node, a positive DC terminal and a negative DC terminal, wherein the input node is connected to the first AC input terminal via a first input inductor. An output device is connected between an output node, the positive DC terminal and the negative DC terminal, wherein the output node is connected to the first AC output terminal via an output inductor. A common device is connected between the common node, the positive DC terminal and the negative DC terminal, where the common node is connected to the second AC input terminal via a common inductor. A control device is provided for controlling the switches of the output device and the common device. | 12-31-2015 |
20160020704 | INVERTER DEVICE - An inverter device includes: a simulation output voltage generation unit that generates a simulation output voltage that corresponds to an instantaneous value of an alternating current output voltage and that has a waveform whose peak value is smaller than a peak value of the output voltage; a circuit that generates a peak value detection voltage by rectifying and smoothing the simulation output voltage; and a monitor circuit that compares the peak value detection voltage, or a voltage obtained by dividing the peak value detection voltage, with a reference voltage and transmits a feedback signal according to the result of the comparison to the control circuit. The control circuit changes a duty ratio of a switching signal for performing on/off control on the switching element in accordance with the feedback signal and controls the peak value detection voltage to keep a given value. | 01-21-2016 |
20160028321 | POWER CONVERTERS FOR AIRCRAFT STARTER/GENERATORS - A method of converting power includes receiving alternating current (AC) at the first phase leg set of a power conversion system having first and second phase legs sets connected by direct current (DC) leads. The first phase leg set rectifies the received AC power into DC power by switching outer switches of the first phase leg set into an off state. The DC lead conveys the DC power from the first phase leg set to the second phase leg set. The second phase leg set inverts the DC power into AC power. | 01-28-2016 |
20160036343 | SEMICONDUCTOR DEVICE - Converter output terminals of a converter are located adjacent to each other on a first side and an external terminal for external connection of a composite module is located adjacent to the converter output terminal. AC input terminals of the converter are located on a second side. Each of the distances between the converter output terminals and between the converter output terminal and the external terminal is set to a first formation pitch. Each of the distances between the AC input terminals is set to a second formation pitch. The first formation pitch is set to be equal to the second formation pitch. | 02-04-2016 |
20160069327 | WIND POWER CONVERTER DEVICE AND CONVERTER DEVICE - A wind power converter device is provided. The wind power converter device includes grid side converters, generator side converters and a DC bus module. Each of the grid side converters includes grid side outputs electrically coupled to a grid and a first and a second DC inputs. Each two of the neighboring grid side converters are connected in series at the second and the first DC inputs. Each of the generator side converters includes generator side inputs electrically coupled to a generator device and a first and a second DC outputs. Each two of the neighboring generator side converters are coupled in series at the second and the first DC outputs. The DC bus module is electrically coupled between the grid side converters and the generator side converters. | 03-10-2016 |
20160099335 | SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME - A semiconductor device includes: a first electrode; a second electrode; an interlayer insulating film made of a porous insulating material and formed above the first electrode and the second electrode; and connection parts electrically connected to the first electrode and the second electrode respectively, wherein a cavity is formed between the interlayer insulating film and a surface of the first electrode, a surface of the second electrode, and parts of surfaces of the connection parts. | 04-07-2016 |
20160099654 | THREE-LEVEL CONVERTER AND METHOD FOR CONTROLLING THREE-LEVEL CONVERTER - A three-level converter and a method for controlling a three-level converter, wherein the third (S | 04-07-2016 |
20160111968 | Inverter Power Supply System - An inverter power supply system includes an inverter circuit and a feedback circuit, where the inverter circuit is configured to convert a first alternating current voltage into a second alternating current voltage, and convert a first alternating current into a second alternating current; the feedback circuit determines whether a value of the second alternating current voltage exceeds a preset threshold; and when the value of the second alternating current voltage exceeds the preset threshold, the feedback circuit acquires a feedback current, compensates for a reference value of the first alternating current according to the feedback current, generates a control signal according to a reference value, after compensation, of the first alternating current, and outputs the control signal to the inverter circuit to adjust the value of the second alternating current voltage. | 04-21-2016 |
20160141969 | ELECTRICAL ASSEMBLY - An electrical assembly includes a DC tap including first and second tap terminals that are respectively connectable to first and second DC power transmission media, the DC tap including a tap limb extending between the first and second tap terminals and having two limb portions separated by a third tap terminal connectable to an electrical load, each tap limb portion including a DC blocking capacitor. The assembly further includes a current return configured to electrically interconnect the or each AC terminal to the third tap terminal, a converter unit, and a controller configured to selectively control the converter unit to generate at least one first non-fundamental frequency alternating current component at the or each AC terminal and modify the or each first non-fundamental frequency alternating current component to enable the DC tap to draw power from the DC electrical network for supply to the electrical load. | 05-19-2016 |
20160141970 | POWER CONVERSION APPARATUS - A power conversion apparatus that switches, with a relay unit, from a disconnected state to a connected state between a connector and at least one of a commercial power system and a load while a switching device is in an off state. | 05-19-2016 |
20160141971 | VOLTAGE-TYPE DC POWER SUPPLY AND CONTROL METHOD OF VOLTAGE-TYPE DC POWER SUPPLY - In a voltage-type DC power supply provided with an inverter, current supply from the inverter to the load side is suppressed when arc is generated. DC output from the voltage-type DC power supply is suspended and resumed: upon suspending the DC output, the chopper is separated from the inverter, thereby suppressing excessive current to the load when arc is generated, allowing the arc to be extinguished at high speed, and holding the current passing through the chopper in the form of circulating current. Upon restarting the inverter, the circulating current being held is supplied to the load, thereby reducing a delay of supply of DC power to the load at the time of resuming the DC output from the voltage-type DC power supply. | 05-19-2016 |
20160141972 | POWER CONVERSION APPARATUS - A power conversion apparatus includes an inductor inserted between a secondary winding and a switching device, and an auxiliary switching device inserted between the secondary winding and the switching device in parallel to the inductor. The auxiliary switching device is in an off state in a power supply mode in which an output voltage and an output current of a connector have the same polarity. The auxiliary switching device is in an on state in a power regeneration mode in which the output voltage and the output current of the connector have different polarities. | 05-19-2016 |
20160156277 | POWER DEVICE | 06-02-2016 |
20160164427 | Apparatus and Method for Controlling DC-AC Power Conversion - An apparatus and method for controlling the delivery of power from a DC source to an AC grid includes an inverter configured to deliver power from the unipolar input source to the AC grid and an inverter controller. The inverter includes an input converter, an active filter, and an output converter. The inverter controller includes an input converter controller, an active filter controller and an output converter controller. The input converter controller is configured to control a current delivered by the input converter to a galvanically isolated unipolar bus of the inverter. The output converter is configured to control the output converter to deliver power to the AC grid. Additionally, the active filter controller is configured to control the active filter to supply substantially all the power that is deliver by the output controller to the AC grid at a grid frequency. | 06-09-2016 |
20160172992 | AC DRIVE SCR AND RELAY PRECHARGING APPARATUS | 06-16-2016 |
20160190278 | COMPOUND SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A compound semiconductor device includes: an electron transit layer; an electron supply layer formed over the electron transit layer; and a GaN cap layer formed over the electron supply layer, wherein the electron supply layer includes a first layer made of i-type Al | 06-30-2016 |
20160190907 | SPLIT PHASE POWER CONVERSION APPARATUSES, METHODS AND SYSTEMS - Split phase power conversion apparatuses, methods and systems are disclosed. One exemplary embodiment includes a generator, an AC/DC converter coupled with the generator, a DC bus coupled with the AC/DC converter, and an inverter coupled with the DC bus. The inverter includes first, second, and third legs each including a plurality of switches. A first controller provides a control signal to the first leg based upon a voltage between a first system output and a second system output and a first current provided to the first system output. A second controller provides a second control signal to the second leg based upon a voltage between the second system output and a third system output and a second current provided to the third system output. A third controller controls the third leg to provide an output equal to one half of the DC bus voltage. | 06-30-2016 |
20160204709 | PRECHARGING APPARATUS AND POWER CONVERTER | 07-14-2016 |
20160254758 | Power Conversion Apparatus | 09-01-2016 |
20160380549 | AC-AC POWER SOURCE CONVERSION DEVICE AND CONVERSION METHOD THEREOF - An AC-AC power source conversion device, comprising a rectifier circuit ( | 12-29-2016 |
20170237357 | APPARATUS AND METHOD FOR LOW FREQUENCY POWER INVERTER | 08-17-2017 |