Entries |
Document | Title | Date |
20080205109 | ENERGY DISTRIBUTION SYSTEM FOR VEHICLE - An electric power distribution system configured to facilitate transferring energy between an energy source and load. The distribution system may be configured or otherwise adapted to invert DC energy to AC energy when driving the load and to invert AC energy to DC energy when regenerating the energy source. | 08-28-2008 |
20080212348 | Method for Operating an Inverter and Arrangement for Executing the Method - There is described a method for operating an electronically controlled inverter. The inverter is controlled during the positive half-wave of the output alternating voltage in such a way that it operates as a SEPIC converter, and during the negative half-wave of the output alternating voltage in such a way that it operates as a CUK converter. | 09-04-2008 |
20080285321 | DC-AC Converter and Method of Supplying AC Power - A dc-ac converter capable of supplying a finely regulated ac drive voltage to a load is provided. For this purpose, the converter includes, in a primary winding of a transformer, a full-bridge or half-bridge type semiconductor switch circuit whose switches can be controlled by pulse-width modulation. Transformer has a secondary winding for connection with a load. Based on PWM signals and by use of adequate switching logics for controlling multiple semiconductor switches, sophisticated control including zero-current switching and penetrating current prevention can be effected. Moreover, by means of regulated burst control of the ratio of on-duty period to off-duty period together with pulse-width modulation control, power supplied to the load can be regulated over a wide range beyond the limits of control obtained by the pulse-width modulation. | 11-20-2008 |
20080291712 | INTERLEAVED SOFT SWITCHING BRIDGE POWER CONVERTER - An interleaved soft switching bridge power converter comprises switching poles operated in an interleaved manner so as to substantially reduce turn-on switching losses and diode reverse-recovery losses in the switching pole elements. Switching poles are arranged into bridge circuits that are operated so as to provide a desired voltage, current and/or power waveform to a load. By reducing switching turn on and diode reverse recovery losses, soft switching power converters of the invention may operate efficiently at higher switching frequencies. Soft switching power converters of the invention are well suited to high power and high voltage applications such as plasma processing, active rectifiers, distributed generation, motor drive inverters and class D power amplifiers. | 11-27-2008 |
20080304301 | Power Converting Apparatus For System Connection - A grounding wire from a commercial power system is connected to a series-connection end of a series connection between two capacitors connected in series between a positive electrode and a negative electrode. A current detector monitors an output current of an inverter unit in which four switching elements and two diodes convert voltages at both ends of the series circuit of the capacitors at three levels. An operation control circuit controls a generation of a PWM signal to be applied to the four switching elements, to minimize a difference between a current value detected by the current detector and a target current value. | 12-11-2008 |
20080304302 | Systems and Methods for Controlling a Converter for Powering a Load - Systems and methods for controlling a converter for powering a load are provided. According to one embodiment of the invention, a method for powering a load is provided. A power converter may be provided. At least one gating control signal having a switching pattern may be supplied to the power converter, wherein the switching pattern has a waveform with an effective switching frequency greater than 1 times the fundamental frequency of the switching pattern and less than 2 times the fundamental frequency of the switching pattern. At least one output power signal may be output to the load responsive at least in part to the at least one gating control signal supplied. | 12-11-2008 |
20090016091 | Circuit and system for ultrasonic power regulation - A circuit for power regulation of ultrasonic generators comprising a half bridge or full bridge circuit and a regulator circuit that controls or regulates the output power of the bridge circuit by, among other things, subtracting bridge voltage from the +VDC power supply. A full range of bridge circuit output powers are efficiently produced by varying the duty cycle of the drive signal to the switching device in the regulator circuit. | 01-15-2009 |
20090027935 | Polyphase Inverter, Control Method Thereof, Air Sending Device and Polyphase Current Output System - Capacitors act as bootstrap capacitors of a high side control circuits. The capacitors are charged in a period in which all of high arm switching devices are non-conductive, so-called in a precharge period. When any of U-phase current, V-phase current and W-phase current is smaller than a negative predetermined value (when an absolute value is larger), it is judged which is the largest value. The low arm switching device is turned on only for a phase corresponding to the current of the largest value and the low arm switching devices of other phases are turned off. | 01-29-2009 |
20090027936 | RF POWER SUPPLY - An RF power supply, in particular a plasma supply device, for generating an output power greater than 500 W at an output frequency of at least 3 MHz includes at least one inverter connectable to a DC power supply, which inverter comprises at least one switching element and an output network. An accompanying line connects an electrical component to the inverter by a lead-in of the output network. | 01-29-2009 |
20090052216 | LEVEL SHIFT CIRCUIT AND POWER SUPPLY DEVICE - In a level shift circuit including: an inverter circuit having a series circuit of a Pch-type transistor and an Nch-type transistor, which re connected between electrodes of a floating power supply; and a transistor Q | 02-26-2009 |
20090059634 | Switching power supply - To provide a half-bridge switching power supply using a series resonance that can realize both of a smaller size and higher reliability of a device. | 03-05-2009 |
20090097292 | ON-BOARD VEHICLE POWER - A modular vehicle power system for a vehicle, the modular vehicle power system obtaining DC power the vehicle and producing AC power and method therefore. A plurality of power modules, each of the plurality of power modules receiving the DC power from the vehicle and producing the AC power, wherein each of the plurality of power modules are independent and interchangeable. | 04-16-2009 |
20090135636 | ELECTRIC POWER CONVERSION SYSTEM - An electric power conversion system including a direct current power supply, plural main circuit switching devices bridge-connected to convert the direct current to alternating current, including free wheeling diodes connected in reverse parallel thereto, respectively, and a reverse voltage application circuit applying a reverse voltage smaller than the direct current power supply to each free wheeling diode, upon cutoff of back-flow current of the free wheeling diode. The reverse voltage application circuit includes in series connection a low-voltage direct current power supply having a voltage lower than the direct current power supply, a reverse voltage application switching device having holes as a majority current and a lower withstand voltage than the main circuit switching devices and adapted to turn on upon reverse recovery of the free wheeling diode, and an auxiliary diode having a shorter reverse recovery time than the free wheeling diode. | 05-28-2009 |
20090196082 | Multiphase Converter Apparatus and Method - An ac/ac converter for accepting a pulsating dc input with encoded sinusoidal modulation and providing a multiphase modulated output. The converter comprises a bridge including a plurality of switches having switch legs for modulating the pulsating dc input at a carrier frequency over a plurality of phases. The bridge is coupled at one end to a pulsating dc source and coupled at another end to a modulated signal output. A controller is provided for the plurality of switches for causing, for each of the plurality of phases, under unity power factor, one of the switch legs to modulate the pulsating dc input at the carrier frequency while the other switch legs do not modulate the pulsating dc input at the carrier frequency. | 08-06-2009 |
20090201708 | SEMICONDUCTOR MODULE - A semiconductor module has switching semiconductor elements connected in parallel to each other and at least a free wheeling semiconductor element reversely connected in parallel to the switching semiconductor elements. The free wheeling semiconductor element is placed between the switching semiconductor elements. At both end parts of the semiconductor elements, each of the switching semiconductor elements is placed. A longitudinal side of each of the switching semiconductor elements and the free wheeling semiconductor element is placed in parallel to a short side of the semiconductor module. An electric-power conversion device has a plurality of arms. Each arm is composed of the semiconductor elements. | 08-13-2009 |
20090251938 | Inverter Circuit and Method for Operating the Inverter Circuit - An inverter circuit having a primary circuit with a first choke for periodically connecting a primary winding to a DC voltage present at an input of the inverter circuit, a secondary circuit with a secondary winding, the secondary winding arranged in series with a first capacitor and connected via a full bridge consisting of four switching elements to a AC voltage present at an output of the inverter circuit via a second choke, and a transformer, wherein the primary circuit and the secondary circuit are electrically isolated by the transformer. | 10-08-2009 |
20090279337 | LOAD DRIVE DEVICE AND VEHICLE EQUIPPED WITH THE SAME - A surge voltage generated by the switching operation of an IGBT element and voltage variation generated in an equivalent series resistance of a capacitor are superimposed on an input voltage of an inverter. The equivalent series resistance has a temperature dependence that a resistance value increases with a decrease in a capacitor temperature. The IGBT element has a temperature dependence that an element withstand voltage decreases with a decrease in an inverter temperature. When capacitor temperature is lower than a predetermined threshold value, a control device reduces an upper limit value of the input voltage by an amount corresponding to the voltage variation from its upper limit value at a high temperature, and controls a target voltage of a boost converter such that an output voltage does not exceed the upper limit value. Consequently, the allowable range of the surge voltage can be ensured. | 11-12-2009 |
20090285005 | SPACE-SAVING INVERTER WITH REDUCED SWITCHING LOSSES AND INCREASED LIFE - The invention relates to an inverter, and in particular a solar inverter. According to the invention, the inverter has a step-up converter ( | 11-19-2009 |
20090290398 | POWER CONVERTER - A power converter includes a switching device composed of parallel-connected semiconductor chips evenly divided into two groups. The power converter includes a positive conductor, a capacitor and an output electrode. The positive conductor includes first and second terminal portions. The output electrode includes an end portion joined to a base portion having first and second connecting portions. The output electrode is formed so as to reduce or cancel a difference existing between an inductance L | 11-26-2009 |
20090316458 | SINGLE-PHASE INVERTER CIRCUIT TO CONDITION AND TRANSFORM DIRECT CURRENT ELECTRIC POWER INTO ALTERNATING CURRENT ELECTRIC POWER - The invention presents a structure for the conversion of direct current electric power into alternating current electric power, characterised in that it is simple, highly efficient and minimises the problem of electromagnetic compatibility. The circuit includes, in its first preferred embodiment, six switching elements governed by a command unit, four switches forming an H-bridge (T | 12-24-2009 |
20100008119 | SOLAR POWER GENERATION STABILIZATION SYSTEM AND METHOD - A power generation system including a photovoltaic (PV) module to generate DC power is provided. The system includes a combination of a DC to DC converter and a DC to AC converter coupled to the DC to DC converter for supplying power from the PV module to a power grid. The system further includes a bidirectional converter and an energy storage device coupled to the bidirectional converter. The system also includes a control system to generate commands for controlling a state of charge of the energy storage device. The control system comprises a deadband limiter to detect a deviation of the frequency signal outside of a respective signal range, a power shaper to provide a transient power generation adjustment signal in response to the signal being outside of the respective signal range and a limit controller for preventing the adjustment signal from causing the energy storage device to operate outside of at least one operating constraint. | 01-14-2010 |
20100014335 | THREE-PHASE POWER CONVERTING APPARATUS - A three-phase inverter circuit ( | 01-21-2010 |
20100014336 | DC-AC Converter and Method of Supplying AC Power - A dc-ac converter capable of supplying a finely regulated ac drive voltage to a load is provided. For this purpose, the converter includes, in a primary winding of a transformer, a full-bridge or half-bridge type semiconductor switch circuit whose switch can be controlled by pulse-width modulation. Transformer has a secondary winding for connection with a load. Based on PWM signals and by use of adequate switching logics for controlling multiple semiconductor switches, sophisticated control including zero-current switching and penetrating current prevention can be effected. Moreover, by means of regulated burst control of the ratio of on-duty period to off-duty period together with pulse-width modulation control, power supplied to the load can be regulated over a wide range beyond the limits of control obtained by the pulse-width modulation. | 01-21-2010 |
20100020581 | POWER CONVERSION COMPONENTS, SYSTEMS AND METHODS - Components, systems and methods for generating variable frequency AC voltage from a DC power supply are described. The components include a fullbridge (FB) parallel load resonant (PLR) converter which operates in discontinuous conduction mode. The PLR converter includes MOSFETs in an H-bridge configuration and employs a topology which minimizes inductance. The PLR converter can be coupled to a single or poly-phase bridge for use as an inverter. The inverter can be used to produce an AC sinusoidal waveform from a low voltage, high current DC power supply. Systems and techniques for modulating the output from the PLR converter to produce an AC sinusoidal waveform having desired characteristics, including frequency and voltage, are also provided. The PLR converter can also be coupled to a rectifier for use as a DC-DC converter. | 01-28-2010 |
20100027306 | PRIMARY RESONANT INVERTER CIRCUIT FOR FEEDING A SECONDARY CIRCUIT - A primary circuit ( | 02-04-2010 |
20100034002 | Interleaved soft switching bridge power converter - An interleaved soft switching bridge power converter comprises switching poles operated in an interleaved manner so as to substantially reduce turn-on switching losses and diode reverse-recovery losses in the switching pole elements. Switching poles are arranged into bridge circuits that are operated so as to provide a desired voltage, current and/or power waveform to a load. By reducing switching turn on and diode reverse recovery losses, soft switching power converters of the invention may operate efficiently at higher switching frequencies. Soft switching power converters of the invention are well suited to high power and high voltage applications such as plasma processing, active rectifiers, distributed generation, motor drive inverters and class D power amplifiers. | 02-11-2010 |
20100085789 | Voltage Drive System With Hysteretic Current Control And Method Of Operating The Same - A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator receives a phase current error and has an adder which generates a modulated phase current error based on the phase current error and based on a signal having a phase. For each respective modulator, the phase of the respective signal is different. Each respective modulator changes a respective gate input when the respective modulated phase current error changes from being within a predetermined current range to being outside of the predetermined current range. Each respective switching circuit receives the respective gate input and generates a respective output terminal voltage based on the respective gate input. The change in the respective gate input effectively causes a switching event of the respective switching circuit. | 04-08-2010 |
20100103711 | Uninterruptible power supply and method for tripping thereof - Performance failure in an uninterruptible power supply (UPS) is determined independently by itself. A selective tripping can be done within a shorter time than one cycle of an AC output. A UPS converts a DC voltage to an AC voltage and supplies the AC voltage to a load device. A UPS has a control unit conducting a failure determination by using an instantaneous value of an internal voltage and current. It is preferred that a UPS includes an inverter unit and a trip switch. The inverter unit includes a semiconductor bridge circuit generating a sinusoidal AC voltage by modulating a DC voltage with voltage instruction values, and a filter circuit inserted between the semiconductor bridge circuit and the load device. The trip switch connects and trips a connection between the inverter unit and the load device according to the failure determination of the control unit. | 04-29-2010 |
20100110742 | BIPOLAR DC TO AC POWER CONVERTER WITH DC GROUND FAULT INTERRUPT - An electrical power converter for converting power from a bipolar DC source to supply an AC load is disclosed. For one such embodiment the bipolar DC source is a photovoltaic array and the AC power is sourced into an electric power grid. The bipolar photovoltaic array has positive and negative voltage potentials with respect to earth ground. The converter is a utility interactive inverter which does not require an isolation transformer at the electric power grid interface. Embodiments of the invention include methods of detecting and interrupting DC ground faults in the photovoltaic array. | 05-06-2010 |
20100110743 | INVERTER CONTROLLER - To suppress an unbalance of a dwell period in a changeover of phases in which switching is dwelled in an inverter controller. A PWM operation unit | 05-06-2010 |
20100135054 | INVERTER FOR FEEDING ELECTRIC ENERGY INTO A POWER SUPPLY SYSTEM - An inverter ( | 06-03-2010 |
20100142240 | N-PHASE FULL BRIDGE POWER CONVERTER - An N-phase full bridge power converter, comprising: a load device; a plurality of bridge legs, each being composed of two power switches; a plurality of transformers, each being coupled between two nodes each disposed between two power switches in two adjacent bridge legs on its primary side and coupled to the load device on its secondary side; and a plurality of inductors, each being connected between a node and the primary side of one of the transformers corresponding thereto. | 06-10-2010 |
20100149846 | INVERTER CIRCUIT HAVING RELATIVELY HIGHER EFFICIENCY - The configurations of an inverter circuit are provided in the present invention. The proposed circuit includes a first bridge arm having a first sub-bridge arm with a first switch and a first middle point coupled to the first switch, and a second sub-bridge arm with a second switch and a second middle point coupled to the second switch, a first inductor having a first terminal coupled to the first middle point and a second terminal, and a second inductor having a first terminal coupled to the second middle point, and a second terminal coupled to the second terminal of the first inductor and outputting an AC voltage. | 06-17-2010 |
20100157639 | Inverter Comprising Normally Conductive Gate-Controlled Semiconductor Switches - An inverter comprises two input lines; an inverter bridge connected between the input lines and including at least one half-bridge comprising two normally conductive gate-controlled semiconductor switches; a controller which supplies control voltages to the gates of the semiconductor switches in an operative state of the inverter; and a DC voltage source for supplying an auxiliary control voltage to the gates of the semiconductor switches in an inoperative state of the inverter so as to hold the inverter bridge in a non-conductive state between the input lines. The DC voltage source has a charging unit connected between the input lines in series with a further normally conductive gate-controlled semiconductor switch, o and charging a storage unit for electric charge, which is connected to the gate of the further semiconductor switch such that this switch becomes non-conductive, when the storage unit has been sufficiently charged for providing the auxiliary control voltage. | 06-24-2010 |
20100157640 | Electric Power Converter - The present invention provides a highly reliable electric power converter reduced in parasitic inductance. | 06-24-2010 |
20100165687 | OUTPUT INVERTER FOR SINGLE PHASE AND OUTPUT CURRENT DETECTING METHOD THEREOF - There are provided an output inverter for single phase which can detect a current with high precision through a smaller number of components, and an output current detecting method thereof. A first current detector ( | 07-01-2010 |
20100195361 | Photovoltaic power plant with distributed DC-to-DC power converters - A solar photovoltaic plant is disclosed where a number of distributed DC-to-DC converters are used in conjunction with a central DC-to-AC converter. Each DC-to-DC converter is dedicated to a portion of the photovoltaic array and tracks the maximum power point voltage thereof. The DC-to-DC converters also boost the photovoltaic voltage and regulate a DC output current for transmission to the central DC-to-AC converter. Five distinct advantages are had over the prior art. First, efficiencies in intra-field power collection are greatly improved by transferring power at higher DC voltages. Second, the number of independent photovoltaic maximum power point trackers in the power plant can be increased, in a cost effective manner, to optimize the overall photovoltaic array energy harvest. Third, each DC-to-DC converter output “looks” like a current source at the input of the DC-to-AC converter and therefore can be easily paralleled. Fourth, the current source nature of the DC-to-DC converter outputs enables the DC-to-AC converter to operate with a minimum, fixed DC bus voltage to provide maximum DC-to-AC power conversion efficiencies. And fifth, each distributed DC-to-DC converter can isolate a faulted portion of the photovoltaic array while the remainder of the array continues producing power. | 08-05-2010 |
20100226158 | ELECTRIC POWER CONVERTER APPARATUS ENABLING REDUCTION OF TEMPERATURE DIFFERENCES AMONG A PLURALITY OF SEMICONDUCTOR MODULES OF THE APPARATUS - An electric power converter apparatus includes a plurality of semiconductor modules connected in parallel, with respective current-carrying electrode terminals of the modules being connected to a common branch point via connecting leads having respectively different values of impedance, such that the impedance values decrease in accordance with increased degrees of effectiveness of cooling the respective semiconductor modules, thereby reducing variations in operating temperature between the modules. | 09-09-2010 |
20100226159 | Very High Efficiency Three Phase Power Converter - A DC-to-AC power converter is disclosed which provides current regulated three-phase AC outputs and very high conversion efficiencies. The converter sinks power from an external DC current source and steers that current directly into two phases of a three-phase load by using complementary semiconductor switches in disparate half-bridges of a six-pole bridge. The steering switch selection rotates every 60° to direct current into the two phases with the largest voltage differential at any given time. The remaining half-bridge acts as a high-frequency, bi-directional current source to balance the three-phase load currents. This topology and control method significantly reduces power conversion losses. The converter may also include an additional power processing stage that is used to convert an external DC voltage source to a DC current source before the three-phase conversion takes place. Prior art converters first convert “soft” DC sources to voltage sources and then to AC current sources. The invention eliminates the need for large PWM filter inductors and DC bus capacitors used in prior art converters. In addition, 90% of the power being converted is directly processed by steering current into the AC three-phase load without high frequency chopping or switching. The invention is optimized for photovoltaic, utility-grid-interactive applications. | 09-09-2010 |
20100226160 | Power Generation System and Inverter for Feeding Power Into a Three-Phase Grid - A power generation system for feeding electrical power from a generation unit into a three-phase grid via three AC terminals is disclosed. The system includes a relay arrangement for disconnecting the system from the grid having at least three relays. Each of the three relays includes a control coil and two switching contacts operated by the corresponding control coil. Each of the AC terminals is connectable to the grid via a first and a second switching contact, each of which is assigned to a different one of the relays. Further disclosed are a relay arrangement and an inverter with a relay arrangement. | 09-09-2010 |
20100246231 | ACHIEVING ZVS IN A TWO QUADRANT CONVERTER USING A SIMPLIFIED AUXILIARY CIRCUIT - A zero voltage switch half bridge converter comprises a first and second diode series diodes, parallel with a voltage source. A first terminal of an inductor is joined to the diode junction. A first semiconductor auxiliary switch connected in series between the voltage source and a third diode, which is in series with a fourth diode connected to a second semiconductor auxiliary switch. First and second semiconductor main switches are connected in series and in parallel with the voltage supply. A capacitive voltage divider connected across the voltage source, wherein a second terminal of the inductor is connected to junction of the main switches and a midpoint of the capacitive voltage divider. A control circuit is configured to provide respective control signals to at least the first semiconductor auxiliary switch and the second semiconductor auxiliary switch. | 09-30-2010 |
20100254172 | PWM SIGNAL GENERATOR, AND INVERTER EQUIPPED WITH THIS PWM SIGNAL GENERATOR - The PWM signal generator of the present invention generates a first pulse waveform in which a first on-time ΔT | 10-07-2010 |
20100265747 | SINGLE STAGE INVERTER DEVICE, AND RELATED CONTROLLING METHOD, FOR CONVERTERS OF POWER FROM ENERGY SOURCES, IN PARTICULAR PHOTOVOLTAIC SOURCES - The present invention concerns a single stage inverter device for power converters, comprising switching means (M | 10-21-2010 |
20100271853 | CONTROLLER OF POWER CONVERTER - A controller of a power converter including an inverter that includes plural semiconductor switching elements. The controller suppresses an error between a voltage command and an inverter output voltage and responds to a voltage command at a high speed. The controller includes a voltage command generator that generates a voltage command signal and a switching pattern calculator that calculates and outputs, based on the voltage command signal, a switching pattern of a synchronous PWM system in which an average value of an inverter output voltage matches the voltage command signal. | 10-28-2010 |
20100296325 | Power Converting Device - A power converting device converts a DC voltage input from an external power source into an AC voltage output across an output capacitor of an output circuit, and includes a coupling circuit having series first and second windings. A rectifying diode has a grounded anode coupled to an anode of a clamp diode, and a cathode coupled to the second winding. A cathode of the clamp diode is coupled to a clamp switch and the first winding. A full-bridge circuit includes a first series connection of first and second switches, and a second series connection of third and fourth switches. The first and second series connections are coupled in parallel between the first winding and ground. The output capacitor is coupled between a first common node between the first and second switches, and a second common node between the third and fourth switches. | 11-25-2010 |
20110007537 | Method and apparatus for single-path control and monitoring of an H-bridge - A method and apparatus for controlling and monitoring an H-bridge via a single communication path. The apparatus comprises a first control and monitor module coupled to a first switch within the H-bridge; and a first pulse transformer coupled to a first control signal to the first control and monitor module, wherein the first control and monitor module (i) generates, based on the first control signal, a first driver signal for operating a first switch of the H-bridge during DC/AC power conversion, (ii) monitors at least a portion of the H-bridge for at least one fault, and (iii) communicates, upon detecting the at least one fault, a first fault indication to a main controller of the H-bridge via the first pulse transformer. | 01-13-2011 |
20110019454 | Drive Circuit - The present invention relates to a DC to AC inverter comprising a plurality of voltage controlled switching devices, where one or more of the voltage controlled switching devices is driven by a drive circuit comprising: a bridge switching circuit ( | 01-27-2011 |
20110096579 | DC BUS VOLTAGE CONTROL FOR TWO STAGE SOLAR CONVERTER - Systems, methods, and apparatus for supplying AC power to an AC power grid from a DC power source, such as a photovoltaic (PV) array are disclosed. The systems and methods can include a converter coupled to the DC power source that provides DC power to a DC bus at a DC bus voltage. The systems and methods can further include an inverter coupled to the DC bus for converting the DC power of the DC bus to an output AC power. The systems and methods can further include a control system configured to regulate the DC bus voltage of the DC bus to operate at a variable DC bus voltage setpoint. The control system can adjust the DC bus voltage setpoint based at least in part on the DC bus voltage and the output AC current of the inverter. | 04-28-2011 |
20110096580 | VOLTAGE SOURCE CONVERTER - A Voltage Source Converter of M2LC-type has a series connection of switching cells ( | 04-28-2011 |
20110096581 | Inverter and method for operating the inverter - An inverter for converting a DC input voltage to an AC output voltage with an H-bridge is provided. A storage choke circuit is provided between the H-bridge and output-side AC voltage terminals. The storage choke circuit includes a freewheeling path with a freewheeling diode for commutating the current after a turn-off process of a semiconductor switch of the H-bridge. In this arrangement, each switching semiconductor switch is coupled to a resonant circuit which contains capacitive resonant elements and inductive resonant elements. The freewheeling path includes first and second freewheeling diodes connected in parallel, wherein the parallel circuit is connected in series with the inductive resonant elements and the second freewheeling diode is connected in series with capacitive freewheeling elements which are charged to a corresponding voltage at the start of a freewheeling phase as elements of the resonant circuit for zero voltage switching of the second freewheeling diode. | 04-28-2011 |
20110103117 | GRID INTERCONNECTION INVERTER AND GRID INTERCONNECTION DEVICE - A grid interconnection inverter includes: a voltage conversion circuit configured to output an intermediate voltage by raising or lowering an input voltage from a direct current power source; and a waveform conversion circuit configured to convert the intermediate voltage into a alternating current power in a sine waveform shape. The voltage conversion circuit includes: a positive-side circuit arranged on a positive-side line between a positive polarity of the direct current power source and the waveform conversion circuit; and a negative-side circuit arranged on a negative-side line between a negative polarity of the direct current power source and the waveform conversion circuit. The positive-side circuit and the negative-side circuit have circuit configurations symmetric to each other. | 05-05-2011 |
20110103118 | NON-ISOLATED DC-DC CONVERTER ASSEMBLY - A non-isolated DC-DC converter assembly includes a boost converter and a Ćuk converter connected together in a specific way. The non-isolated DC-DC converter assembly allows for grounding of a source and load at the same time, and provides a complete adjustability of the output voltage of the non-isolated DC-DC converter. Further, the DC-DC converter assembly of the disclosure has a current source input characteristic, whereby the current absorbed from the power supply is continuous | 05-05-2011 |
20110110138 | Methods and Systems for Phase Current Reconstruction of AC Drive Systems - Methods and systems for phase current reconstruction are disclosed. An example method comprises: sampling a current from a power stage comprising: three phase legs, a current sensor to measure a dc-link current, and three more current sensors configured to measure three summations of currents for the power stage, storing the sampled current into a current stack if the sampled current comes from a survived sensor and is one of the phase currents from the switching state in the state stack, and reconstructing an unknown phase current by using the previously stored currents along with the sampled current to calculate the unknown phase current. Other embodiments are described and claimed. | 05-12-2011 |
20110116293 | POWER CONVERSION EQUIPMENT - In a power conversion device, a capacitor series circuit is connected in parallel with a direct current power supply, outputs an alternating current voltage having three or more potentials in a half-cycle period with the capacitor series circuit as a direct current input, wherein a neutral point of an alternating current load and an intermediate connection point of the capacitor series circuit are directly connected, the voltage of each of the capacitors is detected, and a zero voltage vector obtained by making each alternating current output of the same potential is adjusted in accordance with the difference between the voltages. | 05-19-2011 |
20110116294 | Method, Circuit Configuration and Bridge Circuit - A method, circuit configuration and bridge circuit for charging a capacitance effective on the main current terminals of a semiconductor switch, in particular an intrinsic capacitance, in particular the drain-source capacitance of a MOSFET semiconductor switch or the collector-emitter capacitance of an IGBT semiconductor switch, the precharging, in particular the at least partial charging, of the effective capacitance being forcibly controlled via a charging current path. | 05-19-2011 |
20110157948 | CURRENT SOURCE INVERTER - A current source inverter includes an inverter having arm units and AC terminals, the numbers of the arm units and AC terminals being adapted to an AC load connected to the AC terminals. An upper arm is connected between a positive DC terminal and the corresponding AC terminal and has an upper arm switch Q | 06-30-2011 |
20110157949 | Highly Efficient III-Nitride Power Conversion Circuit - According to an exemplary embodiment, a III-nitride power conversion circuit includes a gate driver having a plurality of cascaded inverters, each of the plurality of cascaded inverters including at least one III-nitride transistor. At least one of the plurality of cascaded inverters has a cutoff switch and a III-nitride depletion mode load where the cutoff switch is configured to disconnect the III-nitride depletion mode load so as to prevent current from flowing from a supply voltage of the at least one of the plurality of cascaded inverters. The cutoff switch of the at least one of the plurality of cascaded inverters can be driven by one of the plurality of cascaded inverters. The III-nitride power conversion circuit can also include an output driver driven by the gate driver where the output driver has a segmented III-nitride transistor. Furthermore, a selector circuit can be configured to selectively disable at least one segment of the segmented III-nitride transistor. | 06-30-2011 |
20110164443 | Method And System For Controlling A Power Converter System Connected To A DC-BUS Capacitor - A method and system for controlling a power converter system with first, second, and third phase legs with respective first, second, and third associated phase currents determine direction of current flow in at least two phase legs and switch states of the power converter system in response to the current flow directions to reduce ripple current in a connected direct current (DC)-bus capacitor. | 07-07-2011 |
20110170326 | METHOD FOR CONTROLLING A CONVERSION STRUCTURE FOR CONVERTING DIRECT CURRENT TO ALTERNATING CURRENT - The invention relates to a control method applicable to structures for converting direct current/alternating current, dc/ac, especially for photovoltaic systems. The control method according to the invention enables the switching losses of the semiconductors to be reduced, thereby improving the efficiency of the conversion structure. The invention can also be applied to other fields of energy, such as the generation of energy by means of electrochemical cells or wind energy. | 07-14-2011 |
20110176343 | POWER CONVERTING APPARATUS - A power converter stabilizes a voltage by controlling leading of an AC current and performs maximum charging within contracted power reception amount when connected to a weak power system. The power converter comprises Magnetic Energy Recovery Switch comprising a bridge circuit including at least two reverse conductive type semiconductor switches and a magnetic energy accumulating capacitor with a small capacity connected between DC terminals of the bridge circuit. The power converter uses the Magnetic Energy Recovery Switch to perform power conversion from AC to DC or vise versa. Plurality of secondary battery charging devices each comprising the power converter have a DC part connected to a common DC bus bar, so that power is accommodated among the secondary battery charging devices. | 07-21-2011 |
20110182097 | Pulse Width Modulation Step Wave And Sine Wave Driving Device - A PWM step wave and sine wave driving device is provided. The driving device includes an ADC unit, an input processing unit, a first pulse width calculation unit, a register unit, a first output unit, a zero point detecting unit, a second pulse width calculation unit, a second output unit, and a multiplexer output unit. The driving device receives input signals, and output desired step wave or sine wave driving signals for driving an external electric device. The driving device detects a point of zero voltage of the system power supply by the zero point detecting unit. When the system power supply is abnormal, the first output unit outputs predetermined PWM step wave output signals, or the second output unit outputs predetermined PWM sine wave output signals. In such a way, the external electric device can be maintained for regular operation, so that the malfunction or breakdown thereof is prevented. | 07-28-2011 |
20110188278 | Electron avalanche drive circuit - Disclosed herein is an electron avalanche drive circuit whereby electron avalanche is produced in a high voltage spark gap exposed to open air or other suitable gaseous medium. The electrochemical process of electron avalanche produces additional current that is delivered to an inductive load. | 08-04-2011 |
20110205773 | METHOD AND SYSTEM TO ALLOW FOR HIGH DC SOURCE VOLTAGE WITH LOWER DC LINK VOLTAGE IN A TWO STAGE POWER CONVERTER - A system for supplying AC power from a DC power source, such as a photovoltaic array is disclosed. The system includes a converter and an inverter coupled by a DC link. Control methods and systems are provided to maintain the DC source voltage and the DC link voltage below the open-circuit voltage of the DC power source. During steady state conditions, the DC source voltage and the DC link voltage are maintained below the open-circuit voltage of the DC power source by controlling the output of the inverter. The DC link voltage is temporarily adjusted to allow for higher DC link transients when the DC power source is first coupled or re-coupled to the system. During conditions when the inverter is decoupled from the system, the converter is controlled to maintain the DC link voltage below the open-circuit voltage of the DC power source. | 08-25-2011 |
20110211381 | POWER CONVERTING APPARATUS - A neutral point clamped three-phase three-level inverter is connected to a first DC power supply and single-phase inverters are connected in series with AC output lines of individual phases of the three-phase three-level inverter such that sums of output voltages of the three-phase three-level inverter and output voltages of the respective single-phase inverters are output to a load through a smoothing filter. An output control unit controls the three-phase three-level inverter so that the individual phases of the three-phase three-level inverter output primary voltage pulses at a rate of one pulse per half cycle and controls the individual single-phase inverters by PWM, so that output voltages to the individual phases of the load form sine waves of which phases are offset by 2π/3 from one phase to another, the sine waves having the same peak value. | 09-01-2011 |
20110216568 | SYSTEM INTERCONNECTION INVERTER - The present invention includes: an inverter | 09-08-2011 |
20110222326 | VARIABLE DUTY CYCLE SWITCHING WITH IMPOSED DELAY - Power conversion methods, systems, articles of manufacture, and devices are provided. The power conversion may include converting between direct current and alternating current wherein switching losses associated with latent electrical charges are reduced. Current sensing may be low-side bus reference. Solid-state implementations, code implementations, and mixed implementations are provided. | 09-15-2011 |
20110228578 | NON-ISOLATED DC-DC CONVERTER FOR SOLAR POWER PLANT - An exemplary non-isolated DC-DC converter for a solar power plant, can be adapted to connect to a full-bridge inverter. The converter includes positive and negative input terminals, and positive and negative output terminals. A plurality of switches, diodes, inductors and capacitors are connected in a circuit configuration to the input and output terminals. A control means is connected to the circuit for controlling the switching of a first, second, and third switch between an open and closed state. | 09-22-2011 |
20110235384 | POWER CONVERTER AND POWER CONDITIONER - A power converter enhances conversion efficiency from DC power to AC power. A first chopper circuit chops DC voltage from a photovoltaic panel at a system frequency producing a first square-wave whose voltage level changes positively. A second chopper circuit chops the first square-wave at a frequency double the system frequency producing a second square-wave whose voltage level changes negatively and adds the first square-wave and the second square-wave to produce a third square-wave that changes positively and negatively in a sine-wave manner. A third chopper circuit charges and discharges by chopping the third square-wave at a third frequency fixed by timing according to a difference between the third square-wave and a sine-wave voltage. PWM control is performed on the charge and discharge outputs such that the difference is corrected, producing a sine-wave voltage that continuously changes positively and negatively. A spike noise of an output voltage is suppressed. | 09-29-2011 |
20110249479 | METHOD OF CONTROLLING AN INVERTER OF NPC TYPE - The invention relates to a method of controlling a multilevel inverter of NPC (Neutral Point Clamped) type. The method consists in particular in regulating the electrical potential of the mid-point when the inverter operates at full voltage, that is to say in overmodulation. In this case, the method firstly consists in determining the position of the control voltage vector (U) in one of the six identical triangles covering the hexagonal vector space and thereafter in decomposing the control voltage vector (U) in the triangle by taking account of the control combinations, defined in this triangle, for the switching arms. | 10-13-2011 |
20110255321 | RESONANT CAPACITOR CLAMPING CIRCUIT IN RESONANT CONVERTER - A resonant converter comprises a first and a second input terminal ( | 10-20-2011 |
20110267862 | SYSTEM AND METHOD FOR PROTECTION OF A MULTILEVEL CONVERTER - A three level neutral point clamped (NPC) converter includes a plurality of phase legs each having at least two inner switching devices, at least two outer switching devices, at least two clamping diodes, and a protection circuit. An inner component failure sensing circuit is employed in the protection circuit to detect a failure condition in any of the inner switching devices or clamping diodes. The protection circuit further includes a gating signal generation circuit configured to generate a turn ON signal for a respective outer switching device that is adjacent to the failed inner switching device or the clamping diode. | 11-03-2011 |
20110267863 | TRANSFORMERLESS INVERTER COMPRISING A DC/DC CONVERTER - A transformerless inverter that serves to feed electricity from a DC current source into an AC power grid, has an inverter bridge and a DC/DC converter connected upstream of the inverter bridge. The DC/DC converter converts an input DC voltage that is present between two input lines of the inverter into a DC link voltage present between two input lines of the inverter bridge. The inverter bridge converts the DC link voltage present at the input lines thereof into an output AC voltage. The DC/DC converter includes at least one resonant circuit that has a resonance inductance and a resonance capacitance and is connected on its input side via at least two clocked switches to one of the two input lines of the inverter or an intermediate potential line carrying a potential in between. The input lines of the inverter and the input lines of the inverter bridge are galvanically isolated from one another by a capacitive method. The resonant circuit may be undivided and is connected alternately to the two input lines of the inverter bridge. | 11-03-2011 |
20110286253 | Three-phase inverter circuit and method for operating a three-phase inverter circuit - A three-phase inverter circuit includes an inverter comprising a plurality of controllable power switches, and an electronic control device adapted to control the power switches. The control device in the event of a measured voltage drop on one phase is adapted to supply a reactive current on the phase with voltage drop and to supply and/or draw an active current on at least one phase without voltage drop. | 11-24-2011 |
20110299311 | Power Generation System, Power Converter System, And Methods Of Converting Power - A power converter system includes an inverter including a first bridge and a second bridge, wherein each of the first bridge and the second bridge includes at least one switch. The power converter system also includes an inductor including a first winding coupled to an output of the first bridge and a second winding coupled to an output of the second bridge. | 12-08-2011 |
20110299312 | INVERTER FOR SOLAR CELL ARRAY - A full-bridge, NPC inverter uses pulse width modulation (PWM) to convert the DC voltage from a solar panel array to an AC voltage at the output of the inverter that is acceptable for connection to a utility. The PWM control unit has a predetermined carrier frequency. The carrier unit uses for each carrier period either positive or negative values of a reference voltage to generate a predetermined number of signals to control the switching on and off of each of the eight inverter switching elements in a predetermined pattern for a predetermined period of the carrier frequency period to thereby produce the acceptable alternating current voltage at the inverter output and not produce between the inverter input and earth ground a carrier frequency component. | 12-08-2011 |
20120002454 | THREE-LEVEL INVERTER, POWER CONDITIONER, AND POWER GENERATING SYSTEM - A three-level inverter includes a set of series-connected capacitors connected in parallel to a direct-current power supply; two arms connected in parallel to an output of the direct-current power supply and each having an alternating-current output terminal; and a control section having a neutral voltage controller determining a three-phase voltage correction command based on a neutral voltage and voltage of the direct-current power supply, having a coordinate converter converting the three-phase voltage correction command to a voltage correction command on d-q axis, and suppressing voltage variations at the neutral point by correcting a voltage command on d-q axis based on the d-q voltage correction command. The neutral point is connected to one grounded phase of a three-phase grounded power system. The alternating-current output terminals are connected to respective non-grounded phases of the power system. A power conditioner includes the three-level inverter. A power generating system includes the power conditioner. | 01-05-2012 |
20120008359 | ASYMMETRIC ZERO-VOLTAGE SWITCHING FULL-BRIDGE POWER CONVERTERS - Disclosed are full-bridge power converters providing DC output power at increased conversion efficiencies, and methods of operating full-bridge power converters providing DC output power at increased conversion efficiencies. In disclosed embodiments, the switches of the full-bridge are operated to reduce conduction losses and to provide for zero-voltage switching. | 01-12-2012 |
20120014153 | SUPPLY CIRCUIT - The present invention relates to a supply circuit ( | 01-19-2012 |
20120020137 | POWER CONVERSION DEVICE - A single phase three-level power converter can include a first half bridge and a second half bridge. A half bridge operation is implemented in either the first half bridge or second half bridge when outputting a single phase alternating current voltage having an amplitude a half or less than that of a direct current input voltage, and also, by alternately switching between the bridges carrying out the half bridge operation. In certain configurations, the power converter can convert a direct current input voltage into alternating current phase voltages having three levels of potential, which are positive, negative, and intermediate voltages, by controlling on-off conditions of a plurality of switch elements, and a controller that, by supplying gate signals to the switch elements configuring the first half bridge and second half bridge, controls the related on-off conditions. | 01-26-2012 |
20120033476 | INVERTER CIRCUIT, POWER CONVERTER CIRCUIT, AND ELECTRIC VEHICLE - An object is to reduce, with the control circuit of the full-bridge inverter circuit, distortions in an output signal of the inverter circuit resulting from an error in control of the switching of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit. The pulse width of a signal that controls ON/OFF of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit is reduced, i.e., the duty cycle of the signal is reduced. This results in a reduction in short-circuit periods during which both the high-side transistor and the low-side transistor are on, thereby reducing distortions in a signal. | 02-09-2012 |
20120044731 | Method and Apparatus for Boosting DC Bus Voltage - A power converter includes at least two power conversion sections operating in parallel. The power converter receives a variable input power and generates an AC output voltage. When the power source is generating enough power to supply a DC voltage to the power converter greater than or equal to the peak magnitude of the desired AC voltage output, each power conversion section operates in parallel, converting the DC voltage to the desired AC voltage output. When the power generated by the variable power source results in a DC voltage having a magnitude less than the peak magnitude of the desired AC voltage output, the power conversion sections operate in series. One power conversion section operates as a boost converter to boost the DC voltage level to a suitable level for the second power conversion section, which generates the desired AC output voltage. | 02-23-2012 |
20120057387 | HYBRID SWITCH FOR RESONANT POWER CONVERTERS - A hybrid switch comprising two semiconductor switches connected in parallel but having different voltage drop characteristics as a function of current facilitates attainment of zero voltage switching and reduces conduction losses to complement reduction of switching losses achieved through zero voltage switching in power converters such as high-current inverters. | 03-08-2012 |
20120075900 | CONTROLLER FOR LOAD DRIVE SYSTEM - There is provided a controller for a load drive system which can reduce a ripple current which flows in a smoothing capacitor even when an inverter is PWM controlled with a two-phase modulation. | 03-29-2012 |
20120092915 | POWER CONVERSION APPARATUS - A power conversion apparatus including: a three-level inverter including bridge circuits each including a first semiconductor switching device and a second semiconductor switching device connected in series, the bridge circuits being connected to a positive terminal and a negative terminal of a DC power supply, and switch circuits having bidirectional characteristics and connected to respective AC output terminals of the bridge circuits which are the connection points between the first semiconductor switching devices and the second semiconductor switching devices, and to an intermediate potential point of the DC power supply; and single-phase inverters each including a plurality of semiconductor switching devices and respectively connected in series to the AC output terminals of the bridge circuits. The sum of an output voltage of the three-level inverter and output voltages of the single-phase inverters is supplied to a load. | 04-19-2012 |
20120106221 | ELECTRIC POWER CONVERTER APPARATUS - An electric power converter apparatus includes an inverter circuit having a plurality of upper arm elements and a plurality of lower arm elements, a feedback controlling module calculating a voltage command value in order to control an output from the inverter circuit in a feedback control manner and a compensating module compensating the voltage command value with a compensation amount and outputting a compensated voltage command value. Each of the plurality of upper arm elements and the plurality of lower arm elements is operated to switch over based on a control signal that is set according to the compensated voltage command value and a dead time. The compensation amount is set by the compensating module in order to compensate a fluctuation in the output current due to the dead time. | 05-03-2012 |
20120106222 | METHOD OF OPERATING AN INVERTER BY TURNING OFF THE SWITCHING AROUND A ZERO TRANSITION OF THE ALTERNATING OUTPUT CURRENT - A method of operating an inverter for converting direct voltage into alternating voltage. The inverter has direct-voltage terminals and alternating-voltage terminals and a plurality of power switching elements that are clocked at high-frequency connected between the d.c. and a.c. terminals. The high-frequency clocking of the power switching elements of the inverter is switched off around a zero transition of the alternating current or the alternating voltage for a period which depends on the direct voltage present at the direct-voltage terminals of the inverter and/or the output power of the inverter. No current is generated during time intervals with a poor efficiency. | 05-03-2012 |
20120113701 | INVERTER CURRENT MEASUREMENT USING A SHUNT RESISTOR - A method for determining each current output of a three-phase inverter ( | 05-10-2012 |
20120113702 | DC/DC CONVERTER WITH AUXILIARY CONVERTER FOR EARTH CURRENT COMPENSATION - A DC/DC converter for converting an input DC voltage between input lines into an output DC voltage between output lines includes: an AC current forward path connected via switching electric components to at least one of the output lines and at least one of the output lines; an AC current backflow path connected via same electric connections to at least one of the input lines and at least one of the output lines; and an auxiliary converter for compensating a sum of currents flowing via all forward and backflow paths, the auxiliary converter connecting one end of an compensation current path via two pulsed switches alternately to two lines at one side, the other end of the compensation path being connected to at least one line at the other side of the converter. The input lines are galvanically separated from the output lines by capacitances in all current paths. | 05-10-2012 |
20120127769 | Soft Switching Power Converters - Soft switching power converters are described. In one example, a grid tie solar power converter includes an input for receiving a direct current (DC) power input, an h-bridge coupled to the input, and an output coupled to the h-bridge. The h-bridge includes a plurality of power switches. The output includes a first output node and a second output node. The converter also includes a first output inductor coupled between the h-bridge and the first output node, a second output inductor coupled between the h-bridge and the second output node, and a soft switching circuit coupled to the first output inductor and the second output inductor. The soft switching circuit is configured to facilitate zero voltage switching of the plurality of switches of the h-bridge. | 05-24-2012 |
20120147641 | SWITCHING DEVICE - A switching device includes a flowing restriction element, a conductor and a snubber resistor. The flowing restriction element has an opening and closing function to open and close a flowing path of an electric current. The conductor is connected to the flowing restriction element. The snubber resistor is connected to the flowing restriction element and constitutes a snubber circuit. The snubber resistor is disposed along the conductor. | 06-14-2012 |
20120155140 | Asynchronous Sigma-Delta Modulation Controller - A constant-frequency asynchronous modulation apparatus includes a current feedback control unit connected to a constant-frequency asynchronous modulation unit. The current feedback control unit includes a reference signal generator and an error amplifier. The reference signal generator provides an error. The error amplifier is connected to a reference signal generator, and provides an error-compensating signal based on the error, and adds up a reference signal and the error-compensating signal to provide a compensation reference signal. The constant-frequency asynchronous modulation unit connected to the current feedback control unit, and includes a hysteresis comparator, an integrator connected to the hysteresis comparator, and a hysteresis boundary generator connected to both of the hysteresis comparator and the integrator. The hysteresis boundary generator provides a power source voltage, a time constant for the integrator, a switching frequency and a real-time reference signal so that a hysteresis boundary changes as the reference signal changes. | 06-21-2012 |
20120155141 | POWER CONVERTING APPARATUS, GRID INTERCONNECTION APPARATUS AND GRID INTERCONNECTION SYSTEM - A power converting apparatus is provided with an inverter circuit, an output short-circuiting circuit, and a control circuit. The inverter circuit comprises a first inverter switch and a second inverter switch. The output short-circuiting circuit comprises a first short-circuiting switch configured so as to short-circuit a power supply line that outputs a first polarity voltage, out of a pair of power supply lines, and a second short-circuiting switch configured so as to short-circuit a power supply line that outputs a second polarity voltage, out of the pair of power supply lines. Upon switching the polarity from the first polarity to the second polarity, the control circuit turns off the first short-circuiting switch before the timing whereby the second inverter switch is turned on. | 06-21-2012 |
20120170341 | METHOD AND APPARATUS FOR RESONANT POWER CONVERSION - A method and apparatus for providing multi-phase power. In one embodiment, the apparatus comprises a cycloconverter controller for determining a charge ratio based on a reference waveform; and a cycloconverter, coupled to the cycloconverter controller and to a multi-phase AC line, for selectively coupling an alternating current to each line of the multi-phase AC line based on the charge ratio. | 07-05-2012 |
20120176828 | Semiconductor Devices and Power Conversion Systems - A semiconductor device includes first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type that is formed near a surface of the first semiconductor layer; a first main electrode that is electrically connected to the second semiconductor layer; a third semiconductor layer of the second conductivity type that neighbors the first semiconductor layer; a fourth semiconductor layer of the first conductivity type that is selectively disposed in an upper portion of the third semiconductor layer; a second main electrode that is electrically connected to the third semiconductor layer and the fourth semiconductor layer; a trench whose side face is in contact with the third semiconductor layer and the fourth semiconductor layer; a gate electrode that is formed along the side face of the trench by a sidewall of polysilicon; and a polysilicon electrode. | 07-12-2012 |
20120195085 | FAST SWITCHING FOR POWER INVERTER - An apparatus includes an inverter including a high-side switch coupled to a low-side switch, the inverter generating a time-varying drive current from a plurality of drive control signals, a positive rail voltage, and a negative rail voltage wherein controlling the switches to generate the time-varying drive current produces a potential transitory overshoot condition for one of the switches of the inverter; a drive control, coupled to the inverter, to generate the drive control signals and to set a level of each of the rail voltages responsive to a plurality of controller signals; and a controller monitoring one or more parameters indicative of the potential transitory voltage overshoot condition, the controller dynamically adjusting, responsive to the monitored parameters, the controller signals to reduce a risk of occurrence of the potential transitory voltage overshoot condition. | 08-02-2012 |
20120195086 | Inverter With Commutation Circuit - An inverter provides alternating current (iout) to a load ( | 08-02-2012 |
20120212987 | POWER SUPPLY AND POWER CONTROL CIRCUITRY - A power supply can include a storage component or a storage unit including a capacitive element. In an embodiment, the power supply can include an electrical energy storage unit, a transformer, switching elements, and a pulse width modulation unit. In a particular embodiment, the power supply can be configured to provide an output voltage different from the voltage supplied by the electrical energy power storage unit. In another embodiment, the power supply can include storage components having electrodes connect to different printed circuit boards. In still another embodiment, the power supply can include an output anode, an output cathode, and an input electrode connected to the storage component. In a further embodiment, the power supply circuitry can include a transformer, switching elements, a pulse width modulation unit, and an output control units coupled to an output electrode, the pulse width modulation unit, or any combination thereof. | 08-23-2012 |
20120224403 | METHOD FOR CONTROLLING THREE-PHASE CURRENT CONVERTER - A method is for controlling a three-phase current converter. First, subtract a second reference current signal representing the predicted current of the three-phase terminals in the present switching cycle from a first reference current signal representing the predicted current of the three-phase terminals in the next switching cycle to obtain a predicted variation. Then, subtract a feedback current signal representing the feedback current of the three-phase terminals in the previous switching cycle from the second reference current signal delayed by one switching cycle to obtain a current error. Multiply the current error by an error coefficient then add the predicted variation to obtain a current variation. Finally, obtain duty ratios of a plurality of switches, according to the current variation and inductance of the first to the third inductor. The three-phase current converter converts electric power between a DC terminal and the three-phase terminals, according to the duty ratio. | 09-06-2012 |
20120230076 | VOLTAGE BALANCING - This invention generally relates to voltage balancing among series-connected power switching devices comprising one or more insulated gate bipolar transistor (IGBT), and more particularly to a method controlling sharing of voltage among series-connected power switching devices, wherein at least one said device is an insulated gate bipolar transistor (IGBT), the method comprising: controlling the IGBT dependent on a reference signal and collector or emitter voltage of the IGBT such that during an off period of said IGBT said reference signal limits an absolute value of collector-emitter voltage of said IGBT to be within a range; and control to temporarily change during said limiting said reference signal from an initial value to a temporary clamp value to reduce said range, said change when each of said devices is in a substantially non-conducting state. | 09-13-2012 |
20120236616 | INVERTER CAPABLE OF PROVIDING REACTIVE POWER - In an inverter includes two input lines for connection to a DC voltage source, two half-bridges connecting the two input lines, and two output lines for connection to an alternating current load or an AC power grid. Each half-bridge includes two pulse-operated switches with reverse connected diodes, each output line is connected to a center point of one of the half-bridges via an inductance, and the two output lines are connected to the same one of the input lines via a further pulse-operated switch behind the inductance with respect to the associated half-bridge. | 09-20-2012 |
20120236617 | POWER CONVERTER - A motor control apparatus | 09-20-2012 |
20120243280 | INVERTER FOR CONVERTING A DIRECT CURRENT VOLTAGE INTO AN ALTERNATING CURRENT VOLTAGE AND METHOD THEREOF - An inverter includes a first half period circuit, a second half period circuit, a first inductor, and a second inductor. A DC voltage source is used for providing a DC voltage. A loop of the first half period circuit and the first inductor is used for converting the DC voltage into a first half period of an AC voltage of an AC voltage source, and modulating a shape of the first half period of the AC voltage according to a second clock. A loop of the second half period circuit and the second inductor is used for converting the DC voltage into a second half period of the AC voltage, and modulating a shape of the second half period of the AC voltage according to a third clock. | 09-27-2012 |
20120243281 | POWER SEMICONDUCTOR DEVICE - According to one embodiment, a power semiconductor device includes a first conductor, a second conductor, and a first semiconductor chip. The first conductor includes a first portion and a second portion. The first portion includes a first major surface and a second major surface opposite thereto. The second portion includes a third major surface intersecting at right angles with the first major surface and a fourth major surface opposite to the third major surface. The fourth major surface becomes farther from the third major surface to become continuous with the second major surface with proximity to the first major surface. The second conductor includes a third portion and a fourth portion. The third portion is similar to the first portion. The fourth portion is similar to the second portion. The first semiconductor chip is placed between the second portion and the forth portion. | 09-27-2012 |
20120243282 | CONVERTER FOR HIGH VOLTAGES - A submodule of a high-voltage inverter has a first sub-unit with a first energy storage device, a first series circuit of two power semiconductor switching units connected in parallel with the first energy storage device, each including a switchable power semiconductor, having the same pass-through direction, and each being conductive opposite the nominal pass-through direction. A first connection terminal is connected to the potential point between the power semiconductor switching units of the first series circuit. A second sub-unit has a second energy storage device, a second series circuit of two power semiconductor switching units connected in parallel with the second energy storage device, each including a switchable power semiconductor, having the same pass-through direction, and each being conductive opposite the nominal pass-through direction. A second connection terminal is connected to the potential point between the power semiconductor switching units of the second series circuit, limiting short circuit currents quickly, reliably, and effectively in case of a fault. The first and second sub-units are connected to each other by connections designed such that a current flow between the first connection terminal and the second connection terminal in both directions takes place only via the first energy storage device and/or the second energy storage device in a selected switching state of all power semiconductor switching units. | 09-27-2012 |
20120250384 | INVERTER DEVICE - An inverter device including a plurality of switching elements that convert electric power between DC power and AC power, a base plate that includes a surface on which the switching elements are placed, AC terminals through which AC power is input and output to and from an external device and which are electrically connected to the switching elements, and a capacitor that smoothes DC power. The AC terminals are disposed to protrude from the base plate perpendicular to the surface in a first reference direction. The capacitor is disposed in a rectangular area so that long sides of the rectangle are parallel to the first reference direction in plan view, and is set adjacent to a base disposition area, in which the base plate and the AC terminals are disposed in a second reference direction that is a direction perpendicular to the first reference direction. | 10-04-2012 |
20120250385 | TEMPERATURE DETECTING APPARATUS, TEMPERATURE DETECTING CIRCUIT AND POWER SEMICONDUCTOR MODULE - A temperature detecting apparatus includes a temperature detecting circuit configured to output a first pulse signal according to a temperature detected by a temperature sensor, and an insulating transformer configured to transmit the first pulse signal to an integrated circuit which is operated by an operation voltage different from that of the temperature detecting circuit. The insulating transformer is installed between the temperature detecting circuit and the integrated circuit. The temperature detecting circuit and the insulating transformer are mounted on a common substrate. | 10-04-2012 |
20120257431 | POWER SUPPLY APPARATUS - A power supply apparatus includes an inverter having output terminals; a first transformer that transforms alternating-current output from the output terminals; a second transformer that is connected to the output terminals in parallel to the first transformer, arranged on an opposite side of the first transformer with respect to a straight line passing through a center of the output terminals and extending perpendicularly to a plane including the output terminals, and transforms alternating-current power output from the output terminals; first conductive lines that connect the output terminals to both ends of the first transformer; and second conductive lines that connect the output terminals to both ends of the second transformer. An area of a first loop formed by the inverter, the first conductive lines, and the first transformer is equal to an area of a second loop formed by the inverter, the second conductive lines, and the second transformer. | 10-11-2012 |
20120300524 | METHOD AND APPARATUS FOR GENERATING SINGLE-PHASE POWER FROM A THREE-PHASE RESONANT POWER CONVERTER - A method and apparatus for providing AC power. In one embodiment, the apparatus comprises a cycloconverter controller for determining a DC value based on a reference waveform and a three-phase cycloconverter, coupled to the cycloconverter controller, for selectively coupling, based on the DC value, an alternating current to an AC line to generate a single-phase AC output. | 11-29-2012 |
20120307541 | POWER CONVERTER, SEMICONDUCTOR DEVICE, AND METHOD FOR MANUFACTURING POWER CONVERTER - This power converter includes a first substrate, a second substrate, a power conversion element, and a case portion, and the case portion includes a first connection terminal connected to a first conductor pattern arranged on a side of the first substrate closer to the power conversion element and a second connection terminal connected to a second conductor pattern arranged on a side of the second substrate opposite to the power conversion element. | 12-06-2012 |
20120320650 | METHOD FOR CONTROLLING A CONVERTER - A method controls a three-phase converter with a voltage intermediate circuit by pulse-width modulation for supplying a polyphase system, in particular a three-phase machine. The converter is operated with at least two different modulation methods which are selected from among the group of modulation methods which includes single-phase switching, two-phase switching and three-phase switching, and for chageovers to be made between the at least two different modulation methods depending on the operating state of the polyphase system. | 12-20-2012 |
20130010512 | DC-AC CONVERTER - Disclosed is a DC-AC converter including a switch circuit for converting the DC power to output an AC voltage between a first output terminal and a second output terminal. The switch circuit includes a first switch branch having a first switch element and a second switch element; a second switch branch having a third switch element, a fourth switch element, and a fifth switch element; and a sixth switch element having one end connected between the third switch element and the fourth switch element and the other end connected between the first switch element and the second switch element. The first switch element, the second switch element, the third switch element, the fourth switch element, the fifth switch element, and the sixth switch element are configured to turn on/off to enhance the conversion efficiency of the DC-AC converter and subdue the occurrence of leak current in the DC-AC converter. | 01-10-2013 |
20130016550 | INVERTERAANM Ku; Chen-WeiAACI Taoyuan HsienAACO TWAAGP Ku; Chen-Wei Taoyuan Hsien TWAANM Lee; Lei-MingAACI Taoyuan HsienAACO TWAAGP Lee; Lei-Ming Taoyuan Hsien TWAANM Huang; HoAACI Taoyuan HsienAACO TWAAGP Huang; Ho Taoyuan Hsien TW - An inverter including a switch circuit for converting a DC power to output an AC voltage between a first output terminal and a second output terminal is provided. The switch circuit includes a first switch branch having a first switch element, a second switch element, and a third switch element; a second switch branch having a fourth switch element, a fifth switch element, and a sixth switch element; a first freewheeling unit connected to the first switch element, the second switch element, and the second output terminal for providing a freewheeling path between the second output terminal and the first switch element and the second switch element; and a second freewheeling unit connected to the fourth switch element and the fifth switch element and the first output terminal for providing a freewheeling path between the first output terminal and the fourth switch element and the fifth switch element. | 01-17-2013 |
20130028000 | APPARATUS FOR CONVERTING ELECTRIC ENERGY AND METHOD FOR OPERATING SUCH AN APPARATUS - A device for converting direct voltage from an electrochemical store or a fuel cell to alternating voltage, includes a two-stage design having a single DC/DC converter stage for generating an intermediate circuit voltage from the output voltage of the electrochemical store or the fuel cell, which converter stage converts, in particular raises, the direct voltage in a wide input voltage range directly to an intermediate circuit voltage with which a DC/AC converter stage can be operated to generate the alternating voltage. The single DC/AC converter stage generates the alternating voltage from the intermediate circuit voltage. The invention further relates to a method for actuating a device for converting direct voltage from a store or energy generator into alternating voltage for feeding into a supply network. | 01-31-2013 |
20130033912 | FIVE-LEVEL DC-AC CONVERTER - A five-level DC-AC converter includes a capacitor set and a full-bridge circuit. The capacitor set contains two DC capacitors, a power electronic switch and two diodes. When the power electronic switch is turned on/off, the two DC capacitors are connected in series/parallel to provide a two-level DC voltage to the full-bridge circuit. The full-bridge circuit further converts the two-level DC voltage to output a voltage with three voltage levels in the positive half cycle and three voltage levels in the negative half cycle. This achieves the goal of using five power electronic switches to convert DC power into AC power with five voltage levels. | 02-07-2013 |
20130033913 | POWER CAPACITOR - A power capacitor, in particular a DC link capacitor, having a capacitor housing which has a first housing wall, in particular made of metal, which is galvanically connectable to a housing of an electronics unit, in particular a power electronics unit, and planar energizing units for energizing the power capacitor. A first subregion of a first energizing unit extends in an inner space of the housing adjacent to and at a distance from the first housing wall or from a different housing wall of the capacitor housing that is conductively connected to the first housing wall. A layer made of a dielectric material other than air is situated between the first subregion of the first energizing unit and this housing wall. | 02-07-2013 |
20130033914 | Power Conversion Device - A power conversion device ( | 02-07-2013 |
20130044528 | GATE DRIVE CIRCUIT AND POWER CONVERTER - This gate drive circuit includes a P-type field effect transistor, an N-type field effect transistor, and a diode, and the diode is so formed as to shift a voltage applied to at least either a gate of the P-type field effect transistor or a gate of the N-type field effect transistor to a side of a threshold voltage of the gate. | 02-21-2013 |
20130044529 | Power Supply Control System - A power supply control system for a power supply having a first half-bridge leg and a second half-bridge leg. In the control system, a first plurality of drive signals are configured to operate a half-bridge as a forward leg while a second plurality of drive signals are configured to operate a half-bridge as a backward leg. A switch element is intermediate the first and second plurality of drive signals and the first and the second half-bridge legs, the switch element being adapted to operate the first half-bridge as a forward leg and the second half-bridge as a backward leg in a first operating mode, the switch element being further adapted to operate the first half-bridge as a backward leg and the second half-bridge as a forward leg in a second operating mode. | 02-21-2013 |
20130070503 | SYNCHRONOUS NON-ISOLATED PUSH-PULL CONVERTER - A push-pull converter configured to convert an input voltage to an output voltage according to a transfer ratio is provided. The push-pull converter comprises a transformer, a first and a second switch transistor arranged to operatively provide the input voltage to the transformer such that the transfer ratio is obtainable, a first and a second rectification transistor arranged to operatively receive a first and a second part, respectively, of the output voltage from the transformer such that the transfer ratio is obtainable. The push-pull converter is further configured to synchronously operate the first switch transistor and the first rectification transistor, synchronously operate the second switch transistor and the second rectification transistor, and operate the first and second switch transistors 180 degrees out of phase with respect to each other. | 03-21-2013 |
20130070504 | NON-ISOLATED INVERTER AND RELATED CONTROL MANNER THEREOF AND APPLICATION USING THE SAME - A non-isolated inverter including a DC input-side, a capacitor connected in parallel with the DC input-side, an AC output-side connected in parallel with a load, and first and second bridge-arm units is provided. The first and second bridge-arm units are connected in parallel with the capacitor. The first bridge-arm unit includes a series forward-connection of upper and lower switch-elements, where a common-node of upper and lower switch-elements and a supplying terminal of the second bridge-arm unit are respectively connected to two terminals of the AC output-side. The upper and lower switch-elements are respectively turned on in positive and negative half cycles of an output current of the non-isolated inverter, and the generation of common-mode currents in the non-isolated inverter is suppressed under a clamping action between the upper and lower switch-elements due to there are no high-frequency voltages on the parasitic-capacitors from the non-isolated inverter to the ground. | 03-21-2013 |
20130094267 | EVEN-LEVEL INVERTER - There is provided an even-level inverter, including: a voltage-dividing circuit dividing input DC power into an even number of voltage levels; a plurality of switching devices connected to individual nodes of the voltage-dividing circuit having the even number of voltage levels; and a bidirectional switching device connected to the individual nodes of the voltage-dividing circuit through at least one of the plurality of switching devices and including at least two transistors. According to the present invention, the bidirectional switching device is implemented without a diode to thereby reduce conduction loss caused due to an anti-parallel diode included in the related art bidirectional switching device, and a neutral point of the voltage-dividing circuit is electrically separated from the switching devices to thereby control reactive power. | 04-18-2013 |
20130094268 | 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. | 04-18-2013 |
20130114321 | INVERTER TOPOLOGY CIRCUIT, INVERSION METHOD AND INVERTER - An inversion method and an inverter, in which a fifth switch tube, a sixth switch tube, a fifth diode, a sixth diode, and a first capacitor are added in the existing inverter circuit including a bridge arm, the fifth switch tube is connected in parallel to the fifth diode, and the sixth switch tube is connected in parallel to the sixth diode; wherein the positive pole of the fifth diode is connected to the negative pole of a direct current source, the negative pole of the fifth diode is connected to a connection circuit between a second inductor and an alternating current source, the positive pole of the sixth diode is connected to the negative pole of the direct current source, and the negative pole of the sixth diode is connected to a connection circuit between a first inductor and the alternating current source. | 05-09-2013 |
20130128644 | DUAL BRIDGE INVERTER USABLE WITH REACTIVE POWER - The invention relates to inverters employing a first and a second bridge circuit for converting DC input current into an AC output current. In particular, the invention proposes an inverter including two DC input terminals with a first and a second bridge circuit connected in parallel therebetween, the first bridge circuit for providing a first half-wave of a first polarity to a pair of AC output terminals and the second bridge circuit for providing a second half-wave of an opposite polarity to the pair of AC output terminals. The first half-wave is supplied from the first bridge circuit via a first and a second inductive element to the pair of AC output terminals, and the second half-wave is supplied from the second bridge circuit via a third and a fourth inductive element to the pair of AC output terminals. | 05-23-2013 |
20130148397 | MULTI-PHASE CONVERTER SYSTEM AND METHOD - A multi-phase converter includes a plurality of phase paths. Each phase path includes at least one dc-link that is independent from every other phase path dc-link such that each output phase voltage is generated from a corresponding dc-link voltage source that can be different from every other phase voltage dc-link voltage source. A total dc-link voltage level is determined for each output phase voltage. A common-mode injection voltage is calculated based on all dc-link voltage levels and all phase reference voltages. Each phase path reference voltage is then adjusted based on the calculated common-mode injection voltage, such that each generated output phase voltage level is adjusted in response to its corresponding adjusted reference voltage. | 06-13-2013 |
20130155747 | HIGH-EFFICIENCY, THREE-LEVEL, SINGLE-PHASE INVERTER - A highly efficient transformerless inverter and a method of controlling the same. The inverter is designed for use in a distributed power generation system, such as a home having photovoltaic cells (e.g., a solar panel), wind turbines, batteries, and other sources of DC electrical power. The inverter includes four switching states including a positive current path for a positive half-cycle, a free-wheel current path for the positive half-cycle, a negative current path for a negative half-cycle, and a second free-wheel current path for the negative half-cycle. The free-wheel current paths include a reduced number of circuit components (e.g., diodes), which enables a highly efficient inversion of DC power to AC power. | 06-20-2013 |
20130176762 | Three Level Inverter Modulation - An apparatus, system, and method for providing three level inverter modulation. In one embodiment, control signals can be provided to control a three level inverter in a power converter based on at least one feedback signal. | 07-11-2013 |
20130235637 | 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. | 09-12-2013 |
20130242631 | POWER CONVERTER APPARATUS - A power converter apparatus includes a first substrate and a second substrate closely arranged to face each other, switching elements mounted on respective mounting surfaces of the first and second substrates, a primary and a secondary bus bars extending between the first and second substrates, an output terminal electrically connected to the primary bus bar, and two input terminals provided on the second substrate. The direction in which current flows into the first substrate and the direction in which current flows into the second substrate via the input and the output terminals are opposite to each other, and the direction in which the current flows into the primary bus bar and a direction in which the current flows into the secondary bus bar are opposite to each other. | 09-19-2013 |
20130258737 | Inverter - An inverter for the selective feeding of effective power and reactive power into a power grid has two serially connected intermediate circuit capacitors, the joint connection of which defines a median voltage level between a positive voltage level and a negative voltage level. It also has first, second, third, and fourth semiconductor switches having free-wheeling diodes respectively connected in parallel, which are arranged serially in this sequence between the positive and the negative voltage levels, the joint connection of the second and third semiconductor switches being connected to the power grid via a choke. The inverter also has serially connected first and second diodes, the joint connection of which is at the median voltage level, and whose second connection is connected to the joint connection of the first and second semiconductor switches and of the third and fourth semiconductor switches. Joint connections of two of the first to fourth semiconductor switches are connected to additional chokes, which by additional semiconductor switches form switchable paths for accepting free-wheeling currents. In this manner, it is possible to avoid putting stress on diodes as a result of the reverse recovery effect. | 10-03-2013 |
20130272046 | POWER CONVERSION DEVICE - The power conversion device includes a plurality of semiconductor modules, each having a main body section including a switching element therein. In a module unit, a positive module and a negative module are disposed such that main surfaces of the respective main body sections oppose each other. A positive terminal, a first intermediate terminal, a negative terminal, and a second intermediate terminal project in a Z direction perpendicular to X direction in which the positive module and the negative module oppose each other. A first vector V | 10-17-2013 |
20130279228 | SYSTEM AND METHOD FOR IMPROVING LOW-LOAD EFFICIENCY OF HIGH POWER CONVERTERS - Systems and methods for improving low-load efficiency of power converters are provided. The power converter can include one or more bridge circuits having multiple switching modules, such as insulated gate bipolar transistor (IGBT) modules, connected in parallel within the same bridge circuit. The power converter is configured to convert power from an input power source, such as a photovoltaic array or a wind turbine, into output power at a grid frequency. To avoid excessive switching losses at low load conditions, the power converter can be controlled to selectively operate a subset of the switching modules within the same bridge circuit based on a load condition for the power converter. The remaining switching modules in the bridge circuit can be disabled. | 10-24-2013 |
20130279229 | POWER INVERTER CIRCUIT - A power inverter circuit | 10-24-2013 |
20130286704 | CASCADED H-BRIDGE (CHB) INVERTER LEVEL SHIFT PWM WITH ROTATION - Cascade H-Bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control THD and to mitigate power distribution imbalances within multilevel inverter elements. | 10-31-2013 |
20130301326 | METHOD AND APPARATUS FOR CONTROLLING THERMAL CYCLING - A method for reducing thermal cycling of a semiconductor power switch includes obtaining a value indicative of a junction temperature of the power switch. The method also includes selecting one of several pre-determined gate drive voltages, based on the obtained value, and providing the selected gate drive voltage to a gate of the power switch. This reduces thermal cycling of a power switch relative to the thermal cycling that would be present during operation at a single gate temperature. | 11-14-2013 |
20130301327 | SYSTEM AND METHOD OF PARALLEL CONVERTER CURRENT SHARING - In one aspect, a method of converting power is described. One embodiment of the method comprises receiving direct current (DC) power; channeling the DC power through an inverter including a first bridge and a second bridge, wherein each of the first bridge and the second bridge includes at least one switch; controlling the at least one switch of the first bridge and the at least one switch of the second bridge to convert the DC power to alternating current (AC) power; and, channeling the AC power through an inductor that includes a first winding and a second winding, wherein the first winding is coupled to an output of the first bridge and the second winding is coupled to an output of the second bridge and wherein the inductor is configured to have a first magnetic path for common mode inductance and a second magnetic path for differential mode inductance. | 11-14-2013 |
20130314965 | INVERTER DEVICE - An inverter device includes a DC positive input line and a DC negative input line, a main bridge which includes a pair of series-connected switching elements with diodes being connected in reverse parallel with the switching elements respectively, an auxiliary bridge which includes a pair of series-connected switching elements with diodes being connected in reverse parallel with the switching elements respectively and a current-limiting reactor. A plurality of sets each one of which includes the main bridge and the auxiliary bridge is connected between the DC positive and negative input lines. Each set constitutes a phase. The current-limiting reactor is connected between a common connection point of both switching elements of the main bridge and a common connection point of both switching elements of the auxiliary bridge in each set. | 11-28-2013 |
20130329477 | METHOD OF SHOOT-THROUGH GENERATION FOR MODIFIED SINE WAVE Z-SOURCE, QUASI-Z-SOURCE AND TRANS-Z-SOURCE INVERTERS - This invention belongs into the field of power electronics and semiconductor converter control and pertains to the method of shoot-through generation for modified sine wave Z-source, quasi-Z-source and trans-Z-source inverters. The inverter can be controlled using either the modified sine wave pulse-width modulation or phase-shift modulation method. There are three methods for shoot-through generation in the case of modified sine wave control: by overlapping active states, during the freewheeling state and during the zero state. | 12-12-2013 |
20140016387 | Power Inverter - In a power inverter, a coolant passage is fixed to a chassis to cool the chassis; the chassis is divided into a first region and a second region by providing the coolant passage in the chassis; a power module is provided in the first region as fixed to the coolant passage; a capacitor module is provided in the second region; and the DC terminal of the capacitor module is directly connected to the DC terminal of the power module. | 01-16-2014 |
20140029323 | POWER CONVERTER IN WHICH SWITCHING ELEMENTS ARE DRIVEN IN PARALLEL - A power converter for converting DC power to AC power by switching operation of a switching element includes: a bridge circuit configured by at least two series circuits using, as power input terminals, terminals on both sides of two switching elements connected to each other in series and using, as a power output terminal, a connection point of the two switching elements are connected in parallel via the power output terminal; a gate drive circuit for outputting a driving signal which controls to turn on/off the switching elements; and signal lines using a driving signal output terminal in the gate drive circuit as a starting point of wiring, individually hard-wired to each of the switching elements in each of series circuits to which the same driving signal is supplied from the driving signal output terminal, and having inductances which are configured equal to each other. | 01-30-2014 |
20140063884 | INVERTER DEVICE - In an inverter device, a first three-level circuit includes first to fourth preceding-stage switch elements connected in series between a first input end and a ground and a first charging and discharging capacitor. A second three-level circuit includes fifth to eighth preceding-stage switch elements connected in series between a second input end and the ground and a second charging and discharging capacitor. The first and second two three-level circuits define a five-level circuit that is subjected to switching with the carrier frequency of PWM modulation. The output polarity of a subsequent-stage bridge clamping circuit is inverted between the anterior half cycle and the posterior half cycle of a power supply frequency. | 03-06-2014 |
20140063885 | POWER-SYSTEM-INTERCONNECTED INVERTER DEVICE - In a power-system-interconnected inverter device, PI control circuits obtain voltage correction values in directions reducing the current errors on the basis of current errors serving as differences between target current values and detection values. Multiplexers provide modulation circuits with voltage target values corrected by the voltage correction values being added to voltage detection values. The modulation circuits provide gate signals for switch elements in multilevel circuits. In addition, a sign circuit provides gate signals for switch elements in a bridge clamping circuit. | 03-06-2014 |
20140078802 | DC/AC INVERTER TO CONVERT DC CURRENT/VOLTAGE TO AC CURRENT/VOLTAGE - A DC/AC inverter is disclosed having two DC input terminals ( | 03-20-2014 |
20140085954 | SEMICONDUCTOR POWER CONVERSION DEVICE - A semiconductor power conversion device includes n (where n is a natural number) mutually isolated inverse conversion devices that output three-level voltage; and an inverse conversion device, isolated from the inverse conversion devices, that employs as input DC voltage a voltage V | 03-27-2014 |
20140085955 | Power Conversion Apparatus - The power conversion apparatus includes an inverter circuit which converts a DC current into an AC current and have a U-phase, V-phase, and w-phase power semiconductor modules, and a capacitor module for smoothing the DC current. Each of the power semiconductor modules is configured separately and connected to a first bus bar. The first bus bar is configured with a first positive side bus bar, a first negative side bus bar, and a first insulation member arranged between the first positive side bus bar and the first negative side bus bar. The first bus bar includes a first to third terminals to which the U-phase, V-phase, and W-phase power semiconductor modules are connected, respectively, and a fourth terminal connected to a terminal of the second bus bar protruding from a surface of sealing material of a second bus bar. | 03-27-2014 |
20140092662 | DC TO AC CONVERSION CIRCUIT - A DC to AC conversion circuit including an inverter, a first inductor, a first capacitor, a second inductor and a second capacitor is provided. The inverter has two input contact points and two output contact points. The input contact points receive a DC signal, and the output contact points output an AC signal. The first terminal of the first inductor is coupled to one of the two output contact points. The first capacitor is coupled to the first inductor in parallel. The first terminal of the second capacitor is coupled to the second terminal of the first inductor, and the second terminal of the second capacitor is coupled to another one of two output contact points. The first terminal of the second inductor is coupled to the first terminal of the second capacitor, and the second terminal of the second inductor is coupled to a load. | 04-03-2014 |
20140119085 | SLAVE CIRCUIT FOR DISTRIBUTED POWER CONVERTERS IN A SOLAR MODULE - An inverter device for a solar module. The inverter device comprises a slave circuit device that includes an input comprising a DC input from a solar cell group and a preliminary boost circuit. A DC boost circuit is coupled to the preliminary boost circuit and configured to boost the intermediary voltage to an AC RMS peak voltage. A rectifier circuit is coupled to the DC boost circuit. An energy recovery circuit comprises a storage device coupled to the rectifier output. The energy recovery circuit is configured to temporarily store a reverse recovery charge and transfers the reverse recovery charge to an output of a DC bus structure to reduce a diode recovery loss in the rectifier circuit. | 05-01-2014 |
20140119086 | ENERGY RECOVERY CIRCUIT FOR DISTRIBUTED POWER CONVERTERS IN SOLAR CELLS - A method of operating an inverter device configured on a back plane of a solar module, the inverter device comprising an energy recovery circuit device coupled to a rectifier circuit, the method comprising transferring a charge from a rectifier output to a storage capacitor configured in an energy recovery circuit; storing the charge at the storage capacitor for a time period associated with a reverse recovery time; and transferring the charge to an output of a DC bus structure to reduce a diode recovery loss in the rectifier circuit. | 05-01-2014 |
20140119087 | POWER CONVERTER - A power converter including a plurality of semiconductor modules each having a body including semiconductor elements, where the body is provided with control terminals, a pair of input terminals, and at least two output terminals protruding from the body. The output terminals protruding from the bodies of the respective semiconductor modules are grouped into a plurality of output terminal groups each formed of three output terminals belonging to at least two different semiconductor modules. The power converter further includes a control circuit board electrically connected to the control terminals and configured to turn on and off the respective semiconductor elements of the respective semiconductor modules so as to convert a DC voltage applied to the pair of input terminals of each semiconductor module into a three-phase AC voltage to be outputted from each output terminal group. | 05-01-2014 |
20140133205 | SINE PULSE WIDTH MODULATION CONTROLLER - A sine pulse width modulation controller includes an edge detection unit for receiving a feedback input signal from the external electrical device to generate an edge signal, a register unit for storing and outputting a parameter signal, an angle increasing unit for receiving the edge signal and the parameter signal, determining cycles of pulse width modulation and generating an angle signal, a sine calculation unit for receiving the angle signal and performing a recursive algorithm based on the angle signal to implement the recursive algorithm so as to generate a sine calculation value, a multiplication unit for receiving the sine calculation value which is then further multiplied by the amplitude signal from the register unit to generate a pulse width signal, and a sine output unit receiving the pulse width signal to generate driving signals for driving the external electrical device to generate a sine terminal voltage. | 05-15-2014 |
20140133206 | FULL-BRIDGE POWER CONVERTER - A full-bridge power converter is provided wherein a full-bridge circuit is operated so as to minimize ripple current. A switch control unit | 05-15-2014 |
20140160821 | POWER CONVERSION APPARATUS - Technology leading to a size reduction in a power conversion apparatus comprising a cooling function and technology relating to enhancing productivity and enhancing reliability necessary for commercial production are provided. Series circuits comprising an upper arm and lower arm of an inverter circuit are built in a single semiconductor module | 06-12-2014 |
20140169053 | DISTRIBUTED VOLTAGE SOURCE INVERTERS - Systems and methods are disclosed with multiple direct current (DC) voltage source inverters to supply power to an alternating current (AC) power system. The system includes a plurality of full bridge inverter stages, each having a primary node and a secondary node, each of said full bridge inverter stages having positive and negative node, each of said full bridge inverter stages having a voltage supporting device electrically connected in a parallel relationship between said positive node and said negative node and a direct current (DC) source connected between the positive and negative nodes; at least one stacked inverter phase, each stacked inverter phase having a plurality of said full bridge inverter stages, each of said full bridge inverter stages in each stacked inverter phase interconnected in a series relationship with said secondary node of one of said full bridge inverter stages connected to said primary node of another full bridge inverter, said series interconnection defining a first full bridge inverter stage and a last full bridge inverter stage, each phase having an input node at said primary node of said first full bridge inverter stage and an output node at said secondary node of said last full bridge inverter stage; a local controller coupled to each full bridge inverter stage providing the control signals to each full bridge inverter stage to output an approximate nearly sinusoidal voltage waveform; and a system controller which communicating with each local controller; the system controller generating system control signals for configuration, synchronization, activation, deactivation and operating mode selection of said local controller. | 06-19-2014 |
20140169054 | SEMICONDUCTOR MODULE, UPPER AND LOWER ARM KIT, AND THREE-LEVEL INVERTER - A semiconductor module, an upper and lower arm kit, and a three-level inverter can be provided with low cost and broad current ratings and voltage ratings using existing packages, without developing new packages. | 06-19-2014 |
20140169055 | NON-ISOLATED DC/AC INVERTER - A method and apparatus for converting DC power comprising: a boost circuit comprising two switches and a capacitor where the two switches are serially connected and coupled in parallel to the capacitor, a voltage source inverter (VSI) comprising at least four switches in an H-bridge configuration, and a controller coupled to the boost circuit and VSI for selectively energizing the switches wherein no more than two switches are toggling in a time period for operating the apparatus in either the buck mode or boost mode. | 06-19-2014 |
20140204643 | CONTROL SCHEME FOR CURRENT BALANCING BETWEEN PARALLEL BRIDGE CIRCUITS - A control scheme for reducing current imbalance between parallel bridge circuits in a power converter system is provided. The power converter can include a plurality of bridge circuits coupled in parallel to increase the output power capability of the power system. The parallel bridge circuits can be controlled pursuant to a control scheme for reducing current imbalance between the parallel bridge circuits. In particular, a pulse test can be performed in which a pulse is applied to each of the plurality of bridge circuits. The switch timing of the switching elements responsive to the pulse can be measured and analyzed to determine a timing difference adjustment for one or more of the switching elements of the plurality of bridge circuits. The timing difference adjustment can be stored and used to adjust all subsequent switching events in the parallel bridge circuits. | 07-24-2014 |
20140211530 | PHOTOVOLTAIC SYSTEM AND METHOD OF CONTROLLING SAME - A photovoltaic (PV) system is disclosed that provides dynamic regulation of the output of a PV array such that the inverter can safely operate without entering a voltage protection mode. The PV system includes a PV array that generates a direct current (DC) output from received solar radiation and a DC link coupled to the PV array to receive the DC output therefrom. The PV system also includes a DC-to-AC power inverter electrically coupled to the DC link to receive the DC output therefrom and invert the DC output to an AC output and a damping circuit electrically coupled to the DC link and positioned between the PV array and the DC-to-AC power inverter. The damping circuit includes a damping resistor and a damping switch. | 07-31-2014 |
20140247634 | THREE-LEVEL POWER CONVERSION CIRCUIT SYSTEM - A three-level power conversion circuit includes a plurality of one-phase switch circuits which receive power from direct current power supplies that are connected in series. Each of the one-phase switch circuits includes a semiconductor switch series circuit that is connected in parallel to the direct current power supplies, and also a bidirectional switch and a circuit-opening device that are connected in series between a series connection point of the semiconductor switch series circuit and a series connection point of the direct current power supplies. If a semiconductor element in a bidirectional switch fails, the circuit opening device opens a path along which the main current of the semiconductor element flows, and operation of the inverter is continued as a two-level inverter with the remaining bidirectional switches in a constant off-state. | 09-04-2014 |
20140254228 | THREE-LEVEL CONVERTER - A three-level converter includes at least one phase bridge arm, each including an upper-half and a lower-half bridge arm circuit modules. The upper-half bridge arm circuit module includes a first and a second switch units that are in series connection, and a first diode unit. The lower-half bridge arm circuit module includes a third and a fourth switch units that are in series connection, and a second diode unit. The first and second diode units are connected to the neutral point of the capacitor unit; the second and third switch units are connected to the alternating-current terminal; The first and the fourth switch unit is respectively connected to the positive terminal and negative terminal of the direct-current bus; the capacitor unit is connected to the direct-current bus between the positive and negative terminals. The two modules are disposed side by side and facing each other. | 09-11-2014 |
20140254229 | MODULAR HIGH-FREQUENCY CONVERTER AND METHOD FOR OPERATING THE SAME - A modular high-frequency converter includes submodules, each having an input-side half bridge and a DC link circuit with a DC link capacitance connected in parallel to the half bridge. A DC link circuit voltage drop across the DC link capacitance of each submodule is controlled to a target voltage by adjusting a duty cycle with a closed-loop control structure having a pilot control and a downstream closed-loop error control. Within the framework of the pilot control, a target value for each duty cycle and a target value for the supply current are determined, using a mathematical model of the converter, based on the load-side output currents flowing out of the DC link voltage circuits and on target values of the DC link circuit voltages. Switch position parameters, which map the effect of the switch positions of the input-side half bridges, are each replaced by an associated duty cycle. | 09-11-2014 |
20140301123 | DC-TO-AC POWER CONVERSION SYSTEM AND METHOD OF OPERATING THE SAME - A DC-to-AC power conversion system is provided to convert a DC input voltage into an AC output voltage, which mainly includes a bridge switching circuit, an auxiliary switch circuit, and a control circuit. The bridge switching circuit has a first power switch, a second power switch, a third power switch, and a fourth power switch. The auxiliary switch circuit has a fifth power switch, a sixth power switch, a seventh power switch, and an eighth power switch. The control circuit produces a complementary switching signal pair to control the first and fourth power switches and the second and third power switches, respectively. In addition, the control circuit produces a complementary level signal pair to control the sixth and seventh power switches and the fifth and eighth power switches, respectively. | 10-09-2014 |
20140301124 | Cascade Bridge-type DC-AC Power Conversion Method and Converter Device Thereof - A cascade bridge-type DC-AC power converter device includes a low-frequency bridge-type power converter including an AC terminal and a DC bus and a high-frequency bridge-type power converter including an AC terminal. A power conversion method includes: serially connecting the AC terminal of the high-frequency bridge-type power converter and the AC terminal of the low-frequency bridge-type power converter; operating frequency of the low-frequency bridge-type power converter synchronized with frequency of an AC source and operating the high-frequency bridge-type power converter with high-frequency PWM to generate a multilevel AC voltage. A DC power source connects to the DC bus of the low-frequency bridge-type power converter. No additional power supply circuit will be required for power supply to a DC bus of the high-frequency bridge-type power converter. Accordingly, the power circuit is simplified and the manufacturing cost is reduced. | 10-09-2014 |
20140313803 | TRANSFORMERLESS DC/AC CONVERTER - A method for generating an AC power signal using a transformerless DC/AC converter includes energizing a first inductor circuitry from a DC input source by controlling first, second and third switches to couple the first inductor circuitry to the DC input source; de-energizing the first inductor circuitry by controlling the first, second and third switches to decouple the first inductor circuitry from the DC input source and couple the first inductor circuitry to an output node to generate, at least in part, a first half cycle of an AC power signal at the output node; energizing a second inductor circuitry from a DC input source by controlling fourth, fifth and sixth switches to couple the second inductor circuitry to the DC input source; and de-energizing the second inductor circuitry by controlling the fourth, fifth and sixth switches to decouple the second inductor circuitry from the DC input source and couple the second inductor circuitry to the output node to generate, at least in part, a second half cycle of the AC power signal at the output node. | 10-23-2014 |
20140313804 | NEUTRAL-POINT-CLAMPED MULTILEVEL POWER CONVERSION DEVICE - The present invention provides a power conversion device in which an on-pulse bias voltage and a neutral-point bias voltage do not interfere with each other. A power conversion device | 10-23-2014 |
20140321179 | Electrical Circuit Synchronisation - A method, apparatus, computer readable medium, and system for synchronising a power source with a three-phase electricity grid for the power source to supply electricity to the electricity grid is disclosed. The method comprises operating a first switching unit to disconnect a power source from an interfacing circuit. The interfacing circuit comprises a DC-to-AC converter arranged between the power source and a three-phase electricity grid for converting a DC voltage received from the power source to a three-phase AC voltage for supplying the electricity grid, an electrical storage unit connected across the DC-to-AC converter, and a resistance which is selectably connectable in parallel with the electrical storage unit across the DC-to-AC converter, operating a second switching unit to connect the electricity grid to the interfacing circuit, wherein the electrical storage unit is electrically coupled to the electricity grid through the DC-to-AC converter. The method further comprises connecting the resistance to and disconnecting the resistance from the electricity grid through the DC-to-AC converter when the second switching unit is connecting the electricity grid to the interfacing circuit. In addition, the method comprises monitoring one or more electrical characteristics of the interfacing circuit in accordance with the connection and disconnection of the resistance. Furthermore, the method comprises determining one or more electrical characteristics of the three-phase electricity grid in accordance with the monitored electrical characteristics of the interfacing circuit. | 10-30-2014 |
20140321180 | Inverter Circuit, Power Converter Circuit, And Electric Vehicle - An object is to reduce, with the control circuit of the full-bridge inverter circuit, distortions in an output signal of the inverter circuit resulting from an error in control of the switching of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit. The pulse width of a signal that controls ON/OFF of the high-side transistors and low-side transistors included in the first half-bridge circuit and the second half-bridge circuit is reduced, i.e., the duty cycle of the signal is reduced. This results in a reduction in short-circuit periods during which both the high-side transistor and the low-side transistor are on, thereby reducing distortions in a signal. | 10-30-2014 |
20140321181 | POWER CONVERSION DEVICE - An increase in leakage current when a reverse voltage is applied to reverse-blocking insulated gate bipolar transistors is suppressed, thus reducing a loss resulting from the leakage current. A power conversion device includes a bidirectional switch formed by connecting two reverse-blocking insulated gate bipolar transistors having reverse breakdown voltage characteristics in reverse parallel. A control circuit is configured so as to output command signals for bringing the gates of the reverse-blocking insulated gate bipolar transistors, to which a reverse voltage is applied, into an on state. | 10-30-2014 |
20140321182 | CONTROL APPARATUS AND CONTROL METHOD FOR VOLTAGE CONVERSION APPARATUS - A control apparatus for a voltage conversion apparatus includes: duty command signal generation means for generating a duty command signal corresponding to a duty ratio of switching elements carrier signal generation means for generating carrier signals corresponding to respective switching frequencies of the switching elements; switching control signal generation means for generating respective switching control signals of switching ON and OFF states of the switching elements, by comparing the duty command signal with the carrier signals; one arm driving control means for implementing one arm driving by alternatively turning on the first and second switching elements; and phase inverting means for bringing phases of portions, of the carrier signals, corresponding to switching at least right after arm switching, into a state where the phases are shifted from each other by 180 degrees between the first and second switching elements, at the time of the arm switching. | 10-30-2014 |
20140328102 | POWER SOURCE INVERTER FOR USE WITH A PHOTOVOLTAIC SOLAR PANEL - An improved topology is presented for a single phase power source inverter that is designed to minimize double frequency ripple. The inverter circuit includes: a capacitor coupled in parallel across a direct current (DC) voltage source; a bridge circuit having three legs electrically connected in parallel with the voltage source and each other, such that each leg of the bridge circuit being comprised of two switches coupled in series with each other; a low pass filter electrically connected between the bridge circuit and a load; an auxiliary inductor having a first terminal electrically connected to one leg of the bridge circuit and a second terminal electrically connected to another leg of the bridge circuit and the load; and a controller that drives the switches of the bridge circuit in a manner that maintains instantaneous power transfer across the bridge circuit constant. | 11-06-2014 |
20140334213 | SWITCHING ARRANGEMENT FOR INVERTER, AND INVERTER - Exemplary embodiments are directed to a method and switching arrangement for an inverter. The inverter including a positive direct current pole, a negative direct current pole, and a neutral direct current pole. The arrangement having a first controllable switch connected between the neutral direct current pole of the inverter and a virtual neutral point of an alternating current network supplied by the inverter; and/or a second controllable switch connected between the neutral direct current pole of the inverter and an earth potential of an alternating current network supplied by the inverter. | 11-13-2014 |
20140334214 | Inverter Device - In a switching circuit in which a power semiconductor switching element and a unipolar type diode are connected in parallel, the noise due to ringing is reduced. When the main circuit current flowing is equal to or less than a predetermined value, an Si-IGBT is switched and driven by a gate resistance. In this case, when the main circuit current detected is equal to or more than a threshold value, a main circuit current detection circuit changes a gate resistance switching pMOS from ON state to OFF state. Accordingly, the Si-IGBT operates with a summation of a gate resistance and a gate resistor. More specifically, a gate resistance value of a gate drive circuit of the Si-IGBT increases. Therefore, dv/dt of the collector-emitter voltage of the Si-IGBT, i.e., the recovery dv/dt of the unipolar type diode, is small, and therefore, the noise due to ringing can be reduced. | 11-13-2014 |
20140334215 | Resonant Bi-directional DC-AC Converter - A new and useful circuitry for DC to AC single stage conversion are presented, with the advantages of bi-directionality, resonant power transfer, high efficiency and simplicity. The output voltage dual polarity is achieved by means of control, synchronizing the output switch with one or the other of the primary switches. The invention also provides the means of canceling the common noise of the magnetic transformer. | 11-13-2014 |
20140355323 | Methods and Systems for Converting a DC-Voltage to an AC-Voltage - A device includes a full-bridge configured to convert a direct current (DC) voltage to an alternating current (AC) voltage. The full-bridge includes at least first, second, third and fourth bridge sections. Each of the first, second, third and fourth bridge sections includes a switch of a first type configured to switch in response to a first voltage level and a switch of a second type configured to switch in response to a second voltage level different than the first voltage level. The switch of the second type is configured to be driven using an inductive current of a load coupled to an output of the full-bridge. | 12-04-2014 |
20140355324 | INVERTER UNIT - An inverter unit includes a first circuit board and a second circuit board arranged at a predetermined space so as to face each other. Each of the first circuit board and the second circuit board has a main circuit forming area. A plurality of power devices are mounted in the main circuit forming area of the first circuit board and form a main circuit. A plurality of capacitors are electrically connected to the plurality of the power devices and mounted in the main circuit forming area of the second circuit board. A control circuit controls the operation of the main circuit. The second circuit board includes a control circuit forming area separated from the main circuit forming area. The control circuit includes a first control circuit formed in the control circuit forming area of the second circuit board. | 12-04-2014 |
20140362627 | CURRENT EQUALIZING BUSBAR - The present application discloses a current equalizing busbar for a converter comprising: a direct current busbar connected to a DC terminal of the converter and positive terminals and negative terminals of respective power modules; and an alternate current busbar connected to AC terminals of the respective power modules and a load; wherein, when the converter operates, a sum of an inductance caused by the DC busbar between the DC terminal and a positive terminal or a negative terminal of a power module and an inductance caused by the AC busbar between the load and an AC terminal of the power module is equal to a sum of an inductance caused by the DC busbar between the DC terminal and positive terminals or negative terminals of other power modules and an inductance caused by the AC busbar between the load and AC terminals of said other power modules. | 12-11-2014 |
20140362628 | MODULAR MULTIPLE CONVERTER COMPRISING REVERSE CONDUCTIVE POWER SEMICONDUCTOR SWITCHES - A submodule for a modular multilevel converter has at least one unipolar energy storage device, first and second connection terminals and a power semiconductor circuit with power semiconductor switches that are driven with a control signal and freewheeling diodes connected in parallel with an assigned power semiconductor switch in the opposite sense. Depending on the driving of the power semiconductor switches, the voltage across the energy storage device(s) or else a zero voltage can be generated between the first and second connection terminals. The power semiconductor circuit forms a bridging branch between the potential points of the first and second connection terminals. Only the power semiconductor switches in the bridging branch are reverse conductive power semiconductor switches. The submodule has low on-state losses during normal operation and is also cost-effective. | 12-11-2014 |
20150016168 | HIGHLY STABLE MAXIMUM POWER POINT TRACKING FOR BIPOLAR PHOTOVOLTAIC INVERTERS - The invention is a method of tracking the overall maximum power point of a grounded bipolar photovoltaic array by tracking and regulating the voltage of the weaker of the two monopolar subarrays at any instant in time. The transfer between subarrays being tracked for the maximum power point is seamless when the voltage of one subarray becomes lower than the other. This tracking method insures stable operation and maximum power transfer under all balanced and unbalanced PV array conditions. This tracking algorithm would typically be part of a larger digital power converter control system. | 01-15-2015 |
20150016169 | MULTILEVEL INVERTERS AND THEIR COMPONENTS - A multilevel inverter includes a first half bridge in series with a second half bridge, each comprising a switch having a channel. The switch is configured to block a substantial voltage in a first direction during a first mode of operation, to conduct substantial current through the channel in the first direction during a second mode of operation, and to conduct substantial current through the channel in a second direction during a third mode of operation. During the third mode of operation, a gate of the switch is biased relative to a source of the switch at a voltage that is less than a threshold voltage of the switch. The inverter may also include a third half bridge. The inverter can be configured such that in operation, switches of the third half bridge are switched at a substantially lower frequency than the switches of the first and second half bridges. | 01-15-2015 |
20150016170 | METHOD FOR CONTROLLING A MULTIPHASE CONVERTER - A method for controlling a polyphase inverter that includes a number of half bridges connected into an intermediate voltage circuit and center taps between switching elements. By cyclically switching the switching elements, the respective center taps of the half bridges are connected to an upper intermediate circuit rail or to a lower intermediate circuit rail of the intermediate voltage circuit according to the principle of pulse width modulation. The switching elements of at least one half bridge are driven in a modified manner, at least in some time intervals, in that the switching pulses of at least two consecutive periods of the pulse width modulation are concatenated directly in time as one switching pulse. In this way, the switching frequencies of the correspondingly driven switching elements and thus the switching losses of the latter can be further reduced. | 01-15-2015 |
20150023083 | POWER CONVERTER - In a filter capacitor including three capacitor elements including a first capacitor element at an end on one side in an electrical connection form and a second capacitor element at an end on the other side, a pair of direct-current terminals including a positive-electrode-side main terminal and a negative-electrode-side main terminal, which receive a direct-current voltage from a direct-current power supply, are provided, a first conductor path length between a positive-electrode-side terminal of the first capacitor element and the positive-electrode-side main terminal and a second conductor path length between a positive-electrode-side terminal of the second capacitor element and the positive-electrode-side main terminal are approximately the same, and a third conductor path length between a negative-electrode-side terminal of the first capacitor element and the negative-electrode-side main terminal and a fourth conductor path length between the negative-electrode-side terminal of the second capacitor element and the negative-electrode-side main terminal are approximately the same. | 01-22-2015 |
20150023084 | SEMICONDUCTOR MODULE - A semiconductor module includes a plurality of power semiconductor elements forming upper arms and lower arms of a plurality of sets of half bridge circuits; a plurality of control circuits on/off driving each power semiconductor element having a control terminal of the plurality of power semiconductor elements; and a power supply terminal and a plurality of control terminals, connected to a plurality of respective external connection control terminals. Low potential side electrodes of the power semiconductor elements forming the respective upper arms of the plurality of sets of half bridge circuits and high potential side electrodes of the power semiconductor elements forming the respective lower arms of the plurality of sets of half bridge circuits are individually connected to a plurality of respective external connection output terminals. | 01-22-2015 |
20150029772 | POWER SUPPLY DEVICE AND METHOD OF OPERATING DEVICE - A power supply device of the invention includes a first switching leg including first and second switching elements between DC terminals; a second switching leg including third and fourth switching elements between the DC terminals; a first capacitor leg including first and second capacitors between the DC terminals; a second capacitor leg including third and fourth capacitors between AC terminals; a first inductor between a connection of the first and second switching elements and one of the AC terminals; a second inductor between a connection of the third and fourth switching elements and another of the AC terminals; a controller; an AC power supply connected to the AC terminals and the connection of the third and fourth capacitors; and a DC power supply between the DC terminals, wherein the controller charges the first and second capacitors to a voltage higher than a voltage crest of the AC power supply. | 01-29-2015 |
20150036403 | System and Method for a Power Converter - In accordance with a preferred embodiment of the present invention, an inverter circuit includes a direct current (DC)-to-DC power converter configured to receive an input energy from a device via a first input terminal and a second input terminal, where the DC-to-DC power converter is configured to convert a first portion of the input energy to a DC energy. The inverter circuit also includes an inverter stage coupled to an output of the DC-to-DC power converter, and is connected to the first input terminal of the DC-to-DC power converter and the second input terminal of the DC-to-DC power converter, where the inverter stage is configured to convert a second portion of the input energy to a first output energy. | 02-05-2015 |
20150036404 | CONVERTER CONTROLLER WITH HALF BRIDGE ADAPTIVE DEAD TIME CIRCUIT AND METHOD - The present disclosure relates to a controller, a circuit and method for controlling a power converter using pulse width modulation (PWM). At least one logic block ( | 02-05-2015 |
20150049532 | METHOD FOR OPERATING A MULTI-PHASE MODULAR MULTI-LEVEL POWER CONVERTER - A method for operating a multi-phase modular power inverter having DC input terminals and AC phase voltage output terminals connected to a load, phase modules connected between the DC input terminals, with each phase module composed of valve arms connected in series at a connection point forming an AC phase voltage output terminal which is connected to a load, each valve arm having a plurality of power inverter cells with turn-off semiconductor switches and a choke connected in series, includes controlling, with a control device, the turn-off semiconductor switches of each power inverter cell as a function of a plurality of setpoint values, wherein the setpoint values are generated such that a time-averaged energy value stored in a capacitor of a corresponding power inverter cells is predetermined by an operating point of the load and-or an operating mode of the modular multi-level power inverter. | 02-19-2015 |
20150055385 | MODULAR VOLTAGE SOURCE CONVERTER - A modular voltage source converter ( | 02-26-2015 |
20150055386 | Power Inverter - In a power inverter, a coolant passage is fixed to a chassis to cool the chassis; the chassis is divided into a first region and a second region by providing the coolant passage in the chassis; a power module is provided in the first region as fixed to the coolant passage; a capacitor module is provided in the second region; and the DC terminal of the capacitor module is directly connected to the DC terminal of the power module. | 02-26-2015 |
20150055387 | Battery Energy Storage and Power System - Battery energy storage arranged to be connected to a direct current capacitor, which is connected in parallel to a power converter. The battery energy storage includes a battery module and a controllable voltage source adapted to inject a voltage opposite to a voltage ripple of the direct current capacitor. A power system including such battery energy storage and a direct current capacitor is also disclosed. | 02-26-2015 |
20150070956 | INVERTER AND DIRECT CURRENT BUS VOLTAGE REGULATING METHOD THEREOF AND APPLICATION USING THE SAME - An inverter and a direct current (DC) bus voltage regulating method thereof are provided. The inverter includes a resonant conversion circuit, an inverting circuit, a first control circuit and a second control circuit. The resonant conversion circuit receives a DC input voltage and converts the same into a DC bus voltage. The inverting circuit couples to the resonant conversion circuit, and configured to convert the DC bus voltage into an AC output voltage. The first control circuit is configured to control operations of the resonant conversion circuit, where the first control circuit calculates a best working voltage of the resonant conversion circuit based on the DC input voltage and a resonant frequency of the resonant conversion circuit. The second control circuit controls operations of the inverting circuit, where the second control circuit receives the best working voltage calculated by the first control circuit and regulates the DC bus voltage accordingly. | 03-12-2015 |
20150078053 | SINGLE-PHASE CYCLOCONVERTER WITH INTEGRATED LINE-CYCLE ENERGY STORAGE - A method and apparatus for line-cycle storage of a single-phase cycloconverter. The method includes receiving input power from an input port of the singe-phase cycloconverter and monitoring an AC output port of the single-phase cycloconverter. The method measures energy stored in a line-cycle energy storage circuit coupled to one line of the AC output port of the single-phase cycloconverter, and determines a phase difference between a monitored AC voltage of the AC output port and the measured voltage of the line-cycle energy storage circuit. The method controls switches in the single-phase cycloconverter to selectively store energy in the line-cycle energy storage circuit based on the phase difference. | 03-19-2015 |
20150085550 | BIDIRECTIONAL CONVERTER WITH PREFERENTIAL DIRECTION AND REACTIVE POWER-CAPABLE INVERTER HAVING SAID CONVERTER - A half-bridge of a bidirectional converter is divided into a first and a second conduction path connected in parallel. In each of the conduction paths a switching element and a freewheeling diode are connected in series, and the center points of the conduction paths are connected via a second inductor. The second inductor is connected in series with a first inductor which is connected to the center point of the second conduction path. The half-bridge has two operating modes. In each of the two operating modes the switching element in one of the two conduction paths is clocked at a high frequency to cause a flow of energy in one of two directions between a pair of high voltage-side connections and a pair of low voltage-side connections to the half-bridge. The two switching elements are of different types, the switching element in the first conduction path causing higher switching losses. | 03-26-2015 |
20150092467 | Driver Circuit for a Pair of Semiconductor Switches in a Leg of a Three-Level Inverter Half-Bridge - A three-level driver circuit for an inverter half-bridge includes an output inverter half-bridge, which has four switches in series. The switches are controlled by signals from a switch controller applied via gate drivers. Switch delay times are taken into consideration to prevent short-circuiting when dimensioning the switching constellations of the switches. | 04-02-2015 |
20150103574 | POLY-PHASE INVERTER WITH INDEPENDENT PHASE CONTROL - A converter system and inverter system are disclosed with individual real and reactive power control for each phase of a poly-phase system. The converter system includes a controller, bidirectional single-phase inverters with AC sides coupled to an AC line filter and DC sides connected in parallel to a link capacitor coupled to DC/DC converters. Each inverter handles a separate AC phase. The controller controls the inverters and DC/DC converters so the current amplitude of each AC phase is independent, and the phase difference of each AC phase is independent. The inverters can be galvanically isolated between the DC and AC sides. The inverters can be non-isolated inverters having line and neutral connectors coupled to an isolated transformer winding, and the output windings of the transformer can be wired in a Wye configuration. The inverters can have local controllers. | 04-16-2015 |
20150103575 | SOLAR PHOTOVOLTAIC POWER CONVERSION SYSTEM AND METHOD OF OPERATING THE SAME - A solar photovoltaic power conversion system is provided to convert a DC input voltage into an AC output voltage, which mainly includes an input capacitor bank, a first switching circuit, a second switching circuit, a first filtering circuit, a second filtering circuit, and a control circuit. The first switching circuit has a first power switch and a second power switch. The second switching circuit has a third power switch and a fourth power switch. The control circuit produces a first control signal, a second control signal, a third control signal, and a fourth control signal to respectively control the first power switch, the second power switch, the third power switch, and the fourth power switch so as to reduce leakage current of the DC input voltage caused by parasitic capacitance voltage. | 04-16-2015 |
20150138859 | SYSTEM AND METHOD FOR POWER CONVERSION - A power conversion system is presented. The power conversion system includes a power converter. The power converter includes at least two circuits, where each of the at least two circuits includes two or more phase legs, where each of the two or more phase legs includes at least two semiconductor switches. Also, the at least two circuits includes an interphase reactor configured to couple one of the two or more phase legs to at least one other phase leg in the two or more phase legs. Moreover, the power conversion system includes a controller configured to obtain a switching pattern for each of the at least two semiconductor switches of the at least two circuits and selectively switch each of the at least two semiconductor switches based on the obtained switching pattern to reduce a common mode signal in the power conversion system. Method for power conversion is also presented. | 05-21-2015 |
20150303828 | CONVERTER - A converter includes a first bridge arm, a second bridge arm, a switch circuit and a voltage clamp circuit. The first bridge arm includes a first switch unit and a second switch unit that are electrically coupled in series at an output terminal. The second bridge arm includes two voltage sources that are electrically coupled in series at a neutral point terminal. The switch circuit is disposed between the neutral point terminal and the output terminal. The voltage clamp circuit is electrically coupled to the output terminal, the neutral point terminal, and one of a positive input terminal and a negative input terminal, and is configured to clamp voltage across the switch circuit. | 10-22-2015 |
20150318797 | HALF BRIDGE CIRCUIT, FULL BRIDGE CIRCUIT CONSTRUCTED WITH HALF BRIDGE CIRCUIT, AND THREE-PHASE INVERTER CIRCUIT CONSTRUCTED WITH HALF BRIDGE CIRCUIT - In a half bridge circuit according to one aspect of the present disclosure, when a voltage between a first terminal and a third terminal or a voltage between the first terminal and the second terminal is greater than or equal to a threshold voltage, a current is passed from the second terminal to the third terminal or from the third terminal to the second terminal according to a polarity of the voltage between the second terminal and the third terminal. When the current is passed from the third terminal to the second terminal, the voltage between the second terminal and the third terminal changes with respect to the voltage applied between the first terminal and the third terminal within a range where the voltage between the first terminal and the third terminal is less than or equal to the threshold voltage. | 11-05-2015 |
20150318798 | ELECTRIC POWER CONVERTER WITH A VOLTAGE CONTROLLER AND A CURRENT CONTROLLER - An electric power converter for converting AC to DC power or DC to AC power is disclosed. The converter includes a circuit for controlling the voltage and the circuit for controlling the current separately. The voltage is controlled by the switching modules and the up-side controller using the calculated target voltage. The current is controlled by the current controller using the calculated target current. | 11-05-2015 |
20150318848 | SEGMENTED DRIVER FOR A TRANSISTOR DEVICE - A segmented driver including at least one drive pin and a sense pin, a driver circuit, a comparator, and a controller. The driver circuit activates a selected drive level between the drive pins and a reference node. The comparator compares a voltage of the sense pin with a threshold voltage and provides a threshold indication when the voltage of the sense pin reaches the threshold voltage. The controller commands the driver circuit to activate a first drive level in response to an off indication, and commands the driver circuit to switch to a second, lower drive level in response to the threshold indication. The driver circuit may be implemented using low resistive current devices. Multiple drive pins may be included, each for selectively activating a corresponding drive path to adjust drive level. The threshold voltage may be set using a current source and resistor, and may be adjusted for temperature. | 11-05-2015 |
20150349656 | Electric Power Conversion Apparatus - An electric power conversion apparatus includes a channel case in which a cooling water channel is formed; a double side cooling semiconductor module that has an upper and lower arms series circuit of an inverter circuit; a capacitor module; a direct current connector; and an alternate current connector. The semiconductor module includes first and second heat dissipation metals whose outer surfaces are heat dissipation surfaces, the upper and lower arms series circuit is disposed tightly between the first heat dissipation metal and the second heat dissipation metal, and the semiconductor module further includes a direct current positive terminal, a direct current negative terminal, and an alternate current terminal which protrude to outside. The channel case is provided with the cooling water channel which extends from a cooling water inlet to a cooling water outlet, and a first opening which opens into the cooling water channel. | 12-03-2015 |
20150349661 | MODULAR INVERTER PLATFORM PROVIDING PHYSICAL AND ELECTRICAL CONFIGURABILITY AND SCALABILITY - Modular inverter platforms and methods for providing physical and electrical configurability and scalability are disclosed. The modular inverter apparatus includes a printed circuit board (PCB) comprising at least two modules and one or more mounting components structured to switch the at least two modules between a plurality of physical configurations. The modular inverter apparatus also includes a plurality of electrical interconnections structured to electrically connect the at least two modules and to switch the at least two modules between a plurality of electrical configurations. | 12-03-2015 |
20150349663 | Power Conversion Apparatus - The power conversion apparatus includes a DC to AC conversion device which enables conversion between a DC voltage and an AC voltage, periodically changes a magnitude of a DC voltage of the DC to AC conversion device according to a period of a voltage of the interconnected AC voltage system, and allows a portion of an output AC voltage to be substituted with the periodic change in the DC voltage so as to be output, in which means for controlling the DC voltage according to a phase having the highest successive amplitude among three-phase AC voltages which are voltages of the interconnected AC voltage system. | 12-03-2015 |
20150364984 | POWER SUPPLY APPARATUS FOR POWER CONVERTERS - In a power supply apparatus, an upper-arm control unit includes a first switching element connected between a DC power source and a primary side of each upper-arm transformer. The upper-arm control unit controls on and off operations of a first voltage-controlled switching element to control supply of an output voltage of the DC power source to the primary side of each upper-arm transformer. A lower-arm control unit includes a second voltage-controlled switching element connected between the DC power source and a primary side of the at least one lower-arm transformer. The lower-arm control unit controls on and off operations of a second switching element to control supply of the output voltage to the primary side of the at least one lower-arm transformers. Each upper-arm transformer is arranged adjacent to the upper-arm control unit, and the at least one lower-arm transformer is arranged adjacent to the lower-arm control unit. | 12-17-2015 |
20150381075 | DIRECT CURRENT VOLTAGE CONVERSION DEVICE AND CLAMPING CIRCUIT - A direct current voltage conversion device includes a direct current to alternating current converter, a transformer, a first converter switch, a second converter switch and a clamping circuit. The clamping circuit clamps a voltage across the second converter switch to a preset value, and stores energy of a voltage peak across the second converter switch. | 12-31-2015 |
20150381076 | ELECTRICAL ARCHITECTURE FOR CONVERTING DC VOLTAGE INTO AC VOLTAGE, AND VICE VERSA - An electrical architecture ( | 12-31-2015 |
20160013735 | WIDE POWER RANGE RESONANT CONVERTER | 01-14-2016 |
20160013736 | CONVERTER SYSTEM | 01-14-2016 |
20160020684 | POWER SUPPLY DEVICE - A power supply device includes a first inverter that converts a first direct-current voltage into a first alternating-current voltage and outputs the first alternating-current voltage, and a second inverter that has an output connected in series with an output of the first inverter and converts a second direct-current voltage into a second alternating-current voltage synchronized with the first alternating-current voltage and outputs the second alternating-current voltage. | 01-21-2016 |
20160036430 | INTELLIGENT GATE DRIVE UNIT - An intelligent gate drive unit and related method for controlling one or more semiconductor switches of one or more power modules, the intelligent gate drive unit comprises at least a gate driver and an analog measuring circuit, wherein the gate driver facilitates control of the one or more semiconductor switches and wherein the analog measuring circuit facilitates measuring the switch voltage when the one or more semiconductor switches are in a conducting mode. | 02-04-2016 |
20160043626 | POWER SUPPLY SOURCE FOR AN ELECTRIC HEATING SYSTEM - The invention relates to power engineering, in particular to electric heating systems for residential and other buildings. The power supply source for an electric heating system comprises an inductance coil ( | 02-11-2016 |
20160065089 | THREE-PHASE CURRENT CONVERTER WITH VARIED INDUCTANCES AND THREE-PHASE D-SIGMA CONTROL METHOD THEREOF - A three-phase current converter and a three-phase D-Σ control method with varied inductances are provided. In this method, two current variations of a first phase current, a second phase current and a third phase current flowing through a first inductor, a second inductor and a third inductor of the three-phase current converter respectively and two phase voltages of a first phase voltage, a second phase voltage and a third phase voltage are obtained. A first calculation is executed according to inductances of the inductors, the current variations and a switching period of a vector space modulation to obtain a calculation result. A second calculation is executed according to the phase voltages and the calculation result to obtain a duty ratio of the switching period of switch sets of the three-phase current converter. The inductances vary with the phase currents respectively. | 03-03-2016 |
20160105129 | TRANSFORMER ELECTRICAL CIRCUIT AND INSTALLATION COMPRISING SUCH A CIRCUIT - An electric transformer circuit for connecting electrical equipment, such as a renewable energy-based generator or an energy storage system, to an electric grid. The circuit includes a first voltage converter connected to the equipment; a transformer connected to the first converter and a second voltage converter connected to the transformer and the electric grid. The transformer is a weakly coupled transformer, the magnetic coupling between the first coil and the second coil being less than 0.7. The transformer includes a first and second capacitor respectively associated with a first and second coil so as to form, with the corresponding coil, a circuit resonating at frequency f | 04-14-2016 |
20160105130 | SEMICONDUCTOR DEVICE AND INVERTER SYSTEM - A semiconductor device includes first and second resistor groups, first and second switch groups, a register, and an amplifier. The first resistor group includes plural first resistors connected in series between a first terminal and an output of the amplifier. The first switch group includes plural first switches. Each of the first switches is connected between a corresponding one of the connection point between the first resistors and the inverting input terminal of the amplifier. The second resistor group includes plural second resistors connected in series between a second terminal of the amplifier and a reference voltage source. The second switch group includes plural second switches. Each of the second switches is connected between a corresponding one of the connection point between the second resistors and a positive input terminal of the amplifier. The register selects each of first and second switches. | 04-14-2016 |
20160118911 | VOLTAGE COMPENSATING METHOD FOR CONVERTER - A voltage compensating method is applied to a converter for converting a DC voltage into an AC voltage. The converter includes a first switch module, a second switch module, and an inductor. In a first dead time period, detect a first current value related to the inductor. According to the first current value, calculate a second current value and a third current value related to the inductor. According to polarities of the first, second and third current values, determine an output mode of the converter indicating a voltage compensation model after the first dead time period. According to the voltage compensation model, the first current value, and the second current value or the third current value, calculate a voltage compensation value. In a second dead time period, adjust a switching time for the first switch module and the second switch module according to the voltage compensation value. | 04-28-2016 |
20160126863 | INVERTER DEVICE - An inverter device includes: a step-up circuit; an inverter circuit; a control unit for controlling the step-up circuit and the inverter circuit; and a reactor provided on an electric path for outputting the converted AC power to an AC system. An output current target value is calculated based on an input power value of DC power and a voltage value of the AC system, and a current target value and a voltage target value for the inverter circuit are calculated based on the output current target value, to control the inverter circuit. A current target value for the step-up circuit is calculated based on a current target value and a voltage target value that are common with the inverter circuit, and on a DC input voltage value, to control the step-up circuit. Thereby, output of the AC power is controlled. | 05-05-2016 |
20160149513 | POWER CONVERSION APPARATUS - A power conversion apparatus | 05-26-2016 |
20160190915 | Semiconductor power module and power conversion apparatus using the same - A semiconductor power module with which it is possible to suppress the influence of noise given from a main terminal to a control terminal is provided. At least any one of main terminals (positive electrode terminal, negative electrode terminal, alternating current terminal) is so configured that the main terminal includes two parts extended in a common direction. The two parts are, for example, formed of a single component having such as a shape that the component is bifurcated from the outside toward the inside of the semiconductor power module or two different components. The two parts are so structured that the parts are extended in a common direction. Control terminals (gate signal terminal and emitter signal terminal) are so arranged that a laminated portion of the control terminals is sandwiched between one and the other of the two parts to configure the semiconductor power module. | 06-30-2016 |
20160204698 | DC POWER SOURCE, AND DC POWER SOURCE CONTROL METHOD | 07-14-2016 |
20160254206 | POWER CONVERTER | 09-01-2016 |
20160380557 | ASSEMBLY AND METHOD FOR DISCHARGING HIGH-VOLTAGE CIRCUIT OF POWER INVERTER - An assembly and a method for discharging a high voltage circuit of a power inverter which can automatically detect, when connection to the power inverter is interrupted, a dangerous state due to high energy accumulated in the power inverter and remove the danger as rapid as possible, and which can reduce power loss and the number of required corresponding components. The assembly includes a logic unit. The logic unit includes first input units which are coupled to a voltage sensor and a current sensor, and an output unit which outputs a discharge control signal. The output unit is coupled to an input unit of a means for triggering circuit breakers. The means for triggering the circuit breakers includes output units for outputting a driver signal. The output units are coupled to at least one of the circuit breakers of the half bridge. | 12-29-2016 |