| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 363052000 | For rectifiers | 41 |
| 20130044523 | Power supply having a surge protection circuit - A power supply having a power protection circuit has a rectification circuit and a converter. An input terminal of the rectification circuit is connected with the AC mains. A first voltage dependent resistor is connected with the AC mains. The converter has a transformer. A primary side of the transformer is connected with an output terminal of the rectification circuit, and the secondary side is connected to a power output terminal and a ground terminal. A Y capacitor is connected between the primary side of the transformer and the ground terminal. A surge protection module is connected between the first voltage dependent resistor and the Y capacitor. When a surge occurs between the primary and secondary sides of the transformer, a surge current is shunted by the surge protection module to the ground terminal through the Y capacitor without damaging internal components or circuits inside the power supply. | 02-21-2013 |
| 20100073973 | Device for protection of power factor correction in three phase power supply and control method thereof - A power factor correction (PFC) protection device used when an abnormal current of a three-phase inverter occurs and a method of controlling the same are disclosed. If any mis-connection (or non-connection) occurs due to a mistake of a producer at a power-supply input terminal applied to the reactor and the switching element, a current applied to the switching element becomes an abnormal current, such that the PFC cannot be controlled. During the PFC control, the device detects a current waveform generated from the switching element at a current sensor of the common potential terminal, and determines whether there is a mis-connection caused by the abnormal current. If the mis-connection is decided, the device compares a current pattern with a mis-connection pattern, and changes the PFC control output applied to the switching element according to the searched mis-connection pattern, such that the PFC control can be normally carried out. | 03-25-2010 |
| 20090279329 | DIGITAL LATCH CONTROL CIRCUIT FOR OVER-VOLTAGE PROTECTION AND POWER CONVERTER USING THE CONTROL CIRCUIT - An AC/DC power supply with over-voltage protection includes a voltage converting circuit and a digital latch control circuit. The voltage converting circuit has a first-side winding, a second-side winding, and an auxiliary winding for providing a supply voltage according to the AC input voltage. The digital latch control circuit is coupled to the voltage converting circuit and utilized for latching a voltage level of the supply voltage at a first predetermined level according to an over-voltage protection (OVP) trigger signal, where the voltage converting circuit is disabled when the voltage level is latched at the first predetermined level. | 11-12-2009 |
| 20090154204 | REVERSE BIASING ACTIVE SNUBBER - The present invention provides a transient suppression circuit for use with a rectifier coupled to a transformer. In one embodiment, the transient suppression circuit includes a triggering section configured to provide a timing signal corresponding to a dead time of the rectifier. Additionally, the transient suppression circuit also includes a biasing section coupled to the triggering section and configured to apply a reverse bias voltage to the rectifier based on the timing signal. | 06-18-2009 |
| 20130063989 | INTERFACE ARRANGEMENT BETWEEN AC AND DC SYSTEMS USING GROUNDING SWITCH - An interface arrangement for connection between an AC system and a DC system and to a method of disconnecting a DC system from an AC system are disclosed. The arrangement includes a converter for conversion between AC and DC having a DC side for connection to the DC system and an AC side for being coupled to the AC system, a set of circuit breakers coupled between the AC side of the converter and the AC system and a breaker assisting unit including a set of branches connected between the AC side of the converter and ground, where each branch includes a switch in series with an impedance element. | 03-14-2013 |
| 20100039838 | ELECTROSTATIC DISCHARGE CONDUCTING PATHWAY HAVING A NOISE FILTER SPARK GAP - A printed circuit board includes a primary region, a secondary region and an isolation region disposed between the primary region and the secondary region to galvanically isolate the primary region from the secondary region. The primary region is to be coupled to an AC source. The primary region also includes an electrostatic discharge (ESD) conducting pathway to redirect current to the AC source that crosses the isolation region. A spark gap is included in the ESD conducting pathway to filter noise and to provide a current path to the AC source for the current that crosses the isolation region. | 02-18-2010 |
| 20090103336 | CONTROL APPARATUS - The present invention provides a control apparatus for detecting an early stage short circuit between the terminals of an electrolytic capacitor, and detecting a short circuit between a load that is connected in parallel to the electrolytic capacitor, the apparatus performing appropriate processing before an adverse effect is inflicted on peripheral equipment. In the control apparatus, microcomputers switch on a second relay; an electrolytic capacitor is gradually charged via a current-limiting resistor; a first voltage detection control for detecting a voltage between terminals of the electrolytic capacitor is performed when a first set time period has elapsed after the second relay has been switched on; and a second voltage detection control for detecting a voltage between the terminals of the electrolytic capacitor is performed when a second set time period, which is longer than the first set time period, has elapsed after the second relay has been switched on. | 04-23-2009 |
| 20100277959 | POWER SUPPLY MODULE - A power supply module includes a rectifying and filtering unit, a pulse width modulation (PWM) unit, a voltage transforming unit, a sampling and comparing unit, and an overvoltage protection unit. The rectifying and filtering unit receives an alternating current (AC) voltage, and generates a filtered primary DC voltage. The PWM unit is configured for generating pulses. The voltage transforming unit transforms the filtered primary DC voltage into the DC voltage according to the pulses. The sampling and comparing unit samples the DC voltage, and generates an overvoltage signal when the sampled DC voltage exceeds a predetermined DC voltage. The overvoltage protection unit is coupled between the sampling and comparing unit and the PWM unit. According to the overvoltage signal, the overvoltage protection unit generates a first control signal to disable the PWM unit, and the overvoltage protection unit is self-locked. | 11-04-2010 |
| 20090129129 | Switching power supply device - A switching power supply device | 05-21-2009 |
| 20110110128 | Preventing metal oxide varistor (MOV) from releasing smoke, smell, and/or sound - A system includes an electrical component, a MOV, a voltage sensor, and a circuit. The MOV is connected in parallel to the electrical component. The voltage sensor detects a voltage over the MOV and the electrical component. The circuit removes power in response to the voltage sensor detecting the voltage over the MOV and the electrical component being greater than a threshold voltage for a length of time greater than a threshold length of time. Removing power prevents the MOV from releasing one or more of smoke, smell, and sound. The MOV is thus not damaged as a result of a power surge. The system may be a power supply, or another type of electrical system. The electrical component may be a capacitor, or another type of electrical component. | 05-12-2011 |
| 20110058397 | SYSTEMS AND METHODS FOR POLYPHASE ALTERNATING CURRENT TRANSFORMER INRUSH CURRENT LIMITING - An inrush current protection circuit for a polyphase alternating current power system may include a plurality of current limiting resistors, each of which is electrically coupled in series between a respective one of a plurality of phases of the polyphase alternating current power source and a respective input of a polyphase transformer rectifier unit. The circuit may also include a plurality of power switches, each of which is electrically coupled in parallel with a respective one of the current limiting resistors, such that when each of the power switches is closed, essentially no electrical current flows through the respective current limiting resistor. The circuit may also include a power switch controller configured to control each of the power switches to be open such that an inrush current passes through the respective current limiting resistor rather than the power switch, and to be closed after a time delay has passed. | 03-10-2011 |
| 20100328973 | AC COUPLED SWITCHING POWER SUPPLY AND METHOD THEREFOR - A circuit for converting high voltage AC to low voltage DC has an input capacitor coupled an input AC source. A rectifier is coupled to the input capacitor. A switch is coupled to the rectifier. A voltage regulator is coupled to the switch. The voltage regulator regulates an output of the circuit by closing the switch when a rising edge of a rectified AC voltage is below an output voltage and opens the switch when the output voltage reaches a regulation voltage. A storage capacitor is coupled to the switch. | 12-30-2010 |
| 20100033997 | TIMED ELECTRICAL OUTLET AND A METHOD OF OPERATION THEREOF - A timed electrical outlet (or pluggable apparatus) and a method of operation thereof. The electrical outlet (or pluggable apparatus) includes a current sensor, a counter, and an electrical switch. When an electrical load is plugged into the electrical outlet (or pluggable apparatus), the current sensor senses the flow of current and triggers the counter to start counting. When the counter is finished counting, the counter triggers the electrical switch, opening the current path within the electrical outlet (or pluggable apparatus) such that electrical current no longer flows to the electrical load. | 02-11-2010 |
| 20110249476 | VOLTAGE DETECTOR AND PROTECTION APPARATUS USING THE SAME - A voltage detector includes a zener diode having a cathode connected to a detect terminal of the voltage detector, a junction field effect transistor having an input terminal connected to an anode of the zener diode, and a resistor connected between an output terminal and a control terminal of the junction field effect transistor. When the voltage on the detect terminal is higher than the breakdown voltage of the zener diode, the junction field effect transistor produces a current flowing through the resistor, and thereby a detection signal can be obtained from the voltage across the resistor. | 10-13-2011 |
| 20090021966 | METHODS AND APPARATUS FOR A CASCADE CONVERTER USING SERIES RESONANT CELLS WITH ZERO VOLTAGE SWITCHING - A method of providing power to a load is provided. A first series resonant converter is provided. A second SRC is operably coupled to the first SRC in a cascade connected arrangement. First and second zero voltage switching (ZVS)-assistance networks are operably coupled between the first SRC and the second SRC, such that the first and second ZVS-assistance networks are providing first and second ZVS-assistant currents flowing from each ZVS-assistance network to the cascade connected arrangement of SRCs. Power from a power source is received at the cascade connected arrangement of first and second SRCs, power from a power source. The cascade connected arrangement of first and second SRCs supplies an output voltage to the load in response to receiving power from the power source. | 01-22-2009 |
| 20100165677 | Electronic device having a circuit protection unit - An electronic device includes a circuit protection unit providing over-current protection to a main circuit and including a series connection of first and second current limiting circuits, and a normally-open branch circuit coupled in parallel to the first current limiting circuit and operable to conduct when a voltage across the first current limiting circuit reaches a first predetermined threshold voltage not greater than an endure voltage of the first current limiting circuit. Prior to conduction of the branch circuit, the first current limiting circuit maintains a current flowing therethrough at a first limit value when a current flowing through the main circuit reaches the first limit value. Upon conduction of the branch circuit, the second current limiting circuit maintains a current flowing therethrough at a second limit value greater than the first limit value when the current flowing through the main circuit reaches the second limit value. | 07-01-2010 |
| 20090154205 | SNUBBER CAPACITOR RESETTING IN A DC-TO-DC CONVERTER - A DC-to-DC converter and associated methods are provided for controlling the discharge of snubber capacitances during a light/no load buck mode of operation. An operating method for a DC-to-DC converter detects conditions corresponding to a light/no load buck mode of operation, and, in response to the detection of that mode, controls the states of a first switch, a second switch, a first switched diode element, a second switched diode element, a third switched diode element, and a fourth switched diode element to facilitate discharging of a first capacitance element and a second capacitance element through a secondary winding of a transformer. | 06-18-2009 |
| 20130016541 | AC/DC CONVERTER STATION AND A METHOD OF OPERATING AN AC/DC CONVERTER STATIONAANM Norrga; StaffanAACI StockholmAACO SEAAGP Norrga; Staffan Stockholm SEAANM Jonsson; Tomas UAACI VasterasAACO SEAAGP Jonsson; Tomas U Vasteras SEAANM Shukla; AnshumanAACI VasterasAACO SEAAGP Shukla; Anshuman Vasteras SE - The present invention relates to an AC/DC converter station for interconnection of a DC transmission line and an AC network, the AC/DC converter station including an AC/DC converter and a control system configured to control the AC/DC converter. The AC/DC converter station comprises a capacitor connected in series between the AC/DC converter and the AC network, and a voltage measurement device arranged to measure the voltage across the capacitor. The AC/DC converter further comprises a control system connected to the voltage measurement device and arranged to receive, from the voltage measurement device, a signal indicative of a measured voltage. The control system is arranged to perform the control of the AC/DC converter in dependence of the signal received from the voltage measurement device. The invention further relates to a method of operating an AC/DC converter station. | 01-17-2013 |
| 363053000 | Semiconductor type | 23 |
| 20130044524 | PROTECTION CIRCUIT IN TRIAC APPLICATIONS - Aspects of the disclosure provide a circuit. The circuit includes a transistor configured to control energy entering the circuit from a power supply, a capacitor coupled with the transistor to store the energy that enters the circuit, and a protection circuit configured to counteract a voltage change of the transistor that is caused by a step voltage change in the power supply. In an embodiment, the protection circuit operates independent of the stored energy on the capacitor. | 02-21-2013 |
| 20130083572 | PROTECTION FOR INADVERTENT MISSING FEEDBACK VOLTAGE SIGNAL - Methods and apparatuses are disclosed for providing improved feedback sampling in a primary-side regulated power converter. A test sample may be taken prior to the default feedback sample. The voltage of the test sample may be compared to the voltage of the default feedback sample to determine if the voltage difference between the two samples exceeds a threshold. If the default sample is lower than the test sample by more than the threshold, the default sample may be flagged as being a potential false sample. If more than a set number of potentially false samples are obtained, the power converter may enter an auto-restart mode. | 04-04-2013 |
| 20100080022 | METHOD AND APPARATUS FOR PRE-CHARGING POWER CONVERTERS AND DIAGNOSING PRE-CHARGE FAULTS - Power conversion systems and diagnostic techniques are presented for detecting suspected converter faults when a pre-charge circuit is engaged during system startup, in which known or estimated system characteristics are used to derive expected converter voltage values or rate of change values and the levels are measured during startup to ascertain whether the pre-charge circuit or other converter components are faulted. | 04-01-2010 |
| 20120033465 | THERMAL SHUTDOWN UNIT, SWITCH CONTROLLER INCLUDING THE SAME, AND CONTROL METHOD OF THERMAL SHUTDOWN PROTECTION OPERATION - The present invention relates to a thermal shutdown unit, a switch controller including the same, and a method controlling a thermal shutdown protection operation. | 02-09-2012 |
| 20120294053 | METHOD FOR PROTECTING A CONVERTER AND A CONVERTER IMPLEMENTING THE METHOD - A method for protecting a converter device comprises the steps of: detecting an alternating current signal; when the alternating current signal is abnormal, generating an activating signal according to the abnormal alternating current signal; generating a control signal according to the activating signal; and controlling at least one synchronous rectifying power switch of the converter device according to the control signal. Furthermore, a converter device which implements the method is provided. | 11-22-2012 |
| 20090201705 | ENERGY CONVERTING APPARATUS, AND SEMICONDUCTOR DEVICE AND SWITCHING CONTROL METHOD USED THEREIN - The present invention reliably reduces output power during an overload, due to overload protection in which an on-time of a switching element | 08-13-2009 |
| 20120106212 | POWER CONVERTER - [Problem] To provide a power converter capable of suppressing voltage dropping of the smoothing capacitor and suppressing a rush current at the time of power recovery, | 05-03-2012 |
| 20100142235 | POWER CONVERSION DEVICE - Provided is a power conversion device capable of detecting a short circuit failure and protecting from the same securely. The power conversion device includes: a three-phase bridge type power conversion circuit including a semiconductor switch including a first main terminal, a second main terminal, and a control terminal; a control circuit for controlling an operation of the semiconductor switch; and a voltage detection circuit for monitoring a voltage between DC terminals of the power conversion circuit, in which the control circuit has a protection function of turning off the semiconductor switch if the voltage between the DC terminals of the power conversion circuit, which is detected by the voltage detection circuit, is lower than a predetermined value for a predetermined period of time or longer. | 06-10-2010 |
| 20110141776 | Power Supply with Output Overcurrent Detection and Error Latch Protection - A power supply employs an error detecting circuit to output an error signal when detecting an overvoltage or overcurrent occurred in one of output powers and employs a latch trigger circuit to cause the power supply to enter a latch mode when receiving the error signal. The power supply will keep the latch mode when entering the latch mode until the AC power VAC is removed. In addition, the power supply employs the error detecting circuit to provide the accurate safety threshold value by the constant current source with temperature compensation function and stable constant current output. | 06-16-2011 |
| 20110110129 | CIRCUIT ARRANGEMENT AND CONTROL CIRCUIT FOR A POWER-SUPPLY UNIT, COMPUTER POWER-SUPPLY UNIT AND METHOD FOR SWITCHING A POWER-SUPPLY UNIT - A circuit arrangement for a power-supply unit for generating at least one DC voltage from an AC voltage of a power grid includes a switching element that switches a load current of the power-supply unit, a current-limiting element connected in series to the switching element that limits a current surge when the switching element is turned on, a bistable first relay connected in parallel to the switching element and the current-limiting element that retains the load current, and a control circuit that switches the power-supply unit from a first operating state, in which no load current flows from the power grid to the power-supply unit, to a second operating state in which a load current for generating a DC voltage flows from the power grid to the power-supply unit, wherein the control circuit turns on the switching element for a first time period during switching of the power-supply unit from the first to the second operating state, to turn the bistable relay on during the first time period, and to turn the switching element off at the end of the first time period. | 05-12-2011 |
| 20110122664 | POWER FACTOR CORRECTION TYPE SWITCHING POWER SUPPLY UNIT - A soft-stop overvoltage protection circuit, into which a soft-stop overvoltage detection voltage proportional to a direct current output voltage is input, reduces the output of a multiplier in accordance with the soft-stop overvoltage detection voltage when the soft-stop overvoltage detection voltage exceeds a first threshold value. An overvoltage protection circuit, a second threshold value higher than the first threshold value being set, compulsorily turns off a switching element by outputting an overvoltage detection signal when the soft-stop overvoltage detection voltage exceeds the second threshold value. The soft-stop overvoltage protection circuit compulsorily increases the output of a voltage error amplifier circuit on the output voltage decreasing. When the output of the voltage error amplifier circuit increases suddenly, and the output voltage rises excessively, the soft-stop overvoltage protection circuit decreases the output of the multiplier, thus curbing the rise of the output voltage. | 05-26-2011 |
| 20100054003 | OUTPUT PROTECTION CIRCUIT OF A POWER CONVERTER - An output protection circuit used for a power converter having an operational amplifier, a diode, a number of voltage-dividing resistors, and a switch tube. In this circuit, the voltage-dividing resistors are connected in series to form a voltage-dividing network, of which one node is connected to a reference level end Vref of a PWM control module of the converter, while the other node is grounded. A voltage dividing point M is coupled to an inverting input end of the operational amplifier AR | 03-04-2010 |
| 20120201058 | MOBILE DEVICE ADAPTER AND CHARGER - Systems and methods are presented for an improved high power density power adapter. On one potential embodiment, an improved power adapter includes an AC input; a rectifier coupled to the AC input; a power factor correction circuit coupled to the rectifier; and a burst switch circuit coupled to the power factor correction circuit. The burst switch circuit provides power to a DC output via a set of FET drivers, a set of FETs, and a transformer and may provides power exclusively in a burst mode using a feedback input from the DC output. The transformer may be composed of windings coupled to the set of FETs, and additional windings embedded in the PCB and coupled to the first winding. Certain windings may comprise a conductive ribbon that loops around a transformer core. Additional embodiments may include monitoring circuits and multiple outputs. | 08-09-2012 |
| 20120201059 | FAULT CURRENT LIMITATION IN DC POWER TRANSMISSION SYSTEMS - A method, voltage source converter and computer program product for limiting the current in a DC power transmission system are disclosed. The voltage source converter has an AC side and a DC side and a fault current path between these sides. It furthermore includes a control unit and at least one switching unit of a first type provided in the fault current path and that includes a primary switching element together with an anti-parallel secondary controllable rectifying element. Based on a fault being detected in the DC power system when the primary switching elements of the converter are blocked, the control unit changes the control of the controllable rectifying element from acting as a non-controllable rectifying to acting as a controllable rectifying element. | 08-09-2012 |
| 20120020124 | APPARATUS FOR DETECTING SHORT-CIRCUIT OF OUTPUT DIODE IN CONVERTER - An apparatus comprises: a voltage monitoring unit for monitoring input direct-current voltages of first and second converters whose output ends are connected in parallel to each other; and a judgment control unit for judging that an output diode of the first converter is short-circuited, when an input direct-current voltage monitored by the voltage monitoring unit with respect to the first converter rises up to a post-step-up voltage stepped up by the second converter during a step-up operation of the second converter. | 01-26-2012 |
| 20120120689 | FAULT TOLERANT DC POWER SYSTEMS - A fault tolerant DC power system includes a permanent magnet generator (PMG), a first contactor in electrical communication with the PMG, an active rectifier in electrical communication with the first contactor, a second contactor in electrical communication with the first contactor, and a motor drive in electrical communication with the second contactor. The first contactor is configured to sever electrical communication between the PMG and the active rectifier and the second contactor is configured to establish electrical communication between the PMG and the motor drive. | 05-17-2012 |
| 20120268973 | POWER REGULATING APPARATUS - Disclosed is a power regulating apparatus, which is connected between an AC power and a load, for supplying the regulated AC power to the load. The power regulating apparatus includes a first regulating means provided to regulate the input AC power source when the AC power is at a normal power level, and a second regulating means provided to transmit an electric power to the load from a power storage means when the AC power is at a power level lower than the normal power level. Thus, the power regulating apparatus is capable of providing the load with an expected high quality electric power in all cases of AC power variation. | 10-25-2012 |
| 20110157930 | POWER INPUT STABILIZING CIRCUIT - The power input stabilizing circuit provides a first resistor at the input terminals to suppress impulse current. Then, the power passes through a power input limiting circuit including a non-polarity capacitor, a rectifier circuit formed by diodes, and a polarity capacitor so as to provide a current within a specific range to a load. A constant current circuit including a third resistor, a diode, a fourth resistor, and a transistor is then employed to stabilize the load current. The performance and durability of the electrical or electronic appliance using the power input stabilizing circuit are therefore enhanced significantly. | 06-30-2011 |
| 363054000 | Thyristor | 5 |
| 20090147552 | SYSTEMS AND METHODS INVOLVING BALANCING CURRENTS FOR THYRISTORS - An exemplary embodiment includes a method for balancing thyristor bridge circuits, the method comprising, determining currents of thyristors in a first leg of thyristors of a thyristor bridge circuit, determining a first set of gate firing times for the thyristors in the first leg of thyristors responsive to determining the current of the thyristors in the first gate of thyristors, wherein the first set of gate firing times are operative to balance a current load between the thyristors in the first leg of thyristors, and gating the thyristors in the first leg of thyristors according to the first set of gate firing times. | 06-11-2009 |
| 20100085785 | Method For Limiting Damage To A Converter Having Power Semiconductors In The Case Of A Short Circuit In The DC Voltage Intermediate Circuit - A device for converting an electric current has a phase module, which in turn has an alternating current connection and at least one direct current connection connected to an intermediate direct current circuit. The device further has an energy accumulator. A phase modulation path is formed between each direct current connection and each alternating current connection. Each phase modulation path has a series connection of submodules, which each have a power semiconductor. A semiconductor protective device is provided in parallel connection to power semiconductors of each submodule. A control unit actuates the semiconductor protective device, and energy accumulator(s) are equipped for supplying energy to the control unit. The device safely prevents damage from a short circuit on the direct-current side, even when the supply grid is connected, because a direct current connection of each phase module is connected to the intermediate direct current circuit via a direct-current switch. | 04-08-2010 |
| 20090073728 | POWER CONVERTER AND METHOD, AND TRIANGLE WAVE GENERATING CIRCUIT - A power converter that converts an AC power outputted from a generator into a DC power and supplies it to a battery (load). The power converter includes a thyristor (switch unit) connected between an output unit of the generator and the battery (load); and a gate control unit (control unit) for generating a triangle wave voltage having a constant peak voltage corresponding to each cycle of the AC power outputted from the generator, generating a differential voltage between the voltage supplied to the load via the switch unit and a predetermined target voltage, and controlling the conductive state of the switch unit based on the triangle wave voltage and the differential voltage. | 03-19-2009 |
| 20110235375 | APPARATUS HAVING A CONVERTER - A device has a converter which is connected to a direct voltage circuit through a short-circuit protection unit. The short-circuit protection unit is arranged at least partially in the direct voltage circuit and is provided in the direct voltage circuit to suppress short-circuit current flowing through the converter. The device contains one or more controllable power semiconductors, wherein a protection element is arranged in parallel to at least one of the controllable power semiconductors. The device prevents the negative effects of a short circuit occurring in the direct voltage network in a particularly reliable manner. For this purpose, the protection element is an energy store. | 09-29-2011 |
| 20120087161 | POWER SUPPLY CONNECTED IN PARALLEL WITH A POWER SWITCH FOR THE CONTROL CIRCUIT THEREOF - A power converter circuit for generating a supply voltage for a power semiconductor switch. A series circuit formed of a diode unit having diodes connected in reverse and a protection circuit is connected in parallel with the power semiconductor switch. The diode voltage generates a feed voltage that is transformed, rectified, and provided as a supply voltage. | 04-12-2012 |
