| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 363053000 | Semiconductor type | 62 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 20130201735 | AC-DC CONVERTER WITH ADAPTIVE CURRENT SUPPLY MINIMISING POWER CONSUMPTION - A circuit arrangement with standby mode minimising power and/or current consumption having a mains AC power supply terminals and an active circuit capable of converting said mains AC power to lower voltage DC levels for operating in an active mode or in a standby mode as required by an appliance such that the selection of the current sensing resistor value for said current sensing resistor limits the maximum peak current through the FET so that the current sensing resistor arrangement is capable of providing significant increases in a steeper rise time of the current at around mains AC power supply zero crossing, so that current is pulled high while the mains AC power supply voltage is low. | 08-08-2013 |
| 20130223111 | DIGITAL CONTROL CIRCUIT FOR RESONANT POWER CONVERTERS - A resonant control circuit for a power converter is provided. The resonant control circuit includes a microcontroller, a switching-signal timer, a first PWM timer, and a signal detection circuit. The microcontroller has a memory circuit, and the memory circuit includes a program memory and a data memory. The switching-signal timer generates a first switching signal coupled to switch a transformer. The first PWM timer generates a PWM signal coupled to control a synchronous rectifying transistor of the power converter for synchronous rectifying. The signal detection circuit is coupled to an output of the power converter for generating a feedback data from a feedback signal. The microcontroller controls the first switching signal by programming the switching-signal timer in accordance with the feedback data. The microcontroller controls the first PWM signal by programming the first PWM timer in response to the first switching signal. | 08-29-2013 |
| 20130279219 | POWER CIRCUIT - A power circuit includes a first and a second switches between a input terminal and a reference power source; an inductor between a output terminal and a node between the first and the second switches, a main capacitor coupled to the output terminal, a main switch between the inductor and the output terminal, a sub capacitor coupled to a node between the inductor and the main switch through a sub switch, and a control circuit. And the control circuit performs: switching operation of the first and the second switches, and suspension operation that maintains an off-state of the first and the second switches after switching operation; the switching operation on the main capacitor by switching on the main switch; the switching operation on the sub capacitor by switching on the sub switch; and the switching operation by switching on the main switch and the sub switch. | 10-24-2013 |
| 20130294122 | POWER SUPPLY DEVICE - A power supply device includes a converter, a rectifier circuit, a voltage cycle detection circuit, and a power supply cutoff signal output unit. The converter converts an AC voltage inputted from an external power supply to a DC voltage and outputs the DC voltage. The rectifier circuit rectifies the AC voltage inputted from the external power supply and outputs a rectified waveform voltage. The voltage cycle detection circuit detects a voltage cycle in which the rectified waveform voltage reaches a predetermined threshold value and, when the voltage cycle is detected to be longer than a predetermined cycle, outputs a voltage cycle abnormality signal. The power supply cutoff signal output unit outputs a power supply cutoff signal when the voltage cycle abnormality signal is inputted. | 11-07-2013 |
| 20130308356 | INPUT RELAY ARCHITECTURE FOR RECTIFYING POWER CONVERTERS AND SUITABLE FOR AC OR DC SOURCE POWER - Power converter circuitry for converting power from a power source of any one of a number of power source types, and in which arcing at relays in the event of a shutdown is avoided. A shunt circuit is provided in inrush and protection circuitry of the power converter, the circuit including a power field-effect transistor and optionally a series-connected relay. The shunt circuit is controlled to divert current from the main relay in the event of a rectifier fault, allowing the main relay to be opened under reduced or zero current. The field-effect transistor of the shunt circuit can then be safely opened, allowing its series relay to be opened under zero current conditions. | 11-21-2013 |
| 20130329472 | POWER FACTOR CORRECTION (PFC) POWER CONVERSION APPARATUS AND POWER CONVERSION METHOD THEREOF - A power factor correction (PFC) power conversion apparatus and a power conversion method thereof are provided. In the invention, by switching a detection switch disposed inside a control chip and connected to a detection pin of the control chip at a certain time, and performing a detection of an input voltage received by a boost power conversion circuit at the certain time through a collocation between a current detection auxiliary circuit and a current detection main circuit. Accordingly, an over current protection (OCP) point corresponding to whether an OCP mechanism is activated is compensated according to the detected result, and thus the detection manner of the OCP performed by the invention can be adaptively suitable for different input voltages. In the invention, according to the detected result, a brown out protection also can be performed, and the output of the boost power conversion circuit also can be changed or determined. | 12-12-2013 |
| 20130329473 | VOLTAGE RECTIFIER - A voltage rectifier rectifies an alternating current voltage to a direct current voltage. The voltage rectifier includes an input port for receiving the alternating current voltage; an output port for outputting the direct current voltage; a lightning protection unit; a rectifying unit; a filtering unit; a first fuse; and a second fuse. The input port, the lightning protection unit, the rectifying unit, the filtering unit, the output port are connected in series. The first fuse is connected between the input port and the lightning protection unit; the second fuse is connected between the lightning protection unit and the rectifying unit or the second fuse is connected between the rectifying unit and the filtering unit. | 12-12-2013 |
| 20130336028 | ELECTRIC-POWER CONVERSION SYSTEM - The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit ( | 12-19-2013 |
| 20130343103 | PROTECTION CONTROL SYSTEM FOR A MULTILEVEL POWER CONVERSION CIRCUIT - Aspects of the invention are directed to a protection control system of the invention is a protection control system for a multilevel power conversion circuit of a flying capacitor type, the power conversion circuit including six semiconductor switches of first through sixth semiconductor switches sequentially connected in series from a positive terminal to a negative terminal of a DC power supply, a first capacitor connected between the connection point of the second and third semiconductor switches and the connection point of the fourth and fifth semiconductor switches and a second capacitor connected between the connection point of the first and second semiconductor switches and the connection point of the fifth and sixth semiconductor switches, wherein the protection control system of the invention turns ON the second semiconductor switch or maintains the second semiconductor switch in an ON state, in the case of short-circuit fault of the third semiconductor switch. | 12-26-2013 |
| 20140043873 | Method In A Voltage Source Chain-Link Converter, Computer Programs And Computer Program Products - A method in a voltage source chain-link converter. The method includes: detecting a failure of a device of one converter cell module; blocking a phase-leg including the failed position; discharging to zero a capacitor unit of the converter cell module including the failed position; and providing a current path for the phase current through the converter cell module with the failed position, the current path including a first branch, in turn including corresponding positions of the first phase-leg and the second phase-leg in the full H-bridge arrangement, the first branch being connected in parallel to a second branch including the failed position, the second branch including the remaining two positions of the full H-bridge arrangement. The invention also encompasses corresponding computer program and computer program products. | 02-13-2014 |
| 20140078792 | POWER SUPPLY DEVICE CONTROL CIRCUIT - In some aspects of the invention, overcurrent protection is carried out by suppressing fluctuations in current flowing through a switching element after overcurrent detection. A peak current reaching time detection circuit detects a peak current reaching time needed until current flowing through a switching element reaches a peak value. A difference voltage detection circuit, including a 1/2 time detection circuit which detects a time of 1/2 an ON time of the preceding cycle of the switching element, detects difference voltage between reference voltage used when detecting overcurrent flowing to a load and a signal which has detected current flowing through the switching element for the 1/2 time. A delay time adjustment circuit, based on at least one of the peak current reaching time and difference voltage, carries out adjustment and control of a delay time occurring until the time when the switching element is turned off after detecting the overcurrent. | 03-20-2014 |
| 20140112036 | POWER SUPPLY WITH OUTPUT PROTECTION AND CONTROL METHOD OF THE POWER SUPPLY - The present invention relates to a power supply with output protection and a control method of the power supply. The invention mainly provides a pre-protection value lower than a default over-current protection value. When a present output current of the power supply is higher than or equal to the pre-protection value and is lower than the over-current protection value, the method firstly determines whether the power supply has abnormal conditions. When the power supply has abnormal conditions, the method can automatically provide or stop providing a working voltage to a load. When the present output current is further higher than or equal to the over-current protection value, the method takes an over-current protection action. By multi-level monitoring of the current values, the invention properly provides an over-current protection. | 04-24-2014 |
| 20140160813 | POWER SUPPLYING APPARATUS - There is provided a power supplying apparatus capable of determining whether to be normally operated by detecting whether a capacitor deteriorates with age based on a ripple voltage generated by switching of a primary side, the power supplying apparatus including a power supply unit switching input power to convert the input power into preset direct current (DC) power, a detecting unit setting a reference voltage based on the DC power of the power supply unit and comparing the reference voltage with a ripple voltage included in the DC power to detect a voltage level of the ripple voltage, and a controlling unit determining whether an abnormality has occurred according to a detection result of the detecting unit. | 06-12-2014 |
| 20140192571 | Wide Input Voltage Range Power Supply Circuit - An under voltage lockout circuit configured to set a minimum turn-on voltage for a load is provided. The circuit includes an input terminal configured to receive an input voltage. The circuit includes a first transistor configured to become conductive to supply the input voltage to the load when an input voltage to the under voltage lockout circuit exceeds a threshold, and a second transistor coupled to the first transistor, the second transistor configured to become conductive to supply the input voltage to a first resistor and not to the load when an input voltage to the under voltage lockout circuit falls below the threshold. | 07-10-2014 |
| 20140198543 | POWER SUPPLY WITH DC BREAKER SWITCH AND REDUCED REGULATED DC LINK VOLTAGE - Generally, this disclosure provides circuits and methods to reduce and regulate DC link voltage in a power supply through the use of a DC breaker circuit. The breaker circuit may include a breaker switch configured to couple an input stage circuit of a power supply to an output stage circuit of the power supply and to provide a regulated | 07-17-2014 |
| 20140204635 | AC-DC CONVERTER - An AC-DC converter includes two series circuits, an inductor, and a common snubber circuit. Each series circuit includes a switch and a current block device. The block device blocks a current from its high potential side to its low potential side when the first device is closed and allows the current from the low potential side to the high potential side when the first device is opened. The inductor is interposed between a first connection point between the switch and the block device of one series circuit and a second connection point between the switch and the block device of the other series circuit. The common snubber circuit is connected between each of the first connection point and the second connection point and at least one of both ends of the one series circuit. | 07-24-2014 |
| 20140233284 | OVER VOLTAGE PROTECTION FOR ELECTRIC MACHINES - A system and method for protecting an electrical power generation system from an over-voltage. The output voltage of a multi-phase rectifier, operatively connected between the output terminals of an electric machine and a load, is monitored. The input of the multi-phase rectifier is short-circuited upon detection that the output voltage has reached a threshold voltage. Removal of the short-circuiting of the input of the multi-phase rectifier is synchronized with a substantially zero-crossing of phase current flowing through switching devices in the rectifier once the output voltage is no longer above the threshold voltage. | 08-21-2014 |
| 20140241018 | SYSTEM AND METHOD FOR LIMITING OUTPUT CURRENT IN A SWITCHING POWER SUPPLY - A switching power supply comprises one or more power supply stages configured to receive power from an input power source and to generate an output voltage for powering a load by alternately opening and closing a set of switches. An output current sensor is configured to monitor a level of an output current of the switching power supply. The opening and closing of the set of switches is controlled so as to maintain the output voltage at a desired level when the level of the output current is below the threshold and so as to limit the output current when the level of the output current exceeds the threshold. | 08-28-2014 |
| 20140268941 | REACTIVE POWER BALANCING CURRENT LIMITED POWER SUPPLY FOR DRIVING FLOATING DC LOADS - A capacitance based reactive power balancing current limited power supply (RPBCLPS) for driving floating DC loads utilizes capacitive reactance to limit current being supplied to a load, rather than inductance. A capacitor transfers charge from an AC current input to a DC load. A fuse electrically protects the capacitor from high frequency current harmonics. A diode clamp electrically protects the capacitor from voltage spikes. A rectifier converts the AC current input into DC current for driving the DC load. The reactive power balancing current limited power supply can be incorporated as a key component into reactive power balancing electrical power distribution systems. Such systems can comprise a grid configuration structured to distribute the AC electrical power from a utility source to a plurality of DC loads. Further, the DC loads can be cooperatively located to provide functional distributed capacitance throughout a substantial portion of the grid. | 09-18-2014 |
| 20140268942 | INTERFACE ARRANGEMENT BETWEEN AC AND DC SYSTEMS FOR RELIABLE OPENING OF THE CIRCUIT BREAKER IN TIME - An interface arrangement for coupling between an AC system and a DC system. The arrangement includes a converter for conversion between AC and DC and having a DC side with a first and a second terminal for connection to the DC system and an AC side with a group of terminals for being coupled to the AC system, a transformer having a primary side with a first set of primary windings for being coupled to the AC system and a secondary side with a second set of secondary windings coupled to the converter, where the transformer is equipped with a third set of auxiliary windings and a short-circuiting device is connected between the third set of auxiliary windings and ground. | 09-18-2014 |
| 20140321176 | SYSTEMS AND METHODS FOR ELECTRONIC TRU INPUT PROTECTION - A system comprising a transformer rectifier unit (TRU) and a protection module operatively connected to an alternating current (AC) bus and configured to receive an AC power signal from the AC bus. The protection module is configured to monitor one or more parameters of the AC power signal and is configured to control a protection module output in response to the one or more parameters of the AC power signal. The protection module output is operatively connected to the TRU, which is configured to generate a direct current (DC) output signal. An associated method is also disclosed. | 10-30-2014 |
| 20140334201 | SNUBBER CIRCUIT TO INCREASE EFFICIENCY OF POWER CONVERTERS - A system including a converter and a snubber circuit. The converter converts an alternating current voltage into a direct current voltage and outputs the direct current voltage across an inductance and a switch connected in series. The inductance has a center tap connected to a node, which is connected to a load. In response to the switch being turned on, a first current flows through the inductance and the switch. In response to the switch being turned off, a second current flows from the node to the load. The snubber circuit is connected across the node and a junction of the inductance and the switch. In response to the switch being turned off, the snubber circuit receives a third current from the junction, and supplies a first portion of the third current to the node. The second current and the first portion of the third current flow through the load. | 11-13-2014 |
| 20150023074 | AC/DC ELECTRICAL CONVERSION DEVICE PERMITTING ENERGY RECOVERY AND MANAGEMENT OF DC-SIDE SHORT-CIRCUITS - An AC/DC electrical converter device having a source mode and a recovery mode, and for connection, on the AC side, to an AC voltage source and, on the DC side, to a DC power distribution network. It includes an AC/DC converter, a switching cell with two switches (K | 01-22-2015 |
| 20150043257 | INRUSH CURRENT SUPPRESSOR CIRCUIT - Disclosed is an inrush current suppressor circuit of a power supply circuit that supplies stand-by voltage from AC voltage. At a stand-by mode, only a diode and a resistor for suppressing inrush current are provided, and a capacitor provided in common between a stand-by power supply part and a start-up power supply part is charged, so that the inrush current is suppressed at both of sand-by and start-up modes and the number of devices of a circuit and power consumption are reduced. | 02-12-2015 |
| 20150070950 | AC-DC CONVERTER DEVICE COMPRISING AN OVERVOLTAGE PROTECTION CIRCUIT - An AC-DC converter device includes a first overvoltage protection circuit connected between a first DC output terminal and a first control terminal of a gate pulse controller. The first overvoltage protection circuit is configured to turn off a first switch if the output voltage between the DC output terminals is above a threshold voltage. A galvanic insulation barrier is connected either between the first overvoltage protection circuit and the first control terminal or between the first control terminal and the first switch. | 03-12-2015 |
| 20150138853 | UNDER-VOLTAGE PROTECTION CIRCUIT FOR PROGRAMMABLE POWER SUPPLIES - A control circuit of a power supply is provided. The power supply includes a current-sense circuit, a voltage-sense circuit, an output voltage regulation circuit, and a current regulation circuit. The current-sense circuit generates a current-sense signal in response to an output current of the power supply. The voltage-sense circuit generates a voltage-sense signal in response to an output voltage of the power supply. The output voltage regulation circuit is coupled to regulate the output voltage of the power supply according to a voltage reference signal and the voltage-sense signal. The output current regulation circuit is coupled to regulate the output current of the power supply according to a current reference signal and the current-sense signal. The output voltage of said power supply is programmable. | 05-21-2015 |
| 20150146459 | High-voltage protection circuit, high-voltage protection method and power supply - Disclosed are a high-voltage protection circuit, a high-voltage protection method and a power supply. The high voltage protection circuit comprises a main relay, an auxiliary relay, a first resistor, a second resistor, a first capacitor and a second capacitor, wherein one end of the main relay is connected to the input port of a live line, and the other end thereof is connected to the output port of the live line; one end of the auxiliary relay is connected to the input port of the live line, and the other end thereof is connected between the first resistor and the second resistor; one end of the first capacitor is connected to the output port of the live line, and the other end thereof is connected to a neutral line parallel to the live line; the second capacitor is connected to both ends of the main relay in parallel; and the second resistor and the first resistor are connected between the input port and the output port of the live line in series in sequence. The present invention can effectively solve the problem that quick recovery cannot be achieved in an energy-saving mode, so that the system achieves high efficiency and energy saving, and can ensure high-voltage protection in an energy-saving mode through the bridge connection of the second capacitor to both ends of the main relay, and the adjustment of the capacitance values of the first capacitor and the second capacitor. | 05-28-2015 |
| 20150318685 | Systems And Methods For Inductive Overvoltage Protection Of PFC Buk Capacitors In Power Supplies - Systems and methods are provided that may be implemented for overvoltage protection of bulk capacitors employed in power factor correction (PFC) circuitry components of switched mode power supply units (PSUs) using one or more inductive overvoltage feedback protection paths (OVPs) to monitor a voltage indicative of a PFC bulk capacitor by sensing the real time voltage at one or both of the primary and/or secondary side windings of a PSU transformer, and/or using an auxiliary windings of a PSU transformer. | 11-05-2015 |
| 20150357905 | A MULTILEVEL CONVERTER WITH HYBRID FULL-BRIDGE CELLS - A multilevel converter converting between AC and DC includes a phase arm with a number of cells between a DC pole and an AC terminal, the cells include at least one hybrid full bridge cell including a first cell connection terminal for coupling to the DC pole, a second cell connection terminal for coupling to the AC terminal, an energy storage element having a positive and a negative end, a first group of series connected semiconducting units in parallel with the energy storage element, where a junction between these forms one cell connection terminal, and a second group of series connected semiconducting units in parallel with the energy storage element and including a third semiconducting unit and a fourth semiconducting unit consisting of a number of unidirectional conducting elements including at least one unidirectional conducting element, where a junction between these forms a further cell connection terminal. | 12-10-2015 |
| 20150381029 | POWER CONVERSION DEVICE AND METHOD FOR TRANSMITTING PROTECTION SIGNAL USING THE SAME - A power conversion device includes a power semiconductor switch module, a driving signal-transmitting circuit, a plurality of failure-detecting circuits, a protection signal transmitting circuit and a control circuit. The driving signal transmitting circuit receives a control signal and generates a driving signal according to the control signal to drive the power semiconductor switch module. The failure detecting circuits generate a fault signal when they detect that one of the power semiconductor switches and/or the driving signal transmitting circuit is malfunctioning. The isolated pulse transforming unit of the protection signal transmitting circuit receives a corresponding fault pulse signal generated according to the fault signal, and outputs a protection pulse signal. The control circuit generates the control signal and receives a protection signal generated according to the protection pulse signal. The control circuit generates a turn off signal according to the protection signal to turn off the power semiconductor switch module. | 12-31-2015 |
| 20160036317 | POWER CONVERSION DEVICE - A power conversion device located between an AC power source and a load includes: a rectifier circuit unit that rectifies a voltage of the AC power source; a smoothing unit that smooths a DC voltage on the load side of the rectifier circuit unit; a short-circuiting unit that short-circuits the AC power source; a step-up reactor—located on the AC power source side of the short-circuiting unit; at least one of a reactor current detecting unit—that detects the current of the step-up reactor and a bus voltage detecting unit that detects an output voltage of the smoothing unit; a counterflow preventing element that prevents a counterflow of the current from the smoothing unit to the AC power source; a switching control unit that outputs a control signal for the short-circuiting unit; and a switching frequency changing unit that changes a frequency of the control signal using a logic operation. | 02-04-2016 |
| 20160036346 | ELECTRIC-POWER CONVERSION SYSTEM - The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit ( | 02-04-2016 |
| 20160036347 | ELECTRIC-POWER CONVERSION SYSTEM - The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit ( | 02-04-2016 |
| 20160036348 | ELECTRIC-POWER CONVERSION SYSTEM - The number of constituent components is reduced so as to provide a small-size and inexpensive electric-power conversion system. The electric-power conversion system is provided with an inverter circuit ( | 02-04-2016 |
| 20160043628 | POWER CONVERSION APPARATUS AND PROTECTION METHOD THEREOF WHILE FEEDBACK CURRENT SIGNAL BEING ABNORMAL - A power conversion apparatus and a protection method of the power conversion apparatus while a feedback current signal of the power conversion apparatus is abnormal are provided. The protection method includes a step of stopping switching a power switch if a duty cycle of a pulse width modulation signal is continuously greater than a preset duty cycle for at least one signal cycle and a voltage of a current sensing signal is smaller than a preset voltage level during the at least one signal cycle. | 02-11-2016 |
| 20160056710 | MECHANICAL BYPASS SWITCH DEVICE, CONVERTER ARM AND POWER CONVERTER - It is provided a mechanical bypass switch device arranged to bypass a converter cell in a power converter. The mechanical bypass switch device includes: a mechanical switch; a mechanical switch actuator arranged to make the mechanical switch conduct when supplied with an electric signal; a first control input; and a second control input. The mechanical bypass switch device is arranged such that a control signal, provided on either one of the first control input and the second control input or on both of the first control input and the second control input, causes the mechanical switch to conduct. A corresponding converter arm and bypass converter are also presented. | 02-25-2016 |
| 20160172963 | OVERVOLTAGE SNUBBER FOR GRID TIE INVERTER | 06-16-2016 |
| 20160172999 | SWITCHING CONTROLLER WITH OVER VOLTAGE PROTECTION AND SWITCHING CONVERTER AND METHOD THEREOF | 06-16-2016 |
| 363054000 | Thyristor | 6 |
| 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 |
| 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 |
| 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 |
| 20130314956 | BASIC FUNCTION UNIT OF VOLTAGE-SOURCE CONVERTER BASED ON FULL-CONTROLLED DEVICES - The present invention relates to a basic function unit of voltage source converter, which is characterized in that the basic function unit includes a switching device function module, a by-pass function module, a switch protection function module, a secondary control and protection function module, and a energy storage unit. The secondary control and protection function module, the energy storage unit and the by-pass function module are all fixed on the motherboard, there is a slide rail at the bottom of the motherboard, the motherboard can move back and forth on the slide rail. The voltage source converter based on that unit is highly modular, insensitive to switch device parameters, lower output voltage change rate, and smaller dv/dt stress of equipment, smaller noise, without filter, convenient installation and maintenance. | 11-28-2013 |
