Including Automatic Or Integral Protection Means Patents (Class 363/50)
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Publication number: 20150138852Abstract: An exemplary method for operating a converter to supply electrical power to a load includes controlling the converter for a provided overload time so that overload power is applied to the load, and controlling the converter for a provided resting time, so that resting power is applied to the load. The overload power is higher than a nominal power which corresponds to a steady-state operation limit of the converter, wherein the resting power is lower than the nominal power.Type: ApplicationFiled: January 29, 2015Publication date: May 21, 2015Applicant: ABB Technology AGInventors: Daniel SIEMASZKO, John Eckerle, Ata Douzdouzani, Klaus Ruetten
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Patent number: 9035583Abstract: The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic control unit arranged to control the driving circuit in such a way as to cause the flow in the motor of a variable average current capable of producing a required speed of rotation, in accordance with a predetermined relationship or function. The control unit is designed to store a predetermined threshold of rotation speed, and to control the motor through the associated driving circuit in such a way that when the rotational speed of the motor exceeds the threshold the driving circuit causes electrical braking of the motor.Type: GrantFiled: December 13, 2011Date of Patent: May 19, 2015Assignee: GATE S.R.L.Inventors: Davide Cerrato, Pierfranco Pangella
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Patent number: 9036382Abstract: Methods and apparatus are presented for detecting phase loss and/or excessive ripple in a power converter, in which bandpass filters are used to obtain harmonic voltage amplitudes associated with the power converter DC bus, and phase loss is detected if a ratio of the second harmonic to the sixth harmonic and/or a ratio of the fourth harmonic to the sixth harmonic exceed predetermined threshold values.Type: GrantFiled: March 6, 2013Date of Patent: May 19, 2015Assignee: Rockwell Automation Technologies, Inc.Inventors: Bing Li, David Leggate, Timothy Rowan
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Publication number: 20150124499Abstract: An active damper and a power supply according to exemplary embodiments include: a damper resistor coupled to an input voltage; a damper switch coupled in parallel with the damper resistor; and a capacitor to which a reset current generated by a leading edge of the input voltage flows. The damper switch is turned off by the reset current.Type: ApplicationFiled: October 29, 2014Publication date: May 7, 2015Inventors: Hyun-Chul EUM, Young-Jong KIM
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Publication number: 20150109835Abstract: In one embodiment, an output overvoltage protection method for a switching power supply, can include: (i) charging a first capacitor by a first current during a first time interval of a switching period of the switching power supply; (ii) charging a second capacitor by a second current during a second time interval of the switching period of the switching power supply; and (iii) generating an overvoltage protection signal by comparing a first voltage across the first capacitor against a second voltage across the second capacitor at the end of the second time interval, where the overvoltage protection signal is active when the first voltage is at least as high as the second voltage.Type: ApplicationFiled: October 8, 2014Publication date: April 23, 2015Inventor: Xiaoru Xu
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Patent number: 8976554Abstract: A cascaded multi-level inverter is controlled in fault bypass operation. Rather than relying on approximations or feedback forms, the reference voltages are generated as an analytic solution. The analytic solution and its implementation are not affected by the output frequency of the inverter and it is able to provide maximum possible balanced line-line voltage to a three-phase motor. In addition, the analytic solution provides exact limits for the allowable operation region of the motor power factor in order to prevent overvoltage conditions of the cell inverter.Type: GrantFiled: September 18, 2012Date of Patent: March 10, 2015Assignee: Siemens CorporationInventor: Liviu Mihalache
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Patent number: 8964428Abstract: A power conversion device according to embodiments includes a plurality of switch groups, a plurality of inductors, and a snubber circuit. The switch groups are respectively provided for input phases and each of the switch groups has a plurality of one-way switches that connects the corresponding input phase and output phases. The plurality of inductors are respectively connected between the input phases and the switch groups, and are coupled to one another so that current flowing through the one-way switch of one switch group moves to and continues to flow through the turned-on one-way switch of the other switch group when the one-way switch of the one switch group is turned off. The snubber circuit clamps a voltage based on the maximum voltage occurring on the plurality of inductors to a predetermined value.Type: GrantFiled: December 19, 2012Date of Patent: February 24, 2015Assignee: Kabushiki Kaisha Yaskawa DenkiInventor: Katsutoshi Yamanaka
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Publication number: 20150049526Abstract: A converter receives input of an AC voltage, converts the AC voltage into a DC voltage, and applies the DC voltage between a first power line on a positive electrode side and a second power line on a negative electrode side. A snubber circuit has a capacitor provided between the first and the second power lines, and a diode connected in series with the capacitor between the first and the second power lines, and including an anode on a side close to the first power line on the positive electrode side in a series path with the capacitor. An inverter converts the DC voltage into an AC voltage, and applies the AC voltage to an inductive load. An inverter-side current detection unit detects a current that flows through the first power line on the positive electrode side or the second power line on the negative electrode side between the inverter and the snubber circuit.Type: ApplicationFiled: January 23, 2013Publication date: February 19, 2015Inventors: Sumio Kagimura, Toshiaki Satou, Shinichi Ishizeki
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Publication number: 20150016157Abstract: The constant switching frequency discontinuous current mode average output current control scheme is composed of a reference block, reference calculation block, state detecting block, error detector block, zero state detector, power driver block and internal clock.Type: ApplicationFiled: July 9, 2013Publication date: January 15, 2015Inventors: Qi Cui Wei, Da Feng Weng
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Publication number: 20150009729Abstract: A circuit includes a switching module, a control module, and a driving module. The driving module is electrically coupled between the control module and the switching module for generating a driving signal. The driving module includes a normal driving unit and a fault protection unit. The normal driving unit is for turning on and off the switching module according to a first command signal from the control module. The fault protection unit is for lowering the driving signal from a driving value to a protection value according to a second command signal from the control module during a fault protection period after the control module receives a fault signal.Type: ApplicationFiled: July 3, 2014Publication date: January 8, 2015Inventors: Tao WU, Ying ZHANG, Laigui QIN, Yingqi ZHANG, Fan ZHANG, Xin HAO
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Publication number: 20150003127Abstract: A multilevel power conversion circuit using a flying capacitor(s) can include two bidirectional switches connected in series between a middle potential terminal of DC power supplies and a conversion circuit using semiconductor switches. Gate driving circuits for the bidirectional switches are provided with a short-circuit fault detecting circuit for detecting short-circuit of the semiconductor switching device composing the bidirectional switch circuit in an OFF signal period. Upon detection of a short-circuit fault, all semiconductor switching devices are interrupted to stop the whole system.Type: ApplicationFiled: June 11, 2014Publication date: January 1, 2015Inventor: Satoki TAKIZAWA
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Publication number: 20150003126Abstract: There is provided a power supply device having a primary side on which a primary winding of a transformer is located and a secondary side on which a secondary winding of the transformer is located, and supplying power to a load, the device including: a photo coupler transmitting load short-circuit information from the secondary side to the primary side, a standby power supply terminal supplying power to the photo coupler; and a current passing unit connecting the photo coupler to the load.Type: ApplicationFiled: September 20, 2013Publication date: January 1, 2015Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.Inventors: Don Sik KIM, Dong Jin LEE, Jae Cheol JU, Jae Hak LEE, Hong Sun PARK
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Publication number: 20140369094Abstract: It is presented a converter cell comprising: a first terminal and a second terminal; an energy storage device connected on a first end to the second terminal; a first switch connected on a first end to the first terminal; a second switch arranged between the two terminals; and a third switch connected between a second end of the first switch and a second end of the energy storage device. A corresponding converter arm and method are also presented.Type: ApplicationFiled: November 11, 2011Publication date: December 18, 2014Applicant: ABB Technology AGInventor: Falah Hosini
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Publication number: 20140369093Abstract: Exemplary embodiments provide a method and an adaptive RCD snubber circuit for a switching converter having a series-connection of a main inductor and a main switching device. A voltage stress of the main switching device is sensed, and the sensed voltage stress is controlled to a reference level by controlling a snubber capacitor voltage, wherein the snubber capacitor voltage is controlled by adjusting the snubber resistance of the RCD snubber.Type: ApplicationFiled: June 17, 2014Publication date: December 18, 2014Applicant: ABB RESEARCH LTD,Inventors: Ki-Bum PARK, Francisco CANALES, Sami PETTERSSON
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Publication number: 20140362621Abstract: Systems and methods are provided for protecting a power conversion system. A system controller includes a two-level protection component and a driving component. The two-level protection component is configured to detect an output power of a power conversion system and generate a protection signal based on at least information associated with the output power. The driving component is configured to generate a drive signal based on at least information associated with the protection signal and output the drive signal to a switch associated with a primary current flowing through a primary winding of the power conversion system. The driving component is further configured to generate the drive signal corresponding to a first switching frequency to generate the output power equal to a first power threshold and generate the drive signal corresponding to a second switching frequency to generate the output power equal to a second power threshold.Type: ApplicationFiled: July 22, 2013Publication date: December 11, 2014Applicant: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Xiaomin Huang, Huawei Lv, Chao Yao, Qiang Luo, Lieyi Fang
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Patent number: 8908398Abstract: A method for operating a converter circuit is provided. The converter circuit includes a converter unit and a transformer. The transformer includes at least one winding set with a primary winding and a secondary winding. The converter unit is connected, on the AC voltage side, to the primary winding of the respective winding set. In order to compensate for undesirable saturation of the transformer, the converter unit is used to deliberately apply a DC voltage to the primary winding of the respective winding set of the transformer.Type: GrantFiled: December 2, 2011Date of Patent: December 9, 2014Assignee: ABB Technology AGInventors: Beat Buchmann, Beat Ronner
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Patent number: 8885377Abstract: A matrix converter according to an embodiment includes a control unit generates a highest phase-to-phase voltage among load side phase-to-phase voltages by controlling bidirectional switches that connect phases with respect to the highest phase-to-phase voltage and phases with respect to a highest phase-to-phase voltage among AC-source side phase-to-phase voltages. Moreover, the control unit generates a middle phase-to-phase voltage among the load side phase-to-phase voltages by controlling bidirectional switches that connect phases with respect to the middle phase-to-phase voltage and phases with respect to a middle phase-to-phase voltage among the AC-source side phase-to-phase voltages.Type: GrantFiled: April 12, 2012Date of Patent: November 11, 2014Assignee: Kabushiki Kaisha Yaskawa DenkiInventor: Eiji Yamamoto
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Patent number: 8878476Abstract: A PCU drives a motor generator using electric power from a power storage device. The PCU includes a power conversion device, a capacitor and a control unit. When detecting a crash, the control unit drives the power conversion device and discharges charges remaining in the capacitor. Each of a plurality of reverse conducting-type semiconductor elements included in the power conversion device is integrally formed of a first semiconductor element operating as a switching element and a second semiconductor element operating as a free wheeling diode. In response to detection of the crash of a vehicle, the control unit changes a voltage applied to a gate terminal of the first semiconductor element and increases an electric power loss during a current-circulating operation by the second semiconductor element. As a result, the remaining charges stored in the capacitor in the drive apparatus is discharged as soon as possible.Type: GrantFiled: July 13, 2012Date of Patent: November 4, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Satoshi Hirose
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Patent number: 8873256Abstract: A method and apparatus of operating a controller usable for operating a wind turbine is provided. The wind turbine includes a voltage converter being connectable to a power grid via a filter arrangement. The method includes determining a line voltage and adding the determined line voltage to the output of the voltage converter with a time delay. The time delay is adjusted such that resonant effects occurring at the filter arrangement are decreased.Type: GrantFiled: June 23, 2011Date of Patent: October 28, 2014Assignee: Vestas Wind Systems A/SInventor: Eng Kian Kenneth Sng
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Publication number: 20140313797Abstract: In the field of voltage source converters which provide high voltage direct current (HVDC) power transmission and reactive power compensation there is a need for an improved power electronic module which exhibits high efficiency, provides a safe failure mode, and is tolerant of faults. A power electronic module (30; 70), for use in a chain-link converter of a voltage source converter providing high voltage direct current power transmission and reactive power compensation, comprises a first set (32) of series-connected switching elements connected in parallel with an energy storage device (34). The first set (32) of series-connected switching elements includes a first latching switching element (38) and a first non-latching switching element (40).Type: ApplicationFiled: November 15, 2011Publication date: October 23, 2014Applicant: ALSTOM TECHNOLOGY LTD.Inventors: Colin Charnock Davidson, David Reginald Trainer
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Publication number: 20140313796Abstract: A converter valve unit including a plurality of parallel connected controllable semiconducting elements. A free-wheeling diode is connected in anti-parallel with each semiconducting element. A control unit is configured to control each semiconducting element. A current sensor is connected to each of the parallel connected semiconducting elements. The current sensor is configured to sense a current of each semiconducting element by measuring a voltage over the current sensor. A differentiator is configured to compare the currents of the semiconducting elements by comparing the voltages. Upon detecting an unbalance in the currents the differentiator sends a turn-on signal to all control units to control all the semiconducting elements of the valve unit into a conducting stage.Type: ApplicationFiled: April 21, 2014Publication date: October 23, 2014Applicant: ABB RESEARCH LTD.Inventor: Hans Peter NEE
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Publication number: 20140293666Abstract: The disclosure relates to a circuit arrangement for suppressing an arc occurring during a switching process, wherein a current bypass path comprises a PTC resistor connected in series with a fuse. The current bypass path is provided in parallel with a switch. The disclosure also relates to a photovoltaic power plant with a photovoltaic generator which is connected to an inverter via DC lines. In this arrangement, such a circuit arrangement is arranged in at least one of the DC lines.Type: ApplicationFiled: June 12, 2014Publication date: October 2, 2014Inventors: Christopher Merz, Markus Hopf
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Patent number: 8848407Abstract: 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.Type: GrantFiled: October 18, 2013Date of Patent: September 30, 2014Assignee: ABB Technology AGInventor: Anders Blomberg
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Publication number: 20140268940Abstract: Exemplary embodiments are directed to a method for controlling a switching branch of a three-level converter to enter a stop state. The switching branch including a first semiconductor switch and a second semiconductor switch, a first diode and a second diode, a third semiconductor switch and a fourth semiconductor switch, a third diode, and a fourth diode, a fifth semiconductor switch and a sixth semiconductor switch, a fifth diode, and a sixth diode, and a manner of controlling the semiconductor switches. When the switching branch is set to enter a stop state, current flowing in a main circuit of the switching branch is transferred in a controlled manner to diodes that conduct the current, when all the semiconductor switches of the main circuit of the converter are turned OFF.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicant: ABB OyInventors: Tero VIITANEN, Mikko SAARINEN
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Publication number: 20140268939Abstract: A fault tolerant power supply system includes at least one load switch configured to connect an input voltage to an output node of the load switch when the load switch is turned on and at least one power channel coupled to the load switch to receive the input voltage. The power channel is configured as a buck converter and includes at least a high-side power switch and a low-side power switch. The fault tolerant power supply system is configured to measure a current flowing through the low-side power switch, to determine that the current flowing through the low-side power switch has exceeded a current limit threshold, and to disable the low-side power switch and the load switch in response to the determination that the current flowing in the low-side power switch has exceeded the current limit threshold.Type: ApplicationFiled: July 24, 2013Publication date: September 18, 2014Applicant: Alpha and Omega Semiconductor IncorporatedInventors: Mark Tomas, Zhiye Zhang, Allen Chang, Kuang Ming Chang, Gilbert Lee
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Publication number: 20140268938Abstract: A power converter controller includes an input sense circuit to receive an input sense signal representative of an input of a power converter. A zero-crossing detector is coupled to the input sense circuit to be responsive to the input sense signal falling below a first zero-crossing threshold and rising above a second zero-crossing threshold to determine zero-crossing intervals. A timer circuit is coupled to the zero-crossing detector to determine peak intervals and to synchronize an enable signal generated to enable the input sense circuit to sense the input of the power converter during the peak intervals of the input of the power converter. A comparator circuit is coupled to the input sense circuit and the timer circuit to detect if the input of the power converter is greater or less than one or more thresholds during the peak intervals of the input of the power converter.Type: ApplicationFiled: March 13, 2013Publication date: September 18, 2014Inventors: David Michael Hugh Matthews, Balu Balakrishnan, Zhao-Jun Wang
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Patent number: 8830707Abstract: This current converter is formed to short-circuit input-side terminals of a plurality of power conversion portions, to parallelly connect output-side terminals of the plurality of power conversion portions with each other and to couple inductors provided on the plurality of power conversion portions respectively with each other, to be capable of performing an operation of moving currents between windings of the coupled inductors on the basis of ON-/OFF-states of pluralities of one-way switches.Type: GrantFiled: February 9, 2012Date of Patent: September 9, 2014Assignee: Kabushiki Kaisha Yaskawa DenkiInventor: Katsutoshi Yamanaka
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Patent number: 8824176Abstract: The resonant converting circuit comprises a resonant circuit, a current detecting circuit and the resonant controller. The resonant controller controls a power conversion of the resonant circuit for converting an input voltage into an output voltage and the resonant controller comprises an over current judgment unit and an over current protection unit. The over current judgment unit determines whether the resonant current is higher than an over current value according to a current detecting signal generated by the current detecting circuit. The over current protection unit generates a protection signal in response to a determined result of the over current judgment unit and an indication signal indicative of an operating state of the resonant controller. The resonant controller executes a corresponding protecting process in response to the protection signal.Type: GrantFiled: March 6, 2012Date of Patent: September 2, 2014Assignee: Green Solution Technology Co., Ltd.Inventors: Ke Peng, Li-Min Lee, Chung-Che Yu, Shian-Sung Shiu
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Publication number: 20140241017Abstract: An input circuit connected to a semiconductor circuit is configured to receive a voltage indicating an on/off operation state of a power supply and to output a voltage that is lower than a breakdown voltage of the semiconductor circuit. The input circuit includes a first nMOS transistor and a resistor element. The first nMOS transistor has a drain receiving an outside voltage, a gate receiving a bias voltage higher than a power supply voltage inputted to a semiconductor circuit, and a source connected to the semiconductor circuit. The first nMOS transistor has a breakdown voltage higher than the power supply voltage inputted to the semiconductor circuit. One end of the resistor element connects with the source of the first nMOS transistor, while the other end connects with a reference potential of the semiconductor circuit.Type: ApplicationFiled: July 9, 2013Publication date: August 28, 2014Inventor: Kei Kasai
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Patent number: 8804383Abstract: A starter of the grid-connected inverter and a control method thereof are disclosed. The starter comprises a controller, and a first switch and a first resistor connected in parallel. The controller includes an input end, and first and second output ends. The input end inspects the DC voltage signal from the inverter. When the DC voltage exceeds a predetermined voltage threshold, the first output end sends a first control signal to turn on the first switch, and the second output end sends a second control signal to make the grid-connected inverter enter into a chopping mode. There is a delay period between the send time of the first control signal and that of the second control signal.Type: GrantFiled: July 9, 2012Date of Patent: August 12, 2014Assignee: Delta Electronics, Inc.Inventors: Wen-Tao Zhan, Liang Li, Hong-Yang Wu, Heng Huang, Bin Wang
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Publication number: 20140192570Abstract: According to an embodiment, a power generation system is provided comprising a power generator; a plurality of converter modules, each converter module having a DC link, wherein the DC link of each converter module is connected to the DC links of the other converter modules of the plurality of converter modules via a fuse associated with the converter module; and a controller configured to, if it is detected that there is a fault in one of the converter modules, disconnect the converter module in which there is a fault from the power generator and connect two or more other converters module of the plurality of converter modules to the power generator and to control the power generation system to supply power to the DC links of the two or more other converter modules such that power is supplied to the converter module in which there is a fault via the fuse associated with the converter module such that the fuse associated with the converter module melts.Type: ApplicationFiled: July 11, 2012Publication date: July 10, 2014Applicant: VESTAS WIND SYSTEMS A/SInventors: John Godsk Nielsen, Ove Styhm
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Publication number: 20140192569Abstract: Apparatus and methods for generating an overvoltage signal from a bias winding signal of a power converter transformer are disclosed. In one example, an overvoltage protection circuit may include a current augmentation circuit and a detection circuit. The current augmentation circuit may be coupled to receive the bias winding signal, which may be representative of the power converter output. The current augmentation circuit may include a threshold circuit and a filter circuit that may generate a filtered level shifted signal from the bias winding signal. The current augmentation circuit may generate an augmented signal from the filtered level shifted signal. The detection circuit may be coupled to receive the augmented signal and to generate an overvoltage signal by comparing the augmented signal with a reference voltage. When high asserted, the overvoltage signal may indicate a potential overvoltage condition at the output of the power converter.Type: ApplicationFiled: January 8, 2013Publication date: July 10, 2014Inventor: Marvin Cruz ESPINO
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Publication number: 20140177297Abstract: A power supply circuit preventing any overvoltage to an electronic element includes a voltage conversion unit and a voltage clamping unit. The voltage conversion unit converts voltage of a power supply into an operation voltage of the electronic element, and outputs the converted voltage through an output terminal of the voltage conversion unit. When the voltage output from the output terminal of the voltage conversion unit is more than the operation voltage of the electronic element, the voltage clamping unit effectively clamps the voltage output from the output terminal of the voltage conversion unit down to the operation voltage of the electronic element.Type: ApplicationFiled: December 26, 2013Publication date: June 26, 2014Applicants: HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTDInventor: HAI-QING ZHOU
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Patent number: 8760889Abstract: An over-current detecting apparatus for a switching element includes a reference power source, a comparator circuit, a current converting element, a first resistor, and a second resistor. The comparator circuit includes a first input terminal that receives a voltage corresponding to a current flowing in the switching element and a second input terminal that receives a reference voltage supplied from the reference power source. The current converting element converts a voltage of a temperature detecting element (4) that detects a temperature of the switching element into a current corresponding to the voltage of the temperature detecting element. The first resistor is connected in series to a reference power supply side of the second input terminal of the comparator circuit. The second resistor is connected in series to a ground side of the second input terminal of the comparator circuit.Type: GrantFiled: December 11, 2009Date of Patent: June 24, 2014Assignee: Nissan Motor Co., Ltd.Inventor: Sho Maruyama
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Patent number: 8755206Abstract: A converter valve unit including a plurality of parallel connected semiconducting elements, a free-wheeling diode and a control unit.Type: GrantFiled: March 31, 2005Date of Patent: June 17, 2014Assignee: ABB Research Ltd.Inventor: Hans Peter Nee
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Publication number: 20140159641Abstract: Embodiments for a battery charger include a single conversion switched mode power supply having a bias winding on the primary side of the power transformer. The bias winding produces an output that is proportional to the voltage produced on the secondary winding, and is sensed by a programmable voltage sensing circuit. The programmable voltage sensing circuit is programmed by a voltage select signal from the secondary side of the charger to produce an sense signal that is proportional to the output of the bias winding by a selected factor corresponding to a battery type of a battery being charged.Type: ApplicationFiled: December 7, 2012Publication date: June 12, 2014Applicant: MOTOROLA SOLUTIONS, INC.Inventor: MICHAEL D. GEREN
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Publication number: 20140133200Abstract: A clamp snubber circuit for reducing a value of a peak voltage on a power switch of a power converter includes: a clamp switch; a clamp capacitor having a first terminal electrically coupled to the power switch via the clamp switch, and a second terminal electrically coupled to a ground; and at least one resistance adjustment circuit, each of which includes: a switch element having a first terminal electrically coupled to the first terminal of the clamp capacitor, a second terminal electrically coupled to the ground, and a control terminal; and a control circuit configured to receive a detection parameter of the power converter and compare the detection parameter with a preset parameter and output a control signal to the control terminal of the switch element to adjust a resistance value of the resistance adjustment circuit. Peak voltages applied on power switches may be clamped and absorbed more effectively.Type: ApplicationFiled: March 15, 2013Publication date: May 15, 2014Applicant: DELTA ELECTRONICS, INC.Inventors: Liping Sun, Chao Yan, Yiqing Ye
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Publication number: 20140119071Abstract: An overload protection saving circuit provided by the present invention has an input power circuit, an output power circuit, a control circuit, an overload timing circuit, and a saving circuit. The output power circuit couples to the input power circuit. The control circuit receives a feedback signal of the output power circuit in order to control the input power circuit. The overload timing circuit receives the feedback signal of the output power circuit in order to transmit an overload signal to the control circuit while the time of an overload is over a predetermining time. The saving circuit receives the feedback signal of the output power circuit in order to transmit a saving signal to the overload timing circuit while in a lightload or a noload, so that the overload timing circuit is disabled.Type: ApplicationFiled: June 25, 2013Publication date: May 1, 2014Inventor: Liang-Shu Xu
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Publication number: 20140112035Abstract: A power supply apparatus includes an inductor to store and discharge energy and a circuit to charge the inductor using a plurality of charging pulses. The circuit skips a charging pulse of the plurality of charging pulses to reduce overcurrent associated with the inductor.Type: ApplicationFiled: October 21, 2013Publication date: April 24, 2014Applicant: Marvell World Trade Ltd.Inventors: Biing Long SHU, Jinho CHOI, Jye Sheng HONG, Ravishanker KRISHNAMOORTHY
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Publication number: 20140092652Abstract: A power supply device includes: a first switching element and a flywheel semiconductor element which are connected in series to a first DC power source in this order; and a reactor and a second DC power source which are connected in series in this order to a node between the first switching element and the flywheel semiconductor element. A second switching element and a charge circuit for charging a line between the first switching element and the second switching element are interposed between the reactor and the second DC power source. Abnormality of each element is determined from a voltage of each portion of the power supply device measured when the first and second switching elements and the flywheel semiconductor element are driven and controlled.Type: ApplicationFiled: March 29, 2013Publication date: April 3, 2014Inventors: Nobuhiro KIHARA, Hiroshi OKUDA
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Publication number: 20140084835Abstract: A load driving device according to the present invention has: an internal circuit (DRV) that operates in response to the supply of a power supply voltage (HV or LV); an output circuit (PD1 and PD2) for driving a load in response to the supply of the power supply voltage (HV or LV); an abnormality detection circuit (12) for monitoring the power supply voltage (HV or LV) and generating an abnormality detection signal (S1); and a power supply switch (P0) for, according to the abnormality detection signal (S1), conducting or cutting off a power-supply-voltage supply line to the internal circuit (DRV).Type: ApplicationFiled: May 25, 2012Publication date: March 27, 2014Applicant: Rohm Co., Ltd.Inventors: Issei Kadowaki, Norihiro Maeda
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Patent number: 8680884Abstract: A circuit for detecting fault conditions in a supply circuit includes a monitoring circuit and a comparator circuit. The monitoring circuit is operable to output a detection signal related to a control signal for the switched mode power supply. The control signal may be configured to operate at least one switch of the supply circuit between alternating activated and deactivated states to supply power to a load. The comparator circuit is operable to compare the detection signal to a range defined by first and second thresholds and output a fault signal according to a relationship of the detection signal to the range over a time period. Related methods of operation are also discussed.Type: GrantFiled: April 8, 2010Date of Patent: March 25, 2014Assignee: Cree, Inc.Inventor: Joseph Paul Chobot
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Publication number: 20140071720Abstract: A voltage converter includes: an input terminal receiving an input voltage; an output terminal providing an output voltage; a switching circuit having a main switch configured to regulate the output voltage, wherein a control end of the main switch is configured to receive a Pulse Width Modulation (PWM) signal, and the output voltage is controlled according to the duty cycle of the PWM signal; and a protection switch coupled between the input terminal and the switching circuit, and wherein when the output voltage is higher than a reference voltage, the protection switch is turned OFF.Type: ApplicationFiled: September 11, 2013Publication date: March 13, 2014Applicant: Chengdu Monolithic Power Systems Co., Ltd.Inventors: Qian Ouyang, Eric Yang, Jinghai Zhou, Jijian Sun
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Publication number: 20140063876Abstract: Systems and methods in accordance with this invention provide a power converter including an input signal terminal, a first output signal at a first output signal terminal, and a controller. The controller is adapted to switch the first output signal from a first value to a second value, measure a voltage at the input signal terminal as a function of time, set a flag to a first flag value if the measured voltage falls below a predetermined value within a first predetermined time interval after the first output signal has been switched from the first value to the second value, otherwise set the flag to a second flag value, and save the flag in a memory. Numerous other aspects are also provided.Type: ApplicationFiled: September 6, 2012Publication date: March 6, 2014Applicant: SIEMENS INDUSTRY, INC.Inventors: James Buckey, Ralph Flaugher, Shelby Chun, Naren Nagarur
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Publication number: 20140049995Abstract: A system and method for performing diagnostics in a medium voltage drive. The system includes a power cell and a bypass mechanism. The bypass mechanism is operably connected to output terminals of the power cell and configured to create a shunt path between the output terminals. The bypass mechanism includes a communication interface configured to transmit a bypass signal to a communication interface associated with the power cell in response to a state change. The method of performing diagnostics includes a controller transmitting an input voltage to a bypass mechanism of the power supply, thereby causing a state change of the bypass mechanism. The controller receives a signal from the power cell, wherein the signal indicates the power cell has detected the state change of the bypass mechanism. The controller then determines if the power cell is correctly associated with the bypass mechanism.Type: ApplicationFiled: August 20, 2012Publication date: February 20, 2014Applicant: Siemens Industry, Inc.Inventor: John Channing Bousfield, III
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Patent number: 8638050Abstract: In one embodiment, a DC power supply unit includes a DC power supply source; a load circuit connected to an output end of the DC power supply source; a load state detection device to detect a load voltage or an electric quantity corresponding to the load voltage; and a control device to receive the detected output of the load state detection device. The control device controls a maximum output voltage of the DC power supply source so that the voltage difference between the maximum output voltage of the DC power supply source and the load voltage at the time of normal operation falls within a predetermined range in which arc discharge is suppressed.Type: GrantFiled: May 12, 2011Date of Patent: January 28, 2014Assignee: Toshiba Lighting and Technology CorporationInventors: Go Kato, Hiroshi Kubota, Masahiko Kamata, Hiroshi Terasaka, Tomokazu Usami, Naoko Iwai
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Patent number: 8638576Abstract: A voltage source converter having a plurality of cell modules connected in series, each cell module including a converter unit having an ac-side and a dc-side, and the voltage source converter includes a control unit adapted to control the converter units, where at least one of the cell modules includes a second redundant converter unit having an ac-side which is connected in parallel with the ac-side of the first converter unit and the control unit is configured to substantially synchronously control the first and the second converter units.Type: GrantFiled: September 24, 2012Date of Patent: January 28, 2014Assignee: ABB Technology AGInventors: Falah Hosini, Mauro Monge
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Publication number: 20140009983Abstract: Aspects of the invention include a power conversion device control device, including multiple drive circuits having an alarm signal formation circuit that sets a pulse signal having as one cycle a period. The one cycle period includes a determination period, of which a different period is set for each of plural protection circuits that detect information for carrying out a protection operation of semiconductor elements configuring a power conversion device, and a constant period, in which a condition varies with respect to the determination period, takes a protection circuit for which it is first detected that a protection operation is necessary to be a first-come first-served protection circuit, and outputs the pulse signal corresponding to the first-come first-served protection circuit as an alarm signal, wherein the alarm signal formation circuit is such that a resetting condition of the alarm signal is a condition that a protection operation stopped condition.Type: ApplicationFiled: September 9, 2013Publication date: January 9, 2014Applicant: FUJI ELECTRIC CO., LTD.Inventor: Akira NAKAMORI
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Patent number: 8619449Abstract: There is provided a voltage converter capable of reliably preventing malfunctions of an electronic circuit to stably maintain an accurate operation by suppressing high-frequency noise generated on an input side. A DC-DC converter 1 as a voltage converter includes an active component embedded substrate 2 having an IC chip 7 and an input-side capacitor Cin and an output-side capacitor Cout mounted thereon, and ground layers 33G-1 and 33G-2 and a ground layer 32G are formed therein so as to interpose the IC chip 7 therebetween. The input-side capacitor Cin is connected to the ground layer 33G-1, and the output-side capacitor Cout is connected to the ground layer 33G-2. Moreover, the ground layer 32G is connected to the terminals of the IC chip 7, and the input-side capacitor Cin and the output-side capacitor Cout are connected to each other by the ground layers 33G-1 and 33G-2.Type: GrantFiled: March 18, 2011Date of Patent: December 31, 2013Assignee: TDK CorporationInventor: Hironori Chiba
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Patent number: 8611118Abstract: A high side isolated gate drive controller circuit is presented with an on-time limiting circuit to prevent isolation transformer saturation as well as a universal power up circuit adaptable to power the driver with constant voltage for different input voltage levels.Type: GrantFiled: September 29, 2010Date of Patent: December 17, 2013Assignee: General Electric CompanyInventors: Gang Yao, Bo Zhang, Ting Zhang