With Automatic Control Of The Magnitude Of Output Voltage Or Current Patents (Class 363/25)
  • Patent number: 10381940
    Abstract: A rectifier IC seals, in a single package, a first transistor chip which integrates a first transistor, a second transistor chip which integrates a second transistor and a controller chip which detects a first node voltage and a second node voltage of each of the transistors so as to perform on/off control on the transistors, and the rectifier IC functions as a secondary-side rectification means of an isolated switching power supply.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: August 13, 2019
    Assignee: Rohm Co., Ltd.
    Inventor: Hiroki Kikuchi
  • Patent number: 10361639
    Abstract: A main unit 2 and a subsidiary unit 4 include two inverters 6m, 8m and 6s, 8s, and PWM control circuits 26m, 26s, respectively. A changeover switch 20 operates to simultaneously connect the inputs of the two inverters of the main unit 2 and the inputs of the two inverters of the subsidiary unit 4 in series or in parallel. An imbalance detecting circuit 28 detects imbalance in the input voltages to the two inverters of the main unit 2, and provides the detection result to the PWM control circuits 26m and 26s. The PWM control circuit 26m controls the inverters 6m and 8m of the main unit 2 in accordance with the detection result supplied from the imbalance detecting circuit 26m, and the PWM control circuit 26s controls the subsidiary unit 4 in accordance with the detection result supplied from the imbalance detecting circuit 26m. The input current to the main unit 2 is larger than the input current to the subsidiary unit 4.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: July 23, 2019
    Assignee: Sansha Electric Manufacturing Co., Ltd.
    Inventors: Hiroshi Saso, Takeshi Morimoto
  • Patent number: 10312737
    Abstract: A wireless power transmission system using multiple coils comprises a transmitter; and a receiver, wherein the transmitter includes a module for receiving a predetermined voltage, and a primary coil for generating a primary resonance frequency in accordance with the received voltage. The receiver spaced apart from the transmitter includes a load for emitting light, capacitors connected in series or in parallel in accordance with an equivalent resistance of the load, and a secondary coil for generating a secondary resonance frequency greater than the primary resonance frequency.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: June 4, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Byungsang Jung, Seonghun Lee, Hwanyong Kim, Seonwook Park, Seungje Park, Yongjun Son, Jaesung Yang, Gyoocheol Choi
  • Patent number: 10250861
    Abstract: According to the present invention there is provided methods and devices for detecting open and/or short circuits in MEMS micro-mirror devices, which use relative comparisons of voltage levels within the MEMS micro-mirror devices for detecting the occurrence of open and/or short circuits.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: April 2, 2019
    Assignee: North Inc.
    Inventors: Eric Chevallaz, Nicolas Abele
  • Patent number: 10219215
    Abstract: A method of driving a network device for outputting signals to a physical network transmission medium. The network device includes a DAC circuit that comprises a plurality of digital-to-analog conversion units. Each digital-to-analog conversion unit includes a first auxiliary current source and a second auxiliary current source. The method includes the steps of: detecting a length of the physical network transmission medium; generating a control signal according to the length; generating a bias signal according to the control signal; applying the bias signal to the first auxiliary current source and the second auxiliary current source to control the currents of the first auxiliary current source and the second auxiliary current source.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: February 26, 2019
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Chien-Ming Wu
  • Patent number: 10164435
    Abstract: A reactive power compensator includes a plurality of phase clusters each including plurality of cells and a controller configured to control the plurality of phase clusters. The controller performs control to generate an offset signal through phasor transformation based on respective voltage values and current values of the plurality of phase clusters and to compensate for energy errors between the plurality of phase clusters based on the generated offset signal.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: December 25, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Yong Ho Chung, Gum Tae Son, Seung Ki Sul, Jae Jung Jung, Joon Hee Lee
  • Patent number: 10141782
    Abstract: A power transmitter transfers power to a power receiver using a wireless power signal. The power transmitter comprises an inductor driven by a power signal generator to provide the power signal. A calibration controller determines whether a power loss calibration has been performed for the power transmitter and power receiver pairing. The calibration adapts an expected relationship between a received power indication provided by the power receiver and a transmitted power indication for the power transmitter. A power limiter restricts the power provided to the inductor to not exceed a threshold unless a power loss calibration has been performed for the pairing. The expected relationship may be used to detect unaccounted for power losses, e.g. due to foreign objects being present. The calibrated expected relationship may provide improved accuracy allowing accurate detection at higher power levels. At lower power levels such accuracy is not needed, and no calibration needs to be performed.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: November 27, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventor: Andries Van Wageningen
  • Patent number: 9888553
    Abstract: A device for controlling a plurality of electrical consumers to which a constant control current is applied at control nodes. A transformer to which a regulated and/or constant predetermined frequency current is applied at the input end has at least one first and a second winding at the output end which have a common tap, first and second circuit branches forming first and second control nodes for first and second electrical consumers are associated with the first and second windings respectively. The first and second circuit branches each have a magnetically interacting pair of reactors which are wound in opposite relative directions. The first and second reactors of the pair are connected to the first and second control nodes, respectively, via a rectifier. The reactors that are connected to one of the control nodes are oppositely wound. Reactors pairs are magnetically coupled, in particular having a common reactor core.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: February 6, 2018
    Assignee: EXSCITRON GmbH
    Inventors: Stephan Gruber, Rene Franzky, Winfried Beyer
  • Patent number: 9876390
    Abstract: When the preferred voltage source for a static transfer switch is a UPS, there can be a brief interruption in the voltage received from the UPS while the UPS is switching from economy mode to normal mode. Operation of the static transfer switch can be improved during such voltage disturbances. Specifically, the static transfer switch may be in data communication with the UPS and thereby made aware that the voltage disturbance is temporary. As a result, the static transfer switch can avoid an unnecessary transfer to an alternate voltage source.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: January 23, 2018
    Assignee: Liebert Corporation
    Inventors: Terry D. Bush, Brian P. Heber, Russell E. Shetler, Jr., Peter A. Panfil
  • Patent number: 9846382
    Abstract: An image forming apparatus includes an image processing unit and a switching unit. The image processing unit includes: a charging unit that is provided to face an image carrier and applies a direct current voltage on which an alternating voltage of a first frequency is superimposed to charge the image carrier; an electrostatic latent image forming unit that forms an electrostatic latent image on the charged image carrier with light scanning based on image information; a developing unit that develops the electrostatic latent image; and a transfer unit that transfers the developed image to a recording medium. When an image density based on the image information is greater than or equal to a specific image density, the switching unit switches a frequency of the alternating voltage at least during charging performed by the charging unit to a second frequency different from the first frequency.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: December 19, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinya Makiura, Hirofumi Hamada
  • Patent number: 9729069
    Abstract: A control section for a current resonant converter section controls a DC output voltage of a current resonant converter section to settle to a target voltage by varying a resonant period between predetermined two resonant periods based on an error signal between the DC output voltage and the target voltage. A gain converter is provided in a preceding stage of a frequency generator for generating a square waveform signal with a duty ratio of 50% and the gain converter has a setting of a nonlinear gain characteristic that cancels nonlinearity in the input-output characteristics of the current resonant converter section. The nonlinear gain characteristic can be a characteristic of continuous gain conversion or discrete gain conversion.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: August 8, 2017
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Tetsuya Kawashima
  • Patent number: 9673731
    Abstract: Provided are a parallel inverter system, and a shutdown control method and a shutdown control device for the parallel inverter system. A shutdown instruction is determined and responded according to a level of the shutdown instruction. The shutdown instruction is determined to be an emergency shutdown instruction under certain emergency shutdown conditions, and a driving signal for the power switch devices of the inverter apparatus is needed to be instantly locked out. The shutdown instruction is determined to be a normal shutdown instruction under non-emergency shutdown conditions, a switch-off signal is transmitted to alternating-current switches connected to the inverter apparatus to be shut down, states of the alternating-current switches connected to the inverter apparatus to be shut down are detected, the driving signal for the power switch devices of the inverter apparatus to be shut down is instantly locked out in a case that the alternating-current switches are switched off.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: June 6, 2017
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Lin Cheng, Nianan Pan, Zhicheng Wang, Lei Tao
  • Patent number: 9647572
    Abstract: A method for controlling a converter including a resonant circuit, where the converter is controlled such that control switches are switched into a first state at the occurrence of an event that is related to a dependent variable of the converter and are switched into a second state at the occurrence of an event that is not related to a dependent variable of the converter. The method may be employed in a converter or an inductive power transfer transmitter.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: May 9, 2017
    Assignee: PowerbyProxi Limited
    Inventors: Daniel James Robertson, Saining Ren, Eugenio Sia Lecias, Jr.
  • Patent number: 9608434
    Abstract: An inverter apparatus includes a direct current to direct current converter (DC/DC converter), a direct current to alternating current converter (DC/AC converter), a primary-side control circuit and a secondary-side control circuit. The DC/DC converter is arranged for outputting a first DC power and a second DC power. The DC/AC converter is coupled to the DC/DC converter, and is arranged for receiving the first DC power. The primary-side control circuit is coupled to the DC/DC converter, and is arranged for controlling an operation of the DC/DC converter. The secondary-side control circuit is coupled to the DC/DC converter and the DC/AC converter, and is arranged for receiving the second DC power, and controlling an operation of the DC/AC converter according to the second DC power.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 28, 2017
    Assignee: FSP TECHNOLOGY INC.
    Inventors: Han-Wei Chen, Chun-Hao Yu, Chia-Hua Liu
  • Patent number: 9450495
    Abstract: There is provided a single stage forward-flyback converter including a power converting unit switching input power to perform a forward power conversion operation while being switched on and perform a flyback power conversion operation while being switched off, a path providing unit clamping power formed by the forward power conversion operation of the power converting unit and power formed by the flyback power conversion operation thereof to provide power transfer paths, and a controlling unit controlling the power conversion operation of the power converting unit according to a voltage level of the input power.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: September 20, 2016
    Assignee: SOLUM CO., LTD
    Inventors: Sang Kyoo Han, Byoung Woo Ryu, Heung Gyoon Choi, Keun Wook Lee, Hong Sun Park
  • Patent number: 9444326
    Abstract: A SEPIC-type voltage converter for converting an input voltage supplied by a power supply into an output voltage comprises an inductive component comprising primary and secondary windings, an output capacitor for delivering power to a load by way of an output node, an AC coupling capacitor, a first rectifier for rectifying the output voltage, and a switch for periodically switching between an ON state in which the primary winding is energized by the power supply and in which the secondary winding is energized by the coupling capacitor, and an OFF state in which the output capacitor is charged by both the primary winding and the secondary winding. A second rectifier is connected in series with the secondary winding and the secondary winding is inductively coupled to the primary winding such that the secondary winding is influenced by changes in the voltage applied across the primary winding by the power supply.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: September 13, 2016
    Assignee: TDK-LAMBDA UK LIMITED
    Inventors: Andrew John Skinner, Atul Shriram Abhyankar, Carlos Toyos Bada
  • Patent number: 9391532
    Abstract: In accordance with an embodiment, a power converter includes an H-bridge switching arrangement, a transformer having a primary winding coupled to an output of the H-bridge switching arrangement, a first switch coupled between a power input of the H-bridge switching arrangement and a first power supply node, and a second switch coupled between a center-tap of the primary winding of the transformer and a low impedance node.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: July 12, 2016
    Assignee: Infineon Technologies AG
    Inventors: Tomas Reiter, Sandra Zeljkovic
  • Patent number: 9325248
    Abstract: A converter with at least one or more transformers having at least one primary side magnetically coupled to at least one secondary side, the primary side being electrically isolated from the secondary side, wherein a first transformer has first and second sets of coils and a second transformer has third and fourth sets of coils. The first set of coils is connected in series to the third set of coils, wherein one of the secondary sides is connectable to an external output unit, wherein another secondary side is connectable to an external input source, wherein the two secondary sides are electrically isolated from each other, wherein the primary side is adapted to drive the transformers that are connectable to an external power source. The converter uses a shared current path and an isolated current-to-current transfer between the input and output sides to replicate the input current to an output current.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: April 26, 2016
    Assignee: PR Electronics A/S
    Inventors: Stig Alnøe Lindemann, Dan Vinge Madsen
  • Patent number: 9312775
    Abstract: A switched mode power converter includes a closed loop feedback control mechanism for regulating an output characteristic and a resonant type circuit for inclusion of resonant energy delivery. The characteristic impedance of the resonant type circuit is modified from an optimal energy transfer configuration to one that dampens fluctuations in a feedback signal used by the closed loop feedback mechanism. The modified characteristic impedance functions to dampen those fluctuations in the feedback signal resulting from leakage inductance energy provided by the resonant type circuit.
    Type: Grant
    Filed: April 17, 2013
    Date of Patent: April 12, 2016
    Assignee: Flextronics AP, LLC
    Inventor: Mark Telefus
  • Patent number: 9300206
    Abstract: A controller for estimating a power of a power converter and method of estimating the same has been introduced herein. In one embodiment, the controller includes an analog/digital converter configured to provide samples of a rectified voltage waveform corresponding to a rectified sensed voltage of the power converter. The controller also includes a processor configured to estimate a minimum value of the rectified voltage waveform in accordance with the samples and remove an offset from the rectified voltage waveform to obtain an unbiased rectified voltage waveform in accordance with the estimate of the minimum value. The controller is also configured to obtain an unbiased rectified current waveform corresponding to sensed current of the power converter and provide an average power of the power converter.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: March 29, 2016
    Assignee: Power Systems Technologies Ltd.
    Inventors: Zhen Z. Ye, Jamie L. Dunn
  • Patent number: 9276401
    Abstract: A solid state circuit-breaker switch has a first solid state switch coupled to a positive terminal of a high voltage source, a second solid state switch coupled to a return terminal of the high voltage source, and a diode connected between the switches. A load is coupled between the switches and in parallel with the diode such that voltage transients across the load are limited during turn of conditions. Related methods of operating the switch during turn-on and turn-off events within rated current operation are described, as are turn-on and turn-off events in overload conditions.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: March 1, 2016
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Steven J. Moss
  • Patent number: 9270189
    Abstract: A power converter apparatus includes a primary bridge having a plurality of diagonally opposed primary power elements, and a secondary bridge having a plurality of diagonally opposed secondary power elements. The primary and secondary bridges are electrically coupled by a transformer. At least one control unit is configured to phase-shift switch the primary and secondary power elements, such that one or more of the primary and secondary power elements are switched off under near-zero current conditions to reduce voltage and current stresses and commutation losses within the power converter.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: February 23, 2016
    Assignee: General Electric Company
    Inventors: Sebastian Pedro Rosado, Henry Todd Young, Simon Herbert Schramm, Alvaro Jorge Mari Curbelo, Jason Daniel Kuttenkuler, Zhihui Yuan
  • Patent number: 9238140
    Abstract: An improved arrangement for detecting DC current leakage in implanted devices is disclosed. Currents are monitored, so that any unexpected imbalance indicates that a fault condition has occurred. The principle of the system is that if everything working correctly, the same current should be flowing into the tissue from VDDH-ELEC as is passing out of the tissue into VSS_ELEC. Any difference is indicative of current flowing into or out of the tissue from unknown paths, which is indicative of some fault. This replaces routine monitoring for specific faults.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: January 19, 2016
    Assignee: Cochlear Limited
    Inventors: Yashodhan Moghe, Helmut Christian Eder
  • Patent number: 9198254
    Abstract: A light emitting diode (LED) backlight driving circuit includes an LED lightbar, and a driver integrated circuit (IC) coupled to the LED lightbar. The driver IC is configured with a protection pin that controls the driver IC to enter a protection mode when a voltage of the protection pin exceeds a preset voltage range, an undervoltage module is coupled between a power input end of the LED lightbar and the protection pin, and an overvoltage protection module is coupled between a power output end of the LED lightbar and the protection pin. An output overvoltage protection module is coupled between the power output end of the LED lightbar and the protection pin. The input undervoltage protection module outputs a first control voltage that exceeds the preset voltage range to the protection pin when the power input end of the LED lightbar is in an undervoltage state.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: November 24, 2015
    Inventor: Xianming Zhang
  • Patent number: 9178434
    Abstract: Some implementations are directed to a A DC-to-DC converter that includes a power transformer having a primary side and a secondary side and a plurality of power transistors coupled to the primary side of the transformer. The converter also includes a secondary bias supply coupled to the secondary side of the transformer and a secondary side controller coupled to the secondary side of the transformer and configured to generate a feedback control signal based on a voltage level associated with the secondary side of the transformer. The secondary side controller receives operating power only from the secondary bias supply.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: November 3, 2015
    Assignee: Texas Instruments Incorporated
    Inventor: Steven J. Tumasz
  • Patent number: 9172432
    Abstract: This system for coupling between a wire communication link exhibits a characteristic line impedance suitable for transporting a single signal simultaneously comprising an electrical power supply and data, and a control unit comprising an electrical power supply terminal and a data terminal, said system exhibiting an input impedance. This system comprises means for adapting the input impedance so as to match the characteristic line impedance.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: October 27, 2015
    Assignee: Alstom Transport Technologies
    Inventor: Jacques Orion
  • Patent number: 9114763
    Abstract: A battery pack includes a main battery pack and a sub-battery pack. Each of the main battery pack and the sub-battery pack includes a power supply including a plurality of unit cells, a service plug connector including shutoff terminals of the power supply, and an output connector including output terminals of the power supply. The output connector is in a form of a connector capable of being mated with the service plug connector and a power supply connector of a vehicle.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: August 25, 2015
    Assignee: YAZAKI CORPORATION
    Inventor: Yoshiaki Ichikawa
  • Patent number: 9118243
    Abstract: A power converter (14) can include a switching system (18) to convert a direct current (DC) input voltage to an output voltage based on a switching signal having a duty-cycle. A controller (16) can set the duty-cycle of the switching signal, depending on the DC input voltage, to one of a substantially constant value, such that the output voltage follows the DC input voltage in a normal mode, and a value that varies inversely with respect to the DC input voltage, such that the output voltage is substantially constant in another mode.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: August 25, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David Paul Mohr, Daniel Humphrey
  • Patent number: 9083252
    Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: July 14, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Erhan Ozalevli, David Daniels, Luthuli E. Dake
  • Patent number: 9071079
    Abstract: The present disclosure provides a power supply system. The power supply system includes a plurality of power supply devices connected in parallel. Output terminals of the plurality of power supply devices are coupled to a common supply line. Each of the plurality of power supply devices includes a DC-to-DC converter, a transformer, a switching control device, a rectifying device, and a judging device. The judging device receives a feedback voltage, an error signal and a second AC voltage to determine whether the power supply device is normal, wherein the feedback voltage is a voltage division of an output voltage on the common supply line, the error signal is an output of the switching control device, and the second AC voltage is retrieved from a second winding set of the transformer.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: June 30, 2015
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chu Kuang Liu, Ching Long Tsai, Hung Liang Cho, Wei Hsin Wen
  • Publication number: 20150138839
    Abstract: An AC-to-DC converter circuit includes DC-to-DC converter that in turn includes a secondary side circuit. The secondary side circuit includes a secondary winding, a pair of bipolar transistor-based self-driven synchronous rectifiers, a pair of current splitting inductors, and an output capacitor. Each of the synchronous rectifiers includes a bipolar transistor and a diode whose anode is coupled to the transistor collector and whose cathode is coupled to the transistor emitter. The current splitting inductors provide the necessary base current to the bipolar transistors at the appropriate times such that the bipolar transistors operate as synchronous rectifiers.
    Type: Application
    Filed: November 18, 2013
    Publication date: May 21, 2015
    Applicant: IXYS CORPORATION
    Inventor: Kyoung Wook Seok
  • Patent number: 9006624
    Abstract: An induction heating system includes an induction heating coil operable to inductively heat a load with a magnetic field, a detector for detecting a current feedback signal corresponding to a current flowing through the induction heating coil, and a controller for detecting a switching transient in the current feedback signal and determining a resonant frequency of the system based on a characteristic of the switching transient.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: April 14, 2015
    Assignee: General Electric Company
    Inventors: Daniel Brosnan, Mariano Filippa, Kresimir Odorcic
  • Patent number: 9001534
    Abstract: A transformer driver circuit couples to a transformer having a primary winding, a secondary winding, and a transformer tap that is connected to a first voltage source. The primary winding electrically connects at its ends to respective unipolar controllable current sinks that form part of an integrated circuit. The transformer driver circuit operates by each current sink selectively sinking current from the end of the primary winding to which it is connected so as to cause current to flow in the secondary winding in a push-pull fashion. The transformer driver circuit further includes a load electrically connected to the secondary winding and protection circuitry operative to protect the integrated circuit from input levels greater than it can withstand.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: April 7, 2015
    Assignee: Broadcom Europe Limited
    Inventors: Jonathan Ephraim David Hurwitz, Seyed Danesh, Steven Maughan
  • Patent number: 8964413
    Abstract: A resonant converter comprising: a controllable current source; a resonant tank circuit coupled to the current source; and an isolated buck-type converter coupled to the resonant tank circuit, the isolated buck-type converter having an output, wherein the resonant tank circuit enables switches in the isolated buck-type converter to switch under soft-switching conditions. In some embodiments, the controllable current source is a switch-mode-type current source. In some embodiments, the isolated buck-type converter comprises a half-bridge converter. In some embodiments, the isolated buck-type converter comprises a full-bridge converter. In some embodiments, the isolated buck-type converter comprises a push-pull converter.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: February 24, 2015
    Assignee: Flextronics AP, LLC
    Inventor: Martin Liu
  • Publication number: 20150036390
    Abstract: An apparatus comprises a power converter circuit and a control circuit. The power converter circuit includes a primary circuit side and a secondary circuit side. The primary circuit side includes a plurality of primary switches, and the secondary circuit side includes a plurality of synchronous rectifiers and an inductor. The control circuit is configured to operate the synchronous rectifiers synchronously with the primary switches when inductor current at the inductor is greater than or equal to a reference inductor current, and operate the synchronous rectifiers in a bidirectional mode when the inductor current is less than the reference inductor current, wherein energy is delivered from the primary side to the secondary side and from the secondary side to the primary side during the bidirectional mode.
    Type: Application
    Filed: July 31, 2013
    Publication date: February 5, 2015
    Inventors: Yingyang Ou, Renjian Xie, Qingyi Huang
  • Patent number: 8929104
    Abstract: The present invention provides a new type flow control system comprising a valve control circuit and a power source circuit. Two terminals of the primary coil of the power source circuit transformer are respectively connected with two power source circuit FETs, the secondary coil of the power source circuit transformer is connected to the voltage output terminal of the power source circuit through a power source rectification circuit. The gates of the power source circuit FETs are connected with a switching regulator. The AC input terminal of the valve control circuit is connected with a valve control circuit transformer. The primary coil of the valve control circuit transformer is connected with a valve control circuit FET, the secondary coil of the transformer is connected to a mechanical valve through a valve control rectification circuit. A microcontroller outputs PWM signals to the gate of the valve control circuit FET.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: January 6, 2015
    Assignee: Bejing Sevenstar Electronics Co., Ltd.
    Inventors: Changhua Mou, Maolin Wang
  • Publication number: 20140376281
    Abstract: A switching power supply device wherein an input voltage is stepped-up by first and second switching elements that are driven on and off in a complementary way, thus obtaining a stabilized output voltage. The switching power supply device includes a comparator that detects fluctuation in an operating reference potential of the second switching element accompanying fluctuation in the input voltage, and a drive signal generator circuit that carries out a logical operation on an output control signal, a dead time signal, and the output signal of the comparator, thus generating first and second drive signals that determine the on-state time of the first and second switching elements.
    Type: Application
    Filed: September 12, 2014
    Publication date: December 25, 2014
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Hidetomo OHASHI
  • Publication number: 20140362607
    Abstract: A magnetic integration double-ended converter with an integrated function of a transformer and an inductor includes an integrated magnetic member having a magnetic core with three magnetic columns having at least three windings (NP, NS1, NS2) and at least one energy storage air gap, where a primary winding (NP) and a first secondary winding (NS1) are both wound around a first magnetic column or are both wound around a second magnetic column and a third magnetic column, and a second secondary winding (NS2) is wound around the second magnetic column; an inverter circuit with double ends symmetrically working, acting on the primary winding (NP); and a group of synchronous rectifiers (SR1, SR2), gate electrode driving signals of which and gate electrode driving signals of a group of power switch diodes (S1, S2) of the inverter circuit with the double ends symmetrically working complement each other.
    Type: Application
    Filed: August 22, 2014
    Publication date: December 11, 2014
    Inventors: Zengyi Lu, Yongfa Zhu, Yadong Bai, Wei Chen, Zhaoguo Jin
  • Publication number: 20140362616
    Abstract: A dual resonance circuit is formed of two transformers, two resonance inductors and two resonance capacitors for a resonance type switching power supply employing parallel connected transformers. The secondary winding of the transformer is configured in a center tap structure, and a top and bottom symmetrical voltage multiplying rectifier is connected to the secondary winding coupled with the parallel connected transformers, thereby obtaining the same effect as when one transformer is used. The present invention achieves a low loss in the typical resonance type half bridge power supply even though two transformers are employed, and the switching power supply with a lowered height and thinned structure can be provided with the aid of the optimized arrangements of the resonance devices. The internal power loss can be lowered by using two parallel connected transformers as compared to a resonance type switching power supply which employs one transformer.
    Type: Application
    Filed: June 17, 2013
    Publication date: December 11, 2014
    Inventor: Tae-Young AN
  • Patent number: 8896230
    Abstract: The present invention provides an LED backlight drive circuit, which includes a first power supply module, an electrical inductor, a rectifier diode, a MOS transistor, an electrolytic capacitor, an LED light string, a voltage division module, a voltage comparator, a second power supply module, and an LED constant-current drive chip. The LED backlight drive circuit is arranged to include a voltage comparator in an external circuit of the LED constant-current drive chip to detect output voltage of the drive circuit so that high voltage, the voltage comparator is caused to supply a low voltage level to forcibly pull down a PWM dimming signal or an ENA enabling signal of the LED constant-current drive chip to achieve an over-voltage protection function and also enable removal of over-voltage protection module from a conventional LED constant-current drive chip.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: November 25, 2014
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd.
    Inventor: Hua Zhang
  • Patent number: 8890366
    Abstract: A system for exchanging energy wirelessly comprises an array of at least three objects having a resonant frequency, each object is electromagnetic (EM) and non-radiative, and generates an EM near-field in response to receiving the energy, wherein each object in the array is arranged at a distance from all other objects in the array, such that upon receiving the energy the object is strongly coupled to at least one other object in the array via a resonant coupling of evanescent waves; and an energy driver for providing the energy at the resonant frequency to at least one object in the array, such that, during an operation of the system, the energy is distributed from the object to all other objects in the array.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Bingnan Wang, Koon Hoo Teo, Da Huang
  • Patent number: 8878456
    Abstract: A filter device (10) for filtering high-frequency interferences, such as due to switching flanks of a DC converter, has a current path (4) between an input (2) and an output (3), and an inductor (L) in the current path (4), wherein the inductor (L) is disposed in the current path (4) as a first component and is connected to the input (2), and wherein a reverse polarity protective diode (D) is disposed in series with the inductor (L) downstream thereto.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: November 4, 2014
    Assignee: Continental Automotive GmbH
    Inventors: Stefan Holzinger, Christian Stöger
  • Patent number: 8861228
    Abstract: A high voltage controller configured to drive a high voltage generator. The high voltage controller includes a voltage select input and a current select input, an actual voltage input and an actual current input. First circuitry is configured to generate an alternating current (AC) drive signal. Second circuitry configured to generate a direct current (DC) drive signal. Closed loop control circuitry is configured to adjust the DC drive signal based on at least one of the voltage select and current select inputs and at least one of the actual voltage and actual current inputs. The first circuitry may include a push-pull circuit. The second circuitry may include a pulse width modulation (PWM) controller. A high voltage generator may be coupled to the AC and DC drive signals. The high voltage generator may include a high voltage transformer having a pair of primary windings and center tap. The AC drive signal may be coupled to the primary windings and the DC drive signal may be coupled to the center tap.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: October 14, 2014
    Assignee: Durr Systems GmbH
    Inventors: Farhad Berton, Josef Braun
  • Publication number: 20140293662
    Abstract: A switched mode power supply (SMPS) is disclosed in which a simple primary side controller is used to send a single pulse of energy to the secondary side to switch on an output voltage controller. The pulse is sent across the main power train and a filtering arrangement is provided on the secondary side to minimise the energy at the output of the SMPS while maximising the energy supplied to the output voltage controller. Advantageously, the SMPS is configured such that the maximum amount of energy transferred from the primary side to the secondary side during a start-up operation is inherently limited. Protection against short circuit conditions and malfunctions is therefore provided without requiring complicated circuitry.
    Type: Application
    Filed: April 15, 2011
    Publication date: October 2, 2014
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Oscar Persson, Mikael Appelberg, Marko Leskovec
  • Patent number: 8817498
    Abstract: A DC to DC converter system, includes inverter circuitry having a first and a second switch, the inverter circuitry further configured to generate a first and a second gate control signal, the signals configured to open and close the first and second switch, respectively, and generate an AC signal from a DC input signal. The system further includes transformer circuitry configured to transform the AC signal into a sinusoidal AC signal, second stage circuitry configured to rectify the sinusoidal AC signal to a DC output signal, and hybrid control circuitry configured to modulate the first and second gate control signals, wherein the modulation comprises pulse frequency modulation (PFM) and pulse width modulation (PWM).
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: August 26, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Hangseok Choi
  • Patent number: 8787044
    Abstract: An energy recovery snubber circuit for use in switching power converters. The power converters may include a switch network coupled to a primary winding of an isolation transformer, and rectification circuitry coupled to a secondary winding of the isolation transformer. The energy recovery snubber circuit may include clamping circuitry that is operative to clamp voltage spikes and/or ringing at the rectification circuitry. The clamped voltages may be captured by an energy capture module, such as a capacitor. Further, the energy recovery snubber circuitry may include control circuitry operative to return the energy captured by the energy capture module to the input of the power converter. To maintain electrical isolation between a primary side and a secondary side of the isolation transformer, a second isolation transformer may be provided to return the captured energy back to the input of the power converter.
    Type: Grant
    Filed: May 7, 2010
    Date of Patent: July 22, 2014
    Assignee: Flextronics AP, LLC
    Inventors: Zaohong Yang, Paul Garrity
  • Patent number: 8724348
    Abstract: A power-supply unit including a transformer, a full bridge circuit having four arm switches on a primary side of the transformer, a rectifier and smoothing circuit including two synchronous rectifier switches on a secondary side of the transformer, a choke coil, and a capacitor, an output terminal in the rectifier and smoothing circuit, a control circuit controlling ON/OFF of the four arm switches of the full bridge circuit and the two synchronous rectifier switches of the rectifier and smoothing circuit, a resonant inductor including a leakage inductor component and a parasitic inductor component on the primary side of the transformer, and a resonant capacitor, and in which the control circuit includes a timing variable unit which varies switching timings of the two synchronous rectifier switches of the rectifier and smoothing circuit based on an output current flowing in the output terminal provided in the rectifier and smoothing circuit.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: May 13, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Sase, Akihiko Kanouda, Yosuke Tsuyuki
  • Patent number: 8711580
    Abstract: A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: April 29, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Jinfa Zhang, Lei Cai, Jiaojun Sun, Guodong Yin
  • Patent number: 8699237
    Abstract: An inverter with soft switching is used for a high step-up ratio and a high conversion efficiency. The inverter includes an isolation voltage-quadrupling DC converter and an AC selecting switch. The isolation voltage-quadrupling DC converter includes an active clamping circuit. By a front-stage converter circuit, a continuous half-sine-wave current is generated. By a rear-stage AC selecting switch, the half-sine-wave current is turned into a sine-wave current. Thus, electricity may be supplied to an AC load or the grid. The circuit is protected by isolating the low-voltage side from the high-voltage side. The conversion efficiency is high. The leakage inductance is low. The switch stress is low. The inverter is durable and reliable. Hence, the inverter is suitable for use in a photovoltaic system to increase the total conversion efficiency.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: April 15, 2014
    Assignee: National Tsing Hua University
    Inventors: Ching-Tsai Pan, Ming-Chieh Cheng, Yu-Chuan Wang, En-Lin Chen
  • Patent number: 8659916
    Abstract: A control circuit for a resonant power converter and a control method thereof are disclosed. The control circuit comprises a first transistor and a second transistor switching a transformer through a resonant tank. A controller receives a feedback signal for generating a first switching signal and a second switching signal coupled to drive the first transistor and the second transistor respectively. The feedback signal is correlated to an output of the resonant power converter. A diode is coupled to the second transistor for detecting the state of the second transistor for the controller. The first switching signal and the second switching signal are modulated to achieve a zero voltage switching (ZVS) for the second transistor.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: February 25, 2014
    Assignee: System General Corp.
    Inventors: Ta-Yung Yang, Tien-Chi Lin