Utilizing Pulse-width Modulation Patents (Class 363/26)
  • Patent number: 10126692
    Abstract: A power supply control device including a chopper circuit generating a heater current for a halogen heater, a current feedback circuit generating a current feedback signal indicating a current amount based on an amount of the heater current, and a constant current circuit performing pulse-width modulation of the heater current amount according to a difference between a target heater current amount and the current amount indicated by the current feedback signal. The current feedback circuit switches between methods at least including a first method and a second method for generating the current feedback signal. The current feedback signal indicates a greater current amount with the first method than with the second method, and the current feedback circuit uses the first method during a period with a predetermined time length starting from when the halogen heater is turned on, and uses the second method after elapse of the period.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: November 13, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Mikiyuki Aoki, Seiichi Kirikubo, Taku Kimura, Akinori Kimata, Takeshi Tamada
  • Patent number: 10116231
    Abstract: Power supply units (PSU) provide for digital current-sharing loop control to ensure output voltage regulation during dynamic load transients by (i) delaying an internal current signal to match a delay in a shared current signal, and (ii) controlling the output amplifier based on the shared current signal and the delayed local current signal to maintain the respective local DC electrical power in proportion to contributions by other ones of the more than one PSU to the shared DC electrical power and thereby avoid instability in dynamic response to a load transient induced by the power consuming component.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: October 30, 2018
    Assignee: Dell Products, L.P.
    Inventors: Wen-Hung Huang, Kunrong Wang, Yu-Mei Chen
  • Patent number: 10036768
    Abstract: An electricity meter comprises a voltage sensor configured to determine an AC line voltage. A measurement circuit is coupled to the voltage sensor and is configured to determine energy consumption data based at least in part on the AC line voltage. A communications device is coupled to the measurement circuit and is configured to transmit the energy consumption data to a remote location. The electricity meter further includes a power supply configured to provide a DC voltage to the communications device. A switch is positioned between the power supply and the communications device. A switch controller is coupled to the measurement circuit and is configured to control the switch and the associated DC voltage supplied to the communications device depending at least in part on the AC line voltage.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: July 31, 2018
    Assignee: Landis+Gyr LLC
    Inventor: Anibal Diego Ramirez
  • Patent number: 9985547
    Abstract: A synchronous rectifier controller is provided on a secondary side of an insulation-type synchronous DC/DC converter and controls the synchronous rectifier transistor. A driver circuit controls the synchronous rectifier transistor. A photo coupler connection terminal is coupled to an input side of the photo coupler. An error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: May 29, 2018
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Patent number: 9819273
    Abstract: An isolated power conversion apparatus has an isolation transformer, a series circuit including a load and an inductor connected in series with each other, the series circuit being disposed on a secondary side of the isolation transformer, and one or a plurality of switching means disposed between the series circuit and the secondary side of the isolation transformer, the switching means being bidirectional. This apparatus sends out power from a DC power supply of a primary side of the isolation transformer toward the load as DC power or AC power of an arbitrary polarity, or regenerates and supplies the DC power or AC power from the load to the DC power supply.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: November 14, 2017
    Assignee: NF CORPORATION
    Inventor: Osamu Furukawa
  • Patent number: 9608518
    Abstract: A power supply device includes a master power supply module, a slave power supply module and a control module. The master power supply module is configured to output a master output current and an output voltage according to a master control signal. The slave power supply module is electrically connected in parallel to the master power supply module and configured to output a slave output current and the output voltage according to a slave control signal. The control module is electrically connected to the master power supply module and the slave power supply module and configured to output the master control signal according to the output voltage, generate a current compensation signal according to the master output current and the slave output current, and output the slave control signal according to the output voltage and the current compensation signal which is based on the master output current.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: March 28, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Guo-Dong Yin, Ben Wu, Zhi-Wei Liu
  • Patent number: 9531250
    Abstract: A power conversion device according to the present invention includes a power supply, a booster unit (a reactor, a switch) that boosts a voltage supplied from the power supply by switching control, a smoothing circuit that smoothes an output voltage from the booster unit, a rectifier that is arranged between the booster unit and the smoothing circuit to prevent a current reverse flow toward the booster unit, and a commutation unit that is connected to the rectifier in parallel to commutate a current flowing through the rectifier toward itself.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: December 27, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Koichi Arisawa, Takuya Shimomugi, Yosuke Shinomoto
  • Patent number: 9509374
    Abstract: Disclosed herein are a wireless power transmission apparatus and a transmission method thereof. The wireless power transmission apparatus is configured to include a wireless power transmitter generating a wireless power signal to be wireless transmitted, wirelessly transmitting the generated wireless power signal by a magnetic resonance manner, receiving a reflection wireless power signal to determine whether or not a load apparatus is presented, and supplying power to the load apparatus; and a wireless power receiver connected to the load apparatus and receiving the transmitted wireless power signal by the magnetic resonance manner and supplying it to the connected load apparatus and reflecting the remaining wireless power signal to the wireless power transmitter, whereby a transmission apparatus can recognize a receiving environment and resonance characteristics are improved, without a separate communication device or a system.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: November 29, 2016
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jeong Hoon Kim, Kwang Du Lee, Chul Gyun Park, Jung Ho Yoon, Eung Ju Kim, Sang Hoon Hwang
  • Patent number: 9496828
    Abstract: An envelope tracking power supply has a multiple-output DC/DC converter, having an alternating current generating portion and a full rectifying portion. The alternating current generating portion to receive an input voltage and operate at zero voltage switching. A full rectifying portion includes at least one secondary winding and one voltage doubler output. each having a first transistor, and a second transistor, used as rectifier devices to allow currents to flow bi-directionally and sink and source the currents from and to output capacitors to keep their voltage balance. A switch bank selects a desired voltage from series connected capacitors and connects it to an output filter. The switch bank receives an envelope tracking command from the voltage selector and provides a step voltage to the output. The output voltage is changed at switching speed to track a high bandwidth envelope signal.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: November 15, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Zhong Ye
  • Patent number: 9438128
    Abstract: A synchronous rectifier controller is provided on a secondary side of an insulation-type synchronous DC/DC converter and controls the synchronous rectifier transistor. A driver circuit controls the synchronous rectifier transistor. A photo coupler connection terminal is coupled to an input side of the photo coupler. An error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: September 6, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Hiroki Kikuchi
  • Patent number: 9263967
    Abstract: An AC/DC converter that converts an AC input voltage Vin to a DC output voltage comprises an inductor, a capacitor selectively coupled to the inductor, a plurality of switches, and a controller. The controller configures the plurality of switches, inductor, and capacitor to operate as a buck converter during times when Vin>Vout and to operate as an inverting buck converter during times when Vin<?Vout. The controller modulates the duty cycles of the plurality of switches to regulate the DC output voltage Vout to the desired, constant output level.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: February 16, 2016
    Inventor: Earl W. McCune
  • Patent number: 9231481
    Abstract: A power converter having reduced switching transients includes a conversion inductance, a pulse width modulation (PWM) controller, a conversion inductance, and a switch transistor. A low pass filter is connected between the PWM controller and the switch transistor to filter a PWM signal produced by the PWM controller and produce a filtered PWM signal. The switching transistor switches current through the conversion inductance responsive to the filtered PWM signal. The low pass filter filters out harmonic content of the PWM signal that is above the fundamental frequency in a way that maintains most of the harmonic content of the PWM signal to substantially eliminate higher harmonic elements which are conventionally responsible for transients across the conversion inductance.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: January 5, 2016
    Assignee: Motorola Solutions, Inc.
    Inventor: David W Wallis
  • Patent number: 9189004
    Abstract: A control circuit, control method used in a PFC circuit and the power source system thereof are disclosed herein. The control circuit comprises: a zero current detection circuit having a polarity detection circuit for outputting a first and a second digital signals and a signal conversion circuit for generating an analog signal; a feedback circuit for generating a driving pulse signal; and a pulse distribution circuit for distributing the driving pulse signal to a first and a second switches according to the first and the second digital signal. After a switch cycle, one of the first and the second switch performs an ON operation for the next switch cycle when the current flowing through the inductor decreases to a predetermined threshold value, wherein an ON time of the first switch is equal in each switch cycle, and an ON time of the second switch is equal in each switch cycle.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: November 17, 2015
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Hong-Yuan Jin, De-Sheng Guo, Hong-Jian Gan, Jian-Ping Ying
  • Patent number: 9130471
    Abstract: An assembly includes a converter and a controller. The converter has a winding around a transformer core, first and second switches configured to alternately connect respective winding segments to an input power, and first and second resistors respectively connected in series with the switches. The controller is configured to compare voltages corresponding to currents through the resistors and terminate operation of the converter when a difference between the voltages exceeds a threshold indicative of transformer core flux walking.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: September 8, 2015
    Assignee: Lear Corporation
    Inventors: Krzysztof Klesyk, George Kaminski
  • Patent number: 9106078
    Abstract: A method is disclosed of controlling the operation of a system for providing electrical power to one or more electrical devices, the system comprising an adjustable power source root node and a plurality of adjustable power source remote nodes located remotely from the root node.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: August 11, 2015
    Assignee: UTILIDATA, INC.
    Inventor: David Gordon Bell
  • Patent number: 9088212
    Abstract: A push-pull converter configured to convert an input voltage to an output voltage according to a transfer ratio is provided. The push-pull converter comprises a transformer, a first and a second switch transistor arranged to operatively provide the input voltage to the transformer such that the transfer ratio is obtainable, a first and a second rectification transistor arranged to operatively receive a first and a second part, respectively, of the output voltage from the transformer such that the transfer ratio is obtainable. The push-pull converter is further configured to synchronously operate the first switch transistor and the first rectification transistor, synchronously operate the second switch transistor and the second rectification transistor, and operate the first and second switch transistors 180 degrees out of phase with respect to each other.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: July 21, 2015
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Mikael Appelberg
  • Patent number: 9083189
    Abstract: A device (3) and a method for equalizing the voltage of an energy-storage element (4) are provided herein. The device (3) comprises at least one transformer (36) and at least one bi-directional DC/AC converter circuit (35). Each transformer (36) comprises at least one equalizing winding (30) and at least one transforming winding (26,27). The DC terminals of each DC/AC converter circuit (35) is adapted to connect to a positive terminal (41) and a negative terminal (42) of the energy-storage element (4), and the AC terminals thereoft is connected with the transforming winding (26,27) of the transformer (36).
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: July 14, 2015
    Assignee: SHENZHEN QIANGNENG ELECTRIC CO. LTD.
    Inventor: Chuangshe Wang
  • Patent number: 9059634
    Abstract: There is provided an electronic sine wave transformer circuit configuration for transferring power from a source to a load using magnetic storage coupling, the circuit comprising: an input node adapted to receive an input alternating current power source having an input voltage operating at an input frequency in a Hertz range; the magnetic storage coupling unit comprising: a first set of windings coupled to a first switch, the first switch for receiving an input charging current associated with the input voltage; a second set of windings located in series or opposing connection with the first set of windings with a common magnetic path; a second switch connected at one end between the first and second set of windings and at another end to a common ground, the first and second switches having a switching frequency in a kilohertz range and switching between on and off in alternating modes; and an output node connected to the second set of windings, the output node adapted to provide an output AC power having a
    Type: Grant
    Filed: March 22, 2013
    Date of Patent: June 16, 2015
    Inventor: Vito Rinaldi
  • Patent number: 8971063
    Abstract: A grid tied inverter connectable to an electricity grid, the grid tied inverter comprising a DC to DC current fed push-pull converter operable to generate a current waveform from a DC voltage source, the current waveform being substantially synchronised to the electricity grid, and a transformer having a first side connected to the DC to DC current fed converter and a second side having an output line connectable to the grid.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: March 3, 2015
    Assignee: Sony Corporation
    Inventor: Alexander Charles Knill
  • 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
  • Patent number: 8923016
    Abstract: A solar module has a solar cell which generates a DC voltage. The module has a converter for converting a DC voltage fed into its input. The module contains a semiconductor switch and a controller which drives a switching input of the semiconductor switch. The controller drives the semiconductor switch variably so that the semiconductor switch switches more slowly during the transition operation than during normal operation, thereby reducing a dynamic overvoltage on the switch such that the voltage present on the switch does not exceed the blocking voltage of the switch.
    Type: Grant
    Filed: June 7, 2012
    Date of Patent: December 30, 2014
    Inventors: Rainer Weiss, Peter Beckedahl, Ingo Staudt
  • Patent number: 8903263
    Abstract: A power supply device includes, for example, a switching element, a rectifying circuit having a first rectifying element, and a control circuit which controls an output of the rectifying circuit. In particular, the power supply device includes a detection unit which detects a current flowing through the first rectifying element, and an output reduction unit which reduces the output of the rectifying circuit as an output of the switching power supply device. The output reduction unit changes a switching state of the switching element when the detection result of the detection unit exceeds a predetermined value.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: December 2, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shinichiro Matsumoto
  • Publication number: 20140340947
    Abstract: A power supply device (10) includes a plurality of constant current output circuits (14) that can supply power to a load (12). The constant current output circuit includes a pulse generation unit (20), and a PI feedback control unit (30) that performs feedback control on the pulse voltage output from the pulse generation unit. When an abnormality occurs in the constant current output circuit that supplies power to the load and the constant current output circuit that supplies power to the load is switched, a cycle of the feedback control, which is performed for the pulse generation unit of the constant current output circuit corresponding to a switching destination, is changed to a second cycle higher than a first cycle in the constant current output circuit that is not yet switched.
    Type: Application
    Filed: December 25, 2012
    Publication date: November 20, 2014
    Inventors: Hideaki Emoto, Mitsuyuki Shirae
  • 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: 8855558
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: October 7, 2014
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8831513
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: September 9, 2014
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • 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: 8804382
    Abstract: A circuit includes a first control output adapted to couple to a control terminal of a first transistor and a second control output adapted to couple to a control terminal of a second transistor. The circuit further includes a feedback input for receiving a signal and a control circuit. The control circuit is configured to independently control first and second on-times of control signals applied to the first and second control outputs, respectively, in response to receiving the signal to limit a current at an output node.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: August 12, 2014
    Assignee: Semiconductor Components Industries, LLC
    Inventors: John D. Stone, Jefferson W. Hall
  • 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: 8742691
    Abstract: A main transformer is arranged such that a load is connected to its secondary winding side. A first error amplifier generates a feedback signal that corresponds to the difference between a detection signal which indicates the electrical state of the load and a predetermined first reference voltage. A current generating resistor is arranged between a current generating transistor and a fixed voltage terminal. A second error amplifier is arranged such that the first input terminal receives the electric potential at a node that connects the current generating transistor and the current generating resistor, a predetermined second reference voltage is input to the second input terminal thereof, and the output terminal thereof is connected to the control terminal of the current generating transistor. An adjustment resistor is arranged between the output terminal of the first error amplifier and a node that connects the current generating transistor and the current generating resistor.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: June 3, 2014
    Assignee: Rohm Co., Ltd.
    Inventor: Yoshinori Imanaka
  • 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
  • Patent number: 8654546
    Abstract: A control circuit of a resonant power converter is disclosed. The control circuit comprises a first transistor and a second transistor for switching a transformer and a resonant tank comprising a capacitor and an inductor. A controller is configured to receive a feedback signal correlated to the output of the power converter for generating a first switching signal and a second switching signal to drive the first transistor and the second transistor, respectively. A diode coupled to the first transistor and the resonant tank for detecting the state of the first transistor and generating a detection signal for the controller. The detection signal indicates if the transistors are in a zero voltage switching (ZVS) state. If the transistors are not in the ZVS state, the switching frequency of the transistors will be increased.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: February 18, 2014
    Assignee: System General Corp.
    Inventors: Tien-Chi Lin, Hang-Seok Choi, Ta-Yung Yang
  • Patent number: 8634214
    Abstract: A current resonance power supply includes a transformer having a primary winding and a secondary winding, two switching elements connected to one end of the primary winding of the transformer and arranged in series, a resonance capacitor connected to the other end of the primary winding, and a voltage detection unit connected between the one end of the primary winding and the two switching elements and configured to detect that AC voltage input to a primary side of the transformer becomes lower, wherein operations of the switching elements are controlled based on a detection result of the voltage detection unit.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: January 21, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Keisuke Samejima
  • Patent number: 8625310
    Abstract: A power supply apparatus includes an AC-DC rectifier, a transformer, a feedback inductor, a resonant unit, and a primary and auxiliary switch. The AC-DC rectifier rectifies an input voltage. The transformer includes a primary coil having a first primary coil and an isolated second primary coil, and transforms a first voltage of the primary coil into a second voltage of the secondary coil. The feedback inductor is connected to a tap between the first primary coil and second primary coil and an output of the AC-DC rectifier. The resonance unit is connected in parallel with the secondary coil and is configured to output an output voltage by rectifying the second voltage provided from the secondary coil. The primary switch and secondary switch are connected in parallel between the transformer and AC-DC rectifier.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: January 7, 2014
    Assignee: Samsung Display Co., Ltd.
    Inventor: Hyeon-Yong Jang
  • Patent number: 8593835
    Abstract: The present invention relates to an oscillator that is capable of realizing duty balancing. The oscillator determines a switching frequency of a converter converting an input voltage according to a switching operation of switches to generate an output voltage. The oscillator determines a first half cycle of a duty signal determining the switching frequency by using a reference current according to a feedback signal corresponding to the output voltage. The oscillator senses a first half cycle period by using an output of the frequency setting unit, and determines the same period as the first half cycle as a second half cycle of the duty signal after the first half cycle.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: November 26, 2013
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Hyun-Chul Eom, Sung-Yun Park
  • Patent number: 8593836
    Abstract: A power converter includes a main switch to which a capacitor is connected through a sub-diode. A series connection of a primary coil of a transformer and a sub-switch is connected parallel to the capacitor. A main diode is coupled in series with the main switch. A series connection of a sub-diode and a secondary coil of the transformer is parallel to the main diode. The rate of a rise in voltage across the main switch when turned off is suppressed by the rate of charging of the capacitor. Subsequently, by turning on the sub-switch, the current flowing through the main diode to be delivered to the transformer, thereby causing the current flowing through the main switch when turned on to be decreased by the sub-inductor.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: November 26, 2013
    Assignee: Denso Corporation
    Inventor: Kazuhiro Umetani
  • Patent number: 8467204
    Abstract: A high voltage power supply is provided. The high voltage power supply includes an inverter which converts a DC voltage input to the high voltage power supply into a first AC voltage, a transformer including an input winding unit and a plurality of output winding units, wherein the input winding unit receives the first AC voltage from the inverter and the plurality of output winding units generates and outputs a second AC voltage, and a voltage multiplier unit which boosts the second AC voltage output by the transformer and outputs a boosted voltage, and the voltage multiplier unit includes a plurality of voltage multipliers which are connected to each other in series and the plurality of voltage multipliers may be connected to the plurality of output winding units respectively.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: June 18, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Pankaj Agarwal, Kang-hyun Yi, Sung-jin Choi, Joon-hyun Yang
  • Patent number: 8466663
    Abstract: According to prior art, a clock frequency increase for clocked high-frequency integrated circuits, in particular microprocessors, reaches a current physical limit of approximately 3 GHz, as dynamic current modifications cannot be sufficiently compensated. The aim of the invention is to provide a power supply for electronic systems with a double-figure GHz range. To permit the rapid compensation of dynamic current modifications, the current compensation circuit (10) is placed in the vicinity of the integrated circuit (11) or is integrated into the latter. A control amplifier (8) influences a pulsewidth modulator (2) by means of an optical coupler (9). Said pulsewidth modulator control controls a normal mode voltage converter (3, 4) with synchronous rectification (5). A specific application area for the invention is the supply of future high-performance microprocessors, whose development has been delayed by the aforementioned power problem.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: June 18, 2013
    Assignee: MK-Elektronik-GmbH
    Inventor: Michael Kaufmann
  • Publication number: 20130063982
    Abstract: An embodiment apparatus comprises a secondary synchronous rectifier and a secondary gate drive controller. The secondary gate drive controller coupled to a transformer winding comprises a secondary synchronous rectifier soft start signal generator configured to generate a plurality of soft start pulses, a pulse width modulation generator configured to generate a forward switch drive signal and a freewheeling switch drive signal based upon a signal across the transformer winding and a soft transition generator configured to generate a soft start freewheeling switch drive signal by gradually releasing the freewheeling switch drive signal during a soft start process.
    Type: Application
    Filed: October 24, 2011
    Publication date: March 14, 2013
    Applicant: FutureWei Technologies, Inc.
    Inventors: Liming Ye, Hengchun Mao, Xunjun Liu
  • Publication number: 20130010503
    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: Application
    Filed: April 16, 2012
    Publication date: January 10, 2013
    Inventor: Hangseok Choi
  • Patent number: 8351856
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: January 8, 2013
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8346167
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: January 1, 2013
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8346166
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: January 1, 2013
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8339817
    Abstract: A method of operating a resonant power converter(1, 2), having a high side switch(3) and a low side switch(4), is disclosed in which the switching is controlled to allow for improved operation at low power levels. The method involved an interruption to the part of the switching cycle in which the low side switch (4) is normally closed, by opening the switch at a particular moment in the cycle which allows the energy to be store in the resonance capacitor (5). Since, as a result, the energy is largely not resonating but stored in a single component, the time quantization of the mode of operation is significantly reduced or eliminated.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: December 25, 2012
    Assignee: NXP B.V.
    Inventor: Hans Halberstadt
  • Patent number: 8331113
    Abstract: The invention discloses a control circuit for an AC-DC converter. The control circuit includes a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, in which the frequency modulation control signal is used to control the output power of the AC-DC converter and suppress harmonics of the input current, and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, in which the frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing harmonics of the input current and regulating the switching frequency the AC-DC converter, and regulating the output power of the AC-DC converter.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: December 11, 2012
    Assignee: Delta Electronics, Inc.
    Inventors: Pak-Chuen Tang, Kwong-Ming Ching, Chung-Hei Poon
  • Patent number: 8315561
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: November 20, 2012
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8301079
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: October 30, 2012
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 8301080
    Abstract: An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating characteristics based upon information received from the remote device. Further, the ballast may provide a path for the remote device to communicate with device other than the adaptive inductive ballast.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: October 30, 2012
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman