Zero Switching Patents (Class 323/235)
  • Patent number: 10362656
    Abstract: A load control device for controlling power delivered from an alternating-current power source to an electrical load may comprise a controllably conductive device, a control circuit, and an overcurrent protection circuit that is configured to be disabled when the controllably conductive device is non-conductive. The control circuit may be configured to control the controllably conductive device to be non-conductive at the beginning of each half-cycle of the AC power source and to render the controllably conductive device conductive at a firing time during each half-cycle (e.g., using a forward phase-control dimming technique). The overcurrent protection circuit may be configured to render the controllably conductive device non-conductive in the event of an overcurrent condition in the controllably conductive device.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: July 23, 2019
    Assignee: Lutron Technology Company LLC
    Inventors: Dinesh Sundara Moorthy, James P. Steiner
  • Patent number: 10348182
    Abstract: A switching converter with quasi-resonant control having a switch and an energy storage component, comprising a peak current regulating circuit configured to provide a peak current regulating signal to regulate a peak current signal or a current sense signal, wherein the peak current regulating signal is adjusted when non-CCM (Current Continuous Mode) and non-valley-switching are detected.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: July 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Siran Wang
  • Patent number: 10234890
    Abstract: A load control device may control the amount of power provided to an electrical load utilizing a phase control signal that operates in a reverse phase control mode, a center phase control mode, and a forward phase control mode. A load control device may be configured to determine that the electrical load should be operated via a phase control signal operating in a forward phase-control mode. After determining to operate the electrical load via the phase control signal in the forward phase-control mode, the load control device may provide the phase control signal in a reverse phase-control mode for a predetermined period of time to the electrical load, for example, to charge a bus capacitor of the electrical load. Subsequently, the load control device may be configured to switch the phase control signal to the forward phase-control mode and provide the phase control signal in the forward phase-control mode to the electrical load.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: March 19, 2019
    Assignee: Lutron Electronics Co., Inc.
    Inventors: Robert C. Newman, Jr., Christopher J. Salvestrini
  • Patent number: 10222847
    Abstract: There is provided a semiconductor device that can follow a fast voltage change such as a large voltage drop occurring at the time of rapid load fluctuation. The semiconductor device includes a voltage sensor which monitors a power supply voltage at a sampling speed higher than the assumed frequency of power supply voltage fluctuation and outputs a voltage code value, a voltage drop determination circuit which determines, from the voltage code value, that a voltage drop causing a malfunction of a system occurs, and outputs a clock stop signal, and a clock control circuit which controls clock stop, restart, and frequency change.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: March 5, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Yuko Kitaji, Kazuki Fukuoka, Ryo Mori, Toshifumi Uemura
  • Patent number: 10211828
    Abstract: A driving device includes: a driving circuit operating with a single power supply in accordance with a driving signal; a first parallel circuit formed of a first capacitor and a first zener diode connected together in parallel, and having a first end connected to an output terminal of the driving circuit; a series circuit connected between a second end of the first parallel circuit and a ground of the driving circuit, and formed of a diode and a second parallel circuit (of a second capacitor and a second zener diode) connected to each other in series; and a resistor is connected between the second end of the first parallel circuit and the ground of the driving circuit. A voltage across the resistor is used as an output voltage for driving the insulated gate semiconductor element. A voltage across the first capacitor is superimposed negative-wise on the output voltage.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: February 19, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Takaaki Gyoten
  • Patent number: 10180711
    Abstract: There is provided a semiconductor device that can follow a fast voltage change such as a large voltage drop occurring at the time of rapid load fluctuation. The semiconductor device includes a voltage sensor which monitors a power supply voltage at a sampling speed higher than the assumed frequency of power supply voltage fluctuation and outputs a voltage code value, a voltage drop determination circuit which determines, from the voltage code value, that a voltage drop causing a malfunction of a system occurs, and outputs a clock stop signal, and a clock control circuit which controls clock stop, restart, and frequency change.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: January 15, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Yuko Kitaji, Kazuki Fukuoka, Ryo Mori, Toshifumi Uemura
  • Patent number: 10177670
    Abstract: A flyback power converter circuit includes: a transformer including a primary winding coupled to an input power and a secondary winding coupled to an output node, a primary side switch controlling the primary side winding to convert the input power to an output power on the output node through the secondary side winding, a clamping circuit including an auxiliary switch and an auxiliary capacitor connected in series to form an auxiliary branch which is connected with the primary side winding in parallel, and a conversion control circuit for adjusting an auxiliary ON time of the auxiliary switch during an OFF time of the primary side switch according to an estimated parasitic diode conduction time of a parasitic diode of the auxiliary switch; the auxiliary ON time is controlled to be substantially equal to and coincides with the estimated parasitic diode conduction time.
    Type: Grant
    Filed: April 28, 2018
    Date of Patent: January 8, 2019
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Tzu-Chen Lin, Kun-Yu Lin
  • Patent number: 10177651
    Abstract: A system for eliminating inrush current to electrical equipment while providing a user increased control is proposed. The user of the device is able to control the speed of the ramp up of alternating current (AC) to the electrical equipment, regardless of the load. When the ramp up meets its full power, the device of the present system will disable itself while allowing power to flow directly to the electrical equipment. The present system allows for user controlled delay time as well as microcontroller controlled current sensing. Further, the device shuts off power to the electrical equipment if an overdraw of current (e.g. a short circuit in an amplifier) is detected. This feature may be an early warning, indicating a need for technical repair before irrevocable damage is done to the components of the electrical equipment.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: January 8, 2019
    Assignee: MERCURY MAGNETICS, INC.
    Inventor: Sergio H. Hamernik
  • Patent number: 10033265
    Abstract: The switching element is turned ON and OFF according to when the current flowing through the inductance element becomes equal to zero and according to an amplified error voltage between the output voltage and a target output voltage. More particularly, the OFF time of the switching element is calculated, and when the OFF time is less than a prescribed value, the ON time of the switching element is increased. Moreover, the amount by which the ON time of the switching element is increased is reduced if the error voltage if greater than a prescribed value.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: July 24, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Takato Sugawara
  • Patent number: 10002699
    Abstract: The present invention is to provide a magnet coil drive control device that can efficiently suppress conduction noise while reducing the capacitance of a capacitor. A capacitor and an impedance element are arranged in series on the connecting line connecting the positive electrode line and the negative electrode line of a DC power supply, the connecting line between the capacitor and the impedance element is connected to one end of a magnet coil via a freewheeling diode, and the portion between the freewheeling diode and the one end of the magnet coil is connected to the positive electrode line or the negative electrode line by a switching element. Conduction noise caused by the driving current of the magnet coil can be suppressed by the impedance element, and the capacitance of the capacitor can be further reduced. Accordingly, the magnet coil drive control device can be made smaller in size.
    Type: Grant
    Filed: April 25, 2013
    Date of Patent: June 19, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kiyoshi Aiki, Ayumu Hatanaka, Takuya Mayuzumi, Katsuya Oyama, Ryosuke Ishida, Yasushi Sugiyama
  • Patent number: 9960615
    Abstract: An electronic device and method and power supply are disclosed. The electronic device includes comprising a connector for electrically coupling with an external power supply unit, and a processor. The processor implements the method, which includes detecting a connection state with the external power supply unit, and detecting whether power supplied from the external power supply unit is abnormal, and controlling the power when the power supplied has an abnormal value. The power supply may include a connector for electrically coupling with an electronic device, and a processor for detecting a connection state with the electronic device, detecting whether power supplied to the electronic device by the power supply unit has an abnormal value, and controlling the supplied power when the power is abnormal.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: May 1, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Geun Yoon, Ju-Nyun Kim, Se-Won Oh, Kisun Lee, Ku-Chul Jung
  • Patent number: 9954432
    Abstract: A power supply apparatus with soft-start function is suitable to a load including a voltage stabilizing unit and a load unit coupled in parallel. The power supply apparatus includes a power unit, a soft-start adjusting unit, a current detecting unit and a controlling unit. The power unit generates a power voltage. The soft-start adjusting unit receives the power voltage, a first controlling signal and a second controlling signal, and transforms the power voltage to a soft-start current accordingly to output the soft-start current to the voltage stabilizing unit or output the power voltage to the voltage stabilizing unit. The current detecting unit measures a current of a loop formed between the power unit and the voltage stabilizing unit to generate a current detecting signal. The controlling unit receives the current detecting signal to generate the first controlling signal and second controlling signal.
    Type: Grant
    Filed: July 2, 2017
    Date of Patent: April 24, 2018
    Assignees: HAN-WIN TECHNOLOGY CO. LTD.
    Inventor: Han-Jung Kao
  • Patent number: 9954439
    Abstract: A control circuit of a switching power-supply device that converts a first DC voltage supplied from an input power source to a second DC voltage, includes: a first A/D converter that converts the second DC voltage into a first digital value, in response to a sampling clock depending on a first sampling clock and a second sampling clock; a control signal generation unit that generates a control signal for controlling on-and-off of the switching element based on of a difference between the first digital value and a target value; a regeneration completion sensing unit that senses completion of regeneration of the inductor and outputs a regeneration completion signal; and a sampling clock generation unit that: generates the first sampling clock, in response to the control signal to turn on the switching element, and generates the second sampling clock, in response to the regeneration completion signal.
    Type: Grant
    Filed: October 23, 2016
    Date of Patent: April 24, 2018
    Assignee: Sanken Electric Co., LTD.
    Inventor: Masaru Nakamura
  • Patent number: 9927829
    Abstract: A load control device may control the amount of power provided to an electrical load utilizing a phase control signal that operates in a reverse phase control mode, a center phase control mode, and a forward phase control mode. A load control device may be configured to determine that the electrical load should be operated via a phase control signal operating in a forward phase-control mode. After determining to operate the electrical load via the phase control signal in the forward phase-control mode, the load control device may provide the phase control signal in a reverse phase-control mode for a predetermined period of time to the electrical load, for example, to charge a bus capacitor of the electrical load. Subsequently, the load control device may be configured to switch the phase control signal to the forward phase-control mode and provide the phase control signal in the forward phase-control mode to the electrical load.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: March 27, 2018
    Assignee: LUTRON ELECTRONICS CO., INC.
    Inventors: Donald F. Hausman, Jr., Robert C. Newman, Jr., Christopher J. Salvestrini
  • Patent number: 9872349
    Abstract: A phase-cut dimming control system according to the embodiment includes a phase angle detector configured to detect a phase angle of an input voltage generated by phase-cut dimming, a feedback signal generator configured to generate a first reference signal corresponding to the detected phase angle, and generate an initial feedback signal based on a detection signal corresponding to power supplied to a load and the first reference signal, a feedback signal modulator configured to modulate the initial feedback signal and generate a feedback signal, a power transmission controller configured to generate a control signal which controls power transmission according to the feedback signal, and a power transmission circuit configured to transmit power to the load according to the control signal.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: January 16, 2018
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Hyunchul Eum, Youngjong Kim, Kuo-Hsien Huang, Chih-Chun Chuang, Young Mo Yang, Young Je Lee, Moon Ho Choi, Moon Sik Song
  • Patent number: 9847721
    Abstract: A voltage converter includes a switching driver, a controller, a low-pass filter and a pulse width modulation signal generator. The switching driver includes a pull-up switching circuit connecting an input voltage to a switching node in response to a pull-up signal and a pull-down switching circuit connecting a ground voltage to the switching node in response to a pull-down signal. The controller generates the pull-up signal and the pull-down signal in response to a pulse width modulation signal and measures pull-up and pull-down turn-on times of the pull-up and pull-down switching circuits in real time to control a dead time. The low-pass filter filters a switching voltage signal on the switching node to generate an output voltage. The pulse width modulation signal generator generates the pulse width modulation signal based on a reference signal and the output voltage.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: December 19, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Je-Kook Kim
  • Patent number: 9843270
    Abstract: A multilevel rectifier includes an input lead, a switching module, and a multilevel direct current (DC) link. The switching module includes a plurality of switch devices connected to the input lead. The multilevel DC link includes a positive lead, a midpoint lead, and a negative lead. each connected to the switching module. The plurality of switching module switch devices are operatively connected between the input lead and the DC link to provide a greater number of output voltage levels than the number of leads in the DC link with unidirectional power flow capability.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: December 12, 2017
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Suman Dwari
  • Patent number: 9831793
    Abstract: A control apparatus configured to control a chain link voltage source converter, the control apparatus comprising; two converter controllers, each converter controller configured to receive a measure of the output voltage and/or current from the converter and determine a control signal therefrom for controlling the voltage source converter, each converter controller including at least one integrator element configured to perform an integration operation and output an integrator term in said determination of the control signal, a selector configured to select which one of the converter controllers provides its control signal to the converter; wherein each integrator element is configured to have two modes, a first mode in which the integrator element determines the integrator term and a second mode in which the integrator term is provided by a corresponding integrator element in the other converter controller.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: November 28, 2017
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventor: Colin Donald Murray Oates
  • Patent number: 9800162
    Abstract: A power control system is electrically connected to a power function circuit including a power circuit, a coil module, a switch, and a load circuit, and includes at least one timer, a zero-current trigger unit, a status control unit, and a driver unit. The status control unit has a first status interval, a second status interval, a third status interval and a fourth status. The power control method triggers the status control unit to change the status interval when a counting time reaches one specific time interval corresponding one status interval. When a coil voltage of the coil module drops to zero from a voltage larger than a positive threshold voltage in the third status interval or the fourth status interval, the status control unit triggers to change the status interval, re-enters the first status interval, resets the timer, and triggers the driver unit to open the switch.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: October 24, 2017
    Assignee: Joint Power Exponent, Ltd.
    Inventors: Yuan Kuan, Jyh-Ting Lai
  • Patent number: 9787360
    Abstract: An alternating current (AC) zero-crossing indicator apparatus including a current adjusting circuit for adjusting a DC signal current for a duration of time the same as the duration of a received zero-crossing detection signal. The zero-crossing indicator apparatus additionally includes a voltage retainer for maintaining a constant DC voltage applied to a connected load during the adjusting of the DC signal current. Also included is a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of the DC signal current.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: October 10, 2017
    Assignee: Sigma Designs Israel S.D.I. Ltd.
    Inventors: Danny Braunshtein, Alex Akselrod
  • Patent number: 9748861
    Abstract: A method for operating an N-level K-phase electrical power converter, wherein N is greater than or equal to 3 and K is greater than or equal to 1. The method includes: providing a plurality of N connection points that each correspond to a definable potential, wherein a first connection point corresponds to a first potential, a second connection point corresponds to a second potential, and at least one further connection point corresponds to a further potential which is lower than the first and greater than the second potential; providing a plurality of K output connections that are each selectively connected to a respective one of the connection points via at least one switching device; and having at least one current flowing into the at least one further connection point.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: August 29, 2017
    Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LTD
    Inventors: Martin Janssen, Niels Weitendorf
  • Patent number: 9709936
    Abstract: A system and method for controlling the fuser heater of an electrophotographic imaging device, including determining an initial temperature of the fuser heater; calculating a plurality of warm-up times for heating the fuser heater to a first predetermined temperature based on the initial temperature and a plurality of previously determined warm-up times taken over a plurality of line voltages and stored in memory of the electrophotographic device; determining an actual warm-up time for heating the fuser to the first predetermined temperature; selecting a first calculated warm-up time and a second calculated warm-up time from the plurality of calculated warm-up times; determining a first line voltage value and a second line voltage value corresponding to the first and second warm-up times, respectively, and calculating a current line voltage based on the actual warm-up time, the first and second calculated warm-up times, and the first and second line voltage values.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: July 18, 2017
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Steve Brennen Ball, Jichang Cao, Christopher Edward Rhoads
  • Patent number: 9712050
    Abstract: A power converter is disclosed. The power converter includes a resonant half-bridge having a first power switch and a second power switch for driving a resonant circuit of the resonant half-bridge. The power converter further includes a charge pump coupled to the resonant half-bridge, where the charge pump is configured to selectively provide a positive current from the resonant circuit to an output stage of the power converter, and to selectively shunt to ground a negative current from the resonant circuit, based on an output stage feedback signal. In one implementation, the resonant circuit includes a series L-C circuit. The power converter is configured to provide a constant output current and/or a constant output voltage.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: July 18, 2017
    Assignee: Infineon Technologies Americas Corp.
    Inventor: Thomas J. Ribarich
  • Patent number: 9705423
    Abstract: The subject matter of this specification can be embodied in, among other things, a phase circuit having an output port, and a high side circuit having a first input port, a high side switching device configured to receive power from a high side power bus and switch power to the output port based on a first input signal received at the first input port, a voltage regulating device having a regulator input port, and a bootstrap capacitor coupled between the voltage regulating device and the output port, wherein the regulating device is configured to receive power from the high side power bus and controllably supply power to the bootstrap capacitor based on a regulator input voltage received at the regulator input port, the regulator input voltage based on a voltage difference between a voltage present on the output port and a voltage present on the high side power bus.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: July 11, 2017
    Assignee: Woodward, Inc.
    Inventor: Dragan Micic
  • Patent number: 9686840
    Abstract: A multi-mode control device is provided for controlling a load device. A high-power interface of the control device can be electrically coupled to a high-power module. An occupancy sensor can receive a first current from the high-power module via the high-power interface, and a trigger detection device can receive a second current that is less than the first current from a low-power module via a low-power interface. The processor can switch the control device from a high-power mode for powering the occupancy sensor to a low-power mode by causing a reduction in the current provided to the occupancy sensor and causing current to be provided to the trigger detection device. The trigger detection device can detect a trigger in the low-power mode. The processor can cause the control device to operate in the high-power mode based on the trigger's detection.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: June 20, 2017
    Assignee: ABL IP Holding LLC
    Inventors: Stephen Haight Lydecker, Glen Andrew Kruse, Richard L. Westrick, Jr., Ryan Alexis Zaveruha
  • Patent number: 9680383
    Abstract: A controller for use in a power converter includes a state selection circuit coupled to receive an input voltage sense signal representative of an input voltage, a switch current sense signal representative of a switch current of a power switch, and a feedback signal representative of an output quantity of the power converter. The state selection circuit is coupled to generate an input voltage signal in response to the input voltage sense signal, an input current signal in response to the switch current sense signal, and an input threshold signal in response to the feedback signal. A state machine circuit is coupled to the state selection circuit to generate a drive signal in response to the input voltage signal, the input current signal, and the input threshold signal to switch the power switch to control a transfer of energy from an input to an output of the power converter.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: June 13, 2017
    Assignee: Power Integrations, Inc.
    Inventors: Mingming Mao, Ricardo Luis Janezic Pregitzer, Michael Yue Zhang, Tiziano Pastore
  • Patent number: 9674933
    Abstract: A two-wire lighting control device, may include a controllably conductive device, a signal generation circuit, and a filter circuit. The controllably conductive device may apply an AC line voltage to a load, being conductive for a first duration of time and non-conductive for a second duration of time within a half-cycle of the AC line voltage. The signal generation circuit may generate a non-zero-magnitude signal. And, the filter circuit may receive a signal from the controllably conductive device during the first duration of time and the non-zero-magnitude signal from the signal generation circuit during the second duration of time. The non-zero-magnitude signal may, in effect, fill-in or complement the signal from the controllably conductive device, and any delay variation as a function of the firing angle of the controllably conductive device through the filter circuit may be mitigated by the presence of the non-zero-magnitude signal.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: June 6, 2017
    Assignee: LUTRON ELECTRONICS CO., INC.
    Inventors: William Zotter, Bingrui Yang, Henry Kite
  • Patent number: 9673707
    Abstract: Apparatus and methods for bypassing an inductor of a voltage converter are provided. In one embodiment, a voltage converter includes an inductor and a bypass circuit that selectively bypasses the inductor based on a state of a bypass control signal. The inductor includes including a first end electrically connected to a first node and a second end electrically connected to a second node. The bypass circuit includes a first p-type field effect transistor and a second p-type field effect transistor electrically connected in series between the first node and the second node. The first p-type field effect transistor includes a body electrically connected to a first voltage, and the second p-type field effect transistor includes a body electrically connected to a second voltage greater than the first voltage.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: June 6, 2017
    Assignees: SKYWORKS SOLUTIONS, INC., SNAPTRACK, INC.
    Inventors: Peter Harris Robert Popplewell, Jakub F. Pingot, Florinel G. Balteanu, Martin Wilson, Mark Tuckwell
  • Patent number: 9667157
    Abstract: A power converter includes a first bus converter for converting a first direct current (DC) bus voltage into a first high frequency alternating current (AC) voltage and a second bus converter for converting a second high frequency AC voltage into a second DC bus voltage. A resonant circuit couples the first bus converter and the second bus converter. Further, a controller provides switching signals to the first bus converter and the second bus converter to operate the power converter in a soft switching mode. The controller includes a voltage detection circuit connected across at least one switching device of the power converter to detect a device voltage across the at least one switching device and a counter to count a number of hard switching detection pulses of the hard switching pulse signal detector.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: May 30, 2017
    Assignee: General Electric Company
    Inventors: Dong Dong, Luis Jose Garces, Mohammed Agamy, Ravisekhar Nadimpalli Raju, Yan Pan
  • Patent number: 9564806
    Abstract: An apparatus, e.g., a boost converter, includes a first switch configured to be coupled to an inductor and to support a charging current in the inductor from a power source and at least two serially-coupled second switches coupled in parallel with the first switch and configured to selectively route current from the inductor to at least two serially-connected capacitors. The apparatus may further include a control circuit configured to operate the first switch and the plurality of second switches.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: February 7, 2017
    Assignee: Cree, Inc.
    Inventors: Binod Kumar Agrawal, Narasimha Reddy Bommireddy
  • Patent number: 9531274
    Abstract: A resonant converter, a power supply and a power controlling method thereof are provided. The power supply includes a resonant converter which includes a square wave generator configured to alternately turn on and off first and second switches according to a frequency to generate a square wave, a resonant wave generator configured to generate a resonant wave corresponding to the square wave and a rectifier configured to output a voltage corresponding to the resonant wave; and a controller configured to control a frequency modulation of the resonant converter, wherein the controller includes a variable switching circuit configured to increase the frequency of the resonant converter in response to the resonant converter entering a capacitive mode.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: December 27, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Won-myung Woo, Jin-hyung Lee, Gil-yong Chang
  • Patent number: 9497807
    Abstract: In one embodiment, a dimmer circuit is coupled to an electronic load and receives an alternating current (AC) signal. A phase control circuit turns the dimmer circuit on for a first portion of the AC signal to turn on the electronic load. The dimmer circuit turns off during a second portion of the AC signal to turn off the electronic load. A switch is coupled to the phase control circuit. The switch is controlled to couple the phase control circuit to ground when the dimmer circuit is off where the switch is part of a power supply supplying power to the electronic load.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: November 15, 2016
    Assignee: Marvell World Trade Ltd.
    Inventors: Radu Pitigoi-Aron, Wanfeng Zhang, Jinho Choi
  • Patent number: 9431908
    Abstract: A DC-DC converter includes a zero current detector. The DC-DC converter includes a high-side switch and a low-side switch. When the DC-DC converter works in a discontinuous conduction mode (DCM). The zero current detector detects a zero current a detection node which is arranged between the high-side switch and the low-side switch generates the zero current, the zero current detector outputs the control signal to a driver. The driver switches the high-side switch and the low-side switch off simultaneously according to the control signal.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: August 30, 2016
    Assignee: Fitipower Integrated Technology, Inc.
    Inventors: Chio-Yi Ho, Wen-Yen Lee, Yi-Sheng Liu
  • Patent number: 9407154
    Abstract: An electrical circuit for providing electrical power for use in powering electronic devices is described herein. The electrical circuit includes a power converter circuit that is electrically coupled to an electrical power source for receiving alternating current (AC) input power from the electrical source and delivering direct current (DC) output power to an electronic device. The power converter circuit includes a transformer and a switching device coupled to a primary side of the transformer for delivering power from the electrical power source to a primary side of the transformer. A controller is coupled to a voltage sensor and the switching device for receiving the sensed voltage level from the voltage sensor and transmitting a control signal to the switching device to adjust the voltage level of power being delivered to the electronic device.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: August 2, 2016
    Assignee: ADVANCED CHARGING TECHNOLOGIES, LLC
    Inventors: Michael H. Freeman, Robert Dieter, Mitchael C. Freeman, Sateesh Pillai, Daniel Segarra
  • Patent number: 9362842
    Abstract: A control circuit varies the power of a load powered by an alternating voltage, comprising: a first thyristor and a first diode connected in antiparallel between first and second nodes, the cathode of the first diode being on the side of the first node; a second thyristor and a second diode connected in antiparallel between the second node and a third node, the cathode of the second diode being on the side of the third node; third and fourth diodes connected in antiseries between the first and third nodes, the cathodes of the third and fourth diodes being connected to a fourth node; a transistor between the second and fourth nodes; and a control unit for controlling the first and second thyristors and the transistor.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: June 7, 2016
    Assignee: STMicroelectronics (Tours) SAS
    Inventors: Benoit Renard, Laurent Gonthier
  • Patent number: 9240728
    Abstract: A control device detects zero crossings of a current through a rectifier transistor during plural cycles; generates a turn-on signal of the transistor and inserts a turn-on delay equal to a fixed first quantity from the start time of for each cycle. The control device starts counting consecutive cycles after inserting the turn-on delay; detects whether a zero crossing of the current through the transistor after turning on said transistor has occurred; if no zero crossing is detected before counting a number N of consecutive cycles, decreases the turn-on delay by a fixed second quantity for the next cycle; if a zero crossing is detected, maintains turned on the transistor; if the turn-on delay is smaller than first quantity, increases the turn-on delay o for the next switching cycle; and if the turn-on delay is equal to the first quantity, maintains the turn-on delay for the next switching cycle.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: January 19, 2016
    Assignee: STMicroelectronics S.r.l.
    Inventors: Alberto Iorio, Maurizio Foresta, Alberto Bianco
  • Patent number: 9160159
    Abstract: An embodiment of an apparatus, such as a circuit breaker, includes an input node, an output node, and a digital circuit. The input node is configured to receive an input voltage, and the output node is coupled to the input node and is configured to carry an output current. And the digital circuit is configured to uncouple the output node from the input node in response to a power drawn from the input node exceeding a threshold.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: October 13, 2015
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Salvatore Pantano, Marco Martini
  • Patent number: 9070507
    Abstract: Communication and charging circuitry for an implantable medical device is described having a single coil for receiving charging energy and for data telemetry. The circuitry removes from the AC side of the circuit a tuning capacitor and switch traditionally used to tune the tank circuitry to different frequencies for telemetry and charging. As such, the tank circuitry is simplified and contains no switchable components. A switch is serially connected to the storage capacitor on the DC side of the circuit. During telemetry, the switch is opened, thus disconnecting the storage capacitor from the tank circuit, and alleviating concerns that this capacitor will couple to the tank circuit and interfere with telemetry operations. During charging, the switch is closed, which allows the storage capacitor to couple to the tank circuitry through the rectifier during some portions of the tank circuitry's resonance.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: June 30, 2015
    Assignee: Boston Scientific Neuromodulation Corporation
    Inventors: Vasily Dronov, Jordi Parramon, Robert Ozawa, Md. Mizanur Rahman, Emanuel Feldman
  • Publication number: 20150137775
    Abstract: A control circuit includes an auxiliary pin for receiving an auxiliary voltage of an auxiliary winding of a power converter; a first detection unit for detecting a first time point when the auxiliary voltage begins resonance, and outputting a first detection signal according to the first time point; a second detection unit for detecting a second time point when the auxiliary voltage reaches a predetermined voltage, and outputting a second detection signal according to the second time point; a delay time controller for obtaining a delay time according to a output time difference between the first detection signal and the second detection signal, and outputting a driving signal with delay of the delay time when receiving the second detection signal; and a gate control signal generator for generating a gate control signal to a power switch of the power converter according to the driving signal of the delay time controller.
    Type: Application
    Filed: November 17, 2014
    Publication date: May 21, 2015
    Inventor: Yu-Bin Wang
  • Publication number: 20150115908
    Abstract: The present document relates to multiphase DC-DC power converters. In particular, the present document relates to the compensation of the phase offset incurred in multiphase DC-DC power converters which are controlled based on coil current zero crossing. A control circuit for a multiphase power converter is described. The multiphase power converter comprises a first and a second constituent switched-mode power converter, wherein the first and second constituent power converters provide first and second phase currents, respectively. The first and second phase currents contribute to a joint load current of the multiphase power converter. The first and second constituent power converters comprise first and second half bridges with first and second high side switches and first and second low side switches, respectively.
    Type: Application
    Filed: March 7, 2014
    Publication date: April 30, 2015
    Applicant: Dialog Semiconductor GmbH
    Inventor: Pietro Gambetta
  • Publication number: 20150115909
    Abstract: A method for providing non-resonant zero-voltage switching in a switching power converter. The switching power converter converts power from input power to output power during multiple periodic switching cycles. The switching power converter includes a main switch and an auxiliary capacitor adapted for connecting to the main switch, and an inductor connectible to the auxiliary capacitor. When the main switch is on, a previously charged (or previously discharged) auxiliary capacitor is connected to the main switch with auxiliary switches. The main switch is switched off with zero voltage while discharging non-resonantly (charging) the auxiliary capacitor by providing a current path to the inductor. The auxiliary capacitor is disconnected from the main switch. The voltage of the auxiliary capacitor is charged and discharged alternatively during subsequent switching cycles.
    Type: Application
    Filed: December 30, 2014
    Publication date: April 30, 2015
    Inventor: Tzachi Glovinski
  • Patent number: 9013156
    Abstract: A signal generation device and a signal generation method may measure leakage currents, such as an input current value I and phase-shifted current values I cos ? and I sin ? in a short period of time and automatically output the detected values without calculating a vector of a phase difference. The signal generation device generates logical signals from a voltage waveform and a current waveform of a measured power line through first and second comparators, sets parameters, full-wave rectifies the current waveform, and performs quantization transform on the full-wave rectified current waveform using a successive ??ADC.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: April 21, 2015
    Assignee: Tanashin Denki Co., Ltd.
    Inventors: Masakatsu Sawada, Kenya Matsushita
  • Publication number: 20150091536
    Abstract: A semiconductor device includes: first and second switching elements connected in series through a switching node; a pulse control unit that pulse-controls switching operations of the first and the second switching elements; an inductor that outputs an output voltage from a second end, a first end of the inductor being coupled to the switching node; a detection unit that detects that an inductor current flowing through the inductor is zero; and a first determination unit that determines that an operation mode of an external circuit to which the output voltage is supplied is a second mode when a period during which the inductor current is zero is longer than a first reference period, a power consumption in the second mode being smaller than that in a first mode.
    Type: Application
    Filed: August 22, 2014
    Publication date: April 2, 2015
    Inventor: Hideaki Tanaka
  • Publication number: 20150084605
    Abstract: A DC-DC converter includes a zero current detector. The DC-DC converter includes a high-side switch and a low-side switch. When the DC-DC converter works in a discontinuous conduction mode (DCM). The zero current detector detects a zero current a detection node which is arranged between the high-side switch and the low-side switch generates the zero current, the zero current detector outputs the control signal to a driver. The driver switches the high-side switch and the low-side switch off simultaneously according to the control signal.
    Type: Application
    Filed: September 23, 2014
    Publication date: March 26, 2015
    Inventors: CHIO-YI HO, WEN-YEN LEE, YI-SHENG LIU
  • Publication number: 20150061611
    Abstract: A power converter having a bootstrap refresh control circuit and a method for controlling the power converter. The bootstrap refresh control circuit is configured to monitor a bootstrap voltage across a bootstrap capacitor and to provide an enhanced high side driving signal to a high side switch of the power converter. The bootstrap refresh control circuit is further configured to controlling the charging of the bootstrap capacitor through regulating the on and off switching of the high side switch and a low side switch based on the bootstrap voltage. The bootstrap refresh control circuit can refresh the bootstrap voltage in time to support driving the high side switch normally, without causing large spikes in an output voltage of the power converter and without influencing the power conversion efficiency of the power converter.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 5, 2015
    Applicant: MONOLITHIC POWER SYSTEMS, INC.
    Inventor: Yike Li
  • Publication number: 20150054475
    Abstract: A signal generation device and a signal generation method may measure leakage currents, such as an input current value I and phase-shifted current values I cos ? and I sin ? in a short period of time and automatically output the detected values without calculating a vector of a phase difference. The signal generation device generates logical signals from a voltage waveform and a current waveform of a measured power line through first and second comparators, sets parameters, full-wave rectifies the current waveform, and performs quantization transform on the full-wave rectified current waveform using a successive ??ADC.
    Type: Application
    Filed: May 24, 2013
    Publication date: February 26, 2015
    Inventors: Masakatsu SAWADA, Kenya MATSUSHITA
  • Publication number: 20150002107
    Abstract: Reducing current harmonics at light loads is disclosed. In an example, a method includes increasing output voltage of a boost converter to reach a higher potential in a low power mode. After reaching the higher potential, the method includes dropping a set point for the output voltage.
    Type: Application
    Filed: January 31, 2012
    Publication date: January 1, 2015
    Inventors: Daniel Humphrey, Mohamed Amin Bemat
  • Patent number: 8917068
    Abstract: The present invention relates to a quasi-resonant controlling and driving circuit and method for a flyback converter. In one embodiment, a controlling and driving circuit for a flyback converter, can include: a differentiation circuit configured to receive a third controlling signal and a drain-source voltage of a main power switch of the flyback converter; where the drain-source voltage is configured to be differentiated by the differentiation circuit to generate a differential voltage when the third controlling signal is active within an interval that the main power switch is shut-off; a valley voltage detection circuit coupled to the differentiation circuit, and configured to receive the differential voltage; and where a valley controlling signal is configured to be generated by the valley voltage detection circuit to achieve quasi-resonant driving for the main power switch of the flyback converter when the differential voltage crosses zero with a positive slope.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: December 23, 2014
    Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd
    Inventors: Shenglun Chen, Jin Jin
  • Publication number: 20140368950
    Abstract: A switching regulator has an output stage which, with an output switch element, an inductor, a rectifying element, and a smoothing element, generates an output voltage from an input voltage, a divided voltage generator which generates a divided voltage from a switch voltage generated at one terminal of the rectifying element, a selector which outputs one of the divided voltage and a fixed voltage in accordance with a switching signal as a select voltage, a zero-cross comparator which monitors the select voltage to generate a zero-cross detection signal, and a controller which generates the switching signal in accordance with the necessity of monitoring the zero-cross of an inductor current and which performs on/off control of the output switch element reflecting the zero-cross detection signal.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Applicant: Rohm Co., Ltd.
    Inventor: Hironori Sumitomo
  • Publication number: 20140368173
    Abstract: A power conversion apparatus includes first, second, third, and fourth switching elements. In a first period, the second and third switching elements are switched ON, and first and fourth switching elements are alternately switched ON/OFF. In a second period, the first and fourth switching elements are switched ON, and the second and third switching elements are alternately switched ON/OFF. In a third period, the first and second switching elements are switched ON, and the third and fourth switching elements are switched OFF. The power conversion apparatus provides a release path for inductive energy accumulated in a reactor.
    Type: Application
    Filed: September 2, 2014
    Publication date: December 18, 2014
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Seitaro BANNO, Satoru FUJITA