With Automatic Control Of The Magnitude Of Output Voltage Or Current Patents (Class 363/19)
  • Patent number: 10432097
    Abstract: Circuits and methods are provided for supplying power to a transformer of a switching DC/DC voltage converter within a power converter. The power converter includes separate nodes that can potentially supply such power. A first of these nodes is coupled, typically directly and with no energy-storing bulk capacitor, to a rectifier that supplies rectified power from an alternating current power source. A second node is also supplied power from the rectifier, but is coupled to a bulk capacitor that can store and supply energy as needed. The techniques disclosed herein use the first node to supply power to the transformer when feasible, and use the second node, and its associated bulk capacitor, to supply power otherwise. In so doing, the energy storage requirements of the bulk capacitor may be reduced, meaning that the capacitance and associated size of the bulk capacitor may be reduced relative to other power converter circuits.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: October 1, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Anders Lind, Andrey Malinin
  • Patent number: 10367420
    Abstract: Methods and circuits for regulating the voltage of the isolated output of an isolated buck converter. Pursuant to a representative method, a parameter of the primary side of an isolated buck transformer is measured, wherein the parameter is dependent in part upon the output voltage on the secondary side of the transformer. The duty cycle of the isolated buck converter is set based at least in part on the value of the measured parameter.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: July 30, 2019
    Assignee: Texas Instruments Incorporated
    Inventors: Vijay N. Choudhary, David Simon Baba
  • Patent number: 10362653
    Abstract: This disclosure describes methods and apparatuses for controlling an isolated diming circuit. An exemplary circuit may include a voltage input device, a noninverting operational amplifier in electrical communication with a optoelectric coupler, an optoelectric coupler incorporating emitting and receiving photodevices, an inverting operational amplifier in electrical communication with the optoelectric coupler, a voltage output device in electrical communication with the inverting operational amplifier, and a lighting device.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: July 23, 2019
    Assignee: LEDVANCE LLC
    Inventor: Jerome Hittle
  • Patent number: 10360485
    Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: July 23, 2019
    Assignee: Integrated Device Technology, Inc.
    Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
  • Patent number: 10326374
    Abstract: Presented is a converter circuit having main switching circuiton a primary side of a transformer, for controlling supply of a current to a storage inductor on the primary side when the main switching circuit is conductive. The convertor circuit comprises: a control circuit operatively coupled to the main switching circuit and for controlling the main switching circuit, the control circuit comprising a control capacitor adapted to enable the control circuit and turn off the main switching circuit; an auxiliary inductor magnetically coupled to the storage inductor and adapted to trigger the control circuit to operate and turn off the main switching circuit in response to a voltage change in the storage inductor when the main switching circuit being conductive; and a charging circuit coupled between the auxiliary inductor and the control capacitor and adapted to enable the auxiliary inductor to charge the control capacitor.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: June 18, 2019
    Assignee: SIGNIFY HOLDING B.V.
    Inventor: Zhi Quan Chen
  • Patent number: 10326379
    Abstract: Provided is a power conversion device which suppresses a current unbalance of a plurality of secondary circuit modules provided in parallel and is manufactured in a compact size and at a low cost. The power conversion device of the invention is a DC-DC converter which boosts down and outputs an input voltage, and includes an input circuit which includes a switching element and output circuit modules which include a transformer and a rectifier element. A plurality of the output circuit modules are provided. The plurality of output circuit modules are electrically connected to the input circuit.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: June 18, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Tadahiko Chida, Shintaro Tanaka, Akihiro Goto
  • Patent number: 10320300
    Abstract: Power converter and method thereof according to certain embodiments. For example, the power converter includes a primary winding, and a secondary winding coupled to the primary winding. Additionally, the power converter includes a first switch including a first switch terminal, a second switch terminal, and a third switch terminal. The first switch is configured to affect a first current associated with the primary winding. The first switch terminal corresponds to a first voltage, and the second switch terminal corresponds to a second voltage. The first voltage minus the second voltage is equal to a voltage difference. Moreover, the power converter includes a second switch including a fourth switch terminal, a fifth switch terminal, and a sixth switch terminal and configured to affect a second current associated with the secondary winding.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: June 11, 2019
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Qian Fang, Huawei Lv, Zhiliang Chen
  • Patent number: 10284100
    Abstract: A power converter includes an energy transfer element coupled between an input and an output of the power converter. A switch is coupled to the energy transfer element and a control circuit. The control circuit includes a drive signal generator to generate a drive signal to control switching of the switch to regulate the output of the power converter. An event detection circuit is coupled to the drive signal generator to indicate if a switching period of one switching cycle of the drive signal exceeds a threshold switching period. An event counter circuit is coupled to the event detection circuit to render dormant the drive signal generator for a period of time determined by a timer circuit if the event detection circuit indicates a period of a switching cycle of the drive signal exceeds the threshold switching period for a threshold consecutive number of switching cycles.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: May 7, 2019
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Leif Lund
  • Patent number: 10267526
    Abstract: A power conversion apparatus (and an air conditioner including the same) may include a rectifier to rectify a voltage of an input alternating current (AC) power source and a voltage drop device to output a dropped voltage using the voltage from the rectifier. The voltage drop device may include a transformer and a communication voltage output device provided at a secondary side of the transformer to output a direct current (DC) voltage for operation of a communication device. Accordingly, a voltage may be stably supplied to the communication device while reducing standby power.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: April 23, 2019
    Assignee: LG Electronics Inc.
    Inventors: Jongwan Lee, Eungho Kim
  • Patent number: 10079542
    Abstract: A current source generating a charging current and a supply voltage by charging a capacitor with the charging current. The current source has a conversion circuit converting a line voltage into a second voltage, a current generation circuit generating the charging current based on the second voltage, and a control circuit controlling the current generation circuit based on the supply voltage. The charging current is controlled to be at a first current value when the supply voltage is lower than a first threshold voltage, the charging current is controlled to be at a second current value when the supply voltage is higher than a second threshold voltage. The first threshold voltage is lower than the second threshold voltage, and the first current value is lower than the second current value.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: September 18, 2018
    Assignee: Monolithic Power Systems, Inc.
    Inventors: Bin Xiao, Yuedong Chen
  • Patent number: 10079544
    Abstract: A method for controlling an output of a power converter with a control circuit includes generating a drive signal to control switching of a switch to regulate the output of the power converter. It is detected if a switching period of one switching cycle of the drive signal exceeds a threshold switching period. The drive signal is disabled when a period of a switching cycle of the drive signal exceeds the threshold switching period for a threshold consecutive number of switching cycles.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: September 18, 2018
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Leif Lund
  • Patent number: 10008944
    Abstract: Disclosed are a control method and a control circuit for a switching power supply, said switching power supply comprises a secondary side controller and a secondary side MOS transistor connected between a load and a secondary side winding of a transformer. The present invention is used for detecting a working state of the secondary side winding of a transformer and a type of a communication signal transmitted by a load, and for generating a switching pulse signal VG in a Reset Time interval of an on/off cycle according to the type of the communication signal; the primary side controller detects a variation amplitude of the transiently varied signal of the voltage drop at the pin feedback (FB) in the Reset Time interval; if the variation amplitude of the transiently varied signal is greater than a pre-set value ?Vref, the primary side controller judges that the signal is a communication signal, and records the communication signal.
    Type: Grant
    Filed: February 9, 2017
    Date of Patent: June 26, 2018
    Assignee: Suzhou Poweron IC Design Co., Ltd.
    Inventors: Haisong Li, Yangbo Yi, Changshen Zhao, Wenliang Liu
  • Patent number: 10003271
    Abstract: System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal, a second controller terminal and a third controller terminal. The system controller is configured to receive an input signal at the first controller terminal and turn on or off a switch based on at least information associated with the input signal to adjust a primary current flowing through a primary winding of the power conversion system, receive a first signal at the second controller terminal from the switch, and charge a capacitor through the third controller terminal in response to the first signal.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: June 19, 2018
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Lieyi Fang, Zhiqiang Sun
  • Patent number: 9985543
    Abstract: A switching power supply is provided which includes: an output port; a transformer; a first voltage divider circuit, configured to divide a feedback voltage to obtain a first divided voltage; and a primary controller, configured to control a current of the primary winding of the transformer; where the primary controller includes: a first comparison module, configured to compare the first divided voltage with a first reference voltage to obtain a first comparison result; a second comparison module, configured to compare the power supply voltage with a second reference voltage to obtain a second comparison result; and an open circuit protection module, configured to generate an open circuit protection signal, where the primary controller is configured to stop control of the primary winding in response to the open circuit protection signal. The present disclosure can efficiently detect disconnection of the up-sampling resistor of the switching power supply and provide open-circuit protection.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: May 29, 2018
    Assignee: SUZHOU POWERON IC DESIGN CO., LTD.
    Inventors: Yangbo Yi, Haisong Li, Changshen Zhao, Wenliang Liu, Ping Tao
  • Patent number: 9966865
    Abstract: The power supply apparatus includes a control unit that can perform intermittent operation of alternately repeating a switching period and a switching halt period, wherein the switching period is for performing switching operation of alternately turning on or turning off two switching elements across a turn-off period for turning off both of the two switching elements, and the switching halt period is for halting the switching operation. In a transition from the switching period to the switching halt period, the control unit makes the transition to the switching halt period after turning on a second switching element. In a transition from the switching halt period to the switching period, the control unit also makes the transition to the switching period after turning on the second switching element.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: May 8, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yasuhiro Shimura, Hiroki Asano
  • Patent number: 9948191
    Abstract: A constant output circuit is disclosed that includes a power supply circuit, a LM-FOT control circuit, a switching circuit and a transformer. Output ends of the power supply circuit are respectively connected with a first input end of the LM-FOT control circuit and an end of a primary winding of the transformer. A controlling end of the LM-FOT control circuit is connected with a controlled end of the switching circuit. A second input end of the LM-FOT control circuit is connected with an output end of the switching circuit. An input end of the switching circuit is connected with the other end of the primary winding of the transformer. An end of a secondary line winding of the transformer is configured for outputting constant voltage signals. Another end of the secondary line winding of the transformer is grounded.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: April 17, 2018
    Assignee: TCL Technoly Electronics (Huizhou) Co., Ltd
    Inventors: Jianzhong Chen, Jitao Yang
  • Patent number: 9912228
    Abstract: A start-up circuit includes an input node, an output node, a reference node, and a depletion mode field-effect transistor (FET) having a first terminal coupled to the input node, a second terminal coupled to the output node, and a gate terminal. A Zener diode has a cathode coupled to the gate terminal of the FET and an anode coupled to the reference node. A first capacitor is coupled in parallel with the Zener diode, a first resistor is coupled between the gate terminal of the FET and the input node, and a second resistor is coupled between the second terminal of the FET and the reference node. The FET and the second resistor are configured to generate an output voltage on the output node, the output voltage being based on an input voltage on the input node and capped at a value below a peak value of the input voltage.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: March 6, 2018
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Mohammad Al-Shyoukh, Percy Neyra
  • Patent number: 9866125
    Abstract: An ac-dc power converter controller includes a switch driver circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from an input of the power converter to an output of the power converter. An input sense circuit is coupled to receive an input sense signal representative of the input of a power converter. A sense enable circuit is coupled to generate a sense enable signal in response to the drive signal. The sense enable signal is coupled to control the input sense circuit to sense the input sense signal for an extended duration of time after the power switch turns OFF.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: January 9, 2018
    Assignee: Power Integrations, Inc.
    Inventors: Zhao-Jun Wang, Giao Minh Pham, Roland Sylvere Saint-Pierre
  • Patent number: 9812944
    Abstract: A discharge device includes a switch element connected in parallel to an electrical storage element; a constant current output unit which supplies a constant current to the switch element; and a control unit which gives an on or off instruction to the constant current output unit, wherein a configuration is such that the control unit controls the constant current output unit so as to cause energy with which is charged in the electrical storage element to be discharged while being consumed by the switch element, and within an optional time for which an energization current of the switch element reaches a limiting current of the switch element, turn off the switch element in a region in which the energization current is lower than the limiting current.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: November 7, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toru Daigo, Taisuke Iwakiri, Takuya Miyanaga
  • Patent number: 9780638
    Abstract: Systems and methods to generate drive current in a power supply, independent of the input voltage, are provided. The power supply includes front end circuitry, control circuitry, and drive circuitry. The front end circuitry includes protection circuitry to defend against damage from EMI, voltage spikes, and the like. The control circuitry includes startup circuitry, power factor correction (PFC) circuitry, and output power configuration circuitry. The startup circuitry provides operational voltage to the PFC circuitry, derived from an input voltage, until an internally generated operational voltage becomes available. The PFC circuitry uses the operational voltage to generate output power for the drive circuitry based on the output power configuration circuitry. The drive circuitry includes drive current configuration circuitry to generate a drive current to drive a load, coupled to the power supply, independent of the input voltage.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: October 3, 2017
    Assignee: LEDVANCE LLC
    Inventor: Victor M. Simi
  • Patent number: 9766584
    Abstract: A switching power supply comprises a transformer; a switching element; a power supply control section which outputs a first gate voltage of a first pulse width consecutively for plural times when the switching element is driven in a burst mode in which the switching element is intermittently driven; a drive time control section which, based on the first gate voltage input consecutively for plural times when the switching element is driven, outputs a second gate voltage to the switching element consecutively for plural times and gradually increases a pulse width of the second gate voltage to a first pulse width from a second pulse width narrower than the first pulse width; and a switching section to which a feedback voltage is input which switches an input destination of the first gate voltage output by the power supply control section from the switching element to the drive time control section in the burst mode.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: September 19, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Takuya Ogishima
  • Patent number: 9712045
    Abstract: According to an embodiment, a circuit comprising includes a first switching circuit coupled to a power supply input, a second switching circuit coupled to an output of the first switching circuit, a supply capacitor coupled to the second switching circuit, and a startup cell coupled to the power supply input and the supply capacitor. The startup cell is configured to electrically couple the power supply input to the supply capacitor when the second switching circuit is not actively switching. The startup cell is also configured to electrically decouple the power supply input from the supply capacitor when the second switching circuit is actively switching.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: July 18, 2017
    Assignee: Infineon Technologies Austria AG
    Inventors: Mingping Mao, Junyang Luo, Guoxing Zhang
  • Patent number: 9705412
    Abstract: The present disclosure is directed to a switching power converter having a regulated output voltage or output current. The power converter uses a control unit having a signal conditioning circuit to produce a control voltage signal, which is used to drive a power stage of the converter. The signal conditioning circuit includes a comparator that compares a measured electrical quantity to a reference value representative of a desired regulated output quantity, and produces a digital detection signal based on the comparison. A control actuator uses the digital detection signal to produce a correction signal, which is received by an averaging circuit. The averaging circuit then produces the control voltage signal based on an average of the correction signal.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: July 11, 2017
    Assignee: STMICROELECTRONICS S.R.L.
    Inventor: Claudio Adragna
  • Patent number: 9667155
    Abstract: A switching power supply includes: a transformer having a primary coil and a secondary coil; a switching element that is connected in series to the primary coil of the transformer so as to turn a direct-current input voltage applied to the primary coil of the transformer ON and OFF; a rectifying and smoothing circuit that rectifies a voltage induced in the secondary coil of the transformer to generate a direct-current output voltage; and a control circuit that turns the switching element ON and OFF in accordance with the direct-current output voltage, wherein the control circuit includes an input correction circuit that detects a switching period of the switching element and limits a peak value of a current flowing through the switching element in accordance with the detected switching period.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: May 30, 2017
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Naotaka Matsuda
  • Patent number: 9651927
    Abstract: A power supply control system includes a remaining level detector 22 of a power-storing device 20; and an estimate computing unit 42 which estimates a prospective power generation of power-generating equipment 10 and a prospective load power consumption of connected loads, and thus, based thereupon and remaining level, a dischargeable time until remaining level reaches the minimum level, and computes an average power generation output of a power-generating equipment 10 and an average load power consumption connected loads 101-105, and thus power generation reaching time until the average power generation output reaches the average load power consumption; and a controller 43 which controls, if the dischargeable time is shorter than the power generation reaching time, to reduce power consumption of the connected loads 101-105.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: May 16, 2017
    Assignee: KYOCERA CORPORATION
    Inventor: Ryo Noguchi
  • Patent number: 9627985
    Abstract: A secondary control circuit includes a voltage regulator circuit coupled to an output of the power converter to provide a regulated power supply. One or more switched loads are coupled between a first terminal and an output ground terminal. The first terminal is coupled to the output of the power converter. Each switched load is coupled to draw a respective current from a load current to clamp the output of a power converter. One or more comparator circuits are coupled to a second terminal. The second terminal is coupled to receive an output sense signal. Each comparator circuit is coupled to receive a reference signal that is a scaled representation of a first reference signal. Each switched load is switched in response to a respective comparator circuit to draw a respective current from the load current of the power converter to clamp the output of the power converter.
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: April 18, 2017
    Assignee: Power Integrations, Inc.
    Inventors: David Michael Hugh Matthews, Balu Balakrishnan, Alex B. Djenguerian
  • Patent number: 9621061
    Abstract: The power supply apparatus for obtaining a direct current from an alternating voltage source includes a first DC/DC converter for outputting a first direct current and a second DC/DC converter for a second direct current lower than the first direct current from the first DC/DC converter, and the output voltage of the first DC/DC converter is changed to a lower direct current and the second DC/DC converter is driven in a continuously-conducting state.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: April 11, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Minoru Hayasaki, Keisuke Samejima
  • Patent number: 9601982
    Abstract: A method of and device for reducing power loss in a voltage conversion circuit. The voltage conversion circuit comprises a main power circuit and a switchable auxiliary circuit, which comprises a first and a second winding circuits. A switch controls the use of the first winding circuit, the second winding circuit, or both to reduce power lose during the voltage conversion.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: March 21, 2017
    Assignee: Flextronics AP, LLC
    Inventors: Martin Zhang, Wei Li, Anthony Brinlee
  • Patent number: 9599640
    Abstract: Various arrangements for determining a voltage of a voltage source using pre-charging are presented. Such arrangements may include a measurement module which includes an analog to digital converter, a driver, and an interface. The interface may be electrically coupled with the analog to digital converter and the driver. The driver may be configured to output current to charge a capacitor. After a first predefined period of time, the driver may stop outputting current to pre-charge the capacitor. After the driver has stopped pre-charging the capacitor and a second predefined period of time has elapsed, the analog to digital converter may be configured to measure a voltage of the capacitor. Such arrangements may include a capacitor, wherein the capacitor is electrically coupled with the interface of the measurement module.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: March 21, 2017
    Assignee: ECHOSTAR TECHNOLOGIES L.L.C.
    Inventor: Jeremy Mickelsen
  • Patent number: 9590511
    Abstract: A power source apparatus comprises: a transformer that insulates a primary system and a secondary system and uses primary/secondary windings to transform an input voltage into an output voltage; a switching control device that is disposed in the primary system to drive the primary winding, and an output monitor device that is disposed in the secondary system to monitor the output voltage. The transformer includes a first auxiliary winding disposed in the primary system and a second auxiliary winding disposed in the secondary system. The output monitor device drives the second auxiliary winding to generate an induced voltage in the first auxiliary winding when the output voltage becomes smaller than a predetermined threshold voltage. The switching control device temporarily stops driving of the first winding upon detecting a light load state and resumes the driving of the first winding upon detecting the induced voltage in the first auxiliary winding.
    Type: Grant
    Filed: October 6, 2014
    Date of Patent: March 7, 2017
    Assignee: Rohm Co., Ltd.
    Inventor: Satoru Nate
  • Patent number: 9564824
    Abstract: Converters (1) for supplying pulsed power to light sources (8) comprise switching parts (2) and controlling parts (3) for adapting switching parameters of the switching parts (2) for improving a performance. The switching part (2) may comprise first/second switches (41, 42) that are in first/second modes during a first time interval of a cycle and vice versa during a second time intervals of a cycle. A group of cycles results in a pulse of the pulsed power. A switching parameter such as the first time interval of a first cycle may be shortened to reduce overshoot. A switching parameter such as the second time interval of the first cycle may be shortened or lengthened. A switching parameter such as the second time interval of a last cycle may be lengthened or shortened to reduce overshoot. A third switch (93) for switching the light source (8) is activated and de-activated delayedly to improve transient behavior.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: February 7, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Carsten Deppe, Reinhold Elferich
  • Patent number: 9525359
    Abstract: A switching power supply apparatus includes a voltage holding unit which holds voltage generated in an auxiliary winding of a transformer, and a voltage detecting unit which detects voltage applied to the first switching unit. When the first switching unit operates such that voltage generated in a secondary winding of the transformer may be low, voltage is supplied from the voltage holding unit to the first switching unit in accordance with the voltage detected by the voltage detecting unit to thus turn on the first switching unit.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: December 20, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Nemoto
  • Patent number: 9501077
    Abstract: A main rectifying/smoothing circuit is connected to one end of a secondary winding of a transformer and a plurality of rectifying/smoothing circuits are connected to a plurality of central taps of the secondary winding. The rectifying/smoothing circuits are each equipped with a switch. In a preliminary driving period, a DSP, which controls the switches, reads forward drop voltages of first to third diode loads and sets feedback gains corresponding to the forward drop voltages. The DSP controls the switches based on the set feedback gains and begins rated driving.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: November 22, 2016
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hirotsugu Asai, Hironori Matsumoto
  • Patent number: 9496241
    Abstract: A hybrid integrated circuit in a wafer level package for an implantable medical device includes one or more passive component windings formed, at least in part, along one or more routing layers of the package. The windings may be primary and secondary windings of a transformer, wherein all or part of a magnetic core thereof is embedded in a component layer of the wafer level package. If the core includes a part bonded to a surface of the package, that part of the core may be E-shaped with legs extending into the routing layers, and, in some cases, through the routing layers. Routing layers may be formed on both sides of the component layer to accommodate the transformer windings, in some instances.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: November 15, 2016
    Assignee: Medtronic, Inc.
    Inventors: Mohsen Askarinya, Mark R Boone, Andreas A Fenner, Lejun Wang, Kenneth Heames
  • Patent number: 9484822
    Abstract: A control circuit for use in a power converter includes a drive signal generator coupled to generate a drive signal to control switching of a switch to regulate an output of the power converter. An event detection circuit is coupled to the drive signal generator to indicate if a switching period of one switching cycle of the drive signal exceeds a threshold switching period. An event counter circuit is coupled to the event detection circuit to render dormant the drive signal generator if the event detection circuit indicates a period of a switching cycle of the drive signal exceeds the threshold switching period for a threshold consecutive number of switching cycles.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: November 1, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Leif Lund
  • Patent number: 9444345
    Abstract: The invention concerns a method and device for controlling the switching operation in a switch mode power supply module. The switch mode power supply module is intended to supply power to an item of equipment. The method comprises the steps of measuring, in the switch mode power supply module, the load current and comparing the measured load current with a predefined load current threshold value, and, cyclically interrupting the switching operation if the measured load current inside the device is less than the predefined load current threshold value.
    Type: Grant
    Filed: February 10, 2013
    Date of Patent: September 13, 2016
    Assignee: Thomson Licensing
    Inventors: Philippe Marchand, Gerard Morizot, Philippe Guillot
  • Patent number: 9442503
    Abstract: Techniques for providing negative current information to a control loop for a buck converter in reverse boost mode. In an aspect, negative as well as positive current through an inductor is sensed and provided to adjust a ramp voltage in the control loop for the buck converter. The techniques may prevent current through the inductor during reverse boost mode from becoming increasingly negative without bound; the techniques thereby reduce settling times when the target output voltage is reduced from a first level to a second level. In an aspect, the negative current sensing may be provided by sensing negative current through a charging, or PMOS, switch of the buck converter. The sensed negative current may be subtracted from a current used to generate the ramp voltage.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: September 13, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Joseph D Rutkowski, Lennart Karl-Axel Mathe
  • Patent number: 9413249
    Abstract: A switching power converter provides regulated voltage to a load. The switching power converter comprises a transformer including a primary winding coupled to an input voltage and a secondary winding coupled to an output of the switching power converter. The switching power converter further comprises a power switch coupled to the primary winding and a rectifier coupled to the secondary winding. Current is generated in the primary winding responsive to the power switch being turned on and not generated responsive to the power switch being turned off. A detection circuit measures a voltage across the rectifier. If the detection circuit detects a decrease in the voltage across the rectifier outside of a blanking period, the detection circuit generates a current pulse in the secondary winding of the transformer. A fast power-on-reset device generates a startup signal to activate the detection circuit at an end of the blanking period.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: August 9, 2016
    Assignee: Dialog Semiconductor Inc.
    Inventors: Pengju Kong, Henry Wong, Wesley Ma, Judy Sha
  • Patent number: 9402287
    Abstract: When a detection voltage VCS that corresponds to a voltage drop across a detection resistor RCS exceeds a first threshold value VADIM, a current limit comparator asserts a reset pulse. A zero current detection circuit asserts a set pulse configured as an instruction to turn on a switching transistor. A logic circuit generates a control pulse based on the reset pulse and the set pulse. When a transition occurs in a dimming pulse from an on level to an off level in a period in which the control pulse is set to the on level, the dimming pulse adjusting unit delays this transition to a next off period of the control pulse.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: July 26, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Yoshikazu Sasaki
  • Patent number: 9367109
    Abstract: On embodiment of a device with a noise adaptive power supply includes a noise adaptation unit configured to receive a noise adaptation signal. The noise adaptation unit can provide processing, such as digital filter processing to reduce the effect of power supply noise. In one embodiment, a feedback signal is used to adjust the output voltage of the power supply. The noise adaptation signal can be similar to the feedback signal. The noise adaptation unit can provide the processing in response to the noise adaptation signal.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: June 14, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Linda Stacey Irish, Francesco Carobolante
  • Patent number: 9349533
    Abstract: A PWM module is provided to output a driving pulse to a switching device in synchronization with a synchronizing pulse having a frequency twice the frequency of the high-frequency current of a primary-side induction line. The PWM module performs output voltage feedback control such that the output voltage of an output capacitor is set at a reference voltage. The module outputs, to the switching device, the driving pulse having a half width of the pulse width of a driving pulse that can be outputted, at the start of power supply to the primary-side induction line. Moreover, the module forcibly performs the output voltage feedback control if an output voltage of the output capacitor does not increase to the reference voltage within a reference time.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: May 24, 2016
    Assignee: Daifuku Co., Ltd.
    Inventor: Masaaki Yamamoto
  • Patent number: 9331259
    Abstract: An intrinsic piezoelectric transformer circuit a piezoelectric transformer circuit is provided that has a primary side component including first and second electrodes, a secondary side component including first and second electrodes, and at least one tertiary component including first and second electrodes. A power bridge is provided which includes one or more switches, each switch has a gate terminal that is directly connected to the second electrode of the tertiary component of the piezoelectric transformer. The first electrode of the tertiary component of the piezoelectric transformer is connected to a reference for the one or more switches of the power bridge. The first electrode of the primary component of the piezoelectric transformer is electrically connected to a power bridge output and the second electrode of the primary component of the piezoelectric transformer is connected to a ground terminal.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: May 3, 2016
    Assignee: QorTek, Inc.
    Inventors: Gareth J. Knowles, William M. Bradley, John Murray, Ross Bird, Jon Zook
  • Patent number: 9293981
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: March 22, 2016
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9263956
    Abstract: A switch-mode power supply control apparatus includes a PWM controller for outputting a driving signal and a short-circuit protection module coupled to a detection terminal. The detection terminal receives a zero-crossing detection voltage. If the time that the detection voltage input to the detection terminal is lower than a first reference voltage exceeds a predetermined time period, the short-circuit protection module determines that a short-circuit abnormal situation occurs, the short-circuit protection module outputs a short-circuit signal to the PWM controller, and the driving signal output by the PWM controller becomes a turn-off signal. If the short-circuit protection module does not detect the short-circuit abnormal situation, the PWM controller operates normally. A flyback switch-mode power supply includes the switch-mode power supply control apparatus. The flyback switch-mode power supply has a low power consumption when a short-circuit protection is taking place.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: February 16, 2016
    Assignee: HANGZHOU SILAN MICROELECTRONICS CO., LTD.
    Inventors: Xianming Tang, Yunlong Yao, Jianxing Wu
  • Patent number: 9252743
    Abstract: In one embodiment, an apparatus includes a clock generator to generate differential clock signals. The apparatus also includes a distributed polyphase filter to obtain phase-corrected multi-phase clock signals based on the differential clock signals.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: February 2, 2016
    Assignee: Intel Corporation
    Inventor: Hongjiang Song
  • Patent number: 9232625
    Abstract: An inverter device includes a switching device which performs on-off switching of an input voltage, a step-up transformer which applies an excitation current to its winding during a switching-device-on period and outputs an output voltage during a switching-device-off period, an input-voltage detector which detects the input voltage and output an input-voltage detection signal, an output voltage detector which detects the output voltage and output an output-voltage detection signal, an output-produced-period detector which detects a period when the output voltage is produced based on the output-voltage detection signal, a comparator which detects a period when the output-voltage detection signal exceeds the input-voltage detection signal and output information indicating the output-high period, and a shifting unit which shifts the information indicating the output-high period to a next period when absence of the output produced period is detected.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: January 5, 2016
    Assignee: Ricoh Company, Ltd.
    Inventor: Hisahiro Kamata
  • Patent number: 9225257
    Abstract: A power supply circuit (1) including: rectifying and smoothing circuit (31); transistor (switching element) (37) connected to an output terminal of the rectifying and smoothing circuit (31); transformer (TF1) including primary coil (L36) connected to the transistor (37) and secondary coil (L47) magnetically coupled with the primary coil (L36); current detector circuit (41) detecting current flowing through the transistor (37), and outputting voltage corresponding to the current; voltage output circuit (44) outputting, while the transistor (37) is in a turned-on state, voltage dependent on voltage induced by the secondary coil (L47); and on-off control circuit (57) turning off the transistor (37) when absolute value (Vbe) of a difference between the voltage from the current detector circuit (41) and the voltage from the voltage output circuit (44) is no smaller than threshold voltage (Von), and turning on the transistor (37) when the absolute value (Vbe) is smaller than the threshold voltage (Von).
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: December 29, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazuhiko Itoh, Masanobu Murakami, Kazushige Sugita
  • Patent number: 9190914
    Abstract: In a switching power supply apparatus, a main switching control circuit performs switching control of a low-side switch device and a high-side switch device based on a feedback signal corresponding to a main output voltage output from a secondary winding of a transformer, and applies and stops applying a voltage to a primary winding of the transformer. A digital signal processor, in accordance with the load status of the main load, changes set target values, performs switching control of switch devices of the sub-rectifying and smoothing circuits, and drives sub-loads.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: November 17, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hirotsugu Asai, Hironori Matsumoto
  • Patent number: 9160234
    Abstract: In a switching power supply apparatus, a low-side switching device is connected in series with a primary winding. A high-side switching device and the primary winding define a closed loop. A voltage induced in a high-side drive winding is applied to the high-side switching device to turn on the high-side switching device. A transistor, which is turned on/off in accordance with the voltage across a capacitor charged by the voltage induced in the high-side drive winding, is connected to the gate terminal of the high-side switching device. When the capacitor is charged and the transistor is turned on, the high-side switching device is turned off. The capacitor is discharged by the voltage induced in the high-side drive winding, during the ON period of the low-side switching device.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 13, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Naoki Yamaguchi
  • Patent number: 9130463
    Abstract: A drive circuit for a switching element includes a constant-current control unit and a restriction unit. The constant-current control unit performs a constant-current control for charging an open/close control terminal of a switching element to be driven which is a voltage-controlled switching element with electric charge for turning on the switching element. The restriction unit restricts, to a reference voltage, a voltage between the open/close control terminal and a first end of a pair of ends of a current flow path of the switching element for a predetermined period following a start of the constant-current control within a charging process period during which the open/close control terminal is charged with the electric charge such that the switching element is turned on.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: September 8, 2015
    Assignee: DENSO CORPORATION
    Inventors: Takeyasu Komatsu, Yoshiyuki Hamanaka, Tsuneo Maebara, Ryotaro Miura