Having Feedback Isolation (e.g., Optoisolator, Transformer Coupled, Etc.) Patents (Class 363/21.07)
  • Patent number: 10461646
    Abstract: A flyback converter control architecture is provided in which primary-only feedback techniques are used to ensure smooth startup and detection of fault conditions. During steady-state operation, secondary-side regulation is employed. In addition, current limits are monitored during steady-state operation using primary-only feedback techniques to obviate the need for a secondary-side current sense resistor.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: October 29, 2019
    Assignee: Dialog Semiconductor Inc.
    Inventors: Yong Li, Cong Zheng, Xiaoyan Wang, Wenduo Liu
  • Patent number: 10327291
    Abstract: A lamp driver for an LED lamp is provided, comprising a voltage input port for connecting the lamp driver to a power source, a relay that is switchable between an energized state and a de-energized state according to a pick-up voltage, and a relay controller circuit that connects the relay to the voltage input port and that is switchable between a conducting state and an non-conducting state according to a threshold voltage, wherein the pick-up voltage is smaller than the threshold voltage.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: June 18, 2019
    Assignee: LEDVANCE GMBH
    Inventors: ShiYu Ding, Xusheng Yang
  • Patent number: 10289134
    Abstract: One cable compensation circuit is connected to a shunt regulator to generate a feedback voltage corresponding to an output voltage of a power supply device. The cable compensation circuit controls cathode impedance of the shunt regulator according to the output current of the power supply device to compensate a voltage drop generated in a cable.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: May 14, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Youngbae Park, Eunsung Jang, Jaehan Yoon, Byunghak Ahn, Jin-Tae Kim, Taesung Kim, Gwanbon Koo, Keun-Eui Hong
  • Patent number: 10284086
    Abstract: A boost converter having an inductor having a first terminal coupled to an input port to receive the input voltage; a high side switch coupled between the inductor and an output port; a low side switch coupled between the inductor and a ground reference; and a control circuit configured to receive a feedback signal indicative of the output voltage and a reference signal, and to provide a high side control signal and a low side control signal based on the feedback signal and the reference signal; wherein the low side switch on time period is controlled to be constant by the low side control signal when the input voltage and the output voltage are fixed.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: May 7, 2019
    Assignee: Monolithic Power Systems, Inc.
    Inventor: Yike Li
  • Patent number: 10248147
    Abstract: A power supply includes a connector, a power conversion controller to generate a power supply signal at the connector, and a communication and control processor. The communication and control processor is to receive a set of current control parameters including a current limit over a communication link in the connector, receive measurements of current and voltage of the power supply signal, and generate a drive signal for controlling the power conversion controller based on the received current control parameters and the measurements of the current and the voltage.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: April 2, 2019
    Assignee: Motorola Mobility LLC
    Inventors: Daniel H Wagner, Edward D Brann, Mark Carlson, Robert M Johnson, Daniel S Rokusek
  • Patent number: 10181796
    Abstract: The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: January 15, 2019
    Assignee: STMicroelectronics S.r.l.
    Inventors: Claudio Adragna, Giovanni Gritti
  • Patent number: 10153700
    Abstract: A power converter for converting input power to output power includes a first transformer circuit, a second transformer circuit, and balance circuitry. The first transformer circuit includes a first primary winding for receiving a first part of the input power and a first secondary winding for generating a first part of the output power. The second transformer circuit includes a second primary winding for receiving a second part of the input power and a second secondary winding for generating a second part of the output power. The balance circuitry is coupled to a first terminal of the first secondary winding and a second terminal of the second secondary winding, and operable for balancing the first and second parts of the output power by passing a signal between the first and second terminals. The first and second terminals have the same polarity.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: December 11, 2018
    Assignee: O2Micro, Inc.
    Inventors: Catalin Popovici, Alin Gherghescu, Laszlo Lipcsei
  • Patent number: 10075081
    Abstract: An external circuit element RSET is connected in use to an SET terminal. A synchronous rectification controller generates a pulse signal S1 based on a control time determined according to the state of the SET terminal. A driver switches on and off the synchronous rectification transistor according to the pulse signal S1. An abnormal state detection circuit is capable of detecting an open-circuit state and/or a short-circuit state that can occur in the SET terminal. When the abnormal state detection circuit detects such an open-circuit state and/or short-circuit state, the abnormal state detection circuit asserts a detection signal S11. When the detection signal S11 is asserted, a primary-side controller arranged on the primary side of the DC/DC converter is instructed to suspend the switching operation of a switching transistor.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: September 11, 2018
    Assignee: ROHM CO., LTD.
    Inventors: Hiroki Kikuchi, Ryo Shimizu
  • Patent number: 10008941
    Abstract: A combined voltage regulator and snubber circuit generally has a voltage regulator device in parallel with the energy storage element of the snubber circuit operatively connectable in series with a leakage inductance current path; the leakage inductance being part of a magnetic component utilized in a switch-mode power supply having an input voltage source, controllable semiconductor switches, freewheeling semiconductor switches, feedback controller, reactive energy storage components and a load; the voltage regulator generally providing constant or variable voltage to the gate driver of the controllable semiconductor and/or feedback controller.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: June 26, 2018
    Assignee: Appulse Power Inc.
    Inventors: Aleksandar Radic, Seyed-Behzad Mahdavikhah-Mehrabad
  • Patent number: 9998027
    Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: June 12, 2018
    Assignee: CREE, INC.
    Inventors: Michael Walters, Qingcong Hu
  • Patent number: 9866141
    Abstract: A chopped current input electrical energy converter includes at least one conversion module (K1, K2) generating at least one first output signal (Vout1) and one second output signal (Vout2) and including: a transformer (10), an input switching stage (20) controlling the transfer of electrical energy to the transformer (10), and at least one first output stage (30) and one second output stage (40), the first output stage (30) generating the first output signal (Vout1), and the second output stage (40) generating the second output signal (Vout2); the level of the first output signal (Vout1) reflected at a primary winding (11) of the transformer (10) is greater than the level of the second output signal (Vout2) reflected at the primary winding (11) of the transformer (10).
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: January 9, 2018
    Assignee: FAIVELEY TRANSPORT TOURS
    Inventor: Benoit Peron
  • Patent number: 9812976
    Abstract: A power supply includes a control transistor that controls a primary winding of a transformer to induce current on a secondary winding of the transformer to generate an output voltage. A pulse width modulation (PWM) controller integrated circuit (IC) chip drives the control transistor through a gate pin. The PWM controller IC chip has a feedback pin that receives a feedback signal indicative of the output voltage. A high voltage (HV) startup transistor is controlled through the feedback pin. The HV startup transistor turns ON during startup to generate a supply voltage from current received from the input voltage of the power supply. The HV startup transistor turns OFF when the supply voltage reaches a startup voltage level that is sufficient to start the switching operation of the control transistor and thereby receive operating current from an auxiliary winding of the transformer.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: November 7, 2017
    Assignee: Fairchild Semiconductor Corporation
    Inventor: Hangseok Choi
  • Patent number: 9812973
    Abstract: A method for controlling a power converter switch to regulate power delivered to an output of a power converter includes operating the power converter switch in first, second, and third duty cycle control modes in response to a feedback signal. The first duty cycle control mode includes modulating a peak switch current of the power converter switch in response to the feedback signal, and switching the power converter switch at a substantially fixed first switching frequency value. The second duty cycle control mode includes modulating the switching frequency in response to the feedback signal, and maintaining the peak switch current substantially at a peak switch current threshold value. The third duty cycle control mode includes modulating the peak switch current of the power converter switch in response to the feedback signal, and switching the power converter switch at a substantially fixed second switching frequency value.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: November 7, 2017
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Bäurle, Giao Pham
  • Patent number: 9768702
    Abstract: A converter for converting an input-side alternating current into an output-side DC current, with a power factor correction being provided, wherein the converter comprises a transformer having at least two serially arranged primary windings, a first switch is used to switch a storage capacitor unit in series with a first primary winding to the alternating current in a clocked manner via rectification elements and a second primary winding is switchable to the storage capacitor unit in a clocked manner by a second switch.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: September 19, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventor: Christian Augesky
  • Patent number: 9722496
    Abstract: In one embodiment, a method of compensating for transmission voltage loss from a switching power supply, can include: (i) receiving a sampling signal that represents an output current of the switching power supply; (ii) delaying the sampling signal to generate a delayed sampling signal; (iii) converting the delayed sampling signal to generate a compensation signal; and (iv) regulating an output voltage of the switching power supply based on the compensation signal to compensate for the transmission voltage loss from the output voltage transmission to a load such that a voltage at the load is maintained as substantially consistent with an expected voltage at the load.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: August 1, 2017
    Assignee: Silergy Semiconductor Technology (Hangzhou) LTD
    Inventors: Xiaoru Xu, Yunlong Han
  • Patent number: 9602018
    Abstract: In accordance with various embodiments a converter is provided, including: a transformer comprising a primary side and a secondary side; a primary side circuit arrangement coupled to the primary side of the transformer; a secondary side circuit arrangement coupled to the secondary side of the transformer, wherein the secondary side circuit arrangement is configured to provide at least one of an output voltage and an output current; a coupling component configured to provide information about at least one of the output voltage and the output current to the primary side circuit arrangement; a first energy supply configured to provide the coupling component with a first current; and second energy supply configured to provide the coupling component with a second current, wherein the second current is lower than the first current.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: March 21, 2017
    Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
    Inventor: Michael Herfurth
  • Patent number: 9515481
    Abstract: This printed circuit board (12) comprising: a first portion (20) having first electronic components (22) of which the earth electrode is on a first voltage source (14); a second portion (24) having second electronic components (26) of which the earth electrode is on a second voltage source (16); a third portion (28) inserted between the first portion (20) and the second portion (24); a switched-mode power supply circuit (32) connecting the first portion (20) and the second portion (24); the said second portion (24) also comprising an electronic component (30) powered by the said first voltage source (14), is characterized in that it also comprises detection means (34) for detecting a drop in electrical consumption of the component (30) and switching means for switching the switched-mode power supply circuit (32) when a predetermined drop in electrical consumption of the said component (30) is detected.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: December 6, 2016
    Assignee: VALEO JAPAN Co, Ltd
    Inventors: Pierre Sardat, Bruno Hadjelis, Hubert Lescot
  • Patent number: 9502984
    Abstract: An electronic system includes a controller to provide at least dual-mode conduction control of a switching power converter. In at least one embodiment, the controller is capable to control transitions between discontinuous conduction mode (DCM) and critical conduction mode (CRM) of the switching power converter using a measured switching time parameter having a value corresponding with an approximately peak voltage of a time-varying supply voltage supplied to the switching power converter. In at least one embodiment, the controller dynamically compensates for changing parameters of the electronic system by dynamically determining a minimum non-conductive time of the control switch of the switching power converter using the measured switching time parameter value at approximately the peak of the supply voltage of the supply voltage.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: November 22, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: John L. Melanson, Zhaohui He
  • Patent number: 9484740
    Abstract: An electrostatic discharge clamp may include a reference generator and a comparator. The electrostatic discharge clamp may be characterized by a time constant. A voltage difference caused by an electrostatic discharge event may activate the electrostatic discharge clamp. The comparator may hold the electrostatic discharge clamp in an active state responsive to a reference voltage provided by the reference generator. A duration of the active state of the electrostatic discharge clamp may facilitate dissipation of the electrostatic discharge event.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: November 1, 2016
    Assignee: Broadcom Corporation
    Inventors: Ramachandran Venkatasubramanian, Kent Charles Oertle
  • Patent number: 9395402
    Abstract: An isolator includes: a transmission circuit that generates an alternating current transmission signal in which a first potential is set to be a reference potential; a first insulating element to which the alternating current transmission signal is supplied; a second insulating element that generates an alternating current reception signal in which a second potential is set to be a reference potential by being alternating current-coupled to the first insulating element through an insulating film; a reception circuit that reproduces reception data based on the alternating current reception signal; an impedance control unit that controls an impedance of the first or the second insulating element to be higher than an impedance before the control; and a leakage current detection unit that detects a leakage current flowing between the first and the second insulating elements through the first or the second insulating element in which the impedance has been controlled.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: July 19, 2016
    Assignee: Renesas Electronics Corporation
    Inventor: Hirokazu Nagase
  • Patent number: 9362834
    Abstract: The present invention discloses a flyback power supply circuit with a programmable function and a control method thereof. The flyback power supply circuit includes: a transformer circuit, a power switch circuit, a primary side control circuit, an opto-coupler circuit, and a secondary side control circuit. The primary side control circuit determines whether an over voltage condition occurs, and further determines whether to generate an over voltage protection signal to turn OFF a power switch of the power switch circuit according to a rate of increase of a feedback signal and a control level, or according to the rate of increase of the feedback signal and a rate of change of a target control signal.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: June 7, 2016
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Chien-Fu Tang, Isaac Y. Chen, Kuang-Fu Chang, Hsin-Yi Wu, An-Tung Chen
  • Patent number: 9343978
    Abstract: A controller for use in a power converter includes an oscillator that generates a first signal that determines a duration of a switching cycle period of a switch included in the power converter. The controller also includes a logic circuit that generates a second signal to control switching of the switch in response to a feedback signal and in response to the first signal. The logic circuit generates the second signal to control a peak switch current of the switch during each switching cycle period according to either a first mode of operation or a second mode of operation. The peak switch current of the switch is varied in the first mode of operation in response to the feedback signal indicating that an output load is greater than a threshold and the peak switch current of the switch is kept at a constant value in the second mode of operation in response to the feedback signal indicating that the output load is less than the threshold.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: May 17, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Bäurle, Giao Pham
  • Patent number: 9244512
    Abstract: A power supply device having a standby power cutoff structure, comprises: a power supply unit which has a plug connected to a socket, converts an external power for a power supply target device, and generates self-operating power; a connector unit which includes a power supply terminal to supply power to the power supply target device, and opens or blocks a power supply path between the external power and the power supply unit in response to a switching driving signal received from the power supply unit; and a cable for connecting the power supply unit and the connector unit, wherein the power supply unit checks the state of power supplied through a switching unit to output the switching driving signal to the switching unit such that the switching unit cuts off a power supply when the power supply target device is fully charged or the power supply device is turned off.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: January 26, 2016
    Inventor: Chang-Ho Kim
  • Patent number: 9231486
    Abstract: An exemplary power conversion system includes a power converter and a protection circuit coupled with the power converter. The power converter is configured to convert an input power into an output power. The power converter includes an isolator magnetically coupling a primary side and a secondary side and at least one primary switch coupled in series with the primary side. The at least one primary switch is configured to turn on or turn off current to the isolator on the primary side. The protection circuit is coupled to the at least one primary switch. The protection circuit includes a detecting device for detecting switch state of a secondary switch on the secondary side. The detecting device is configured to drive the at least one primary switch according to the detected switch state. A method for operating the power conversion system is also described.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: January 5, 2016
    Assignee: General Electric Company
    Inventor: Wen Luo
  • Patent number: 9185329
    Abstract: A display apparatus, a power supply apparatus and a power supply method are provided. The display apparatus display apparatus includes: a signal receiving unit which receives an image signal; a signal processing unit which processes the image signal; a display unit which displays an image based on the image signal processed by the signal processing unit; and a power supply unit which receives AC power and supplies operation power to the display unit. The power supply unit includes a discharging circuit part which includes a discharging element which discharges the power supply unit to remove a residual voltage from the power supply unit when the AC power is suspended, the discharging circuit part preventing the discharging element from consuming power when the AC power is input. It is possible to minimize wasteful power consumption caused by a discharging element provided to guarantee user's safety against a residual voltage.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: November 10, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Young-soo Kim
  • Patent number: 9154041
    Abstract: A power converter controller includes a drive signal generator coupled to generate a drive signal to control switching of a power switch to regulate a flow of energy to a power converter output in response to an energy requirement of a load. A voltage supply rail is coupled to supply a voltage to the drive signal generator. The supplied voltage is used by the drive signal generator to generate the drive signal. A control circuit is coupled to generate a power down signal that stops the supply of the voltage to the drive signal generator to stop the generation of the drive signal and the control of the switching of the power switch for a period of time. Timer circuitry determines a duration of the period of time and triggers the control circuit to restart the supply of the voltage by the supply rail to the drive signal generator.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: October 6, 2015
    Assignee: Power Integrations, Inc.
    Inventor: David Michael Hugh Matthews
  • Patent number: 9124186
    Abstract: A controller includes a PWM circuit and a timing circuit. The PWM circuit controls a switch in response to a clock signal. A switching period of the clock signal is based on a charging and discharging time of a capacitor included in the timing circuit. Both first and second current sinks discharge the capacitor while the timing circuit is in a normal discharging mode that is when an on time of the switch is less than a threshold time. The second current sink is prevented from discharging the capacitor such that the capacitor is discharged with the first current sink and not the second current sink while the timing circuit is in an alternative discharging mode that is when the on time of the switch exceeds the threshold time. The discharging of the capacitor in the alternative discharging mode increases the switching period of the clock signal.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: September 1, 2015
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Baurle, Guangchao Darson Zhang, Arthur B. Odell, Mingming Mao, Michael Yue Zhang, Edward Deng
  • Patent number: 9118517
    Abstract: Embodiments include systems and methods of powering data communications transmitter circuitry using current sinked from biasing circuitry used to bias a transmission line between the data communications transmitter circuitry and data communications receiver circuitry. In some embodiments, the current sinked from the biasing circuitry is sourced by a power supply configured to power the data communications receiver circuitry. The current sinked from the biasing circuitry is then re-used to power the data communications transmitter circuitry. The data communications transmitter circuitry may be operated using less power overall by re-using the current first used to bias the transmission line to power the data communications transmitter circuitry. Various embodiments include HDMI transceivers, DVI transceivers, and DisplayPort transceivers.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: August 25, 2015
    Assignee: Analogix Semiconductor, Inc.
    Inventor: Hongwu Chi
  • Patent number: 9041245
    Abstract: A power supply apparatus includes a converter to convert AC power into DC power, an SMPS to convert the DC power into DC powers desired by loads, a capacitor to interconnect the converter and the SMPS, a PTC element connected to the converter, a first switch connected in parallel with the PTC element, and a second switch connected in series with the first switch. The method includes turning on the second switch to start charging of the capacitor, turning on the first switch to charge the capacitor to a target voltage level, and turning off both the first switch and second switch if a voltage across the capacitor rises over the target voltage level, to discharge the voltage across the capacitor so as to lower the voltage across the capacitor to the target voltage level or lower.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: May 26, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ho Yoon, Dae Hyun Lim, Joong Ki Moon, Sung Wook Kang
  • Patent number: 9025347
    Abstract: An electronic system includes a controller to provide at least dual-mode conduction control of a switching power converter. In at least one embodiment, the controller is capable to control transitions between discontinuous conduction mode (DCM) and critical conduction mode (CRM) of the switching power converter using a measured switching time parameter having a value corresponding with an approximately peak voltage of a time-varying supply voltage supplied to the switching power converter. In at least one embodiment, the controller dynamically compensates for changing parameters of the electronic system by dynamically determining a minimum non-conductive time of the control switch of the switching power converter using the measured switching time parameter value at approximately the peak of the supply voltage of the supply voltage.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: May 5, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Zhaohui He
  • Patent number: 9013897
    Abstract: A power supply applied to an electronic device for providing power includes a transformer unit, a connector, a pulse-width modulation (PWM) control unit, and a switch unit. The connector is electrically connected with the secondary side of the transformer unit for outputting a first output voltage. The PWM control unit outputs a pulse signal with a first period. The switch unit is electrically connected between the PWM control unit and the primary side of the transformer unit. When the electronic device is connected to the power supply, the connector receives an external control signal, and the PWM control unit adjusts the pulse width of the pulse signal to a second period and transmits the pulse signal with the second period to the switch unit to control the connector to output a second output voltage to the electronic device.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: April 21, 2015
    Assignee: ASUSTeK Computer Inc.
    Inventor: Min-Hua Hsu
  • Patent number: 9007052
    Abstract: A system for sensing voltage in an isolated converter includes an input circuit isolated from an output circuit using a first transformer, the first transformer having a primary coil and a secondary coil, wherein the output circuit includes an output inductor and an output capacitor, and wherein the input circuit includes a power source that provides power to the output circuit through the first transformer; a feedback winding coupled to the output inductor to form a second transformer; and a monitor circuit that calculates a voltage across the output capacitor using a voltage across the feedback winding, a voltage across the primary coil of the first transformer, a turns ratio of the first transformer, and a turns ratio of the second transformer in order to provide feedback to control the input circuit.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: April 14, 2015
    Assignee: Hamilton Sundstrand Space Systems International, Inc.
    Inventors: Jason A. Ohnemus, David A. Fox
  • Publication number: 20150092454
    Abstract: An interleaved forward voltage converter having a first inverter stage has a first transformer having a first secondary winding coupled to a filter inductor. A second converter stage has a second transformer having a second secondary winding coupled to the filter inductor. A diode is coupled between the first and second secondary windings to automatically connect the first and second secondary windings in series when a duty cycle of the converter exceeds 50%. An interleaved forward voltage converter can connect the two primary windings in either parallel or a series configuration. The two secondary windings can be connected in either parallel or a series configuration. Having the two primary windings in parallel and the two secondary windings in series allows the converter to operate with a lower input voltage. Having the two primary windings in series and the two secondary windings in a parallel configuration allows the converter to operate with a higher input voltage.
    Type: Application
    Filed: October 2, 2013
    Publication date: April 2, 2015
    Inventor: Isaac Cohen
  • Patent number: 8964418
    Abstract: An AC to DC converter system is disclosed in which a conversion circuit for converting an AC input signal to a DC output signal is operably coupled with a communication circuit designed for sensing output indicative of the presence or absence of a load at the DC output. The system is designed so that the conversion circuit operates in an inactive standby state when there is no load, and in an active state for supplying DC power when a load is present. The system is configured to operate using ultra-low power.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: February 24, 2015
    Inventors: Amer Atrash, Wayne Chen, Ross Teggatz, Brett Smith
  • Patent number: 8953341
    Abstract: A converter may include a transformer; a first circuit arrangement coupled to a first transformer side; a second circuit arrangement coupled to a second transformer side, wherein the second circuit arrangement is configured to provide an output voltage; a first coupler configured to provide information about the output voltage to the first circuit arrangement; wherein the first circuit arrangement is configured to determine a state of the secondary side based on the received information about the output voltage, and to generate a switch control signal dependent on the determined state; a switch circuit arranged on the second side; and a second coupler configured to provide a switch control signal from the first circuit arrangement to the switch circuit; wherein the switch circuit is coupled to the first circuit arrangement to provide a first circuit arrangement control signal to the first circuit arrangement depending on the switch control signal.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: February 10, 2015
    Assignee: Infineon Technologies AG
    Inventor: Marc Fahlenkamp
  • Publication number: 20150036391
    Abstract: The invention relates to a signal (feed) separator for dead-zero or live-zero measurement signals. The signal (feed) separator has a primary-side (feed) input, a secondary-side output, a direct-current transformer for transferring primary-side measurement input current, an output stage for providing a secondary-side measurement output current, and an auxiliary energy feed-in for supplying the primary side and for supplying the secondary side. The auxiliary voltage of the auxiliary energy feed-in is controlled on the secondary side by a control device with the aid of a measuring device in such a way that the power loss of the output stage is substantially independent of a load connected in the operating state.
    Type: Application
    Filed: December 20, 2011
    Publication date: February 5, 2015
    Applicant: PHOENIX CONTACT GMBH & CO. KG
    Inventors: Heinz-W. Meier, Joerg Blanke
  • Patent number: 8923017
    Abstract: The present invention relates to a power converter (90) and a method of operating same. There are numerous advantages to operating power converters using a series resonant converter (1, 21). This approach is particularly suitable for minimizing switching losses in the power converter when it is operated at high frequency. However, there are problems with the known converters in that they are prone to generate noise in the acoustic spectrum due to the fact that the converter stages are often operating at different frequencies. The present invention relates to a power converter and a method of operating same that enables the operating frequency of the converter to be controlled by a control circuit over a predetermined range of the resonant frequency. This allows reduction in acoustic noise generation and facilitates frequency smearing that will in turn reduce spectral peaks. This is achieved while maintaining output ripple within acceptable ranges.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: December 30, 2014
    Assignee: Texas Instruments (Cork) Limited
    Inventor: George Young
  • Patent number: 8923020
    Abstract: A switching power supply circuit (101) includes a first rectifier circuit (102) converting an alternate current to a direct current, a switching operator (20), a switching transformer (103) including a primary coil supplied with a switched current and a secondary coil inducing power corresponding to the current, a second rectifier circuit (30) rectifying the power induced by the secondary coil, and a control circuit (40) changing a ratio of a current flowing to a photocoupler (107) to an output voltage from the second rectifier circuit (30) in a standby mode and in a power-on mode to reduce a noise of the switching transformer in each of the modes.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: December 30, 2014
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Takeshi Tazawa
  • Publication number: 20140334197
    Abstract: The present disclosure describes a power supply with multiple operating modes, to detect a load condition of an electronic device, and to automatically change between the multiple operating modes to supply an output direct current (DC) signal to the electronic device based on the load condition detected by the load detection mechanism. The power supply includes multiple control topologies that are each associated with one of the operating modes. Changing from a first operation mode to a second operation mode includes changing from a first control topology associated with the first operation mode to a second control topology associated with the second operating mode to supply the output DC signal at a predetermined voltage level.
    Type: Application
    Filed: May 8, 2013
    Publication date: November 13, 2014
    Applicant: Hewlett-Packard Development Company, LP.
    Inventors: Yu Zhao, Lip Kiat Ho, Poo Heng Ng
  • Patent number: 8885361
    Abstract: A device and a method for operating a low power switch mode power supply, where DC input power is converted to AC power by an oscillator, which AC power is transformed to an AC voltage and AC current, which output power is converted into DC power, where the DC voltage is used as a feedback signal for controlling the oscillator. It is the objective of the invention to reduce a standby power consumption of power consuming devices. The oscillator comprises a first and a second current loop, which first current loop generates an activation current for the second current loop, where the primary coil of a transformer is part of the second current loop, and where the second loop comprises a current/voltage measuring system and generates increasing current in the second current loop and closes the current flow in the second current loop.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: November 11, 2014
    Assignee: ZZzero ApS
    Inventors: Rene Ingemann Pedersen, Jan Knudsen
  • Publication number: 20140327718
    Abstract: A power supply system includes: a switching power supply configured to rectify and smooth an alternating current voltage of an alternating current power supply and generate a direct current voltage; a small-capacity power supply having a power supply capacity smaller than a power supply capacity of the switching power supply; a sensor configured to output a detection voltage corresponding to a detection target; and a control device. The control device comprises: a reference voltage generation circuit configured to be fed with power from the small-capacity power supply and generate a reference voltage, a comparison circuit configured to compare the detection voltage output from the sensor with the reference voltage and generate a comparison voltage corresponding to the comparison result of the comparison circuit, and a monitoring unit configured to monitor the detection target based on the comparison voltage during the switching power supply is stopped.
    Type: Application
    Filed: March 27, 2014
    Publication date: November 6, 2014
    Applicant: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Isao KUBO
  • Publication number: 20140301111
    Abstract: A power converter employing a control system configured to make multiple functional use of a circuit node therein and method of operating the same. In one embodiment, the power converter includes a power train including at least one power switch. The power converter also includes a control system including an opto-isolator circuit, including a resistor, configured to receive an output signal from the power converter and provide a feedback signal to a feedback node for the control system to provide a switch control signal for the at least one power switch. The control system also includes a current source configured to produce multiple voltage levels at the feedback node in accordance with the resistor, thereby enabling multiple functional uses of the feedback node.
    Type: Application
    Filed: June 24, 2014
    Publication date: October 9, 2014
    Applicant: POWER SYSTEMS TECHNOLOGIES LTD.
    Inventors: Aaron Jungreis, Antony Brinlee, Paul Garrity
  • Patent number: 8811041
    Abstract: A power supply includes a first circuit, a second circuit, a feedback circuit and a controller. The first circuit has a first switch, and the second circuit has a second switch. The first circuit transforms an input voltage to a middle voltage, and the second circuit transforms the middle voltage to an output voltage. The feedback circuit electrically connects to the controller and the output voltage respectively. The controller includes a first sub-control unit and a second sub-control unit. The first sub-control unit electrically connects to the first switch and the second sub-control unit electrically connects to the second switch. The controller generates a compensation voltage signal for the first sub-control unit and the second sub-control unit to control the first switch and the second switch.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: August 19, 2014
    Assignee: Richtek Technology Corp.
    Inventors: Kuang Feng Li, Kuo Chi Liu, I-Fan Chen, Yen-Te Lee
  • Patent number: 8811044
    Abstract: There is provided a power supply device including: a first controller operating a pulse width modulation (PWM) control integrated circuit (IC) when a load is connected to an output terminal thereof; a second controller determining whether to operate the PWM control IC according to a change in voltage of an auxiliary capacitor connected to the first controller when a load is not connected to the output terminal; and a constant voltage circuit unit supplying a constant voltage to the first controller and the second controller when the PWM control IC operates. Power consumption can be considerably reduced when a load is not connected to the output terminal of the power supply device. Also, since elements for controlling the power supply device are implemented as a single integrated circuit (IC), a leakage current can be reduced to thus minimize power consumption. In addition, voltage can be supplied to the IC while reducing switching noise.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: August 19, 2014
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Jung Chul Gong, Hwan Cho
  • Patent number: 8804378
    Abstract: A method of optimizing a gain adjustment value Kadj for a digital controller in an isolated switched mode power supply. The power supply includes an opto-coupler having a current transfer ratio (CTRX) within a range defined by a minimum current transfer ratio (CTRMIN) and a maximum current transfer ratio (CTRMAX). The method includes determining the CTRX of the opto-coupler, determining an optimal gain adjustment value KadjX based on the determined CTRX of the opto-coupler, and storing the optimal gain adjustment value KadjX in the digital controller. The method can be performed by the digital controller or by a programming device external to the power supply.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: August 12, 2014
    Assignee: Astec International Limited
    Inventors: Antonio Remetio Soleno, Jonathan Ross Bernardo Fauni
  • Publication number: 20140185332
    Abstract: A switching power supply circuit (101) includes a first rectifier circuit (102) converting an alternate current to a direct current, a switching operator (20), a switching transformer (103) including a primary coil supplied with a switched current and a secondary coil inducing power corresponding to the current, a second rectifier circuit (30) rectifying the power induced by the secondary coil, and a control circuit (40) changing a ratio of a current flowing to a photocoupler (107) to an output voltage from the second rectifier circuit (30) in a standby mode and in a power-on mode to reduce a noise of the switching transformer in each of the modes.
    Type: Application
    Filed: July 10, 2012
    Publication date: July 3, 2014
    Applicant: PANASONIC CORPORATION
    Inventor: Takeshi Tazawa
  • Patent number: 8767418
    Abstract: A power converter employing a control system configured to make multiple functional use of a circuit node therein and method of operating the same. In one embodiment, the power converter includes a power train including at least one power switch. The power converter also includes a control system including an opto-isolator circuit, including a resistor, configured to receive an output signal from the power converter and provide a feedback signal to a feedback node for the control system to provide a switch control signal for the at least one power switch. The control system also includes a current source configured to produce multiple voltage levels at the feedback node in accordance with the resistor, thereby enabling multiple functional uses of the feedback node.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: July 1, 2014
    Assignee: Power Systems Technologies Ltd.
    Inventors: Aaron Jungreis, Antony Brinlee, Paul Garrity
  • Patent number: 8767415
    Abstract: The present invention discloses circuits and methods for high efficiency and fast response AC-DC voltage converters. In one embodiment, an AC-DC voltage converter can include: (i) a first stage voltage converter having an isolated topology with a power factor correction function, where the first stage voltage converter is configured to convert an AC input voltage to a series-connected N branches of first stage voltages, where N is a positive integer of at least two; (ii) a second stage voltage converter having a non-isolated topology, where the second stage voltage converter is configured to convert one of the N branches of the first stage voltages to a second stage voltage; and (iii) where the second stage voltage and a remaining of the N branches of the first stage voltages are configured to be series-connected and converted to a DC output voltage.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: July 1, 2014
    Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd.
    Inventor: Wei Chen
  • Patent number: 8754617
    Abstract: A reverse shunt regulator includes a MOSFET connected between a cathode and an anode, a switch and a current source serially connected between the cathode and the anode, and an error amplifier having a positive input node to receive an internal reference voltage, a negative input node connected to the reference electrode, and an output node connected to a control electrode of the MOSFET. When the voltage of the reference electrode is within a range, the larger the voltage of the reference electrode is, the less the current of the MOSFET is. Application of this reverse shunt regulator to a flyback converter for output feedback will reduce the power loss in a green mode of the flyback converter.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: June 17, 2014
    Assignee: Richtek Technology Corp.
    Inventors: Chien-Fu Tang, Issac Y. Chen, Jiun-Hung Pan
  • Patent number: 8724346
    Abstract: A DC/DC converter includes a transformer including primary and secondary coils and an auxiliary coil disposed in a primary coil side; a first output capacitor including a first end having a fixed electric potential and a second end; a first diode disposed in a direction where a cathode of the first diode faces the first output capacitor, between the second end of the first output capacitor and one end of the secondary coil; a switching transistor disposed on a path of the primary coil; a second output capacitor including a first end having a fixed electric potential and a second end; a second diode and a switch disposed between the second end of the second output capacitor and the first port of the auxiliary coil; and a control circuit receiving voltage generated in the second output capacitor through a power supply port and controlling turn-on/off of the switching transistor.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: May 13, 2014
    Assignee: Rohm Co., Ltd.
    Inventor: Satoru Nate