Having Output Current Feedback Patents (Class 363/21.17)
  • Publication number: 20120057376
    Abstract: It is an object to obtain a detection circuit for detecting feedback voltage without variation in output voltage/current or in output voltage by the operation temperature, and a power supply circuit including thereof. A power supply circuit includes a detection circuit, an amplifier circuit outputting an output voltage, a control circuit, and a divider circuit. The detection circuit includes first and second reference voltage generation circuits and an input signal adjustment circuit. The control circuit is electrically connected to the amplifier circuit and includes the detection circuit, an error amplifier circuit, a pulse width modulation driver, a triangle-wave generation circuit, and a capacitor. The divider circuit is electrically connected to the amplifier circuit and the control circuit and inputs a voltage obtained by dividing the output voltage to the second reference voltage generation circuit.
    Type: Application
    Filed: August 19, 2011
    Publication date: March 8, 2012
    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventor: Yoshiaki ITO
  • Publication number: 20120051099
    Abstract: A power conversion device includes an inverter circuit converting DC power into AC power and including switching devices constituting upper and lower arms, a control circuit controlling the switching devices, a drive circuit driving the switching devices by a signal from the control circuit, and an insulated power supply circuit supplying power to the drive circuit. The control circuit controls a power supply voltage to be outputted from the power supply circuit to the drive circuit. The drive circuit drives the switching devices and based on a carrier frequency and the power supply voltage. The power supply circuit includes a feedback output circuit through which the voltage outputted to the drive circuit is outputted to a power supply control IC. The feedback output circuit includes a dummy load circuit which controls the voltage to be outputted to the power supply control IC based on a change of the carrier frequency.
    Type: Application
    Filed: August 19, 2011
    Publication date: March 1, 2012
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Seiji FUNABA, Yasuo Noto, Masashige Tsuji
  • Publication number: 20120044724
    Abstract: A switching power supply apparatus that can precisely control the overload protection voltage is provided.
    Type: Application
    Filed: April 9, 2010
    Publication date: February 23, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Naohiko Morota, Kazuhiro Murata
  • Publication number: 20120039098
    Abstract: A controller for a power converter and method of operating the same. In one embodiment, the controller includes a peak detector, coupled to a circuit element of the power converter, configured to produce a signal corresponding to a peak current through a circuit element. The controller also includes an adjustable reference circuit responsive to a difference between the signal and a reference signal corresponding to a desired peak current to produce a corrected signal corresponding to the peak current.
    Type: Application
    Filed: August 10, 2011
    Publication date: February 16, 2012
    Applicant: Power Systems Technologies, Inc.
    Inventor: Ralf Schroeder genannt Berghegger
  • Publication number: 20120014142
    Abstract: A power conversion apparatus for correcting power factor, which converts an input voltage to an output voltage, comprises: an inductive component, a unidirectional conducting component, a switch, an energy storage component, a capacitive component, and an output circuit. The unidirectional conducting component connects to the inductive component and the switch in series. The energy storage component connects to the switch and the capacitive component in series. The capacitive component has a bias voltage. The output circuit couples to the energy storage component for outputting the output voltage. Wherein, the switch in a conduction state is capable of charging the inductive component by applying the input voltage and charging the energy storage component by applying the bias voltage, and the switch in a cutoff state is capable of discharging the capacitive component and the energy storage component to the output circuit and discharging the inductive component to the capacitive component.
    Type: Application
    Filed: July 19, 2010
    Publication date: January 19, 2012
    Inventors: KUN-NAN TSAI, Fu-Tien Lee
  • Patent number: 8098503
    Abstract: A power converter controller is disclosed. An example power converter controller includes a feedback sensor circuit coupled to receive a feedback signal representative of an output of the power converter. The controller also includes a feedback sampling signal generator coupled to generate a feedback sampling signal coupled to be received by the feedback sensor circuit. The feedback sensor circuit is coupled to sample the feedback signal in response to the feedback sampling signal. The controller also includes a state machine coupled to the feedback sensor circuit to control switching of a switch of the power converter circuit according to one of a plurality of operating condition states in response to the feedback sensor circuit. The controller also includes a feedback time period signal generator coupled to generate a feedback time period signal coupled to be received by the state machine. A period of a feedback time period signal is substantially greater than a period of the feedback sampling signal.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: January 17, 2012
    Assignee: Power Integrations, Inc.
    Inventors: Yury Gaknoki, Mingming Mao, David Michael Hugh Matthews, Tiziano Pastore
  • Publication number: 20120008347
    Abstract: A DC/DC converter circuit configuration contains a rectifier configuration, an inductance and at least one circuit breaker for switching the inductance on its input side. When controlling the circuit configuration, an off time of the circuit breaker is variably changed on the basis of the output power of the circuit configuration and the circuit breaker is respectively switched on in the region of a minimum of a voltage curve across the circuit breaker in order to minimize the switching losses and achieve a high level of efficiency.
    Type: Application
    Filed: July 7, 2011
    Publication date: January 12, 2012
    Applicant: DIEHL AKO STIFTUNG & CO. KG
    Inventor: CHRISTOPH SCHILL
  • Patent number: 8085560
    Abstract: A power supply apparatus includes: a transformer which converts input power supplied to a primary winding to be induced to a secondary winding; a current detector which detects an output current of the secondary winding of the transformer; a voltage detector which detects an output voltage of the secondary winding of the transformer; a switch which adjusts the output voltage outputted by the transformer; and a controller which controls the switch to maintain output power obtained by multiplying the output current by output voltage, within a predetermined level.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: December 27, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Seung-hak Lee
  • Patent number: 8081496
    Abstract: An example power converter includes an energy transfer element, a switch, a controller, and a current offset circuit. The controller is coupled to switch the switch between an ON state and an OFF state to regulate the output of the power converter. The controller is also adapted to terminate the ON state of the switch in response to a switch current flowing through the switch reaching a switch current threshold. An auxiliary winding of the energy transfer element is adapted to generate an auxiliary winding voltage that is representative of an input voltage of the power converter only during the ON state of the switch. The current offset circuit is coupled to the auxiliary winding to generate an offset current to flow through the switch in response to the auxiliary winding voltage, where an input current of the power converter is adjusted in response to the offset current.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: December 20, 2011
    Assignee: Power Integrations, Inc.
    Inventor: David Michael Hugh Matthews
  • Publication number: 20110292693
    Abstract: In a direct-current power supply device that includes a smoothing capacitor C1, which performs a DC/DC converter operation, a transformer T1, a switching element Q1, a diode D2, a smoothing capacitor C2, a reactor L1, which performs a PFC operation, a fast recovery diode D1 and a switching element Q1, when compared with the case of a rated load, the voltage of the smoothing capacitor C1 of a PFC circuit rises at a time when a load is light. Therefore, the following has been required: a capacitor having a sufficient withstanding voltage rating, or an operation of connecting a plurality of capacitors in series or any other operation to secure a voltage-withstanding capability.
    Type: Application
    Filed: May 19, 2011
    Publication date: December 1, 2011
    Inventors: Tetsuya NIIJIMA, Hiroyuki Chikashige
  • Patent number: 8059431
    Abstract: An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a load current value detected by detection resistors R7 and R8 is compared with a reference voltage by an input-side transistor Q4 and an output-side transistor Q3 which compose a first current mirror circuit 14, so that it is possible to determine whether an overcurrent occurs or not. Moreover, a current passing through the output circuit of the transistor Q3 is temperature-compensated by a second current mirror circuit 17 made up of transistors Q6 and Q5.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: November 15, 2011
    Assignee: Panasonic Corporation
    Inventors: Hideki Nishihara, Akeyuki Komatsu
  • Publication number: 20110267850
    Abstract: A method and an apparatus of operating a primary-side-regulation power converter at both continuous current mode and discontinuous current mode are provided. The apparatus includes a switching circuit, a signal generator, a correlation circuit, and a feedback modulator. The signal generator generates a half signal and a second sampling pulse in response to a switching signal. The correlation circuit receives the half signal, the second sampling pulse and a switching-current signal for generating a modulating current. The feedback modulator modulates a feedback signal in response to the modulating current, a detection signal and the switching signal. The detection signal obtained from a transformer is correlated to an output voltage of the primary-side-regulation power converter. An on-period of the half signal is half of an on-period of the switching signal. The switching-current signal is sampled at a falling-edge of the half signal.
    Type: Application
    Filed: June 21, 2010
    Publication date: November 3, 2011
    Applicant: SYSTEM GENERAL CORPORATION
    Inventors: Li Lin, Rui-Hong Lu
  • Publication number: 20110255313
    Abstract: A power converter control method and apparatus is disclosed. An example control circuit includes a clock signal generator coupled to generate a clock signal to control switching of a power switch to be coupled to the control circuit. A feedback circuit is coupled to receive a feedback signal which is representative of an output of a power converter during a duration of a feedback portion of an off time of the power switch. The feedback circuit is coupled to respond to the feedback signal to control the clock signal generator to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period.
    Type: Application
    Filed: June 22, 2011
    Publication date: October 20, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Chan Woong Park, Leif O. Lund
  • Patent number: 8018742
    Abstract: The present invention discloses a full-range-duty PWM signal generation method for an AC-to-DC power conversion, comprising the steps of: generating a saw-tooth signal with a predetermined valley voltage; generating a reference signal according to at least one of a current feedback signal and a voltage feedback signal; and generating a PWM signal according to voltage comparison of the saw-tooth signal and the reference signal. Furthermore, the present invention also provides a full-range-duty PWM signal generation apparatus for an AC-to-DC power conversion, and a system using the full-range-duty PWM signal generation apparatus.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: September 13, 2011
    Assignee: Grenergy Opto, Inc.
    Inventor: Ko-Ming Lin
  • Patent number: 8014175
    Abstract: A switching power conversion circuit includes a power circuit, a feedback circuit and a control circuit. The power circuit includes a switching circuit and a first magnetic element. The first magnetic element generates a magnetic flux change by alternately conducting or shutting off the switching circuit, so that an input voltage is converted into the output voltage by the power circuit. The feedback circuit generates a feedback signal according to the output voltage. The control circuit is used for controlling an on duration and an off duration of the switching circuit, thereby maintaining the output voltage at a rated voltage. The off duration of the switching circuit is maintained at a constant interval under control of the control circuit. The on duration of the switching circuit is adjusted to be a specified interval smaller than a maximum on duration according to the magnitude of the input voltage.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: September 6, 2011
    Assignee: Delta Electronics, Inc.
    Inventors: Shih-Hsien Chang, Chih-Hsuan Lee
  • Publication number: 20110211373
    Abstract: An example controller for use in a power supply regulator includes a switch signal generator, a modulation circuit, and a multi-cycle modulator circuit. The modulation circuit modulates the duty cycle of a pulse width modulated switching signal to provide a fixed peak switching current in the switch during light load conditions and a variable peak switching current during load conditions other than the light load condition. The multi-cycle modulator circuit enables the switch signal generator to provide a switch signal uninterrupted if the load condition is other than the light load condition and disables the switch signal generator for a first time period and then enables the switch signal generator for a second time period when the load condition is the light load condition. The multi-cycle modulator circuit adjusts the first time period in response to the feedback signal to regulate the output.
    Type: Application
    Filed: May 6, 2011
    Publication date: September 1, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Balu Balakrishnan, Arthur B. Odell
  • Publication number: 20110211372
    Abstract: A compensation circuit has a resistor, a switch and a compensation capacitor. The resistor and the switch are connected in series between a power node and a compensation node. The compensation capacitor is connected to the compensation node, whose voltage is responsive to the output power source. For a predetermined period of time after the voltage falls below a predetermined value, the switch is open and no current flows through the resistor from the power node to the compensation node.
    Type: Application
    Filed: February 13, 2011
    Publication date: September 1, 2011
    Inventors: Da-Chun Wei, Wen-Chung Yeh
  • Publication number: 20110199795
    Abstract: A power converter is disclosed. An example power converter includes an energy transfer element coupled between a power converter input and a power converter output. A power switch is coupled to the energy transfer element. A control circuit is coupled to receive a feedback signal representative of the power converter output during a feedback portion of an off time of the power switch. The control circuit is coupled to generate an output signal in response to the feedback signal. The output signal is coupled to be received by the power switch to control switching of the power switch to control a fraction of the feedback portion of the off time of the power switch that the feedback signal is above a threshold and another fraction of the feedback portion of the off time of the power switch that the feedback signal is below the threshold.
    Type: Application
    Filed: March 25, 2011
    Publication date: August 18, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Chan Woong Park, Leif O. Lund
  • Publication number: 20110199796
    Abstract: An improved structure of a power supply is based on an emitter-switched PWM controller and special structure transformer. An improved structure of a power supply mainly describes two primary side regulation (here called “PSR”) solutions based on above PWM controller that is used in charger/adapter solutions. These PSR solutions employ a transformer with special winding structure. It is required that adjacent reeling between its input bias winding and output winding, in which the input side of the transformer is connected to an AC input and an emitter-switched PWM controller, and the output side of the transformer is connected to a rectified diode. The present invention further provides low cost PSR solutions with higher system reliability, better line/load regulation, and short circuit characteristic.
    Type: Application
    Filed: April 26, 2011
    Publication date: August 18, 2011
    Inventors: XIN WU, SHU-ZHUANG LU
  • Patent number: 8000114
    Abstract: An apparatus of regulating a power converter with multiple operating modes includes a switch coupled to an energy transfer element coupled between an input and an output of the power converter. A control circuit is also included, which is coupled to the switch to control the switch. The control circuit includes first and second duty cycle control modes to regulate power delivered to the output of the power converter. A transition between the first and second duty cycle control modes is responsive to a magnitude of a current flowing in the switch reaching a current threshold value.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: August 16, 2011
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Bäurle, Giao Pham
  • Patent number: 8000115
    Abstract: A flyback converter controller with forced primary regulation is disclosed. An example flyback converter controller includes a secondary control circuit to be coupled to a switched element coupled to a second winding of a coupled inductor of a flyback converter. The secondary control circuit is to be coupled across an output of the second winding to switch the switched element in response to a difference between an actual output value at the output of the second winding and a desired output value to force a current in a third winding of the coupled inductor that is representative of the difference between the actual output value at the output of the second winding and the desired output value. A primary control circuit is also included and is to be coupled to a primary switch coupled to a first winding of the coupled inductor. The primary control circuit is to be coupled to receive the current forced in the third winding by the secondary control circuit.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: August 16, 2011
    Assignee: Power Integrations, Inc.
    Inventors: William M. Polivka, Raymond Kenneth Orr
  • Publication number: 20110194315
    Abstract: A method of operation for flyback power converter includes operating a controller of the flyback power converter in a regulation mode when a control signal is below a first threshold. The control signal is provided as an input to a terminal of the flyback power converter. When the control signal is below a second threshold and above the first threshold, the controller is operated in a limiting mode. The controller is operated in an external command mode when the control signal is below a third threshold and above the second threshold. Lastly, when the control signal is above the third threshold, the controller is operated in a protection mode.
    Type: Application
    Filed: February 10, 2010
    Publication date: August 11, 2011
    Applicant: Power Integrations, Inc.
    Inventors: Yury Gaknoki, Tiziano Pastore, Mingming Mao, David Michael Hugh Matthews
  • Publication number: 20110194316
    Abstract: A switching power supply device including: a switching element which performs a switching operation; an output voltage generation circuit; a transformer reset detection circuit which generates a transformer reset signal; a secondary-side on-time signal generation circuit; a feedback control circuit which generates a feedback signal; a switching element drive circuit which controls the switching operation of the switching element according to the feedback signal; and an output voltage correcting signal generation circuit which generates an output voltage correcting signal from the feedback signal and a secondary-side on-time signal, and supplies the output voltage correcting signal to the feedback control circuit.
    Type: Application
    Filed: February 3, 2011
    Publication date: August 11, 2011
    Inventor: Naohiko MOROTA
  • Publication number: 20110187315
    Abstract: An embodiment of the present invention is directed to a power device for an electronic device, such as a charger for a portable rechargeable device and/or an AC adapter. The power device includes switching circuitry for de-powering at least a portion of the power device.
    Type: Application
    Filed: March 21, 2011
    Publication date: August 4, 2011
    Applicant: Volstar Technologies, Inc.
    Inventors: Valerie L. McGinley, Donald Rimdzius, James McGinley
  • Publication number: 20110157925
    Abstract: The present invention relates to an energy-saving power converter having a suspend mode. The power converter includes an output port for being electrically connected to the electricity consuming device; a voltage-transforming unit for outputting an output voltage appropriate to the needs of the electricity consuming device; a sensor for assessing the electricity consuming mode of the electricity consuming device, and a switch for selectively determining whether the sensor is to be powered. A wake-up unit is further provided to generate a wake-up signal for activating the voltage-transforming unit to provide power normally. The invention therefore solves the problem of unnecessary energy consumption resulted from a constant voltage conversion during the course when the electricity consuming device need not be supplied with power.
    Type: Application
    Filed: November 17, 2010
    Publication date: June 30, 2011
    Applicant: Kerio Technologies, Inc
    Inventor: Kuan Chun Wang
  • Publication number: 20110110125
    Abstract: An example integrated circuit for use in a power supply includes a switch, a terminal and a controller. The controller is coupled to control switching of the switch to regulate the output of the power supply in response to a feedback signal received at the terminal. The controller includes a comparator and an oscillator. The comparator is coupled to detect when a switch current through the switch exceeds a current limit and the oscillator is coupled to extend an off time of the switch in response to the comparator detecting that the switch current exceeds a current limit and if an on time of the switch is substantially equal to a sum of a leading edge blanking period and a current limit delay time period. The oscillator extends the off time of the switch independent of the feedback signal.
    Type: Application
    Filed: January 19, 2011
    Publication date: May 12, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Alex B. Djenguerian, Andrew J. Morrish
  • Publication number: 20110110124
    Abstract: In one embodiment, a power supply controller is configured to receive a sense signal (CS) having a negative value that is proportional to the input voltage. The power supply controller uses the sense signal to limit the switch (27) current through the switch responsively to the value of the input voltage.
    Type: Application
    Filed: July 23, 2008
    Publication date: May 12, 2011
    Inventors: Christophe Basso, Nicolas Cyr
  • Publication number: 20110110123
    Abstract: Embodiments of circuits and methods for a switching mode power supply are described in detail herein. In one embodiment, a switching mode power supply includes a transformer having a primary winding and a secondary winding to supply power to a load, a feedback circuit that generates a feedback signal that varies in relation to the load on the secondary winding, a switching circuit coupled to the primary winding to control current flow through the primary winding, and a control circuit coupled to the switching circuit to control the on/off status of switching circuit in response to the feedback signal and the current flow through the primary winding. The control circuit comprises a spectrum shaping circuit configured to generate a spectrum shaping signal in response to the feedback signal. The spectrum shaping signal can then be used to regulate the switching frequency and the spectrum shaping range.
    Type: Application
    Filed: November 11, 2010
    Publication date: May 12, 2011
    Inventors: En Li, Junming Zhang, Yuancheng Ren
  • Publication number: 20110103104
    Abstract: A power supply including an AC input, a filter, a full wave rectifier, a converter, a second rectifier, and a bias system. The filter includes at least one differential capacitor coupled to the AC input. The full wave rectifier develops a DC bus voltage on a DC bus node. The converter includes a controller and operates to convert the DC bus voltage to a regulated output voltage. The second rectifier is coupled to the AC input for developing a DC bias voltage on a DC bias node. The bias system is coupled between the DC bias node and a reference node and provides at least one start-up voltage to the controller, such as a supply voltage or a sense voltage or the like. The bias circuit includes at least one current discharge path for discharging each differential capacitor within a predetermined time period when AC line voltage is removed.
    Type: Application
    Filed: May 26, 2010
    Publication date: May 5, 2011
    Applicant: INTERSIL AMERICAS INC.
    Inventors: Xiaodong Zhan, Zhixiang Liang, Xiangxu Yu
  • Publication number: 20110103102
    Abstract: A voltage converter transmits energy in multiple stages using a charge pump so as to decrease the voltage rating of the secondary side of the transformer and reduce the size of the transformer. Meanwhile, the voltage converter stores and recycles the leakage inductance energy by using a snubber circuit so as to increase the efficiency.
    Type: Application
    Filed: February 22, 2010
    Publication date: May 5, 2011
    Inventors: Szu-Ming Chiang, Wei-Ming Chen, Chi-Hung Tsai
  • Publication number: 20110096573
    Abstract: Circuits and method for sensing a system output voltage change and transmitting an electrical signal to an auxiliary winding on the primary side. In an embodiment, a primary side controller detects the electrical signal and turns a power switch on and off to transfer energy from a primary winding to a secondary winding. A secondary side controller generates a voltage pulse at a terminal of the secondary winding when the system output voltage is below a reference voltage. The secondary side controller includes an input terminal connected to a system output, an output terminal connected to a terminal of the secondary winding, and a ground terminal connected to a ground potential of the system output.
    Type: Application
    Filed: October 23, 2009
    Publication date: April 28, 2011
    Applicant: BCD Semiconductor Manufacturing Limited
    Inventors: YaJiang Zhu, Jia Xie, Yongbo Zhang, Chao Chen, Shuzhuang Lv
  • Patent number: 7898826
    Abstract: An example power converter includes a power switch, a controller, and a current offset circuit. The controller is coupled to switch the power switch between an ON state and an OFF state to regulate an output of the power converter. The controller is adapted to terminate the ON state of the power switch in response to a switch current flowing through the power switch reaching a switch current threshold. The current offset circuit is coupled to generate an offset current in response to an input voltage of the power converter and an input current of the power converter is adjusted in response to the offset current.
    Type: Grant
    Filed: April 13, 2009
    Date of Patent: March 1, 2011
    Assignee: Power Integrations, Inc.
    Inventor: David Michael Hugh Matthews
  • Publication number: 20110044076
    Abstract: System and method for regulating an output voltage of a power conversion system. The system includes a sampling component located on a chip configured to receive an input voltage through a terminal. The sampling component is configured to sample the input voltage and generate a sampled voltage. Additionally, the system includes an error amplifier configured to process information associated with the sampled voltage and a threshold voltage and generate a first output signal, and a first signal generator configured to generate a second output signal and one or more third output signals. Moreover, the system includes a comparator configured to receive the first output signal and the second output signal and generate a comparison signal, and a gate driver directly or indirectly coupled to the comparator and configured to generate a drive signal based on at least information associated with the comparison signal.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 24, 2011
    Applicant: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Yunchao ZHANG, Lieyi Fang
  • Publication number: 20110038184
    Abstract: An isolated alternating current (AC)-direct current (DC) converter is disclosed. The isolated AC-DC converter comprises a slave control circuit including a slave driver module configured to receive a command and to control coupling of the slave control circuit to a primary-side inductor of a transformer based on the command, a master control circuit coupled to a secondary-side inductor of the transformer, the master control circuit including a master control module configured to sense a feedback voltage across a load and to generate the command based on the feedback voltage and a reference voltage, and a coupler configured to communicate the command from the master control module to the slave driver module and to provide isolation between the master control module and the slave driver module.
    Type: Application
    Filed: June 14, 2010
    Publication date: February 17, 2011
    Inventors: Sehat Sutardja, Ravishanker Krishnamoorthy, Wanfeng Zhang
  • Publication number: 20110038183
    Abstract: A switching regulator of a power converter is provided and includes a feedback-input circuit, a programming circuit, and a peak-current-threshold circuit. The feedback-input circuit is coupled to a terminal of the switching regulator for receiving a feedback signal. The feedback-input circuit is operated in a first range of a terminal signal. The programming circuit is coupled to the terminal for generating a programming signal. The programming signal is operated in a second range of the feedback signal. The peak-current-threshold circuit generates a threshold signal in accordance with the programming signal. The feedback signal is coupled to regulate the output of the power converter, and the threshold signal is coupled to limit a peak switching current of the power converter.
    Type: Application
    Filed: March 29, 2010
    Publication date: February 17, 2011
    Applicant: SYSTEM GENERAL CORPORATION
    Inventors: Ta-Yung Yang, Shao-Chun Huang, Chen-Hui Chan, Jenn-Yu G. Lin
  • Publication number: 20110019441
    Abstract: In one aspect, a power supply regulator includes a feedback terminal, a node, a control circuit, a first current source, and a second current source. The node is coupled to the feedback terminal to provide a feedback state signal in response to a feedback current through the feedback terminal. The feedback state signal has feedback states that represent an output of the power supply. The control circuit is to be coupled to a power switch and to receive the feedback state signal to regulate the output of the power supply. The first current source is coupled to the node to provide a first current to the node. The second current source is coupled to the node to selectively remove a second current from the node to modulate the feedback current and to alter the feedback state of the feedback state signal.
    Type: Application
    Filed: October 6, 2010
    Publication date: January 27, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
  • Patent number: 7876583
    Abstract: A flyback converter with forced primary regulation is disclosed. An example flyback converter includes a coupled inductor including a first winding, a second winding, and a third winding. The first winding is coupled to an input voltage and the second winding is coupled to an output of the power converter. A switched element is coupled to the second winding. A secondary control circuit is coupled to the switched element and the second winding. The secondary control circuit is coupled to switch the switched element in response to a difference between a desired output value and an actual output value to force a current in the third winding that is representative of the difference between the desired output value and the actual output value. A primary switch is coupled to the first winding. A primary control circuit is coupled to the primary switch and the third winding.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: January 25, 2011
    Assignee: Power Integrations, Inc.
    Inventors: William M. Polivka, Raymond Kenneth Orr
  • Patent number: 7872881
    Abstract: In one embodiment, a power supply includes a flyback transformer having a primary winding and at least two secondary windings. An output voltage is developed across a first one of the secondary windings. The power supply includes a transistor coupled to the first one of the secondary windings. The output voltage is regulated about a nominal output voltage by operating the transistor in a linear mode when current is flowing through the first one of the secondary windings and by operating the transistor in an off mode when current is not flowing through the first one of the secondary windings.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: January 18, 2011
    Assignee: ADC DSL Systems, Inc.
    Inventor: Randall L. Powers
  • Publication number: 20100328972
    Abstract: The present invention provides a voltage converter circuit for the clocked supply of energy to an energy storage based on an input voltage applied at an input applied at an input of the voltage converter circuit. The voltage converter circuit includes an energy storage and a switch arrangement, wherein the switch arrangement has a first switch and a second switch which are connected in parallel to each other and coupled to the energy storage. The first switch of the switch arrangement has a smaller turn-on voltage according to amount than the second switch, wherein a control terminal of the first switch is wired up such that the first switch is active in a startup phase of the voltage converter circuit to supply energy to the energy storage, and wherein a control terminal of the second switch is wired up such that the second switch is active after the startup phase to supply energy to the energy storage in a clocked way.
    Type: Application
    Filed: May 4, 2009
    Publication date: December 30, 2010
    Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Pollak, Loreto Mateu, Peter Spies
  • Patent number: 7859864
    Abstract: A switching power supply device has lower correction circuit losses, and enables adjustments without affecting overcurrent limiting or other characteristics. An integrated circuit IC for power supply control generates a switching signal based on a feedback signal from a feedback circuit and a voltage signal from a current detection input terminal, and outputs the switching signal from an output terminal to a switching element. A voltage controlled oscillator is provided which, when the load is judged to be light based on the magnitude of the feedback signal, lowers the switching frequency. The correction circuit is connected between the output terminal of the integrated circuit and the signal input terminal for current detection, acts only when the switching element is on, and has the function of further lowering the switching frequency set in the integrated circuit.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: December 28, 2010
    Assignee: Fuji Electric Systems Co., Ltd.
    Inventor: Hironobu Shiroyama
  • Patent number: 7859865
    Abstract: Techniques are disclosed to regulate an output of a power converter. One example power converter controller circuit includes a line sense input to be coupled to receive a signal representative of an input voltage of a power converter. A feedback input to be coupled to receive a feedback signal representative of an output of the power converter is also included. A drive signal generator is also included to generate a drive signal coupled to control switching of a switch to provide a regulated output parameter at the output of the power converter in response to the feedback signal. The drive signal generator is coupled to receive a plurality of inputs including the line sense input and the feedback input. The drive signal generator is coupled to latch the power converter into an off state in response to a detection of a fault condition in the power converter as detected by the plurality of inputs if the power converter input voltage is above a first threshold level.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: December 28, 2010
    Assignee: Power Integrations, Inc.
    Inventors: Stefan Bäurle, Alex B. Djenguerian, Kent Wong
  • Publication number: 20100321963
    Abstract: A semiconductor device providing a control circuit for controlling a switching power supply apparatus includes: an intermittent-oscillation control circuit which outputs an enable signal providing instructions to execute and suspend switching alternately; a turn-on control circuit which changes between an execution state and a suspension state of the switching according to the enable signal, and outputs, only in the execution state, a turn-on signal which turns on the switching element with a switching period; and an intermittent-oscillation frequency control circuit which causes the turn-on control circuit to delay the changing between the execution state and the suspension state so that an intermittence period including periods during which the turn-on control circuit is in the execution state and the turn-on control circuit is in the suspension state falls outside of a specific time range. Intermittent oscillation is thus operated out of a specific frequency band within an audible frequency range.
    Type: Application
    Filed: June 16, 2010
    Publication date: December 23, 2010
    Applicant: PANASONIC CORPORATION
    Inventor: Tetsuji Yamashita
  • Publication number: 20100302817
    Abstract: A DC-DC converter includes a plurality of switch elements connected in series between both ends of a DC power source, a series circuit of a primary winding of a transformer and a capacitor, connected between a connection point of the plurality of switch elements and an end of the DC power source, a rectifying-smoothing circuit to rectify and smooth a voltage generated by a secondary winding of the transformer into a DC voltage, and a controller to change a switching frequency of the plurality of switch elements according to a feedback signal generated from the DC voltage and alternately turn on/off the plurality of switch elements. The controller includes a nonlinear response unit 11a to nonlinearly change the switching frequency according to a feedback amount represented by the feedback signal.
    Type: Application
    Filed: May 17, 2010
    Publication date: December 2, 2010
    Applicant: Sanken Electric Co., Ltd.
    Inventor: Hiroshi Usui
  • Patent number: 7839662
    Abstract: A power supply having a flyback topology includes a flyback transformer and a current sense circuit that outputs a current signal indicative of a current output by the power supply. The current sense circuit includes a current sense transformer coupled to the flyback transformer.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: November 23, 2010
    Assignee: ADC DSL Systems, Inc.
    Inventors: Randall L. Powers, Christopher Tad Ammann
  • Patent number: 7808802
    Abstract: Embodiments disclosed herein describe an isolated switched-mode power supply with its output regulated from the primary side, by generating a sensing current using a sensing element coupled to the output of the power supply, and measuring a scaled version of the sensing current which depends on the output voltage, and calculating an estimate voltage representing the output voltage, and regulating the output of the isolated switched-mode power supply based on the estimate voltage.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: October 5, 2010
    Inventor: Jun Cai
  • Publication number: 20100220504
    Abstract: A power supply apparatus having multiple outputs is described. The power supply apparatus having multiple outputs which comprises a transformer, a first output circuit generating a first output voltage with respect to a power transferred to a secondary side of the transformer, and a first output controller generating a first control signal for controlling a power supply provided to a primary side of the transformer, includes: a second output circuit generating a second output voltage with respect to the power transferred to the secondary side of the transformer; and a second output controller controlling an output of the second output voltage, wherein the second output circuit includes a second switch performing a switching operation on current flows of the second output circuit, and the second output controller controls the switching operation of the second switch according to the first control signal and the second output voltage.
    Type: Application
    Filed: May 10, 2010
    Publication date: September 2, 2010
    Inventors: Jin-Ha Kim, Joong-Gi Kwon
  • Patent number: 7778049
    Abstract: A switching power supply is provided which keeps constant, even when the oscillation frequency of a switching element increases, the on duty of secondary current passing through a secondary winding, thereby achieving a constant current drooping characteristic with high accuracy. To be specific, a secondary current on-period detection circuit generates a signal indicating the off timing of the secondary current, based on a flyback voltage generated on an auxiliary winding. A secondary-current detection delay time correction circuit generates a signal indicating a time when a predetermined period has elapsed since the switching element is turned off. A secondary current on-duty control circuit generates a clock signal for turning on the switching element so as to keep constant the on duty of the secondary current, based on the signal generated by the secondary current on-period detection circuit and the signal generated by the secondary-current detection delay time correction circuit.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: August 17, 2010
    Assignee: Panasonic Corporation
    Inventor: Naohiko Morota
  • Patent number: 7777425
    Abstract: A multi-lamp backlight system is disclosed. The multi-lamp backlight system includes a plurality of lamps, an inverter circuit and a current balance circuit. The inverter circuit is capable of converting a DC input signal to a pair of AC output signals, which have a 180 degree phase shift. The pair of AC output signals are delivered to the plurality of lamps. The current balance circuit is connected to the low voltage sides of the plurality of lamps for balancing the lamp currents.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: August 17, 2010
    Assignee: O2Micro International Limited
    Inventors: Houng-Kuo Hsu, Chu-Chang Chen, Ching-Chuan Kuo
  • Publication number: 20100202166
    Abstract: A circuit to supply an AC voltage to a fluorescent lamp load from an AC supply converts the supply to DC, boosts the voltage in a converter and then drives an inverter from the smoothed boosted voltage in such a manner that the inverter will not start if the load is too low and the inverter frequency is almost constant. The power factor of the circuit is maintaining very close to unity.
    Type: Application
    Filed: April 15, 2008
    Publication date: August 12, 2010
    Applicant: ADVANCED ENVIRONMENTAL TECHNOLOGIES LIMITED
    Inventor: Mohamed Sirajjudin
  • Patent number: 7773393
    Abstract: A switching mode power supply includes a power supply circuit, a feedback circuit, and a switching controller. The power supply circuit includes a main switch coupled to a primary coil of a transformer, and supplies power to a secondary coil of the transformer according to an operation of the main switch. The feedback circuit generates a feedback voltage corresponding to an output voltage provided to the secondary coil of the transformer. The switching controller controls the main switch to turn off according to a sense voltage corresponding to the current flowed by the main switch. In this instance, the switching controller quickly senses the output short phenomenon by using the duty ratio of the main switch and the feedback voltage and shuts down the main switch to protect the circuit.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: August 10, 2010
    Assignee: Fairchild Korea Semiconductor, Ltd.
    Inventor: Hang-Seok Choi