Patents Examined by Emily Pham
  • Patent number: 8787043
    Abstract: A controller for a power converter and method of operating the same. In one embodiment, the controller includes a primary peak current circuit configured to produce a reference voltage corresponding to a primary peak current through a primary winding of a transformer of a power converter, and an offset corrector configured to provide an offset voltage to compensate for delays in the power converter. The controller also includes a summer configured to provide an offset reference voltage as a function of the reference voltage and the offset voltage, and a comparator configured to produce a signal to turn off a power switch coupled to the primary winding of the transformer as a function of the offset reference voltage.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: July 22, 2014
    Assignee: Power Systems Technologies, Ltd.
    Inventor: Ralf Schroeder genannt Berghegger
  • Patent number: 8587286
    Abstract: One object of the present invention is to provide a regulator circuit with an improved noise margin. In a regulator circuit including a bias circuit generating a reference voltage on the basis of the potential difference between a first power supply terminal and a second power supply terminal, and a voltage regulator outputting a potential to an output terminal on the basis of a reference potential input from the bias circuit, a bypass capacitor is provided between a power supply terminal and a node to which a gate of a transistor included in the bias circuit is connected.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: November 19, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Hiroki Inoue, Kiyoshi Kato, Shuhei Nagatsuka, Koichiro Kamata, Tsutomu Murakawa, Takahiro Tuji, Kaori Ikada
  • Patent number: 8582271
    Abstract: A power supply device is described comprising a DC voltage supply, a power section connected to the DC supply for supplying DC power from the DC voltage supply to first and second outlet ports for connection to a remote device via a cable connection, a voltage boosting circuit for generating a voltage above that of the DC supply, an energy absorbing circuit connected between an output of the voltage boosting circuit and a ground potential, and a diode connection means between the first outlet port and the energy absorbing circuit. The major components of the power supply device may be implemented as an integrated circuit.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: November 12, 2013
    Assignee: Broadcom Corporation
    Inventors: Jacques Bertin, Luc D'Haeze
  • Patent number: 8570021
    Abstract: A DC/DC converter includes a first comparator configured to compare an output voltage to a reference voltage; a pulse generator circuit configured to generate a pulse signal when triggered by an output signal from the first comparator; a first switch circuit configured to open and close on the basis of the pulse signal; an output voltage generator configured to generate the output voltage on the basis of an input voltage supplied via the first switch circuit; a delay generator circuit configured to delay the output signal from the first comparator before outputting; and an error amplifier configured to control a delay time of the delay generator circuit on the basis of a potential difference between the output voltage and the reference voltage.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: October 29, 2013
    Assignee: Spansion LLC
    Inventor: Takahiro Yoshino
  • Patent number: 8564274
    Abstract: An improved reference voltage (Vref) generator useable, for example, in sensing data on single-ended channels is disclosed. The Vref generator can be placed on the integrated circuit containing the receivers, or may be placed off chip. In one embodiment, the Vref generator comprises an adjustable-resistance voltage divider in combination with a current source. The voltage divider is referenced to I/O power supplies Vddq and Vssq, with Vref being generated at a node intervening between the adjustable resistances of the voltage divider. The current source injects a current into the Vref node and into a non-varying Thevenin equivalent resistance formed of the same resistors used in the voltage divider. So constructed, the voltage generated equals the sum of two terms: a first term comprising the slope between Vref and Vddq, and a second term comprising a Vref offset.
    Type: Grant
    Filed: January 24, 2009
    Date of Patent: October 22, 2013
    Assignee: Micron Technology, Inc.
    Inventors: Dragos Dimitriu, Timothy M. Hollis
  • Patent number: 8564257
    Abstract: The present invention relates to a power factor correction circuit and a driving method thereof. The power factor correction circuit includes a power switch controlling an inductor current flowing in an inductor, an auxiliary inductor coupled to the inductor with a predetermined turn ratio, and a power factor correction controller controlling output power by controlling a switching operation of the power switch. The power factor correction controller determines whether or not an output voltage of the output power is an over-voltage by using the sum of a source current and a sink current that control a zero current detection voltage to be included within a predetermined clamping range, the zero current detection voltage corresponding to an auxiliary voltage that is a both-end voltage of an auxiliary inductor.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: October 22, 2013
    Assignee: Fairchild Korea Semiconductor Ltd.
    Inventors: Young-Bae Park, Sang Cheol Moon, Byoung Heon Kim, Byung Kwon Choi, Cheng Sung Chen
  • Patent number: 8564979
    Abstract: The invention includes a high-voltage power supply connected, by a network input, to an AC network of frequency Fr, with n phases, and providing a high DC output voltage at at least one HV output. The power supply includes a single-phase high-voltage conversion module per phase of the network having a current rectification circuit connected, by a single-phase input of the conversion module, to a respective phase of the network and, by a rectified-current output, to a switching circuit having at least one switching transistor for switching the rectified current at a frequency Fd and p secondary HV circuits, each providing a secondary, p being an integer greater than or equal to 1, j being the rank of the secondary HV circuit ranging between 1 and p. A control and regulation unit for the power supply comprises a control circuit per conversion module.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: October 22, 2013
    Assignee: Thales
    Inventor: Claudio Capogna
  • Patent number: 8537571
    Abstract: A power supply device comprises a capacitance (Ca) consisting of an overhead power line (100) and an electrode (20) extending in the longitudinal direction of the overhead power line (100) via an insulator (30), an inductance (La) connected in parallel with the capacitance (Ca), and an output portion (50) led out from both ends of a parallel circuit including the capacitance (Ca) and the inductance (La). The parallel circuit is operated as a parallel resonant circuit and power is supplied from the output portion (50), thereby obtaining a compact and simple structure and improving power supply efficiency to a load as compared with a conventional power supply device.
    Type: Grant
    Filed: November 28, 2008
    Date of Patent: September 17, 2013
    Assignee: Dyden Corporation
    Inventors: Kouji Terasaki, Hidenori Oda, Hiroaki Kamohara
  • Patent number: 8525501
    Abstract: A power factor correction device includes a rectifier for converting an AC input voltage into a DC input voltage, an output module for generating and outputting a DC output voltage, an intermediate inductor coupled between the rectifier and the output module, a power switch for controlling an inductor current of the intermediate inductor and generating a source voltage, a reset module for generating a reset instruction according to the DC input voltage, the DC output voltage and the source voltage, an SR flip-flop for outputting a latch result according to a set instruction and the reset instruction, and a set module for generating the set instruction in response to variation of the intermediate inductor or variation of the latch result.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: September 3, 2013
    Assignee: NOVATEK Microelectrics Corp.
    Inventors: Chih-Yuan Hsieh, Hsiang-Yi Chiu
  • Patent number: 8519687
    Abstract: A power source device capable of improving the power conversion efficiency at a light load independent of an input power source voltage is realized. For example, a clock signal is output from a common control unit to a PWM-mounted drive unit including a reverse-current detection circuit in addition to a peak current control method. This clock signal is selected by a mode setting signal from either of a clock signal with a constant frequency or a clock signal which is generated via a one-shot pulse generation circuit every time an output voltage at an output power source node decreases. When the latter is selected, the switching frequency at a light load decreases and the power conversion efficiency improves. Furthermore, the peak current control method can reduce the input power source voltage dependence of the switching frequency.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: August 27, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Ryotaro Kudo
  • Patent number: 8519695
    Abstract: One of the objects of the present invention is to suppress variations in the frequency response of a feedback circuit due to variations in the value of a passive element in an error amplifier. One of the embodiments of the present invention provides a configuration allowing the frequency response of a feedback circuit in an error amplifier to be determined by not only the value of a passive element but the gain of an active element. This error amplifier includes a voltage-to-current converter which is an active element. In addition, a first terminal, a second terminal, an operational amplifier, a first resistor, a second resistor, first to fifth transistors, a first current source, and a second current source can be built into an integrated circuit, and a capacitor can be externally provided.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: August 27, 2013
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventor: Yoshiaki Ito
  • Patent number: 8513927
    Abstract: A power generation circuit has one of an antenna or a coil that receives an ambient radio wave. A rectifying circuit is connected to the antenna or the coil for rectifying a signal from the antenna or the coil receiving the ambient radio wave. A booster circuit is connected to and boosts an output of the rectifying circuit. A storage circuit is connected to the booster circuit and stores an output power obtained from the rectifying circuit for driving a load without the use of a power source or a battery. A switching circuit is operable in an ON-state thereof to connect the storage circuit to the load when a voltage of the storage circuit is equal to or greater than a preselected voltage.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: August 20, 2013
    Assignees: Seiko Instruments Inc.
    Inventors: Makoto Ishida, Kazuaki Sawada, Hidekuni Takao, Minoru Sudo
  • Patent number: 8508200
    Abstract: A power supply circuit comprises a power transistor, a differential amplifier, an I/V converter circuit, and an inverting amplifier, wherein the differential amplifier comprises a first current path in which a first resistor element, a first current mirror transistor, and a first control transistor are connected in series, and a second current path in which a second resistor element, a second current mirror transistor, and a second control transistor are connected in series, and the power supply circuit comprises a phase compensating capacitor element connected in parallel with the inverting amplifier, and a ripple removal rate improving capacitor element which is connected between ground and a connection point between the first resistor element and the first current mirror transistor, or between the ground and a connection point between the second resistor element and the second current mirror transistor.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: August 13, 2013
    Assignees: Semiconductor Components Industries, LLC, Sanyo Semiconductor Co., Ltd.
    Inventors: Ryuji Yamamoto, Yuichi Inakawa
  • Patent number: 8508966
    Abstract: Provided are semiconductor elements 107A, 107B, and 107C that allow a current to flow that is at most a maximum current determined by the level of control signals VGA, VGB, and VGC and that depends on the difference between the voltage of a DC power supply BA and the charging voltage of a capacitor 102, a controller 105 that outputs a control signal to each semiconductor element, and a temperature detection circuit that detects the temperature of each semiconductor element. Until a predetermined time elapses after the electric circuit is closed, the controller 105 adjusts the level of each control signal based on the temperature detected by the temperature detection circuit so that current through the electric circuit does not exceed a current limit, and after the predetermined time period elapses, the controller 105 adjusts the level of each control signal so that current through the electric circuit is allowed to exceed the current limit.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: August 13, 2013
    Assignee: Panasonic Corporation
    Inventor: Masaki Tagome
  • Patent number: 8503195
    Abstract: An open loop half-bridge power converter is provided for effective zero volt switching during all operating conditions, the converter including: an oscillating inverter circuit having a pair of switches coupled to a load circuit; an inverter drive circuit effective to provide driver signals to the inverter circuit; and a control circuit for providing control signals to the drive circuit. The control circuit is configured to increase a switching frequency of the switching devices in response to a predetermined condition such as startup or short circuit conditions. The inverter as a result continues to operate at a full duty cycle in response to the increased switching frequency, and zero volt switching is ensured throughout the duration of the predetermined condition.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: August 6, 2013
    Assignee: Power-One, Inc.
    Inventor: Igor Mogilevski
  • Patent number: 8502519
    Abstract: A reference voltage that is consistent over various operational conditions and uses low power is provided. According to an example, an internal temperature-compensated voltage (e.g., vdd_int in 200) is generated from a power supply (e.g., vdd in 200), and a reference voltage (e.g., vref in 200) is generated from the internal voltage. The reference voltage is stored on a storage circuit (e.g., 430) that is coupled (charged) and refreshed under conditions, relative to circuit characteristics, that make low and ultra-low power operation possible.
    Type: Grant
    Filed: November 27, 2008
    Date of Patent: August 6, 2013
    Assignee: NXP B.V.
    Inventor: Friedbert Riedel
  • Patent number: 8503201
    Abstract: Systems and methods of operating a voltage converter are provided. The converter includes an output inductor and an output capacitor coupled to a rectifier circuit. The converter also includes a clamp circuit having a clamping diode and a clamping capacitor coupled in series, with the serial combination in parallel with the output inductor. The clamp circuit can also include a recovery inductor coupled to the output capacitor, and a switch configured to selectively couple and decouple the recovery inductor in parallel with the clamping capacitor.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: August 6, 2013
    Assignee: Schneider Electric IT Corporation
    Inventor: David E. Reilly
  • Patent number: 8502508
    Abstract: A switching regulator circuit for achieving stepping-up or stepping-down, including a basic circuit and an inductor connected to the basic circuit. The basic circuit includes a switching circuit to perform switching, a control circuit to control the switching circuit, a first terminal connected to one end of the inductor and the switching circuit, and second and third terminals connected to the switching circuit. When the input voltage is stepped up, the control circuit causes the switching circuit to charge the inductor via the first terminal and the third terminal and to discharge the inductor via the first terminal and the second terminal. When the input voltage is stepped down, the control circuit causes the switching circuit to charge the inductor via the first terminal and the second terminal and to discharge the inductor via the first terminal and the third terminal.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: August 6, 2013
    Assignee: Ricoh Company, Ltd.
    Inventor: Ippei Noda
  • Patent number: 8497670
    Abstract: A charge pump regulator circuit includes a voltage controlled oscillator and a plurality of charge pumps. The voltage controlled oscillator has a plurality of inverter stages connected in series in a ring. A plurality of oscillating signals is generated from outputs of the inverter stages. Each oscillating signal has a frequency or amplitude or both that are variable dependent on a variable drive voltage. Each oscillating signal is phase shifted from a preceding oscillating signal. Each charge pump is connected to a corresponding one of the inverter stages to receive the oscillating signal produced by that inverter stage. Each charge pump outputs a voltage and current. The output of each charge pump is phase shifted from the outputs of other charge pumps. A combination of the currents thus produced is provided at about a voltage level to the load.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: July 30, 2013
    Assignee: IO Semiconductor, Inc.
    Inventors: Stuart B. Molin, Perry Lou, Clint Kemerling
  • Patent number: 8498134
    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: Grant
    Filed: May 4, 2009
    Date of Patent: July 30, 2013
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung e.V.
    Inventors: Markus Pollak, Loreto Mateu, Peter Spies