With Starting Arrangement Patents (Class 363/49)
  • Publication number: 20130039101
    Abstract: A switching power supply apparatus including an AC-to-DC conversion circuit, a hysteretic relay and a relay control circuit is provided. The AC-to-DC conversion circuit includes a current limit resistor, and the current limit resistor is configured to suppress an inrush current generated during the AC-to-DC conversion circuit converts an AC input voltage into a DC output voltage. The hysteretic relay is coupled with the current limit resistor in parallel. The relay control circuit is coupled to the AC-to-DC conversion circuit and the hysteretic relay, and configured to control the hysteretic relay to turn on in response to one of an over drive pulse signal and a holding modulation signal when the DC output voltage reaches to a predetermined value, so as to bypass the current limit resistor, wherein an enabling time of the over drive pulse signal is different from that of the holding modulation signal.
    Type: Application
    Filed: August 10, 2012
    Publication date: February 14, 2013
    Applicant: FSP TECHNOLOGY INC.
    Inventors: Hua-Ming Lu, Kuo-Fan Lin
  • Publication number: 20130033211
    Abstract: Disclosed include switching-mode power supplies and control methods thereof. A disclosed switching-mode power supply is coupled to an input power node and a ground node, comprising a controller, a first inductor, and a bootstrap circuit. The controller is for controlling a power switch coupled to the input power node and a connection node. The controller is powered by the connection node and an operation power node. The first inductor is coupled between the connection node and a discharge node. The bootstrap circuit is coupled between the discharge node, the operation power node and the connection node, to make an operation voltage at the operation power node substantially not less than a discharge voltage at the discharge node. The discharge node is coupled to power an output load.
    Type: Application
    Filed: September 24, 2011
    Publication date: February 7, 2013
    Applicant: SHAMROCK MICRO DEVICES CORP.
    Inventors: Chien-Liang Lin, Wen-Chung Yeh
  • Patent number: 8363436
    Abstract: A start up circuit constituted of: a first alternating current lead; a second alternating current lead, said second alternating current lead exhibiting an opposing phase of said first alternating current lead; a first capacitor, a first end of said first capacitor coupled to said first alternating current lead; a second capacitor, a first end of said second capacitor coupled to said second alternating current lead; a breakdown diode coupled between a second end of said first capacitor and a second end of said second capacitor; and a third capacitor coupled in parallel with said breakdown diode. A direct current power is developed across the breakdown diode without requiring dissipative elements.
    Type: Grant
    Filed: December 5, 2010
    Date of Patent: January 29, 2013
    Assignee: Microsemi Corporation
    Inventors: Shiju Wang, Chien Nguyen, Hwangsoo Choi
  • Patent number: 8363435
    Abstract: A digital device generates a fixed duty cycle signal with an internal oscillator after a Power-On-Reset (POR). This fixed duty cycle signal is output on a signal pin that normally is used for a PWM control signal. The fixed duty cycle signal is used to stimulate the voltage generation circuits so as to power up the digital device for initialization thereof. Once the digital device has powered-up and initialized, the digital device switches over to normal operation for control of the power system.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: January 29, 2013
    Assignee: Microchip Technology Incorporated
    Inventors: Bryan Kris, Sagar Khare, Mohammad Kamil
  • Publication number: 20130016540
    Abstract: The invention relates to a power converter comprising: a DC power supply bus comprising a positive power supply line (10) and negative power supply line (11), a limiting resistor (RL) connected in series with the negative power supply line (11) of the DC power supply bus, designed to limit the charging current of the bus capacitor (Cbus), an inverter module comprising upper transistors (T2, T4, T6) and lower transistors (T1, T3, T5) in series of the normally ON field-effect type, several Grid control devices (CT1-CT6) allowing each to apply a Grid voltage to the transistors for controlling each transistor so as to turn off or to turn on, a start-up source (Sd) connected in parallel with the limiting resistor (RL) and to each Grid control device (CT1, CT3, CT5) for the lower transistors (T1, T3, T5) and configured for charging with a negative voltage when the power converter starts up.
    Type: Application
    Filed: June 21, 2012
    Publication date: January 17, 2013
    Applicant: Schneider Toshiba Inverter Europe SAS
    Inventor: Allan Pierre BARAUNA
  • Publication number: 20130003428
    Abstract: An exemplary power supply system is used to provide one or more operation voltages to a plurality of loads individually. The power supply system includes a timing circuit configured to control a starting time that the corresponding loads start to receive their corresponding operation voltages. The timing circuit includes a first capacitor arranged to be charged by the corresponding DC voltage, and the starting time is determined according to a charging characteristic of the first capacitor.
    Type: Application
    Filed: May 30, 2012
    Publication date: January 3, 2013
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.
    Inventors: LU-QING MENG, HAI-LONG CHENG, YONG-SONG SHI, KUO-PIN LIN, CHUN-LUNG HUNG
  • Patent number: 8339809
    Abstract: A switching power supply device includes a transformer, a switching unit which is connected with a primary winding of the transformer and configured to switch a current flowing to the primary winding, a start unit configured to start the switching unit, a voltage drop unit configured to lower output voltage from a secondary winding of the transform, and a current control unit configured to control an amount of a current flowing in the start unit when the switching unit is in an off state by lowering output voltage by the voltage drop unit.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: December 25, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yasuhiro Nakata
  • Publication number: 20120314462
    Abstract: An offline power supply includes a power supply circuit including a primary-side circuit for connecting to a first power source, a secondary-side circuit for connecting to a load, and a transformer connecting the primary-side circuit and the secondary-side circuit. A switch operates to selectively connect the primary-side circuit to the first power source. A second power source is charged during operation of the power supply circuit. A controller powered by the second power source has at least one input, and an output to selectively operate the switch based on the at least one input.
    Type: Application
    Filed: June 8, 2011
    Publication date: December 13, 2012
    Applicant: LEAR CORPORATION
    Inventors: Benjamin D. Sweet, Krzysztof Klesyk
  • Publication number: 20120310438
    Abstract: A method for initializing a power inverter of a photovoltaic system includes: opening an AC mains switch and a DC switch to disconnect the power inverter from an electrical grid and to disconnect a capacitor bank associated with the inverter from a solar cell array; closing the AC mains switch to allow power to flow from an electrical grid to the DC capacitor bank to charge the DC capacitor bank; monitoring the DC capacitor bank until a desired voltage is reached; initiating the operation of the power inverter; stabilizing the DC voltage received from the DC capacitor bank at a predetermined power up voltage for the power inverter; waiting for an inverter initialization period to elapse; and adjusting DC voltage received by the power inverter to a voltage associated with a maximum power output level of the solar cell array.
    Type: Application
    Filed: June 13, 2011
    Publication date: December 6, 2012
    Inventor: Karl Kaiser
  • Patent number: 8324756
    Abstract: A power management (PM) system architecture for a controlled SoC detects availability of power supply for signal-driving at a given node inside a chip, and uses a timer, a discharge mechanism with trigger for starting/stopping a discharge process, and a comparator for monitoring a measured voltage of an intended node during the discharge process. Enabling the discharge mechanism for a known time period helps detection. Power supply can be internally generated in the chip or from a source on board. The architecture detects if the node is driven or floating, an undriven floating node causing a dip in the measured voltage. The measured voltage does not have a dip when the node is driven. The architecture is also configured so that when there is a required on-board external power supply, an internal power supply is disabled to avoid a race-condition. The architecture obviates a dedicated IO pin for mode-indication.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: December 4, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Ranjit Kumar Dash, Lakshmanan Balasubramanian, Anand Devendra Kudari
  • Patent number: 8325502
    Abstract: An embodiment of a self-supply circuit, for a voltage converter that converts an input voltage into an output voltage and has a main switch and a controller, designed to control switching of the main switch for controlling the output voltage; the self-supply circuit is provided with: a charge accumulator, which is connected to the controller and supplies a self-supply voltage to the same controller; a generator, which supplies a charge current to the charge accumulator; and an auxiliary switch, which has a first conduction terminal in common with a respective conduction terminal of the main switch and is operable so as to control transfer of the charge current to the charge accumulator. In particular, the self-supply circuit is provided with a precharge stage, connected to the auxiliary switch, which carries out a precharging of an intrinsic capacitance of the auxiliary switch before a turning-off transient of the main switch ends.
    Type: Grant
    Filed: November 26, 2008
    Date of Patent: December 4, 2012
    Assignee: STMicroelectronincs S.r.l.
    Inventors: Salvatore Giombanco, Salvatore Tumminaro
  • Publication number: 20120294052
    Abstract: The power conversion module includes a power converter coupled to provide a DC output voltage from an input voltage source. The power converter may have primary and secondary stages, and the power converter may also provide a DC output voltage that is electrically isolated from the input voltage source. Additionally, the power conversion module also includes a voltage controller configured to measure a pre-bias value of the output voltage prior to start-up of the power converter and provide a start-up control signal, wherein the start-up control signal corresponds to an initial output voltage that is greater than the pre-bias value of the output voltage. The initial output voltage includes a start-up voltage margin above the pre-bias value and is maintained for a margin hold time. A method of operating a power conversion module is also provided.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 22, 2012
    Applicant: General Electric Co.
    Inventors: Raghothama Reddy, Stephen Guthrie, Subarna Pal
  • Publication number: 20120294051
    Abstract: A system including a power transistor configured to receive an alternating current (AC) line voltage and a control circuit. During a rising portion of a half cycle of the AC line voltage, the control circuit is configured to turn on the power transistor when the AC line voltage reaches a first value and turn off the power transistor when the AC line voltage reaches a second value. The second value is greater than the first value. During a falling portion of the half cycle, the control circuit is configured to turn on the power transistor when the AC line voltage reaches the second value and turn off the power transistor when the AC line voltage reaches the first value.
    Type: Application
    Filed: April 18, 2012
    Publication date: November 22, 2012
    Inventors: Ravishanker Krishnamoorthy, Radu Pitigoi-Aron, Siew Yong Chui
  • Patent number: 8315074
    Abstract: The present abstract discloses a CMOS bandgap reference source circuit, comprising a startup circuit, a power-off control circuit, a reference voltage generating circuit and an operational amplifier. The positive and a negative input terminal of the operational amplifier both consist of two same field effect transistors and both are provided with an input controlled switch; by doing so, two field effect transistors in the positive terminal and two field effect transistors in the negative terminal work alternately between their strong inversion and cut-off region so as to drastically reduce the noises of the reference circuit, which results originally from the flicker noises of two input transistors of the operational amplifier.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: November 20, 2012
    Assignee: IPGoal Microelectronics (Sichuan) Co., Ltd.
    Inventor: Guojun Zhu
  • Publication number: 20120287685
    Abstract: A converter may include a start-up circuit having a switch circuit coupled to a reference potential terminal and an input circuit coupled to an input voltage, wherein the input circuit is coupled to the start-up circuit such that in case that at least one of the input voltage is lower than a predetermined threshold and that the input voltage is substantially constant for a predefined time period, electrical charges stored in the input circuit are flowing through the switch circuit to the reference potential terminal.
    Type: Application
    Filed: May 9, 2011
    Publication date: November 15, 2012
    Applicant: INFINEON TECHNOLOGIES AG
    Inventor: Marc Fahlenkamp
  • Publication number: 20120287684
    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: Application
    Filed: May 9, 2011
    Publication date: November 15, 2012
    Applicant: INFINEON TECHNOLOGIES AG
    Inventor: Marc Fahlenkamp
  • Patent number: 8305001
    Abstract: A light-emitting diode driver circuit includes: a first-rectifier circuit to output a first-rectified voltage; a transformer including primary and secondary coils and an auxiliary coil inductively coupled to the primary or secondary coils, the primary coil being applied with the first-rectified voltage; a transistor connected in series to the primary coil; a second-rectifier circuit to output a second-rectified voltage obtained by rectifying a voltage generated in the auxiliary coil; a capacitor to be charged with the second-rectified voltage; and a control circuit to control on and off of the transistor based on a charging voltage of the capacitor so that the charging voltage becomes equal to a predetermined voltage, the secondary coil outputting a voltage that varies with a frequency corresponding to a frequency of the first-rectified voltage and that corresponds to a turns ratio between the primary and secondary coils, as a voltage for driving a light-emitting diode.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: November 6, 2012
    Assignees: Semiconductor Components Industries, LLC, Sanyo Semiconductor Co., Ltd.
    Inventors: Fumio Horiuchi, Toru Imaizumi, Takaya Kusabe
  • Patent number: 8300435
    Abstract: An HVDC transmission system including a rectifier station and an inverter station each having a series connection of at least two converters. A by-pass DC breaker is connected in parallel with each converter. A control device is adapted to deblock a blocked converter by starting to control the converter at high delay angle and gradually decreasing the delay angle until substantially all DC current flows through the converter and to then control the by-pass breaker to open at substantially zero current, and to stop the operation of a converter by controlling the converter at gradually increasing delay angle until the voltage across the converter is substantially zero and to then control the converter to be blocked by firing a by-pass pair thereof and to then control the by-pass breaker to close for taking over all the DC current when the voltage between a neutral bus and a pole of a transmission line between the stations is to be increased and reduced, respectively.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: October 30, 2012
    Assignee: ABB Technology Ltd.
    Inventors: Hans Björklund, Rolf Lungqvist
  • Publication number: 20120257426
    Abstract: The AC adapter with automatic built-in power switch comprises of an AC power supply circuit, an AC control circuit, and a monitoring circuit. The monitoring circuit further comprises of a standby power supply, a microcontroller, a circuit for device detection, and a current monitor circuit. The AC power supply circuit is electrically connected to the alternating current source and converts the alternating current to direct current for charging the rechargeable battery of an electronic device. The AC control circuit acts as a switch to turn the AC power supply on and off. The monitor circuit detects whether an electronic device is connected to the adapter and also whether the charging process is completed.
    Type: Application
    Filed: April 11, 2011
    Publication date: October 11, 2012
    Applicant: EVER WIN INTERNATIONAL CORPORATION
    Inventor: Arthur L. Serrano
  • Publication number: 20120250376
    Abstract: An AC-DC power converter has a phase-shifting autotransformer based rectifiers and DC capacitors. Soft start of the AC-DC power converter is achieved by designing the autotransformer to operate at a low peak flux density at a point of AC voltage step application (initial turn on). The addition of a controlled impedance segregates capacitor charging from the initial magnetizing process of the autotransformer.
    Type: Application
    Filed: April 4, 2011
    Publication date: October 4, 2012
    Inventors: Frank Z. Feng, Barry John Parker
  • Patent number: 8279643
    Abstract: An integrated circuit includes a threshold detection circuit that is coupled to measure a signal from a first resistive external circuit coupled between a fourth external terminal of the integrated circuit and a first external terminal of the integrated circuit during a duration of an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period of the integrated circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the signal measured from the first resistive external circuit during the duration of the initialization period after the fourth external terminal has been charged to the supply threshold value.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: October 2, 2012
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8278857
    Abstract: A motor control device is electrically connected with a motor. The motor control device includes a controller and a driving circuit. The controller has a default value of time and generates a first driving signal and a second driving signal. The driving circuit includes a first switching element and a second switching element, the first switching element and the second switching element receive the first driving signal and the second driving signal respectively, and the first switching element and the second switching element are switched on or switched off alternately according to the first driving signal and the second driving signal respectively, so as to drive the motor to operate.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: October 2, 2012
    Assignee: Delta Electronics, Inc.
    Inventors: Yu-Liang Lin, Ming-Yen Lin, Chia-Wen Kuo, Kuan-Ting Lee
  • Patent number: 8278887
    Abstract: A DC/DC converter including an inductor and a capacitor is started by connecting an input voltage to the inductor and shunting a current around the inductor so as to pre-charge the capacitor to a predetermined voltage.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: October 2, 2012
    Assignee: Advanced Analogic Technologies, Inc.
    Inventor: Richard K. Williams
  • Patent number: 8274799
    Abstract: A resonant mode power converter is controlled with a control unit including a current limiting circuit coupled to receive a first current representative of a power converter output and a second current generated in response to a reference voltage. The current limiting circuit is coupled to limit the first current in response to the second current. An oscillator is coupled to receive the first current to generate a control signal having a control frequency in response to the first current. The power converter output is controlled in response to the control frequency of the control signal.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: September 25, 2012
    Assignee: Power Integrations, Inc.
    Inventors: Anthony Reinberger, Paul Demone
  • Publication number: 20120236609
    Abstract: Disclosed is an apparatus for reducing standby power, which is capable of minimizing standby power losses by using an electric double layer capacitor (ELDC). The apparatus includes: an electric double layer capacitor for converting electrical energy supplied from the AC power source into DC power and storing the converted electrical energy; a charging circuit for charging the electrical energy in the electric double layer capacitor; a voltage conversion circuit for converting the electrical energy charged in the electrical double layer capacitor into a stable voltage; a voltage detection circuit for detecting a charged voltage of the electric double layer capacitor; and a power supply control circuit for turning on/off a power switch in response to a command from the voltage detection circuit, wherein the power supply control circuit uses the electrical energy charged in the electrical double layer capacitor to turn on/off the power switch.
    Type: Application
    Filed: October 21, 2010
    Publication date: September 20, 2012
    Applicant: Korchip Corporation
    Inventors: Soon Joo Choi, Jin Hyung Son
  • Publication number: 20120230069
    Abstract: A startup control circuit with an acceleration startup function and a method for operating the same are disclosed. The startup control circuit is applied to a power supply. A power switch, which is coupled to a primary-side winding of a transformer, is switched to control the transformer, thus adjusting the output voltage of the power supply. The startup control circuit mainly includes a capacitor and a startup control apparatus. The startup control apparatus includes an enable switch unit and a power control unit. By turning on and turning off the enable switch unit of the startup control apparatus, the acceleration startup control and the stable output power of the power supply can be implemented.
    Type: Application
    Filed: July 22, 2011
    Publication date: September 13, 2012
    Inventors: Ren-Huei TZENG, Ching-Hao Li, Jian-He Li
  • Patent number: 8237420
    Abstract: An inrush current suppressing circuit connected between a power supply and a working circuit of an electronic device includes a first power supply circuit and a second power supply circuit both connected between the power supply and the working circuit. The first power supply circuit suppresses inrush current and forwards power from the power supply to the working circuit when the electronic device is powered on. The second power supply circuit forwards power from the power supply to the working circuit when the power supply reaches a predetermined voltage.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: August 7, 2012
    Assignees: Ambit Microsystems (Shanghai) Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventor: An Liu
  • Patent number: 8223513
    Abstract: An inverter includes a pulse width modulation (PWM) circuit, a direct current (DC) voltage input terminal, a storage capacitor, a first transformer, a soft start circuit, and a first transistor. The PWM circuit includes a first output terminal. The first transformer includes a first primary winding. The first primary winding includes a first terminal and a second terminal capable of being grounded via the storage capacitor. The soft start circuit includes an inductor and a first capacitor. A gate electrode of the first transistor is connected to the first output terminal. A source electrode of the first transistor is connected to the first terminal of the first transformer via the inductor. A drain electrode of the first transistor is connected to the DC voltage input terminal and connected to the source electrode via the capacitor.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: July 17, 2012
    Assignees: Innocom Technology (Shenzhen) Co., Ltd., Chimei InnoLux Corporation
    Inventors: Li-Jun Zhao, Tong Zhou
  • Patent number: 8213187
    Abstract: A power supply control circuit for use in a power supply is disclosed. An example power supply control circuit includes a power switch coupled between first and second terminals. The first terminal is to be coupled to a positive input supply rail of the power supply. The second terminal is to be coupled to an energy transfer element input of the power supply. A sampling circuit is coupled to a third terminal. The sampling circuit coupled to sample a signal across the energy transfer element input of the power supply during an off time of the power switch to provide a sampled output of the power supply. The sampled output of the power supply is disabled from being be resampled by the sampling circuit during an on time of the power switch. A control circuit coupled to the sampling circuit and the power switch, the control circuit coupled to switch the power switch in response to the sampled output of the power supply.
    Type: Grant
    Filed: October 14, 2009
    Date of Patent: July 3, 2012
    Assignee: Power Integrations, Inc.
    Inventor: David Michael Hugh Matthews
  • Publication number: 20120163047
    Abstract: A startup circuit includes a MOSFET that is connected between a startup power source and an auxiliary power source made of a smoothing capacitor and passes a startup current from the startup power source to the smoothing capacitor, a JFET that has a drain terminal connected to a drain terminal of the MOSFET and a source terminal connected through a resistor to a gate terminal of the MOSFET, and a pinch-off voltage controller that controls a pinch-off voltage of the JFET to a first reference voltage at startup and to a second reference voltage, which is lower than the first reference voltage, after startup.
    Type: Application
    Filed: December 19, 2011
    Publication date: June 28, 2012
    Applicant: Sanken Electric Co., Ltd.
    Inventors: Hideyuki KUBOTA, Satoshi Kondou
  • Patent number: 8207715
    Abstract: A soft-start circuit to generate and output a soft-start voltage having a specified gradient. The soft-start circuit includes a slope voltage generator circuit to generate and output multiple slope voltages having different specified gradients, including a steepest slope voltage whose gradient is steepest among the gradients of the multiple slope voltages and a mildest slope voltage whose gradient is mildest thereamong, at least one voltage conversion circuit to receive the slope voltages and output a voltage whose gradient is milder than the gradient of the steepest slope voltage, and a selection circuit to receive at least one specified reference voltage and the voltage generated by the voltage conversion circuit, compare the voltage by the voltage conversion circuit with the specified reference voltage, and output either the voltage or the specified reference voltage as the soft-start voltage in accordance with a comparison result generated by the selection circuit.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: June 26, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Takashi Gotoh
  • Publication number: 20120155127
    Abstract: Soft start circuits for a switching power converter include an amplifier configured to operate from a common bias node and amplify a difference between a positive input and a negative input to generate an amplifier output. A soft start bias circuit supplies a soft start bias current during a soft start process for the switching power converter. An operational bias circuit supplies an operational bias current after the soft start process. In some embodiments, a capacitor is operably coupled to the amplifier output and is configured to provide a frequency compensation for the switching power converter and a charging ramp for the soft start process. In some embodiments, the soft start circuit is configured such that the soft start bias current is at least an order of magnitude smaller than the operational bias current and limits a current that the amplifier can during the soft start process.
    Type: Application
    Filed: December 16, 2010
    Publication date: June 21, 2012
    Inventor: A. Paul Brokaw
  • Publication number: 20120146584
    Abstract: A method and a circuit for energizing an electrical device are described.
    Type: Application
    Filed: February 7, 2012
    Publication date: June 14, 2012
    Applicant: SONY ERICSSON MOBILE COMMUNICATIONS AB
    Inventor: Gunnar Klinghult
  • Patent number: 8194427
    Abstract: A switching power supply device includes: a transformer having a primary winding, a secondary winding and an auxiliary winding; a switching element connected to the primary winding of the transformer; a control circuit that performs an ON/OFF control for the switching element in a case where a voltage is inputted to the primary winding of the transformer, thereby induces voltages in the secondary winding and auxiliary winding of the transformer; a rectifying/smoothing circuit for rectifying and smoothing the voltage induced in the secondary winding of the transformer and outputting the voltage to a load; an auxiliary power supply circuit that rectifies and smoothes the voltage induced in the auxiliary winding of the transformer, and charges a capacitor owned by the auxiliary power supply circuit with the voltage to thereby supply power to the control circuit; and a starting circuit that supplies a current to the capacitor of the auxiliary power supply circuit in a case of starting the control circuit and in a
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: June 5, 2012
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Masaaki Shimada
  • Publication number: 20120120688
    Abstract: A startup circuit for use in a DC-DC converter having an input voltage terminal and an output voltage terminal, with the output voltage terminal connected to an output capacitor and with said converter including a pass transistor for transferring charge from the input terminal to the output terminal. The startup circuit includes a control circuit configured to cause the pass transistor to conduct an output current during start up when the output terminal voltage is approaching a final regulated voltage, with the output current being comprised of first and second current components, with the first current component being proportional to the output voltage and the second current component being proportional to the input voltage, with the two components being combined so as to resist changes in the power dissipation in the pass transistor during startup.
    Type: Application
    Filed: November 15, 2010
    Publication date: May 17, 2012
    Inventors: Siew K. Hoon, Mengzhe Ma
  • Patent number: 8169803
    Abstract: A power transistor chip and an application circuit thereof have a junction field effect transistor to act as a start-up circuit of an AC/DC voltage converter. The start-up circuit can be turned off after the PWM circuit of the AC/DC voltage converter operates normally to conserve the consumption of the power. Besides, the junction field effect transistor is built in the power transistor chip. Because the junction field effect transistor is fabricated with the same manufacturing process as the power transistor, it is capable of simplifying the entire process and lowering the production cost due to no additional mask and manufacturing process.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: May 1, 2012
    Assignee: Richtek Technology Corp.
    Inventors: Chih-Feng Huang, Kuo-Chin Chiu
  • Patent number: 8169802
    Abstract: Disclosed are a switch controller, a switch control method, a converter using the same, and a driving method thereof. A first voltage is generated by using a voltage that is input to an input terminal, and a soft start signal is generated by using the first voltage during a soft start duration. A switching operation is controlled by using the soft start signal during the soft start duration.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: May 1, 2012
    Assignee: Fairchild Korea Semiconductor, Ltd.
    Inventors: Jin-Tae Kim, Gwan-Bon Koo, Hang Seok Choi
  • Patent number: 8169207
    Abstract: A power supply device has an error amplifier producing an error voltage by amplifying a difference between a feedback voltage according to an output voltage and a predetermined reference voltage, an output portion producing a desired output voltage from an input voltage in such a way that the error voltage is reduced, and a clamping portion setting, during a predetermined period after startup of the power supply device, an upper limit of the error voltage to a value that is lower than a value obtained at normal times, such that the lower the input voltage the higher the upper limit, the higher the input voltage the lower the upper limit.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: May 1, 2012
    Assignee: Rohm Co., Ltd.
    Inventor: Masaki Omi
  • Publication number: 20120099350
    Abstract: An integrated circuit includes a threshold detection circuit that is coupled to measure a signal from a first resistive external circuit coupled between a fourth external terminal of the integrated circuit and a first external terminal of the integrated circuit during a duration of an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period of the integrated circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the signal measured from the first resistive external circuit during the duration of the initialization period after the fourth external terminal has been charged to the supply threshold value.
    Type: Application
    Filed: January 4, 2012
    Publication date: April 26, 2012
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8159842
    Abstract: The present invention discloses a power converter with extremely low standby power consumption for converting an input AC power to an output DC power, comprising: a DC supply voltage generating unit, used for generating a DC supply voltage; a pulse width modulation controller, used for generating a pulse width modulation signal according to a feedback voltage of the output DC power; and an isolated actuating switch, placed between the DC supply voltage generating unit and the pulse width modulation controller, for controlling the supply of the DC supply voltage to the pulse width modulation controller, according to a switch signal from a loading device.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: April 17, 2012
    Assignee: Chicony Power Technology Co., Ltd.
    Inventors: Fu-Sung Chen, Sen-Chi Lin, Ming-Ho Huang
  • Patent number: 8149602
    Abstract: A PSE configured to determine the end of the start up phase at the PD responsive to a condition of the voltage at the PSE output. In one particular embodiment, the startup phase end is determined responsive to a PSE output voltage within a predetermined range of the PSE input voltage. In another particular embodiment, the startup phase end is determined responsive to the voltage drop associated with the PSE current limiter being lower than a predetermined maximum. In yet another particular embodiment, the startup phase end is determined responsive to the absolute value of the rate of change of the PSE output voltage being lower than a predetermined value. In yet another particular embodiment, the startup phase end is determined responsive to the absolute value of the rate of change of the voltage drop associated with the PSE current limiter being lower than a predetermined value.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: April 3, 2012
    Assignee: Microsemi Corp.-Analog Mixed Signal Group, Ltd.
    Inventor: Yair Darshan
  • Patent number: 8143954
    Abstract: A device can be coupled to an electrical load for supplying electrical power to the electrical load. The device contains an oscillator unit and an auxiliary oscillator unit. The oscillator unit is configured to generate an output signal of the device which can be supplied to the electrical load and which has a first frequency. The auxiliary oscillator unit is electrically coupled to the oscillator unit. The auxiliary oscillator unit is configured to excite the oscillator unit to oscillate at a second frequency greater than the first frequency. The auxiliary oscillator unit contains a timing element which is configured and arranged to terminate the excitation of the oscillator unit after the expiration of a pre-specified period of time after the start of the oscillator unit and the auxiliary oscillator unit.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: March 27, 2012
    Assignee: Continental Automotive GmbH
    Inventor: Stephan Bolz
  • Publication number: 20120057379
    Abstract: A power supply circuit for an electrical appliance, including a turning-on stage configured for determining a transition from a turned-off state, in which the power supply circuit is off and does not supply electric power, to a turned-on state of the power supply circuit. The turning-on stage includes a transducer of the remote-control type configured for triggering the transition in response to the reception of a wireless signal.
    Type: Application
    Filed: March 17, 2010
    Publication date: March 8, 2012
    Applicant: STMicroelectronics S.r.l.
    Inventor: Natale Aiello
  • Patent number: 8129963
    Abstract: The invention relates to a DC to DC converter comprising a DC to DC converter unit (DCW), a first field effect transistor (FET1) for the voltage conversion, a bipolar transistor (BP1) as a starting aid, and a second field effect transistor (FET2) for switching-off the bipolar transistor (BP1). Said bipolar transistor (BP1) is mounted in parallel with the first field effect transistor (FET1), and the second field effect transistor (FET2) is mounted upstream of the bipolar transistor (BP1).
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 6, 2012
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventors: Frank Hagemeyer, Peter Himmelreich
  • Patent number: 8129965
    Abstract: A low dropout regulator includes an error amplifier, an N-type depletion MOSFET, a first switch, a second switch, a low-pass filter resistor, and a low-pass filter capacitor. By switching on both the first switch and the second switch, a voltage level of an output node at a negative input terminal of the error amplifier may be rapidly raised to be close to and lower than a voltage level of an input node at a gate of the N-type depletion MOSFET. Both the first switch and the second switch are then switched off immediately so that the voltage level of the output node is gradually raised to be equal to the voltage level of the input node through the low-pass filter resistor.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: March 6, 2012
    Assignee: Advanced Analog Technology, Inc.
    Inventors: Shun-Hau Kao, Mao-Chuan Chien, Chih-Liang Huang
  • Publication number: 20120051101
    Abstract: A power inverter system includes a plurality of power semiconductor switching devices. Each switching device includes a corresponding gate turn off resistance configured to increase during starting up periods of the inverter system such that the open circuit voltage of a corresponding power source providing power to the power inverter system does not exceed the switching device blocking voltage ratings during the corresponding switching turn-off periods. The starting up period is the time required to bring the corresponding power source voltage from its open circuit voltage level to a predetermined voltage which constitutes a safe operating condition for the plurality of power semiconductor switching devices.
    Type: Application
    Filed: August 28, 2010
    Publication date: March 1, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Said Farouk Said El-Barbari, Anthony William Galbraith
  • Publication number: 20120051102
    Abstract: A power converter system includes a converter configured to be coupled to a power generation unit for receiving power from the power generation unit, and a bus coupled to the converter, wherein a voltage is generated across the bus when electricity is conducted through the power converter system. The power converter system also includes an inverter coupled to the bus and configured to supply power to an electrical distribution network, and a control system coupled to the converter and to the inverter. The control system is configured to gradually adjust the voltage across the bus during at least one of a shutdown sequence and a startup sequence of the power converter system.
    Type: Application
    Filed: August 25, 2011
    Publication date: March 1, 2012
    Inventors: Robert Gregory Wagoner, David Smith
  • Patent number: 8120343
    Abstract: According to the present invention, it is possible to prevent an overcurrent from passing through a switching element 1 during overcurrent protection and reduce power consumption during standby while detecting an output voltage immediately after power-on and achieving soft start control without being restricted by time.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: February 21, 2012
    Assignee: Panasonic Corporation
    Inventor: Takashi Kunimatsu
  • Publication number: 20120039096
    Abstract: In one embodiment, a startup circuit for a power supply is provided. The startup circuit comprises a resistance coupled between a voltage source and a first node. A first capacitor, coupled to the first node, is operable to be charged by current flowing through the resistance. A first transistor has an emitter, a base, and collector, wherein the collector is coupled to the voltage source and the base is coupled to the first node. A diac circuit. coupled to the emitter of the first transistor, is operable to fire to turn on the first transistor, thereby allowing discharge of the first capacitor through the base-emitter junction of the first transistor. A second capacitor is operable to be charged by current related to a discharge voltage resulting from the firing of the diac circuit. The second capacitor operable to store charge to provide VCC voltage to a controller of the power supply.
    Type: Application
    Filed: August 11, 2011
    Publication date: February 16, 2012
    Inventor: Richard A. Dunipace
  • Patent number: 8116106
    Abstract: Techniques are disclosed to select functional parameters and/or operating modes of a circuit based on a measurement during an initialization period. In one aspect an integrated circuit includes a threshold detection circuit coupled to measure during an initialization period of the integrated circuit a signal from a first external circuit comprising one or more components coupled to a first external terminal of the integrated circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the signal from the first external circuit during the initialization period of the integrated circuit. The first external terminal is further coupled to one or more additional external circuits, each of which comprising one or more components.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: February 14, 2012
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong