Patents Examined by Shawn Riley
  • Patent number: 8462523
    Abstract: An example controller for a switched mode power supply includes a zero-crossing detector and a drive signal generator. The zero-crossing detector is coupled to generate a zero-crossing signal representative of a phase angle of a dimmer output voltage for a half line cycle of the power supply. The drive signal generator controls switching of a switch to regulate an output of the power supply in response to a feedback signal representative of the output. The drive signal generator further controls switching of the switch to adjust dimming of the output of the power supply in response to the phase angle indicated by the zero-crossing signal.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: June 11, 2013
    Assignee: Power Integrations, Inc.
    Inventors: Yury Gaknoki, Mingming Mao, Tiziano Pastore
  • Patent number: 8461809
    Abstract: The present invention relates to a power conditioning unit for delivering power from a dc power source to an ac output, particularly ac voltages greater than 50 volts, either for connecting directly to a grid utility supply, or for powering mains devices independent from the mains utility supply. We describe a power conditioning unit for delivering power from a dc power source to an ac mains output, the power conditioning unit comprising an input for receiving power from said dc power source, an output for delivering ac power, an energy storage capacitor, a dc-to-dc converter having an input connection coupled to said input and an output connection coupled to the energy storage capacitor, and a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output, wherein said energy storage capacitor has a capacitance of less than twenty microfarads.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: June 11, 2013
    Assignee: Enecsys Limited
    Inventor: Cuauhtemoc Rodriguez
  • Patent number: 8461810
    Abstract: A boosted voltage generation circuit may include: a boosting circuit configured to boost an input voltage based on a boosting rate and output a boosted voltage, a boosting rate setting unit configured to receive a feedback on a level of the input voltage and set a boosting rate, and an input voltage level setting unit configured to set the level of the input voltage in response to a target level of the boosted voltage and the boosting rate.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: June 11, 2013
    Assignee: MagnaChip Semiconductor, Ltd.
    Inventor: Kyu-young Chung
  • Patent number: 8456143
    Abstract: A control technology which eliminates the need for changing the switching frequency even under light load where the on-time of a drive switching element becomes shorter than a minimum on-time dependent on the characteristics of the circuit in a synchronous rectification switching regulator. The synchronous rectification switching regulator includes a drive switching element for storing energy in a coil by applying a DC input voltage from a DC power supply to an inductor and permitting a current to flow, and a rectification switching element for rectifying the current of the inductor during an energy discharge period where the drive switching element is turned off. The timing for turning off the rectification switching element under light load is delayed so as to store energy in the inductor from the output, and the on-time is controlled to become longer as the load becomes lighter by the output from an error amplifier.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: June 4, 2013
    Assignee: Mitsumi Electric Co., Ltd.
    Inventor: Heisuke Nakashima
  • Patent number: 8456871
    Abstract: One example controller for a power supply includes an oscillator, a drive signal generator, and a restart circuit. The oscillator generates a clock signal and the drive signal generator controls switching of a switch to regulate an output of the power supply in response to the clock signal. The restart circuit generates a restart signal in response to a current through the switch and in response to an absolute maximum on time period. The oscillator generates the clock signal to have a fixed maximum frequency in response to the restart signal indicating that the current through the switch reaches a current limit threshold within the absolute maximum on time period. The oscillator also generates the clock signal to have a variable minimum frequency in response to the restart signal indicating that the current through the switch has not reached the current limit threshold within the maximum on time period.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: June 4, 2013
    Assignee: Power Integrations, Inc.
    Inventors: Chan Woong Park, Alex B. Djenguerian, Kent Wong
  • Patent number: 8456096
    Abstract: Circuits for regulating and/or controlling integrated circuits such as drivers and switching regulators generally include a first switch configured to control or regulate a current, voltage drop or voltage boost; a first regulator or driver configured to transmit first pulses to the first switch, the pulses having a first pulse width; and pulse width modulation circuitry configured to (i) reduce the first pulse width when a first thermal threshold is met and (ii) increase the first pulse width when a second thermal threshold is met, the second thermal threshold being less than the first thermal threshold.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: June 4, 2013
    Assignee: Dongbu HiTek Co., Ltd.
    Inventors: Kenneth Kwok, Jan Krellner, Steven Ulbrich, Joon Park
  • Patent number: 8456248
    Abstract: A circuit arrangement (S) for supplying a load (P), whose essential electric property is capacitance, from a DC voltage source (U0) has a switch element (S1), which in the operational state is alternately switched between the conductive and non-conductive state, and at least one component (L1, L2) whose essential property is inductance, the load (P) being coupled into the circuit arrangement (S) in parallel to the component (L1, L2) so that the load (P) and the component (L1, L2) form a parallel resonant circuit, the switch element (S1) is connected between the parallel resonant circuit and a base voltage (GND) and the DC voltage source is to be applied in parallel (U0) to the load. The circuit arrangement (S) according to the invention can be used to drive the capacitive load (P) in a bipolar manner, the supply of the load in the non-conductive phase of the switch element (S1) being achieved by the component (L1, L2).
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: June 4, 2013
    Assignee: Braun GmbH
    Inventors: Uwe Schober, Robert Schäfer, Frank Kressmann
  • Patent number: 8451630
    Abstract: A reset voltage circuit for a forward power converter includes a reset capacitor and a memory capacitor. The reset capacitor is to be coupled to recycle energy from a primary winding of a transformer to an input bulk capacitor during a resetting of the transformer. The memory capacitor is to be coupled to store a first voltage equal to an input voltage of the power converter when the input voltage is at a steady-state value. The memory capacitor is further to set a voltage across the primary winding during the resetting of the transformer to a magnitude greater than or equal to the first voltage when the input voltage of the forward power converter drops below the steady-state value.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: May 28, 2013
    Assignee: Power Integrations, Inc.
    Inventors: Ionut A. Nania, Arthur B. Odell
  • Patent number: 8446051
    Abstract: The present invention concerns an electrical installation or device equipped with a power supply unit comprising a voltage converter having primary and secondary parts respectively defining a primary side and a secondary side of this electrical installation or device. This power supply unit comprises a power management unit arranged on the primary side, the primary part of the converter being associated with a control circuit also arranged on the primary side and controlling the electrical energy flowing in the primary power path of the primary part. The control circuit receives from the power management unit at least a first control signal for switching OFF the electrical energy in the primary power path, the power supply unit entering a very low power mode (“Power-down” mode) when the first control signal is set to OFF so that the converter is not supplied anymore.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: May 21, 2013
    Assignee: EM Microelectronic-Marin S.A.
    Inventors: Daniel Luthi, Jean-Noel Divoux, Steffen Schmid, Siegfried Kern
  • Patent number: 8437149
    Abstract: A power supply produces one or more conditioned and scaled output voltages with low noise. The power supply has various components to produce a plurality of higher output voltages from a plurality of taps of a multiplier or multiple isolated outputs. Components include an internal reference voltage circuit or an external voltage that generates a reference voltage and a sine wave power oscillator circuit and resonant circuit that generates an alternating current and voltage. The power supply has a controlled current source circuit connected to the sine wave power oscillator circuit for regulating the power level to the sine wave power oscillator. A control amplifier circuit controls the current level to the controlled current source circuit based on the error between the sampled output and the reference voltage. The resonant transform connected to the sine wave power oscillator circuit generates one or more scaled output voltages on one or more secondary windings.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: May 7, 2013
    Assignee: University of New Hampshire
    Inventor: Christopher M. Bancroft
  • Patent number: 8427130
    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: Grant
    Filed: December 16, 2010
    Date of Patent: April 23, 2013
    Assignee: Integrated Device Technology, Inc.
    Inventor: A. Paul Brokaw
  • Patent number: 8422261
    Abstract: A semiconductor device capable of reducing an inductance is provided. In the semiconductor device in which a rectification MOSFET, a commutation MOSFET, and a driving IC that drives these MOSFETs are mounted on one package, the rectification MOSFET, a metal plate, and the commutation MOSFET are laminated. A current of a main circuit flows from a back surface of the package to a front surface thereof. The metal plate is connected to an output terminal via a wiring in the package. Wire bondings are used for wirings for connecting the driving IC, the rectification MOSFET, and the commutation MOSFET, all terminals being placed on the same plane. For this reason, the inductance becomes small and also a power source loss and a spike voltage are reduced.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: April 16, 2013
    Assignee: Renesas Electronics Corporation
    Inventors: Takayuki Hashimoto, Nobuyoshi Matsuura, Masaki Shiraishi, Yukihiro Satou, Tetsuya Kawashima
  • Patent number: 8421432
    Abstract: Three modifications are provided to obtain a fast and accurate average current limit in a DC/DC converter. The first modification relates to providing a bias signal control configured to apply a variable DC bias signal to the compensation ramp signal generated in the DC/DC converter so that the compensating ramp signal is biased to zero at the end of each ON-time for each cycle so that the peak current limit is independent of the duty cycle of the pulse width modulation signal during current limit conditions. A second modification relates to modulating the clamp voltage that establishes the peak current limit as a function of ripple of the inductor current for each cycle of the pulse width modulation signal so as to reduce or cancel the effect of the inductor ripple current on the average output current during current limit conditions.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: April 16, 2013
    Assignee: Linear Technology Corporation
    Inventor: Charles Edward Hawkes
  • Patent number: 8416583
    Abstract: An energy output circuit and its control method includes a switch device (2), a transformer (4) and a controller (1). The switch device (2) is connected between a primary of the transformer (4) and an input power source in series. The controller (1) calculates an energy output waveform and sends a command according to a request or a level to control the switch device (2), to control the on/off time of the primary of the transformer (4). The transformer (4) is an ordinary low-frequency transformer.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: April 9, 2013
    Inventor: John Lam
  • Patent number: 8415936
    Abstract: A multiphase DC-DC converter including at least one conversion path, multiple switch capacitance networks, and a multiphase switch controller. Each conversion path includes first and second intermediate nodes. Each switch capacitance network includes a capacitance coupled in parallel with an electronic switch and is coupled to one of the intermediate nodes. The switch controller controls the switch capacitance networks using zero voltage switching. Multiple phases may be implemented as multiple conversion paths each having first and second intermediate nodes coupled to first and second switch capacitance networks, respectively. A single conversion path may be provided with multiple switch capacitance networks coupled to each intermediate node for multiple phases. Alternatively, a common front end with a first intermediate node is coupled to one or more switch capacitance networks followed by multiple back-end networks coupled in parallel for multiple phases.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: April 9, 2013
    Assignee: Intersil Americas Inc.
    Inventor: Zaki Moussaoui
  • Patent number: 8416582
    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: Grant
    Filed: May 17, 2010
    Date of Patent: April 9, 2013
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Hiroshi Usui
  • Patent number: 8415837
    Abstract: Embodiments of the present invention provide cross-coupled rectifiers that use near zero-threshold transistors in a switching topology, but provide a topology that avoids reverse conduction problems. Importantly, preferred embodiment rectifiers of the invention only provide a slightly increased on-resistance in each branch, while providing both very high operating efficiency and very low turn-on voltage. An embodiment of the invention is a voltage rectifier for the conversion of RF energy into DC voltage with a turn-on threshold voltages approaching 0V.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: April 9, 2013
    Assignee: The Regents of the University of California
    Inventors: Paul Theilmann, Peter Asbeck
  • Patent number: 8410769
    Abstract: A power converter and method of controlling the same for selected modes of operation. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to control an operation of the first and second power switches during selected modes of operation.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: April 2, 2013
    Assignee: Enpirion, Inc.
    Inventors: Douglas Dean Lopata, Ashraf W. Lotfi
  • Patent number: 8411472
    Abstract: In a power conversion device, reactors in an AC input filter absorbing a voltage at a carrier frequency of a PWM converter and reactors in an AC output filter absorbing a voltage at a carrier frequency of a PWM inverter include one six-leg six-phase iron core reactor. Accordingly, the device can be reduced in size when compared with a case where the reactors are composed of two four-leg six-phase iron core reactors.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: April 2, 2013
    Assignees: Toshiba Mitsubishi-Electric Industrial Systems Corporation, Kobe Electric Industry Inc.
    Inventors: Eduardo Kazuhide Sato, Masahiro Kinoshita, Yushin Yamamoto, Tatsuaki Amboh, Yasuhiro Yabunishi
  • Patent number: 8410639
    Abstract: Electronic leakage reduction techniques are provided, whereby a device is configured to detect characteristics of an appliance and its power supply when the appliance is off or otherwise placed in a mode for reduced power use by said appliance, and whereby voltage and power provided to the appliance are then substantially reduced. In other aspects of the invention, user behavior may also manually control power delivered to the appliance, for example, with a switch. In still other aspects of the invention, a device is configured to detect characteristics of an appliance and its power supply when the appliance is on or otherwise placed in a mode for higher power use by said appliance, and increases power to the appliance.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: April 2, 2013
    Assignee: Loughton Technology, L.L.C.
    Inventor: Christopher V. Beckman