Electric power conversion systems inventions 04/08

20080094861 - Predictive duty ratio generating circuit and method for synchronous boost converters operating in pfm mode: A synchronous DC-to-DC converter includes an inductor coupled to receive an input voltage, a first transistor having a source coupled to a first reference voltage and a drain coupled to the inductor, and a second transistor having a source coupled to an output conductor to produce an output voltage and... Agent: Texas Instruments Incorporated

20080094862 - High power-factor ac/dc converter with parallel power processing: The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property when operating in DCM even though the boost output is close to the peak value of the line voltage. Moreover, it allows part... Agent: Troxell Law Office, PLLC

20080094863 - Inverter-filter non-linearity blanking time and zero current clamping compensation system and method: Inverter-filter non-linearity blanking time and zero current clamping compensation is accomplished by comparing the average output current with the discontinuous current mode threshold values to determine when the average output current is entering a discontinuous current mode and introducing a compensation voltage to the inverter drive voltage in response to... Agent: Iandiorio & Teska

20080094865 - Supply power control with soft start: Charge storage devices (e.g., batteries or supercapacitors) need to be charged from time to time. In an apparatus, to protect a charge storage device as well as the supply used to charge it, the apparatus typically includes power loop control circuitry. One approach to implementing the power loop control employs... Agent: Thelen Reid Brown Raysman & Steiner LLP

20080094867 - Switching device and method, in particular for photovoltaic generators: The subject matter of the invention is an inverter (3), more specifically for use in a photovoltaic plant (1) with a direct voltage input (connection terminals 4; 5) for connection to a generator (2) and an alternating voltage output (connection terminals 7; 8) for feeding into an energy supply network... Agent: Pyle & Piontek Attn: Thomas R. Vigil

20080094868 - Power system for a telecommunications network: A reliable, end-to-end power supply solution for components of a telecommunications network provides either a primary source or a backup source of electrical power at various telecommunications sites for reliable operation of telecommunications equipment. One subsystem of the power supply solution includes one or more proton exchange membrane type fuel... Agent: Sprint Communications Company L.p.

20080094860 - Bidirectional battery power inverter: Disclosed is a bi-directional battery power inverter (1) comprising a DC-DC converter circuit element (3) to which the battery (2) can be connected in order to generate an AC output voltage from a battery (2) voltage in a discharging mode while charging the battery (2) in a charging mode. The... Agent: Pyle & Piontek Attn: Thomas R. Vigil

20080094858 - Power converter: A power converter includes a transformer having a primary winding and a secondary winding, and a plurality of switches coupled to the primary and secondary winding, the plurality of switches responsive to at least one control signal to short both the primary and secondary winding during a first reset time... Agent: Grossman, Tucker, Perreault & Pfleger, PLLC

20080094859 - Switching power supply unit: A switching power supply unit is provided, which can output a DC voltage and an AC voltage with a minimized installation space. A switching circuit is provided between a winding of a transformer and a main battery. A rectifier circuit is provided between other windings of the transformer and an... Agent: Oliff & Berridge, PLC

20080094864 - Polyphase current supplying circuit and driving apparatus: This invention is to reduce a voltage across a smoothing capacitor in a single-phase capacitorless inverter. A smoothing circuit (15) has a smoothing capacitor (C) connected between a pair of power supply lines (L1, L2). A diode (Ds) has its anode connected to one of the power supply lines (L1)... Agent: Birch Stewart Kolasch & Birch

20080094866 - Capacitor-switched lossless snubber: A regenerative snubber circuit for a boost converter is provided which greatly reduces the switching losses of the IGBT in the converter. The circuit uses no additional magnetic components, has a simple control strategy, is relatively low-cost, and provides an increase in efficiency and decrease in size and mass of... Agent: Miller Thompson, LLP

20080089099 - Half-bridge ccfl driving apparatus: A half-bridge CCFL driving apparatus uses a bridge rectifier to convert AC into a DC voltage and stores the DC voltage in a capacitor unit. The capacitor unit averages the DC voltage into two voltages that are equal for outputting. Then, the primary winding of the transformer is connected with... Agent: Rosenberg, Klein & Lee

20080089100 - Switching mode power supply and driving method: A switching mode power supply includes a switching transistor, coupled to a primary coil at a primary side of a transformer for converting an input DC voltage, supplying power to a secondary and a tertiary coil at a secondary side of the transformer according to an operation of the switching... Agent: Sidley Austin LLP

20080089102 - Power converter control and power conversion method: A power converter and power conversion method wherein operation of a switching element is controlled by the frequency of a carrier wave where the frequency is varied such that the same frequency of the carrier wave is not repeated during a single modulation period.... Agent: Young & Basile, P.C.

20080089098 - Controller for power converter: A controller for providing out of phase drive signals to a power converter having at least a first power unit and second power unit. The controller may comprise input circuitry adapted to receive a first signal from a first path and a second signal from a second path and provide... Agent: Grossman, Tucker, Perreault & Pfleger, PLLC

20080089101 - Multi-phase converter with improved current sharing: A multi-phase converter has a plurality of switching circuits each controlled by a phase controller and each providing a switched output voltage to an output node of the converter. Each switching circuit sequentially provides a switched output voltage to the output node at which an output voltage of the converter... Agent: Ostrolenk Faber Gerb & Soffen

20080089103 - High efficiency dc to ac power converter: A high efficiency DC to AC power converter capable of achieving zero voltage switching by provision of an inductive impedance in a conversion circuit. The inductive impedance takes a form of an inductance connected in series with a capacitor. In addition, the inductive impedance may be provided in a half-wave... Agent: Hdsl

20080084712 - Method and apparatus for a control circuit responsive to an impedance coupled to a control circuit terminal: A power supply controller method and apparatus measuring impedance is disclosed. An apparatus according to aspects of the present invention includes a sense circuit coupled to a sense terminal. A regulation circuit coupled to the sense circuit and coupled to regulate the sense terminal to a first voltage level when... Agent: Blakely Sokoloff Taylor & Zafman

20080084713 - Method and apparatus for a control circuit with multiple operating modes: An apparatus and method of regulating a power converter with multiple operating modes are disclosed. A circuit according to aspects of the present invention 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,... Agent: Blakely Sokoloff Taylor & Zafman

20080084715 - Post regulation control circuit of power supply: In a post regulation control circuit mainly used in a switching power supply with several sets of outputs, the circuit adopts leading edge synchronization and conduction time regulation for the control, and a leading edge of the waveform of an input voltage of a detected secondary inductor generates a sync... Agent: Da-jing Hsu

20080084716 - Intelligent method for dc bus voltage ripple compensation for power conversion units: A power conversion system having a DC power distribution bus includes multiple power converters connected to the DC power distribution bus with modulation frequencies synchronized so that providing phase shifts between the different modulations has the effect of compensating voltage and current ripples, e.g., reducing voltage fluctuations, across the DC... Agent: Honeywell International Inc.

20080084717 - Multi-phase buck converter with a plurality of coupled inductors: A multi-phase converter comprising 2N+1 inductors; and 2N+1 switching converters parallel connected and each including a switched node; wherein N is an even integer, a pair of said inductors are coupled and wound about a common core and each said coupled inductor is connected at one pole thereof to a... Agent: Ostrolenk Faber Gerb & Soffen

20080084718 - Self oscillating inrush current limiting converter: There is disclosed a power converter having limited inrush current and an inrush current limiter circuit. The inrush limiting circuit may be a self-oscillating switching-mode average current regulator tp provide a relatively constant average charging current to a bulk capacitor until the bulk capacitor is fully charged. A bypass switch... Agent: Socal Ip Law Group LLP

20080084719 - Quenching device for a converter bridge with line regeneration: There is described a method for controlling a quenching device for a converter bridge with line regeneration, whereby the converter bridge controlled by a network-timed control circuit by ignition pulses is connected with its three inputs to the phases of a three-phase network and the two outputs of the bridge... Agent: Siemens Corporation Intellectual Property Department

20080084721 - Linear, inductance based control of regulated electrical properties in a switch mode power supply of a thermal processing system: A method and apparatus is featured for providing linear control of a regulated electrical property (e.g., current or voltage) in a switch mode power supply of a thermal processing system that includes an inductive element and at least one switching element. The method and apparatus feature structure, or steps, for... Agent: Proskauer Rose LLP

20080084722 - Inverter circuit and backlight unit having the same: An inverter circuit according to an embodiment comprises an input unit to which a first voltage is applied, a transformer for transforming the first voltage output from the input unit, a first switching unit for switching an on/off state of the transformer, an inverter controller for controlling an operation of... Agent: Saliwanchik Lloyd & Saliwanchik A Professional Association

20080084723 - Method and apparatus to reduce audio frequencies in a switching power supply: An apparatus and method of switching a switch of a power supply are disclosed. According to aspects of the present invention, a method includes controlling a switch of a switching power supply to switch on and off within a switching cycle. The switching cycle has a substantially fixed period. One... Agent: Blakely Sokoloff Taylor & Zafman

20080084714 - Dual-transformer type of dc-to-dc converter: A first AC/DC converter circuit is coupled via two transformers to a second AC/DC converter circuit, the first AC/DC converter circuit having a symmetrical configuration of two switching elements performing complementary opened/closed switching, to alternately connect positive and negative terminals of a DC source to a junction between transformer primary... Agent: Nixon & Vanderhye, Pc

20080084720 - Dc-dc boost converter with a charge pump: A DC-DC boost converter comprises a charge pump selectively operating in a voltage doubler or in a voltage tripler mode. A switching arrangement connects the charge pump to an input voltage terminal in a charge phase and to an output voltage terminal in a discharge phase. A controllable current source... Agent: Texas Instruments Incorporated

20080080212 - Switched-mode power supply system and speed variator comprising such a system: The invention relates to a switched-mode power supply system comprising two buffer capacitors connected in series and connected between the two input terminals of a DC input voltage source, two switches connected in series, a primary inductive assembly connected in series with the two switches, and a secondary winding magnetically... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080080213 - Method for smoothing input current to a power delivery system having regeneration capability: A method for smoothing input current to a power delivery system having regeneration capability. The method comprises evaluating input current to an input converter of the power delivery system for a first fundamental cycle, and shifting a window relative to a waveform of an input voltage after the first fundamental... Agent: Siemens Corporation Intellectual Property Department

20080080214 - Rectifier circuit and radio communication device using the same: A rectifier circuit includes an input terminal that receives an alternating-current signal, a first rectifier circuit that generates a first direct-current voltage from the alternating-current signal, a bias-voltage generating circuit that generates a bias voltage from the first direct-current voltage, and a second rectifier circuit that generates a second direct-current... Agent: Amin, Turocy & Calvin, LLP

20080080215 - Systems and methods for driving a ferrite load: A ferrite load driver system in accordance with the invention includes a clock generator configured to generate a digital clock signal. The system further includes a digital pulse generator configured to generate an enable pulse having a pulse width equal to a certain number of clock cycles of the digital... Agent: King & Spalding LLP

20080080216 - Device for driving light sources: A driving device for driving a lamp (L) includes a power stage circuit (21), a transformer circuit (22), a voltage dividing circuit (23), an inrush current sensing circuit (24), and a controller circuit (26). The power stage circuit converts a received direct current (DC) signal to an alternating current (AC)... Agent: PCe Industry, Inc. Att. Cheng-ju Chiang Jeffrey T. Knapp

20080080217 - Circuit device: A circuit device includes: a first booster circuit, started by a predetermined input voltage, which converts the input voltage into a first boosted voltage higher than the input voltage; a capacitor, connected to the booster circuit, which charges the first boosted voltage; a second booster circuit, connected to the capacitor... Agent: Fish & Richardson P.C.

20080080218 - Bandwidth and output impedance control in a power supply: A power supply includes a feedback loop allowing user control of bandwidth and output impedance. The feedback may combine both voltage feedback and current feedback. Control of power supply bandwidth and impedance allows legacy power supply emulation in automated test systems.... Agent: Knobbe Martens Olson & Bear LLP

20080080219 - Synchronous rectification switching regulator, control circuit for synchronous rectification switching regulator, and control method for same: A control circuit for a synchronous rectification switching regulator including an output terminal, a switching transistor, an inductor, and a synchronous rectification transistor has a control part configured to control switching of the switching transistor to charge the inductor to and set a voltage output from the output terminal to... Agent: Dickstein Shapiro LLP

20080080220 - Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor: An inverter (100) comprises first and second input terminals (102,104), an inverter output terminal (106), a series arrangement of a first inverter transistor (110) and a second inverter transistor (120), a driver circuit (130), a primary current sensing circuit (150,154,156), and an auxiliary current sensing circuit (160). Primary current sensing... Agent: Fitch Even Tabin And Flannery

20080080221 - Inverter: To overcome such a difficulty, the structure of the inverter in which a bottom gate organic semiconductor transistor showing enhancement type characteristics is used as a driver transistor, and a top gate organic semiconductor transistor showing depletion type characteristics is used as a load transistor, and a manufacturing method thereof... Agent: Ladas & Parry LLP