Electric power conversion systems inventions

20090279326 - Switching power source apparatus: Disclosed a switching power source apparatus including: a transformer including a primary winding and a secondary winding; a switching element to intermittently apply a voltage to the primary winding by an on-off operation; and a synchronous rectifying element to rectify a current in the secondary winding, wherein the switching power... Agent: Frishauf, Holtz, Goodman & Chick, PC

20090279327 - Insulated dc-dc converter: In an isolated DC-DC converter, an on-period control circuit generates an off-timing signal when the output voltage of an isolated DC-DC converter exceeds a reference voltage. A signal reception/power switch driving circuit causes a first switching device to be turned on based on a pulse signal for switching that is... Agent: Murata Manufacturing Company, Ltd. C/o Keating & Bennett, LLP

20090279328 - Hvdc system and method to control a voltage source converter in a hvdc system: A method to control a voltage source converter in a HVDC system includes controlling a frequency and a voltage amplitude of an AC voltage generated by the voltage source converter independently of the conditions in an AC network connected to the voltage source converter. The method is performed by a... Agent: Venable LLP

20090279329 - Digital latch control circuit for over-voltage protection and power converter using the control circuit: An AC/DC power supply with over-voltage protection includes a voltage converting circuit and a digital latch control circuit. The voltage converting circuit has a first-side winding, a second-side winding, and an auxiliary winding for providing a supply voltage according to the AC input voltage. The digital latch control circuit is... Agent: North America Intellectual Property Corporation

20090279330 - Device and method for limiting drain-source voltage of transformer-coupled push pull power conversion circuit:

20090279331 - Acdc converter: This invention relates to an ACDC converter (1) comprising a converter input (3) and a converter output (5), a pre-regulation stage (7) and a DC transformer stage (9) comprising a transformer input stage (11) and a transformer output stage (13). The transformer input stage comprises a double ended converter and... Agent: Holland & Knight LLP

20090279332 - Flyback constant voltage converter having both a pwfm mode and a pwm mode: A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is regulated using both pulse width modulation and pulse frequency modulation. Both types of modulation are used simultaneously. In a... Agent: Imperium Patent Works

20090279333 - Method and apparatus for reducing standby power of switching mode power supplies: An apparatus for coupling a switching mode power supply (SMPS) controller to a rectified line voltage. The apparatus includes a high-voltage startup transistor configured to provide a charging current during a startup phase of the SMPS controller and to provide substantially no current during a normal operation phase of the... Agent: Townsend And Townsend And Crew, LLP

20090279334 - Electronic device and switching power supply thereof: A switching power supply includes a rectifier circuit, a converter, a detecting unit, a control unit, a switching unit, and a protection unit. The rectifier circuit is used for rectifying an input voltage into a first direct current voltage. The converter is configured for generating a first current according to... Agent: PCe Industry, Inc. Att. Steven Reiss

20090279336 - Inverter modulator with variable switching frequency: An inverter control is used to control the output of a distributed power generating station, such as a photovoltaic (PV) solar power station, connected to a power grid. The power station is connected to an inverter output. Pulse width modulation is used to shape the output in order to maximize... Agent: The Nath Law Group

20090279335 - Power converter: To provide a power converter, comprising: a pair of main circuit switching elements to which diodes are connected; a means for generating a first PWM basic signal for driving a main circuit switching element; and a reverse voltage application circuit to be operated, triggered by a second PWM basic signal... Agent: Dla Piper LLP Us

20090279337 - Load drive device and vehicle equipped with the same: A surge voltage generated by the switching operation of an IGBT element and voltage variation generated in an equivalent series resistance of a capacitor are superimposed on an input voltage of an inverter. The equivalent series resistance has a temperature dependence that a resistance value increases with a decrease in... Agent: Kenyon & Kenyon LLP

20090279338 - Cycloconverter generator: In a cycloconverter generator, there are provided, q number of power circuits that supply rectified DC power of a DC power supply unit as operating power to the p (p>q) number of thyristors, and r (p>r) number of thyristor drive circuits that are connected to the q number of the... Agent: Arent Fox LLP

20090279339 - Cycloconverter generator: In a cycloconverter generator equipped with an AC power generator that generates single-phase AC power to be supplied to a load by turning on positive and negative switching elements at variable timing every half-period of a desired AC power frequency based on a phase signal and a DC power generator... Agent: Arent Fox LLP

20090273950 - Power-saving device for power supply: A power-saving device for power supply, including a transformer having a primary coil and a secondary coil. The primary coil is electrically connected with a power supply circuit of the power supply. The secondary coil is serially connected with a diode to electrically connect with a load via a load... Agent: Rosenberg, Klein & Lee

20090273951 - Smart driving method for synchronous rectifier and its apparatus thereof: The present invention discloses a smart driving method for a secondary synchronous rectifier of an isolated converter and its apparatus thereof. The apparatus comprises: a main circuit having a secondary synchronous rectifier Q1; a differentiation filter circuit, filtering the drain-source voltage Vds of the secondary synchronous rectifier, comprising a capacitor... Agent: Perkins Coie LLP Patent-sea

20090273952 - Inverter with high frequency isolation transformer: An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC... Agent: Carlson, Gaskey & Olds, P.C.

20090273953 - Inverter: 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... Agent: Wei Te Chung Foxconn International, Inc.

20090273954 - Protection method, system and apparatus for a power converter: Among many embodiments, a power converter and a method for operating a power converter are disclosed. The power converter may include a pair of switches connected in series, an output transformer connected to a common node between the switches and a protection apparatus for protecting each switch from being hard... Agent: Neugeboren O'dowd PC

20090273955 - Optimum structure for charge pump circuit with bipolar output: A charge pump circuit with bipolar output comprises a first switch capable of selectively connecting a first input terminal of a transfer capacitor to a voltage source, a second switch capable of selectively connecting a first input terminal of a first storage capacitor to said first input terminal of said... Agent: Sinorica, LLC

20090273956 - Modular converter for converting the electric power produced by aerogenerators, and wind-power plant that uses said converter: A modular converter 30 for converting the electric power produced by aerogenerators, designed to be used within a wind-power plant, which is equipped with: input terminals 30a designed to be connected to an electric-power generator 3 of a single-phase or multiphase type; output terminals 30b; and control devices 36 for... Agent: Merchant & Gould PC

20090273957 - System and method for providing adaptive dead times: System and method for adaptively altering a power supply's dead time. A method comprises detecting a start of a dead time, detecting an ending condition of the dead time, and ending the dead time. The detecting of the ending condition is based on a first current flowing through a lower... Agent: Slater & Matsil LLP

20090273959 - Biased-mosfet active bridge with active gate drive: A transistor active bridge circuit (100) including first and second field-effect transistors (102, 104) of a first channel type, and third and fourth field-effect transistors (106, 108) of a second channel type that is different from the first channel type. The transistor active bridge circuit also includes a plurality of... Agent: Harris Corporation C/o Darby & Darby PC

20090273958 - Cat-ear power supply having a latch reset circuit: A cat-ear power supply is operable to generate a DC voltage and draws current from an AC power source near the beginning and end of a half-cycle of the AC power source. A controllably conductive switching circuit selectively charges an energy storage capacitor to produce the DC voltage and become... Agent: Lutron Electronics Co., Inc. Mark E. Rose

20090262555 - Current-mode controlled dc-dc converter: A current-mode controlled DC-DC converter includes a comparator comparing a first or second current detection signal with a first or second reference current that is based on an error voltage of a voltage detection signal, a pulse generator generating a first pulse signal whose ON time is longer than an... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, L.L.P.

20090262556 - H-bridge buck-boost converter: An H-bridge buck-boost converter includes a first half-bridge portion having at least one first transistor, an inductor portion connected to the first half-bridge portion at a first connection, a second half-bride portion connected to the inductor portion at a second connection, the second half-bridge portion having at least one second... Agent: Kenyon & Kenyon LLP

20090262557 - Bi-directional dc-dc converter: A bi-directional DC-DC converter includes a first series circuit connected to ends of a first DC power source and including a first winding of a first reactor and a first switch; a second series circuit connected to ends of the first switch and including a second winding of the first... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, L.L.P.

20090262558 - Switching power supply circuit and driving method thereof: A switching power supply circuit includes a direct current (DC) power supply input, a first transistor, a capacitor, a first resistor, a second resistor, a switching circuit including a second transistor, and a first transformer including a first primary winding and a secondary winding. The DC power supply input is... Agent: Wei Te Chung Foxconn International, Inc.

20090262559 - Semiconductor device, and energy transmission device using the same: A semiconductor device includes: a high breakdown voltage semiconductor element including a switching element and a JFET element; and a sense element. The sense element includes a first drift region of a first conductivity type, a first base region of a second conductivity type, a first source region of a... Agent: Mcdermott Will & Emery LLP

20090262560 - Current controlled synchronous rectifying drive circuit: A current controlled synchronous rectifying drive circuit including a current transducer ST having a primary winding connected in series with a synchronous rectifier SR and having a secondary winding to detect a current signal of a synchronous rectifier SR, a signal shaping and reset circuit connected to the secondary winding... Agent: Beusse Wolter Sanks Mora & Maire, P. A.

20090262561 - Method and apparatus to improve regulation of a power supply: Techniques are disclosed to regulate a power supply with a compensation signal generation circuit. One example regulated power supply includes a sense circuit coupled to sense an output voltage of the regulated power supply. The regulated power supply also includes a switching power converter circuit, which includes a switch coupled... Agent: Blakely Sokoloff Taylor & Zafman LLP

20090262562 - Efficiency improvement in power factor correction: An power converter that is operable to convert AC power into DC power that may be delivered to a load. The power converter includes a transformer and a controllable switch. The switching frequency of the power converter is configured to be dependent on the level of the AC voltage of... Agent: Marsh, Fischmann & Breyfogle LLP