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Electric power conversion systems September class, title,number 09/11

Below are recently published patent applications awaiting approval from the USPTO. Recent week's RSS XML file available below.
Listing for abstract view: USPTO application #, Title, Abstract excerpt,Patent Agent. Listing format for list view: USPTO National Class full category number, title of the patent application.
  
09/29/2011 > 18 patent applications in 15 patent subcategories. class, title,number

20110235367 - Dc to dc converter: A DC to DC converter includes an input terminal, an output terminal, first and second switches, an inductor, a smoothing unit, a first impedance element, a first resistor element, an operational amplifier and a control unit. The first switch is connected to the input terminal. The second switch is connected... Agent:

20110235369 - Synchronous rectifier post regulator: Methods and apparatus for regulating a synchronous rectifier DC-to-DC converter by adjusting one or more existing synchronous rectifiers in the converter are provided. By regulating an existing synchronous rectifier, the rectifier may function as a modulator for post regulation over a limited range of output voltages suitable for load regulation,... Agent:

20110235368 - System and method for conversion of high voltage ac to low voltage dc using input voltage gating: A method and apparatus for conversion of high voltage AC to low voltage high current DC without using high voltage capacitors or transformers. A single switch is used to perform both the functions of pre-regulation and switching conversion. An input voltage detector determines when the input power AC is below... Agent: Smartsynch, Inc.

20110235370 - High efficiency power converter: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty... Agent: Synqor, Inc.

20110235371 - Constant-current circuit capable of voltage compensation and zero-voltage switching: The present invention is to provide a constant-current circuit capable of voltage compensation and zero-voltage switching, wherein the constant-current circuit is a single-switch isolated flyback converter and includes a control circuit, a sensing resistor, a transformer, a voltage divider, and a primary-side power switch. The control circuit obtains information related... Agent: Skynet Electronic Co., Ltd.

20110235372 - Systems and methods for scaling a signal in a power factor correction circuit: Systems and methods for scaling a current signal in a power factor correction circuit are disclosed. An exemplary method may include providing a power factor correction circuit for a power supply, the power factor correction circuit having a first current sensing resistor connected on a return path to a rectified... Agent:

20110235373 - Active switching ripple filter: An active switching ripple filter system removes ripple currents from a power signal and has a main inverter and an active switching ripple filter inverter whose outputs are combined to form an output power signal.... Agent:

20110235374 - Stored energy dissipating circuits and methods for switched mode power supplies: A circuit includes a detector configured to detect a state of a power supply including an energy storage component and to generate a control signal responsive to the state of the power supply, a dissipating component, and a switch configured to controllably couple the dissipating component to the energy storage... Agent:

20110235375 - Apparatus having a converter: A device has a converter which is connected to a direct voltage circuit through a short-circuit protection unit. The short-circuit protection unit is arranged at least partially in the direct voltage circuit and is provided in the direct voltage circuit to suppress short-circuit current flowing through the converter. The device... Agent: Siemens Aktiengesellschaft

20110235376 - Multi-level parallel phase converter: A multi-level parallel phase power converter has a power source, a converter, and an electrical node. The converter includes multiple converter modules. Each of the converter modules has multiple multi-level power converters, a poly-phase interphase inductor, and a set of poly-phase power summing connections. The summed power of each of... Agent:

20110235377 - Circuit and method for generating an ac voltage from a plurality of voltage sources having a temporally variable dc output voltage: A circuit comprising at least one parallel-connected partial circuit for feeding at least one inverter circuit. A partial circuit consists of an unregulated voltage source having a temporally varying DC output voltage, a voltage doubling circuit and a voltage regulating circuit with an associated regulating device. In the inventive method,... Agent: Semikron Elektronik Gmbh & Co. Kg

20110235378 - Power supply system for electronic device: A power supply system includes an AC power source, a converter, a relay switch, and a waveform monitoring circuit. The AC power source provides an AC voltage. The converter is capable of converting the AC voltage into a DC voltage. The relay switch is connected between the AC power source... Agent: Hon Hai Precision Industry Co., Ltd.

20110235379 - Current sharing power system: A power system controller includes multiple channels and each channel has a current sharing controller that is coupled to a shared current signal bus and a shared voltage signal bus.... Agent:

20110235381 - Activation of a synchronous rectifier: A rectifier bridge circuit is described for rectifying the phase voltage generated by a generator, including a positive half-bridge having multiple rectifier elements and a negative half-bridge having multiple rectifier elements. The rectifier elements each have a controllable switch having a diode connected in parallel. A control circuit is provided... Agent:

20110235380 - Power conversion: Exemplary embodiments are directed to power conversion. A device may include a controllable switch coupled between an AC network and a DC network. The device may further include control circuitry configured to modify a configuration of the switch based on a detected difference between a reference signal and an output... Agent: Qualcomm Incorporated

20110235383 - Frequency synchronizing method for discharge tube lighting apparatus, discharge tube lighting apparatus, and semiconductor integrated circuit: An oscillator generates a triangular wave signal whose inclination for charging a capacitor and inclination for discharging the same are the same and which is used to turn on/off FETs Qp1 and Qn1. A signal generation part generates first drive signal in a period shorter than a half period of... Agent: Sanken Electric Co., Ltd.

20110235382 - High voltage inverter device: The high voltage inverter device receives, as an input voltage, a DC voltage or a voltage within Safety Extra Low Voltage composed of a DC component with a pulsating flow superposed thereon. The input voltage is switched by a switching element to pass an exciting current to excitation windings on... Agent: Tohoku Ricoh Co., Ltd.

20110235384 - Power converter and power conditioner: A power converter enhances conversion efficiency from DC power to AC power. A first chopper circuit chops DC voltage from a photovoltaic panel at a system frequency producing a first square-wave whose voltage level changes positively. A second chopper circuit chops the first square-wave at a frequency double the system... Agent: Omron Corporation

  
09/22/2011 > 16 patent applications in 15 patent subcategories. class, title,number

20110228564 - Gate drive circuit of the voltage drive type semiconductor element and power converter: A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative... Agent: Hitachi, Ltd.

20110228565 - Switchmode power supply for dimmable light emitting diodes: A power supply has a rectifier for producing a supply voltage from an AC source. A transformer includes a primary winding, a secondary winding, and an auxiliary winding, wherein the supply voltage is applied to the primary winding by a first switch. A controller, powered by voltage at a node,... Agent:

20110228566 - Series resonant converter with overload delay and short-circuit protection mechanisms: The present invention is to provide a series resonant converter with an overload delay and short-circuit protection mechanism, which includes a voltage sensing circuit for sensing a voltage ripple level on a primary side of a transformer thereof, that corresponds to a load on a secondary side of the transformer,... Agent: Skynet Electronic Co., Ltd.

20110228567 - Digital-to-analog converter to produce paired control signals in a power supply controller: An controller for use in a power supply includes a variable oscillator and a digital-to-analog converter (DAC). The variable oscillator generates a switching signal having an on-time and a switching period to control a first switch to regulate an output of the power supply. The DAC provides the variable oscillator... Agent: Power Integrations, Inc

20110228568 - Off-line converter with digital control: A circuit for regulating the level at a power converter output is disclosed. An example circuit includes an input for receiving a feedback signal. The feedback signal has a first feedback state that represents a level that is above a threshold level and a second feedback state that represents a... Agent: Power Integrations, Inc.

20110228569 - Switching power converter for reducing emi from ring oscillation and its control method: A switching power converter (200, 300, 400, 500) comprises a transformer (211) with a parasitic capacitance (212), a first switch (207) coupled to the transformer (211) and configured to couple or decouple a load (219) to or from a power source via the transformer (211), a switch controller (205) coupled... Agent: Iwatt Inc.

20110228570 - Switching mode power supplies with primary side control and associated methods of control: Switching mode power supplies with primary side control and associated methods of control are disclosed. In one embodiment, a signal with input voltage information and a signal with both input voltage information and output voltage information are provided to a subtracter to generate a feedback signal that is indicative of... Agent:

20110228571 - Primary side current controller and related power supply: A primary side current controller for a power supply is disclosed. The primary side current controller includes a waveform detection unit, a calculation unit, and a switching controller. The waveform detection unit is used for detecting a waveform signal of the power supply and generating a captured signal. The calculation... Agent:

20110228572 - Oscillator having time-variant frequency deviation and related power supply: An oscillator with time-variant frequency deviation for a power supply includes a signal generator for generating a first signal according to a clock signal and a comparing unit for adding an offset to at least one of the first signal and a threshold voltage corresponding to the first signal and... Agent:

20110228573 - Power supply device: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT... Agent:

20110228574 - Emi reduction circuit for active pfc converter: The present invention provides a technical solution to reduce electromagnetic interference generated by a high-frequency switching electronic circuit. By adding a disturbance signal whose amplitude varies with time to the input pin of the active power factor correction module of the high frequency switching electronic circuit which is intended to... Agent: Koninklijke Philips Electronics N.v.

20110228575 - Junction field effect transistor, integrated circuit for switching power supply, and switching power supply: A switching power supply has a start-up circuit that includes a field effect transistor (JFET), which has a gate region (a p-type well region) formed in a surface layer of a p-type substrate and a drift region (a first n-type well region). A plurality of source regions (second n-type well... Agent: Fuji Electric Systems Co., Ltd.

20110228576 - Mains plug component: The invention relates to a mains plug component with a housing and a mains switch component arranged in the housing comprising a first stage for rectifying a mains AC voltage and a second stage for generating a DC voltage from the rectified mains AC voltage. The first stage comprises an... Agent: Logicdata Electronic & Software Entwicklungs Gmbh

20110228577 - Optimizing operation of dc-to-ac power converter: In one embodiment, a power converter system includes an input terminal for receiving a DC input voltage. The power converter system delivers AC power to a load at an output terminal. A transformer is coupled between the input terminal and the output terminal. The transformer has a first winding, a... Agent:

20110228578 - Non-isolated dc-dc converter for solar power plant: An exemplary non-isolated DC-DC converter for a solar power plant, can be adapted to connect to a full-bridge inverter. The converter includes positive and negative input terminals, and positive and negative output terminals. A plurality of switches, diodes, inductors and capacitors are connected in a circuit configuration to the input... Agent: Abb Research Ltd.

20110228579 - Adjustable frequency generator and related power supply: An adjustable frequency generator for a power supply is disclosed. The adjustable frequency generator comprises a waveform generator, a voltage generator and a comparator. The waveform generator is used for generating a saw wave. The voltage generator is used for generating a variable upper reference voltage and a variable lower... Agent:

  
09/15/2011 > 15 patent applications in 14 patent subcategories. class, title,number

20110222313 - Power supply device and image forming apparatus: A power supply device includes a transformer including a primary coil, a secondary coil, and a tertiary coil; a switching element connected via the primary coil to a direct-current power supply; a first rectifying-and-smoothing circuit rectifying and smoothing a voltage generated in the secondary coil; a control circuit turning on... Agent: Ricoh Company, Ltd.

20110222314 - Power supply with reduced power consumption: A power supply includes an isolated power converter and a DC/DC converter. The isolated power converter includes a primary winding connected to a primary power stage, a secondary winding to generate a first output voltage, and an auxiliary winding at the primary side to generate a voltage signal proportional to... Agent: Richtek Technology Corp.

20110222315 - Current-sharing power supply apparatus: A current-sharing power supply apparatus is applied to regulate voltage level of an input DC voltage, and the regulated DC voltage is stabilized in a predetermined voltage to be used on rear-end circuits. The current-sharing power supply apparatus includes a square-wave generating circuit, a rectifier circuit, a conversion circuit, a... Agent: Chicony Power Technology Co., Ltd.

20110222317 - Converter circuit and unit and system comprising such converter circuit: A converter circuit has a first resonant converter that is connected on the DC voltage side to a first energy storage circuit, and a transformer. A second resonant converter is connected on the AC voltage side to the secondary winding of the transformer and on the DC voltage side to... Agent: Abb Research Ltd

20110222318 - Isolated switching power supply apparatus: A switching power supply apparatus includes a PFC converter, a DC-DC converter, and primary-side and secondary-side digital control circuits that control the PFC converter and the DC-DC converter. On the basis of a voltage detected by an output voltage detection circuit, the primary-side digital control circuit transmits data about the... Agent: Murata Manufacturing Co., Ltd.

20110222316 - Electrically insulated switching element driver and method for controlling same: An electrically insulated switching element driver includes: a pulse transformer driving unit into which a switching element driving signal and a duty signal are input and which drives, in accordance with the duty signal, a first or second pulse transformer that is selected depending on a state of the switching... Agent: Toyota Jidosha Kabushiki Kaisha

20110222319 - Switching power supply: A switching power supply includes a first auxiliary power supply for causing a first auxiliary winding of a transformer to induce voltage by ON/OFF control of a switching element connected to a primary winding of the transformer. The voltage induced by the first auxiliary winding charges a capacitor in the... Agent: Omron Corporation

20110222320 - Power conversion control with energy storage: A power generation system includes a renewable power source for producing source power; a source side converter for converting the source power to converted DC power; a source side controller for driving the converted DC power towards a maximum power point; a DC link for receiving the converted DC power;... Agent: General Electric Company

20110222321 - Power converter and method for controlling the same: An oscillation control part composed of a control switching element and a damping resistance connected in parallel is arranged between an input power supply and a main switching element of a power conversion circuit, and the control switching element and the main switching element have a relationship such as Ron(S2)<E(Rg)×fsw/(D×I2),... Agent: Kabushiki Kaisha Toshiba

20110222322 - Digital device with boot strap circuit stimulator: 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... Agent: Microchip Technology Incorporated

20110222323 - Power converter with distributed cell control: A device for converting a DC voltage into an AC voltage and vice versa comprises a control system to control the voltage conversion and at least one phase leg (1) with a first (Uvp1) voltage source connected in series between a first DC terminal (4) and a first AC terminal... Agent:

20110222324 - Control circuit, power conditioner including the control circuit, and photovoltaic system: A power conditioner of a photovoltaic system is configured operate at higher accuracy. A chopper circuit, a capacitor connected in parallel to the chopper circuit, and a control circuit that controls an ON/OFF status of switch elements in the chopper circuit to control charging and discharging of the capacitor are... Agent: Omron Corporation

20110222325 - Semiconductor device: A semiconductor device of a three-level inverter circuit with a reduced number of power supplies for driving IGBTs. The semiconductor device includes a series-connected circuit of IGBTs between P and N of a DC power supply and an AC switch element that is connected between a series connection point of... Agent: Fuji Electric Holdings Co., Ltd.

20110222326 - Variable duty cycle switching with imposed delay: Power conversion methods, systems, articles of manufacture, and devices are provided. The power conversion may include converting between direct current and alternating current wherein switching losses associated with latent electrical charges are reduced. Current sensing may be low-side bus reference. Solid-state implementations, code implementations, and mixed implementations are provided.... Agent: Solarbridge Technologies, Inc.

20110222327 - Photovoltaic inverter power system: A photovoltaic system may include a DC to AC inverter including a minimum operating power setting and a microprocessor for calculating a maximum available power output for a photovoltaic array.... Agent:

  
09/08/2011 > 12 patent applications in 10 patent subcategories. class, title,number

20110216557 - Inverter circuit: This inverter circuit includes first and second switching elements and an output transformer which is provided with a first primary winding connected in series between said first and second switching elements, and also with a secondary winding for obtaining an output voltage. The inverter circuit is further provided with a... Agent:

20110216558 - Power factor correction converter: A low-cost PFC converter capable of detecting an inductor current including a DC component and performing appropriate correction of a power factor with low loss includes a diode bridge that rectifies an AC voltage input from an AC input power supply Vac, a series circuit including an inductor and a... Agent: Murata Manufacturing Co., Ltd.

20110216559 - Constant-current control module using inverter filter multiplier for off-line current-mode primary-side sense isolated flyback converter: A fly-back AC-DC power converter has a constant-current control loop that senses the primary output current in a transformer to control the secondary output without an expensive opto-isolator. A primary-side control circuit can use either a Quasi-Resonant (QR) or a Pulse-Width-Modulation (PWM) control loop to switch primary current through the... Agent: Hong Kong Applied Science & Technology Research Institute Company Limited

20110216560 - Two stage isolated switch-mode ac/dc converter: An AC/DC two stage converter includes a non-isolated switch-mode regulated AC/DC voltage step-down first stage converter comprising an AC input and a first DC output. The AC voltage applied to the AC input is rectified and switch-mode regulated to a first DC voltage at the first DC output. The first... Agent:

20110216562 - Dc-to-dc power conversion: This disclosure includes systems and methods for managing the interaction between inverter-based DC and other power systems. In one embodiment, a 3-phase isolation transformer is fluxed to create a 3-phase rotating field from the output of a source inverter. An inductive filter turns that output into three sine waves. A... Agent: Mechanical Electrical Systems, Inc.

20110216561 - Low-inductance power semiconductor assembly: A power semiconductor assembly includes at least two bridge branches each including at least two circuit breakers connected to a phase output. Each of the circuit breakers has at least two parallel-connected switching elements integrated into a semiconductor chip. Each of the circuit breakers is arranged in a power semiconductor... Agent: Infineon Technologies Ag

20110216563 - Hemt/gan half-bridge circuit: A half-bridge circuit in accordance with an embodiment of the present application includes an input voltage terminal operable to receive an input voltage, a first bi-directional switch, a second bi-directional switch connected in series with the first bi-directional switch, wherein the first and second bi-directional switches are connected to the... Agent: International Rectifier Corporation

20110216564 - Eighteen pulse rectification scheme for use with variable frequency drives: An AC/DC converter system comprises an input circuit for connection to a three phase AC source. An isolation transformer comprises a set of primary windings and first and second sets of secondary windings magnetically coupled to the set of primary windings. The first and second sets of secondary windings are... Agent:

20110216565 - One-cycle controlled power factor correction method: A one cycle control method for power factor correction based on a boost circuit and a main control chip of system comprises the steps of: (1) Determining whether soft-start ends or not; if the soft-start ends, processing step (2) directly, if not, increasing reference value Uref of output voltage and... Agent: Gree Electric Appliances Inc. Of Zhuhai

20110216566 - Semiconductor device and method for manufacturing semiconductor device: In a rectifier circuit, by using a transistor whose off-state current is small as a so-called diode-connected MOS transistor included in the rectifier circuit, breakdown which is caused when a reverse bias is applied is prevented. Thus, an object is to provide a rectifier circuit whose reliability is increased and... Agent: Semiconductor Energy Laboratory Co., Ltd.

20110216567 - Single switch inverter: A novel concept of converting a DC input to an AC output with a single active switch is disclosed. A series of topologies are developed to support the needs of different applications. Particular requirements for driving modern lighting devices are also addressed and supporting solutions are elaborated.... Agent: Suntec Enterprises

20110216568 - System interconnection inverter: The present invention includes: an inverter 1 configured to perform pulse wide modulation on an output from a DC power source 5; a first capacitor pair 41 provided at an input side of the inverter and including two capacitors serially connected to form a neutral point; a second capacitor pair... Agent: Kabushiki Kaisha Toshiba

  
09/01/2011 > 13 patent applications in 11 patent subcategories. class, title,number

20110211369 - Low output voltage converter utilizing distributed secondary circuits: Embodiments of the present invention relate to a low-output voltage converter, delivering voltage power less than 1 VDC, utilizing distributed secondary circuits. In one embodiment of the present invention, there is provided a voltage converter comprises a primary circuit for receiving an input voltage, comprising a plurality of primary windings... Agent: Transistor Devices, Inc.

20110211370 - Systems and methods of resonant dc/dc conversion: Systems and methods of resonant DC/DC conversion disclosed herein improve the basic resonant converter designs by proactively setting and coordinating the gate drive timings between the primary side and secondary side. By proactively setting and coordinating gate drives timings between the primary side and secondary side, both efficiency and transient... Agent: Texas Instruments Incorporated

20110211371 - Dual drive system for transformer isolated half bridge and full bridge forward converters: The present invention relates to a power converter circuit for operating on a DC input voltage comprising a forward ferrite-core transformer having at least two primary windings and at least one secondary winding, at least one automatic switching device provided between the primary windings, a current sense circuit provided between... Agent:

20110211372 - Compensation circuits and control methods of switched mode power supply: A compensation circuit has a resistor, a switch and a compensation capacitor. The resistor and the switch are connected in series between a power node and a compensation node. The compensation capacitor is connected to the compensation node, whose voltage is responsive to the output power source. For a predetermined... Agent:

20110211373 - Method and apparatus to reduce audio frequencies in a switching power supply: An example controller for use in a power supply regulator includes a switch signal generator, a modulation circuit, and a multi-cycle modulator circuit. The modulation circuit modulates the duty cycle of a pulse width modulated switching signal to provide a fixed peak switching current in the switch during light load... Agent: Power Integrations, Inc.

20110211374 - Power supply device: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT... Agent:

20110211375 - Power factor correction converter: A power factor correction converter includes an output voltage error amplifier which functions as a proportioning device in a low-frequency range in order to stabilize the output voltage by feedback control and obtains a reference current amplitude value vm by multiplying an error ev between a desired output voltage value... Agent: Murata Manufacturing Co., Ltd.

20110211376 - Switching control circuit and switching power supply device: A switching control IC outputs a rectangular wave signal from an output terminal thereof to a driving circuit. A feedback circuit compares a value of a divided voltage of a voltage across output terminals of a switching power supply device with a reference voltage, generates a feedback signal, and inputs... Agent: Murata Manufacturing Co., Ltd.

20110211377 - Power factor correction converter: A PFC converter that rapidly and highly accurately detects current passing through an inductor so as to properly improve harmonics and the power factor as well as to correctly detect the operation state. In the PFC converter, a first current value is obtained by performing sampling at the middle portion... Agent: Murata Manufacturing Co., Ltd.

20110211378 - Utility for full wave rectified current-fed class of dc galvanically isolated dc-to-dc power conversion topologies allows reduction of working voltage magnitudes and improvement to efficiency for secondary circuits: New utility of an existing class of DC galvanically isolated current sourcing circuit topologies for power conversion simultaneously allows improvement in its secondary circuit(s) to power conversion efficiency and reduction in working voltage magnitudes, or simply reduction in working voltage magnitudes, with resulting benefits for reduction in manufacturing cost, reduction... Agent:

20110211379 - Power converter with reverse recovery avoidance: A power converter includes a reverse-recovery avoidance scheme. The power converter may include deliver current from a direct current (DC) power source to an alternating current (AC) load. A first switch and second switch of the power converter may be operated to supply the AC load with positive current respective... Agent: Solarbridge Technologies

20110211380 - Three-quarter bridge power converters for wireless power transfer applications and other applications: A three-quarter bridge power converter includes a first switch configured to selectively couple a switch node to a higher voltage. The power converter also includes a second switch configured to selectively couple the switch node to a lower voltage. The power converter further includes a third switch configured to selectively... Agent: National Semiconductor Corporation

20110211381 - Power converting apparatus: A neutral point clamped three-phase three-level inverter is connected to a first DC power supply and single-phase inverters are connected in series with AC output lines of individual phases of the three-phase three-level inverter such that sums of output voltages of the three-phase three-level inverter and output voltages of the... Agent: Mitsubishi Electric Corporation

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