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Electric power conversion systems January USPTO class listing 01/08

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.
01/31/2008 > patent applications in patent subcategories.

20080025049 - Wide input range power supply: A series resonant converter (SRC) power supply with a wide input range and high efficiency is achieved by using both frequency control of the SRC and phase control of phase differences between a voltage signal inside the SRC and a voltage signal inside a synchronous/asynchronous rectifier coupled to the SRC.... Agent: Dr. Mark M. Friedman C/o Bill Polkinghorn - Discovery Dispatch

20080025050 - Wide input range power supply: A series resonant converter (SRC) power supply with a wide input range and high efficiency includes at least one SRC connected to a respective at least one synchronous/asynchronous rectifier operative to receive phase control. Efficient power conversion in a wide input voltage range of about 1:11 is achieved by using... Agent: Dr. Mark M. Friedman C/o Bill Polkinghorn - Discovery Dispatch

20080025051 - Low voltage stress power converter: A circuit used to convert a DC input to an AC output comprises a pair of series circuits, one or two capacitors, and one transformer. Each of the series circuits is in parallel with the DC input and comprises a pair of series-connected switches and at least one transformer primary.... Agent: Birch Stewart Kolasch & Birch

20080025054 - Method and apparatus providing protection for power converter: The invention presents a surge output protection for a control circuit of power converter. It comprises an input circuit for generating a threshold signal. A first comparator is coupled to receive a signal representative the current through a power switch. The first comparator further generates a control signal in response... Agent: Jianq Chyun Intellectual Property Office

20080025055 - Inverter circuit: An inverter circuit is configured with a reduced number of components for driving a plurality of discharge tubes. Primary coils of a plurality of drive transformers are respectively connected in series to primary coils of corresponding balancer-transformers, and then connected between output terminals of a switching circuit in parallel. The... Agent: Coats & Bennett, PLLC

20080025056 - Power factor correction circuits: Power factor correction circuits are provided, in which a boosting converter comprises a switching element and an inductor, to convert a rectified voltage to a DC output voltage. An adjustment unit comprises a thermister with positive temperature coefficient, to generate an adjustment signal according to a present temperature and the... Agent: Quintero Law Office, PC

20080025052 - Switching power supply circuit: The present invention provides a switching power supply circuit which may include a rectifying and smoothing section, a converter section, and a power factor improving section. The rectifying and smoothing section may include a primary side rectifying element and a smoothing capacitor. The converter section may include a choke coil,... Agent: Lerner, David, Littenberg, Krumholz & Mentlik

20080025053 - Uninterruptible power supply with transient suppression: A power supply system with transient suppression includes an uninterruptible power supply (UPS). A power conditioning circuit is coupled to the UPS for conditioning power supplied by a power source at a nominal frequency over line, neutral, and ground conductors, respectively. The power conditioning circuit includes first, second, and third... Agent: Mccracken & Frank LLP

20080025057 - Plasma display apparatus: A PDP apparatus comprises, in a circuit part, a ramp output device which outputs a ramp wave to electrodes of a PDP. The ramp output device has a ramp generator which generates and outputs a first ramp wave of which inclination is variable, an impedance conversion circuit which receives the... Agent: Antonelli, Terry, Stout & Kraus, LLP

20080025058 - Automatic power adapter: An electrical device for automatically combining two input power source supply circuits with either aligned or unaligned phases, into a single operational circuit, with an output load capacity totaling approximately the sum of the two lower capacity power supply circuits. The device and adapters, through a series of coupled relays... Agent: Malin Haley And Dimaggio, Pa

01/24/2008 > patent applications in patent subcategories.

20080019153 - Protection device for a converter and related method: A protection device for a converter includes at least one power switch that operates for a first time period from the time the overload or short-circuit in the converter has been detected. The protection device includes circuitry to control the power switch to minimize the power deliverable by the converter... Agent: Hogan & Hartson LLP

20080019155 - Uninterruptible power supply with low leakage current: An uninterruptible power supply having a controllable leakage current is disclosed. The leakage current is controlled by adjusting a switching speed (i.e., dV/dt rate) of switches in the output inverter (i.e. DC-AC converter stage). Leakage current can be reduced by reducing the switching speed (dV/dt rate) of the output inverter... Agent: Watchstone P+d, PLC

20080019156 - Common mode noise reduction circuit utilizing dual primary windings: A common mode noise cancellation circuit eliminates common mode noise generated by a high-frequency switching device. The common mode noise reduction circuit includes a single switching device and a transformer. The switching device receives a rectified voltage and produces a switched voltage. The transformer includes a first primary winding, a... Agent: Pillsbury Winthrop Shaw Pittman LLP

20080019161 - Switching mode power supply and method of operation: In one embodiment, a switching mode power supply (SMPS) includes a rectifier for generating an input DC voltage from an input AC voltage. A switching transistor, coupled to a primary coil of a transformer, converts the input DC voltage and supplies power to a secondary side of the transformer according... Agent: Sidley Austin LLP

20080019154 - Power factor correction control circuit: A bi-directional boost circuit for power factor correction includes a power factor control circuit and a pair of diodes, a pair of inductors, and a pair of switches. A first diode, a second diode, a first inductor, a second inductor, a first switch, and a second switch convert the AC... Agent: Pillsbury Winthrop Shaw Pittman LLP

20080019157 - Method for starting pulse width modulation: A method for starting the modulation of a frequency converter, which method comprises the steps of receiving reference voltage (sa, sb, sc; Uref), generating output switch commands from the reference voltages. The generation of output switch commands comprises further a step, in which the ratio (dz) of active time (T0+)... Agent: Buchanan, Ingersoll & Rooney PC

20080019158 - 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

20080019159 - Amplifier circuits in which compensation capacitors can be cross-connected so that the voltage level at an output node can be reset to about one-half a difference between a power voltage level and a common reference voltage level and methods of operating: A switch circuit includes a first capacitor, a second capacitor, and a switch arrangement that is operable to connect the first capacitor and the second capacitor in series between a first node that supplies a first voltage level and a second node that supplies a second voltage level, or to... Agent: Myers Bigel Sibley & Sajovec

20080019160 - Dc/dc converter: A DC/DC converter includes a switching element which is opened and closed to supply power from an input power supply VCC, through a coil to an output terminal, which is connected to a load, and to adjust the voltage at the output terminal. The DC/DC converter also includes a coil... Agent: Rohm Co., Ltd. C/o Keating & Bennett, LLP

01/17/2008 > patent applications in patent subcategories.

20080013343 - Method and apparatus for a high voltage power supply circuit: A high voltage power supply method and apparatus is disclosed. An apparatus according to aspects of the present invention includes a power supply circuit having a rectifier circuit coupled to input terminals of the power supply circuit that are to be coupled to receive an AC input voltage. A switchmode... Agent: Blakely Sokoloff Taylor & Zafman

20080013345 - Dc-dc converter and power supply apparatus: Disclosed is a DC-DC converter including: an inductance element and a rectifier element connected in series between a voltage input terminal to accept input direct current voltage and a first output terminal; a switching element connected between a connection node of the inductance element and the rectifier element and a... Agent: Frishauf, Holtz, Goodman & Chick, PC

20080013350 - Planar transformer power supply: A planar transformer power supply for an electrosurgical device to minimize stray capacitance comprising a step down/step-up isolation transformer and circuitry to limit the effects of a short circuit in the output of the planar transformer power supply on the input to the planar transformer power supply to enhance power... Agent: Arthur W. Fisher, Iii Ste. 316

20080013344 - Ac power supply apparatus: An AC power supply apparatus used for an AC load of a high voltage such as a cold cathode tube. When a cold cathode tube is caused to emit a light, a DC voltage is on/off controlled at a predetermined ratio; thereafter, an AC signal of a high frequency is... Agent: Staas & Halsey LLP

20080013346 - Active clamp resonance control: According to some preferred embodiments, power converter includes a comparator circuit with feedback from current-fed PI or PID control to select one of two regeneration times of at least one active clamp: i) wherein at low loads a regeneration circuit is turned ON for substantially an entire current-transfer cycle such... Agent: Watchstone P+d, PLC

20080013347 - Method and apparatus for adjusting wakeup time in electrical power converter systems and transformer isolation: An electrical power converter system adjusts a wakeup voltage periodically, to permit earlier connection and/or operation, to increase performance. The electrical power converter system selects between a mathematically adjusted wakeup voltage based on at least one previous period, and a table derived wakeup voltage that takes into account historical information.... Agent: Siemens Corporation Intellectual Property Department

20080013348 - Adjustable speed drive protection: A protection scheme to protect pulse width modulated drives is described. The scheme is implantable in both hardware and software and combinations thereof. The semiconductor devices of the drive are protected from transient signals such as power line spikes and loss of line. The present scheme uses an adaptive technique... Agent: Attention: Susan M. Donahue Rockwell Automation, Inc.

20080013349 - Step-up circuit and portable device using it: According to the invention, as an input voltage of a certain step-up unit of a plurality of stages of step-up units, a stepped-up output of a step-up unit in a stage preceding the certain step-up unit is inputted. This makes it possible to increase the level of a voltage stepped... Agent: Fish & Richardson P.C.

20080013351 - Universal power converter: Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which alternately connect an inductor and parallel capacitor between said portals, such... Agent: Groover & Associates

20080013352 - Active rectifier system with power factor correction: A polyphase alternating current (AC) active rectifier system converts polyphase AC from an AC source to direct current (DC) on a DC bus comprising a positive DC bus line and a negative DC bus line with a switching element for each phase configured to direct current from the AC source... Agent: Stephen George Mican

20080013353 - Frequency converter assembly and method of using frequency converter assembly: A frequency converter assembly comprising a direct-voltage circuit and brake chopper means, the direct-voltage circuit including a first branch (DC+) and a second branch (DC−), and the brake chopper means including a first terminal (BRK+), a second terminal (BRK−), a brake chopper switch (S1) and control means (2). The brake... Agent: Buchanan, Ingersoll & Rooney PC

01/10/2008 > patent applications in patent subcategories.

20080007976 - Power supply device and electric appliance provided therewith: A power supply device has a transformer 1; Tr2 that is serially connected to a winding Np; a first circuit 3 that turns on Tr2 by using Vi and Vd; Tr4 that turns on so as to turn off Tr2; a second circuit 5 that turns on/off Tr4 by using... Agent: Fish & Richardson P.C.

20080007977 - Switch mode power supply systems: Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A module senses a current in a primary winding of a transformer and a voltage on a primary or auxiliary winding of the transformer, and which includes a multiplier... Agent: Schwegman, Lundberg & Woessner, P.A.

20080007978 - Dc power transmisson system of voltage source converter using pulse-interleaving auxiliary circuit: In accordance with the present invention, the normal transformer is used instead of a tapped transformer to reduce the size thereof and to obtain an accurate transformer ratio, the 3-level half bridge is used instead of the H-bridge to reduce the switching loss in order to increase the number of... Agent: The Webb Law Firm, P.C.

20080007979 - Inverter, backlight assembly and image display device having the same: A DC/AC inverter for a backlight can include a support, a printed circuit board (PCB) on the support, a transformer on the PCB, and a blocking member formed on at least a portion of at least one side of the transformer. The blocking member can be formed of a ferrite... Agent: Saliwanchik Lloyd & Saliwanchik A Professional Association

20080007980 - Power supply apparatus including charge-pump type step-up circuit having different discharging time constants: In a power supply apparatus, a charge-pump type step-up circuit is adapted to charge a step-up capacitor by a power supply voltage, step up a charged voltage of the step-up capacitor using a charge-pump operation, and discharge a stepped-up voltage to a smoothing capacitor. A regulator has a first comparator... Agent: Young & Thompson

20080007981 - Voltage converter: A voltage converter comprises an input terminal receiving a DC input voltage, an output terminal outputting an output voltage, a first switch coupled between a first node and the input terminal, a second switch coupled between the input terminal and a second node, a first capacitor coupled between the first... Agent: Birch Stewart Kolasch & Birch

20080007982 - Switch mode power supply systems: Methods and apparatus for sensing the output current in a switch mode power supply (SMPS) using primary side sensing are described. A system includes a primary current sense input, a charge input to sense a charging time of an SMPS transformer; a discharge input to sense a discharging time of... Agent: Schwegman, Lundberg & Woessner, P.A.

20080007973 - Power converter circuit for a high-voltage direct voltage connection: A power converter circuit for converting a multi-phase alternating voltage into a high-voltage direct voltage and then into a second multi-phase alternating voltage. The circuit comprises first and second cascades of power converter cells, each cascade having first terminals on a transformer side and second terminals on a direct voltage... Agent: Cohen, Pontani, Lieberman & Pavane

20080007974 - Method for operating a converter circuit, and apparatus for carrying out the method: A method is disclosed for operating a converter circuit, with the converter circuit having a converter unit with a plurality of drivable power semiconductor switches and an LCL filter connected to each phase connection of the converter unit, in which the drivable power semiconductor switches are driven by means of... Agent: Buchanan, Ingersoll & Rooney PC

20080007975 - Switching power supply: A switching power supply, in which a switching element turns on and off electric current flowing on the primary side of an output transformer so as to rectify and output a pulsating flow generated on the secondary side of the output transformer, includes a voltage detecting section that detects an... Agent: Rabin & Berdo, PC

20080007983 - Frequency-to-voltage converter with analog multiplication: A circuit and method are provided for supplying a DC output signal having a magnitude that is proportional to the mathematical product of a variable frequency AC signal and a variable magnitude DC signal. The method implemented by the circuit includes converting the variable frequency AC signal to a first... Agent: Honeywell International Inc.

20080007984 - Control circuit for power converter and power converter using the same: A control circuit for a power converter and the power converter using the control circuit are provided. The power converter includes an energy-storing inductor. The control circuit includes a first switch component and a duty cycle control circuit. The first switch component is coupled to the energy-storing inductor to control... Agent: Jianq Chyun Intellectual Property Office

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