Power Electronics

Patents

CONTROLLER FOR A POWER CONVERTER AND METHOD OF OPERATING THE SAME

Issued April 21, 2009

U.S. Patent 7,521,907

Cervera, et al

A controller for use with a power converter, including a switch configured to conduct to provide a regulated output characteristic at an output of the power converter, and method of operating the same. In one embodiment, the controller includes a linear control circuit coupled to the output configured to provide a first control signal for the switch as a function of the output characteristic. The controller also includes a nonlinear control circuit coupled to the output configured to provide a second control signal for the switch as a function of the output characteristic. The controller is configured to select one of the first and second control signals for the switch in response to a change in an operating condition of the power converter.

Inventors: Cervera, Pedro Alou (Madrid, Spain); Marquez, Jose Antonio Cobos (Madrid, Spain); Lotfi, Ashraf W. (Bridgewater, N.J.); del Pecho, Andres Soto (Madrid, Spain)

Assignee: Enpirion Inc. (Bridgewater, N.J.)

Appl. No.: 11/368,559

Filed: March 6, 2006

UNINTERRUPTIBLE POWER SUPPLY

Issued April 21, 2009

U.S. Patent 7,521,823

Klikic, et al

An uninterruptible power supply (UPS) system includes an ac power input configured to receive ac power from a single-phase ac power source or a multiphase ac power source, a dc power source, an output circuit including a power output, a controllable switch configured to selectively couple at least one of the ac power input and the dc power source to the output circuit, and a processor coupled and configured to affect operation of the output circuit depending upon which of single-phase and multiphase operation of the UPS is indicated.

Inventors: Klikic, Damir (Waltham, Mass.); Beg, Mirza A. (Pepperell, Mass.); Melanson, Mark R. (Chelmsford, Mass.);Kotlyar, Edward (Needham, Mass.); Samstad, Jeffrey B. (Brookline, Mass.)

Assignee: American Power Conversion Corp. (West Kingston, R.I.)

Appl. No.: 11/779,109

Filed: July 17, 2007

HYBRID VEHICLE WITH COMBUSTION ENGINE/ELECTRIC MOTOR DRIVE

Issued April 21, 2009

U.S. Patent 7,520,354

Morrow, et al

A vehicle including a prime mover, a generator mechanically coupled to the prime mover, a first multi-input drive unit having at least first and second rotational inputs and at least one rotational output wherein the first rotational input is coupled to the prime mover, a first electric motor mechanically coupled to the second rotational input and electrically coupled to the generator, and a first pair of vehicle drive wheels coupled to the rotational output.

Inventors: Morrow, Jon J. (Neenah, Wis.); Yakes, Christopher K. (Oshkosh, Wis.)

Assignee: Oshkosh Truck Corp. (Oshkosh, Wis.)

Appl. No.: 10/137,585

Filed: May 2, 2002

METHOD FOR OPERATION OF A CONVERTER CIRCUIT AND AN APPARATUS FOR CARRYING OUT THE METHOD

Issued April 14, 2009

U.S. Patent 7,518,893

Ponnaluri, et al

A method for operation of a converter circuit is specified, wherein the converter circuit has a converter unit with a multiplicity of drivable power semiconductor switches and an LCL filter that is connected to each phase connection of the converter unit in which method the drivable power semiconductor switches are driven by means of a drive signal that is formed from reference voltages. The reference voltages are formed by subtraction of damping voltages from reference-phase connection voltages, with the damping voltages being formed from filter capacitance currents, weighted with a variable damping factor of the LCL filter.

Inventors: Ponnaluri, Srinivas (Untersiggenthal, Switzerland), Steinke; Jurgen (Albbruck, Germany)

Assignee: ABB Schweiz AG (Baden, Switzerland)

Appl. No.: 11/826,480

Filed: July 16, 2007

MULTIPHASE SOFT-SWITCHED DC-DC CONVERTER AND ACTIVE CONTROL TECHNIQUE

Issued April 14, 2009

U.S. Patent 7,518,886

Lai, et al

DC-DC converter has a transformer with primary coils connected to an input side and secondary coils connected to an output side. Each primary coil connects a full-bridge circuit comprising two switches on two legs, the primary coil being connected between the switches on each leg, each full-bridge circuit being connected in parallel wherein each leg is disposed parallel to one another, and the secondary coils connected to a rectifying circuit. An outer loop control circuit that reduces ripple in a voltage reference has a first resistor connected in series with a second resistor connected in series with a first capacitor, which are connected in parallel with a second capacitor. An inner loop control circuit that reduces ripple in a current reference has a third resistor connected in series with a fourth resistor connected in series with a third capacitor, which are connected in parallel with a fourth capacitor.

Inventors: Lai, Jih-Sheng (Blacksburg, Va.); Liu, Changrong (Sunnyvale, Calif.); Ridenour, Amy (Salem, Va.)

Assignee: Virginia Tech Intellectual Properties, Inc. (Blacksburg, Va.)

Appl. No.: 11/249,945

Filed: Oct. 13, 2005

POWER SUPPLY SYSTEM AND APPARATUS

Issued April 28, 2009

U.S. Patent 7,525,821

Hansson, et al

The invention relates to a switched-mode power supply with programmable digital control and to a power supply system comprising a plurality of switched-mode power supplies. The input terminals and the output terminals of the switched-mode power supply system are separated by an insulation barrier, and the switched-mode power supply comprises a conversion stage having at least one switching element. The switching element of the conversion stage and any switching elements of a possible pre-regulator is digitally controlled by a programmable digital circuit.

Inventors: Hansson, Anders (Stockholm), Sahlstrom, Thomas (Huddinge, Sweden); Ma, Jun (Farsta, Sweden); Andersson, Mattias (Stockholm)

Assignee: Emerson Energy Systems, AB (Stockholm)

Appl. No.: 12/057,682

Filed: March 28, 2008

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