Power Electronics

Patents

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POWER FACTOR CORRECTION CONTROLLER WITH SWITCH NODE FEEDBACK

Issued February 15, 2011

United States Patent 7,888,922

A power control system includes a switching power converter and a power factor correction (PFC) and output voltage controller. The PFC and output voltage controller provides a control signal to a switch to control power factor correction and regulate output voltage of the switching power converter. During a single period of the control signal, the PFC and output voltage controller determines the line input voltage, the output voltage, or both using a single feedback signal received from the switching power converter. The feedback signal is received from a switch node located between an inductor and the switch. The PFC and output voltage controller determines either the line input voltage or the output voltage, using a second feedback signal received from either a PFC stage or a driver stage of the switching power converter.

Inventors: Melanson; John L. (Austin, TX)

Assignee: Cirrus Logic, Inc. (Austin, TX)

Appl. No.: 11/967,272

Filed: December 31, 2007

BUS BAR INTERCONNECTION TECHNIQUES

Issued February 15, 2011

United States Patent 7,888,601

One system of the present application includes an electronic assembly with a heat dissipating device, printed wiring board with electronic circuitry, bus bar, insulative grommet, and fastener. The board defines a bus with an interconnection pad and a board opening. The bus bar connects with the interconnection pad and defines a bar opening with a beveled shoulder portion that align with the board opening to define a passage to a fastening site of the heat dissipating device. The grommet defines a distal end portion opposite a proximal end portion shaped with a flange. The fastener extends through the grommet to provide a mechanical connection of the board and bar to the site and maintain thermal coupling between the board and device while the grommet electrically insulates the fastener from the bar.

Inventors: Bax; Randall L. (Andover, MN), Elayed; Karim (Plymouth, MN), Medina; Paul (W. St. Paul, MN)

Assignee: Cummins Power Generations IP, Inc. (Minneapolis, MN)

Appl. No.: 11/809,607

Filed: June 1, 2007

METHOD AND SYSTEM FOR CONTROLLING A POWER INVERTER IN ELECTRIC DRIVES

Issued February 15, 2011

United States Patent 7,888,905

Methods and systems for controlling a power inverter in an electric drive system of an automobile are provided. A signal controlling the power inverter is modified utilizing a first voltage distortion compensation method if a modulation index of the signal is less than a first modulation index value. The signal is modified utilizing a second voltage distortion compensation method if the modulation index is at least equal to the first modulation index value.

Inventors: Welchko; Brian A. (Torrance, CA), Schultz; Steven E. (Torrance, CA), Hiti; Silva (Redondo Beach, CA)

Assignee: GM Global Technology Operations LLC (Detroit, MI)

Appl. No.: 12/013,093

Filed: January 11, 2008

METHODS AND APPARATUS FOR A RESONANT CONVERTER

Issued February 15, 2011

United States Patent 7,889,519

Methods and apparatus for a dc-dc converter for operating at substantially fixed switching frequency, the converter including a rectifier, and a resonant inverter coupled to the rectifier, the resonant inverter including a switch and a reactive network having first, second, third and fourth energy storage elements, wherein an impedance magnitude at the output of the switch due to the reactive network has minima at dc and at a frequency near a second harmonic of the switching frequency.

Inventors: Perreault; David J. (Brookline, MA), Rivas; Juan M. (Auburndale, MA), Sagneri; Anthony D. (Cambridge, MA), Leitermann; Olivia (Arlington, MA), Han; Yehui (Cambridge,

Assignee: Massachusetts Institute of Technology (Cambridge, MA)

Appl. No.: 11/622,571

Filed: January 12, 2007

POWER SYSTEM WITH POWER CONVERTERS HAVING AN ADAPTIVE CONTROLLER

Issued February 15, 2011

United States Patent 7,889,517

A power system having a power converter with an adaptive controller. The power system is coupled to a load and includes a power system controller that receives a signal indicating a system operational state of the load and selects a power converter operational state as a function thereof. The power system also includes a power converter with a power switch that conducts for a duty cycle to provide a regulated output characteristic at an output thereof. The power converter also includes a controller that receives a command from the power system controller to enter the power converter operational state and provides a signal to control the duty cycle of the power switch as a function of the output characteristic and in accordance with the command, thereby regulating an internal operating characteristic of the power converter to improve an operating efficiency thereof as a function of the system operational state.

Inventors: Artusi; Daniel A. (Austin, TX), Fosler; Ross (Buda, TX), Rozman; Allen F. (Murphy, TX)

Assignee: Flextronics International USA, Inc. (San Jose, CA)

Appl. No.: 12/716,963

Filed: March 3, 2010

APPARATUS AND METHOD CONFIGURED TO LOWER THERMAL STRESSES

Issued February 15, 2011

United States Patent 7,888,782

An apparatus and a method configured to lower thermal stress is disclosed. One embodiment provides a semiconductor chip, a lead frame and a layer structure. The layer structure includes at least a diffusion solder layer and a buffer layer. The layer structure is arranged between the semiconductor chip and the lead frame. The buffer layer includes a material, which is soft in comparison to a material of the diffusion solder layer, and includes a layer thickness such that thermal stresses in the semiconductor chip remain below a predetermined value during temperature fluctuations within a temperature range.

Inventors: Nelle; Peter (Munich, DE), Stecher; Matthias (Munich, DE)

Assignee: Infineon Technologies AG (Neubiberg, DE)

Appl. No.: 11/925,268

Filed: October 26, 2007

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