Power Electronics

Patents

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BULK ACOUSTIC RESONATOR ELECTRICAL IMPEDANCE TRANSFORMERS

Issued December 21, 2010
United States Patent 7,855,618

An electrical impedance transformer comprises a first film bulk acoustic resonator (FBAR), having a first electrical impedance and a first resonance frequency. The electrical impedance transformer also comprises a second FBAR, having a second electrical impedance and a second resonance frequency, and being disposed over the first FBAR. The electrical impedance transformer also includes a decoupling layer disposed between the first and the second FBARs. The first electrical impedance differs from the second electrical impedance and the first and second resonance frequencies are substantially the same.

Inventors: Frank; Michael L. (Menlo Park, CA), Ruby; Richard C. (Menlo Park, CA), Jamneala; Tiberiu (San Francisco, CA)

Assignee: Avago Technologies Wireless IP (Singapore) Pte. Ltd. (Singapore, SG)

Appl. No.: 12/112,633

Filed: April 30, 2008

CIRCUIT AND METHOD FOR ADAPTIVE CURRENT LIMIT CONTROL IN A POWER CONVERTER

Issued December 21, 2010
United States Patent 7,855,539

A circuit includes a power converter configured to receive an input voltage and generate a regulated output voltage. The power converter includes an inductor. The circuit also includes a control loop configured to dynamically adjust a valley current limit of the power converter. The valley current limit identifies a minimum current through the inductor during a current-limited mode of operation. The regulated output voltage could be provided to a load configured to operate using the regulated output voltage. The control loop could be configured to dynamically adjust the valley current limit based on an average current through the inductor. The control loop could also be configured to dynamically adjust the valley current limit so that an output current reaches a desired average value during the current-limited mode of operation. The power converter could represent a buck converter, a boost converter, a buck-boost converter, or a hysteretic control power converter.

Inventors: Wong; Lik-Kin (Tai Po, HK), Man; Tze-Kau (Yuen Long, HK)

Assignee: National Semiconductor Corporation (Santa Clara, CA)

Appl. No.: 11/803,317

Filed: May 14, 2007

HIGH-VOLTAGE HIGH-POWER CONSTANT CURRENT LED DRIVER DEVICE

Issued December 21, 2010
United States Patent 7,855,515

A high-voltage high-power constant current LED driver device can drive LED cluster, comprises switch tube, current sensing resistor Rcs and inductor L, particularly, comprises a low voltage control circuit that detects the voltage drop on the said current sensing resistor Rcs to produce a control signal transmitting to the control terminal of the switch tube. The said current sensing resistor Rcs connects with inductor L in series and is positioned between the output terminal of switch tube and the current output terminal of the current driving device in series connection; the input terminal of the said switch tube is connected to a DC voltage source; and also comprises a diode D3 which the cathode is connected to the output terminal of the said switch tube and anti cathode is grounding. The device has the advantages of constant current, simpler driving circuit, and low cost under the high-voltage high-power application.

Inventors: Huang; Chaogang (Shenzhen, CN), Li; Yonghong (Shenzhen, CN)

Assignee: QX Micro Device Co., Ltd. (Shenzhen, CN)

Appl. No.: 12/178,746

Filed: July 24, 2008

MEDICAL DEVICE BATTERY PACK

Issued December 21, 2010
United States Patent 7,855,010

A system and method provides a status indicator to a battery pack of a medical device. The battery pack includes a power supply capable of being connected to the medical device. The battery pack also includes an indicator to automatically indicate a status of at least a portion of at least one of the battery pack and the medical device. For example, the indicator can indicate a status of the power supply.

Inventors: Vaisnys; Gintaras A. (Chicago, IL), Meier; Giovanni C. (Madison, CT), Laub; Glenn W. (Princeton, NJ)

Assignee: Defibtech LLC (Chicago, IL)

Appl. No.: 12/624,873

Filed: November 24, 2009

POWER SEMICONDUCTOR DEVICES HAVING TERMINATION STRUCTURES AND METHODS OF MANUFACTURE

Issued December 21, 2010
United States Patent 7,855,415

A semiconductor power device includes a drift region of a first conductivity type, a well region extending above the drift region and having a second conductivity type opposite the first conductivity type, an active trench extending through the well region and into the drift region, source regions having the first conductivity type formed in the well region adjacent the active trench, and a first termination trench extending below the well region and disposed at an outer edge of an active region of the device. The sidewalls and bottom of the active trench are lined with dielectric material, and substantially filled with a first conductive layer forming an upper electrode and a second conductive layer forming a lower electrode, the upper electrode being disposed above the lower electrode and separated there from by inter-electrode dielectric material. The first termination trench can be lined with a layer of dielectric material that is thicker than the dielectric material lining the sidewalls of the active trench, and is substantially filled with conductive material.

Inventors: Challa; Ashok (Sandy, UT), Lee; Jaegil (Puchon-Si, KR), Jung; Jinyoung (Kyunggi-do, KR), Jang; Hocheol (Kyoungki-do, KR)

Assignee: Fairchild Semiconductor Corporation (South Portland, ME)

Appl. No.: 12/032,123

Filed: February 15, 2008

ELECTRICAL ENERGY CAPTURE SYSTEM WITH CIRCUITRY FOR BLOCKING FLOW OF UNDESIRABLE ELECTRICAL CURRENTS THEREIN

Issued December 21, 2010
United States Patent 7,854,203

An electrical energy capture system, as may be carried on a hybrid energy, electro-motive, self-powered traction vehicle, is provided. The system may be used to storeelectrical power generated on the vehicle and for discharging the stored electrical power for use on the vehicle. The system includes circuitry connected to a plurality of electrical energy storage devices connected in parallel circuit to one another. The circuitry may be configured to establish a respective circuit path for charging and discharging electrical energy from each energy storage device with respect to a DC bus. The circuitry is further configured to block a flow of electrical current from any one of the storage devices to any of the other storage devices, thereby current flow that could otherwise circulate among the electrical energy storage devices due to electrical imbalances that may occur in one or more of the electrical energy storage devices.

Inventors: Kumar; Ajith Kuttannair (Erie, PA)

Assignee: General Electric Company (Schenectady, NY)

Appl. No.: 12/502,427

Filed: July 14, 2009

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