Power Electronics

Recent U.S. Power Electronics Patents

More detailed information may be found at the Patent Office Web site: http://www.uspto.gov. Click on "Searchable Databases," then "Patent Full-Text Database with Full-Page Images," then "Patent Number Search." Enter the patent number shown below, and then choose "Full-Text Search," followed by "Images."

Energy storage and conversion apparatus 6,150,742 November 21, 2000 This energy storage and conversion apparatus comprises a containment defining a vacuum chamber, a substantially vertical shaft within the vacuum chamber, a stator on the shaft, and a cylindrical rotor. The rotor is driven by the stator to store energy as kinetic energy of the rotor and acts with the stator as a generator to release energy. The rotor is then supported by the shaft via an end cap, positioned at the upper end of the cylindrical rotor, which engages the shaft. The rotor is suspended from a pin bearing which is attached to an end cap. The pin bearing sits in a bearing cup mounted in a damper at the end of the shaft. A magnet bearing is provided at the lower end of the rotor to assist in positioning the rotor relative to the stator.

Inventors: Horner; Roger Eric; Tarrant; Colin David; Crombie; Ian; Barker; Geoffrey Martin; Hayward; David Stephen (Warrington, Great Britain).

Assignee: British Nuclear Fuels PLC (Risley, Great Britain).

Single-stage power converter/operating method 6,144,564 November 7, 2000 A single-stage power converter has a method of processing rectified ac power, and a power supply incorporating the converter or the method. The converter is couplable via a rectifier to a source of ac power.

It has a filter capacitor and an isolation transformer with a primary winding, and includes: a significant energy storage device coupled to the primary winding, a first switch, coupled to the primary winding, which conducts intermittently to couple the primary winding to the rectifier to transfer a portion of rectified ac power to a magnetizing inductance of the isolation transformer. A second switch, coupled between the primary winding and the significant energy storage device, that conducts alternately with the first switch. The first and second switches zero-voltage switching, and the converter corrects a power factor of the AC power.

Inventors: Fraidlin; Simon (Plano, Texas); Frolov; Andrey (Moscow); Polikarpov; Anatoliy (Mesquite, Texas)

Assignee: Lucent Technologies Inc. (Murray Hill, N.J.)

Power inverter with series connections 6,144,046 November 7, 2000 This inverter apparatus has one or more series connections of plural semiconductor devices. Each have a pair consisting of an insulated gate bipolar transistor (IGBT), and a diode, both of which are in a reverse parallel connection with each other. The resistivity of the base layer of the lowest impurity concentration in the diode is lower than that of the base layer of the lowest impurity concentration in the IGBT, and wherein a breakdown voltage of the IGBT at the time of switching from a conduction state to a blocking state is lower than a breakdown voltage of the IGBT and diode at the time of the blocking state.

Inventors: Hanaoka; Koumei; Sakurai; Naoki (Hitachi, Japan); Mori; Mutsuhiro (Mito, Japan)

Assignee: Hitachi, Ltd. (Tokyo)

Converter arrangement for ship structure 6,142,090 November 7, 2000 This power converter unit contains a series of enclosures mounted on a platform that is supported from a ship's hull structure by isolation mounts. Each enclosure includes power conversion modules and is supplied with power cables, cooling liquid pipes, and control lines from a panel forming a back wall of the enclosure. The power converter modules are supported in the enclosure for displacement out of the enclosure for inspection and testing. Flexible power cables, cooling liquid pipes, and control lines are provided to facilitate testing and inspection.

Inventors: Jakuba; Jeffrey B. (Ledyard, Conn.); Thaxton; Edgar S. (Bradford, R.I.)

Assignee: Electric Boat Corporation (Groton, Conn.)

Valley-fill power factor correction circuit 6,141,230 October 31, 2000 This valley-fill power factor correction circuit includes a rectifying circuit connected to a charge storage circuit. There is a voltage doubler circuit disposed between the rectifying circuit and charge storage circuit.

The voltage doubler circuit performs the function of filling the normally truncated input current waveform. As arranged, the input current waveform can be substantially maintained with less distortion resulting in a Fourier transform in compliance with the IEC specifications.

Inventor: Sum; K. Kit (Milpitas, Calif.)

Assignee: Broadband Telcom Power, Inc. (Santa Ana, Calif.)

Modular power electronics die with cooling apparatus 6,141,219 October 31, 2000 A modular power electronics die cooler is designed for use with a coolant manifold adapted to circulate a coolant medium past a mounting receptacle. The modular power electronics die cooler comprises a base unit adapted for mounting to the manifold, with the base unit having an upper portion and a lower portion. The upper portion includes a plurality of sidewalls defining an enclosure, and the lower portion includes a heat sink, adapted for insertion in the manifold receptacle. At least one electronic component is mounted within the enclosure. Accordingly, upon mounting the base unit to the manifold, the heat sink is positioned in the coolant medium and thereby dissipates heat produced by the electronic component.

Inventors: Downing; Robert Scott; Wilkinson; Scott Palmer; Sutrina; Thomas Albert (Rockford, Ill.)

Assignee: Sundstrand Corporation (Rockford, Ill.)

Thin magnetic element and transformer 6,140,902 October 31, 2000 The thin magnetic element is comprised of a coil pattern formed on at least one side of a substrate and a thin magnetic film formed on the coil pattern. A thin magnetic film is formed to a thickness of 0.5 mm to 8 mm - assuming the thickness and width of a coil conductor constituting the coil pattern are t and a.

Respectively, an aspect ratio t/a of the coil conductor satisfies the following relationship: 0.035.ltoreq.t/a.ltoreq.0.35; and assuming that the width of the conductor constituting the coil pattern is a and the distance between the mutually adjacent coil conductors in the coil pattern is b, the following relationship: 0.2.ltoreq.a/(a`b) is satisfied.

Inventors: Yamasawa; Kiyohit; Hayakawa; Yasuo; Hatanai; Takashi; Makino; Akihiro; Naito; Yutaka; Hasegawa; Naoya (Niigata-ken, Japan)

Assignee: Alps Electric Co., Ltd. (Tokyo)

Autonomous battery equalization circuit 6,140,800 October 31, 2000 A battery equalization circuit for equalizing charge between at least first and second series connected batteries includes a switching circuit and a resonant circuit. The positive end of the second battery is coupled to the negative end of the first battery at a common node.

The switching circuit is connectable at a positive node and at a negative node. The resonant circuit is connectable between the switching circuit and the common node of the batteries, wherein the switching circuit is adapted to alternately couple the resonant circuit in parallel with the first and second batteries such that a dc current component flows between the first and second batteries through the resonant circuit as a function of a charge imbalance there between.

Inventors: Peterson William; Anders, N.Y.

Preconditioner with digital PF controller 6,140,777 October 31, 2000 This ballast preconditioner, serving as a boost regulator, includes a power factor controller. The preconditioner also includes a capacitor for producing a substantial dc voltage and a switch for controlling the amount of energy stored in the capacitor in response to a switching signal. The power factor controller includes a waveform generator with a look-up table for storing values of at least one waveform.

The switching signal produced by the power factor controller is based on the at least one waveform accessed from the look-up table.

Inventors: Wang; Shenghong (Yorktown Heights, N.Y.); Wacyk; Ihor T. (Briarcliff Manor, N.Y.); Giannopoulos; Demetri J. (Norwalk, Conn.)

Assignee: Philips Electronics North America Corporation (New York)

Reference-free, single-ended sense amplifier 6,137,319 October 24, 2000 This sense amplifier includes first and second transistors in a differential pair. The first transistor has a control terminal connected to an input conductor to receive an intermediate signal and data terminal connected to a node.

The second transistor has a control terminal coupled to the node. The sense amplifier includes a cross-coupled inverter latch with a first inverter coupled to the first transistor through the node and a second inverter coupled to the second transistor. In some embodiments, the control terminal of the second transistor is tied to the node.

The first and second transistors of the differential pair may be pFET transistors, nFET transistors, or combination of the two. In some cases, the sense amplifier is includes as a part of a domino logic gate. Other embodiments are described and claimed.

Inventors: Krishnamurthy; Ram K. (Beaverton, Ore.); Alvandpour; Atila (Linkoping, SE); Spotten; Reed D. (Hillsboro, Ore.)

Assignee: Intel Corporation (Santa Clara, Calif.)

Switching dc/dc converter and conversion method 6,137,274 October 24, 2000 This invention implements current sharing between channels of a dc-to-dc converter using simple circuitry external to the controller chip (without an external bus which connects one channel to the other), and with simple, silicon-area efficient circuitry internal to the controller chip. Preferably, current mirror circuitry in the controller chip generates a set of identical average current signals - each of which is proportional to the average of the currents drawn from the individual channels. Additional current mirror circuitry generates a set of identical error current signals - each of which is an error current proportional to the difference between the dc-to-dc converter's output potential and a reference potential. The dc-to-dc converter achieves a desired output potential with increased current sharing among the the channels.

Inventors: Rajagopalan; Jayendar (Santa Clara, Calif.)

Assignee: National Semiconductor Corporation (Santa Clara, Calif.)

Long-time-averaged battery charging rate 6,137,268 October 24, 2000 This battery charging system averages current over a long time period (seconds), determining the maximum average charging rate. When the integral of charging current reaches the programmed maximum charge value for one period, current is simply cut off for the remainder of the fixed long period.

Inventors: Mitchell; Nathan (The Woodlands, Texas); Freiman; Joseph F. (Cypress, Texas)

Assignee: Compaq Computer Corp. (Houston, Texas)

Latch-up controllable IGBT with thyristor structure 6,137,122 October 24, 2000 A latch-up controllable insulated gate bipolar transistor (IGBT) is formed with a thyristor structure. The IGBT has a first region of a first conductivity type, a second region of a second conductivity type formed on the first region, a third region of the first conductivity type formed on the second region, and a fourth region of the second conductivity type contacting the third region and forming a P-N junction therewith. The first and third regions contact a first and second electrode region. A first field effect transistor controls conduction between the fourth and the second region in response to an actuation bias; and a second field effect transistor means between the fourth region and the second electrode region for turning the thyristor off, in response to a cutoff bias. The IGBT withstands high voltage and lower forward voltage drop simultaneously.

Inventors: Liaw; Chorng-Wei (Huwei Jen, Taiwan); Lin; Ming-Jang (Taiping Shiang, Taiwan); Shiue; Tian-Fure (Judung Jen, Taiwan); Cheng; Huang-Chung; Hsu; Ching-Hsiang (Hsinchu, Taiwan); Lin; Wei-Jye (Chaujou Jen, Taiwan); Tien; Hau-Luen (Taipei, Taiwan)

Assignee: Analog and Power Electronics Corp. (Hsinchu, Taiwan)

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