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.”

Method and a circuit for resonance inversion

May 22, 2001

This resonance inverter is comprised of a resonance circuit with one inductance and one capacitor, and a switch circuit electrically connected to the resonance circuit comprising a power electronic component. It also features a circuit for controlling each power electronic component in accordance with a given control algorithm or strategy, the control circuit being electrically connected to the switch circuit. A unique feature comprises a pulse generating circuit (12 ft; 15; 32 ft, 31) having at least one control inductance (12 ft, 32 ft) which is coupled to at least one of the inductances of the resonance circuit, transferring energy inductively to the resonance circuit.

Inventors: Munk-Nielsen; Stig (Aalborg, Germany) Assignee: APC Danmark A/S (Kolding, Germany)

Segmented heat sink

May 22, 2001

A heat exchanger dissipates heat from a heat generating component. This comprises a thermally conductive base, and a plurality of plate fins affixed to the base defining a fin field and channels. The individual fins of the heat exchanger comprise a plurality of vertical segments extending from the base to the top area of the heat exchanger. The vertical segments are spaced apart by apertures. The horizontal width of the segments may vary to adjust the fluid flow through the heat exchanger. The fluid control feature for substantially preventing premature egress of fluid from a top region of the fin field caused by the high pressure region within the field.

Inventor: Azar; Kaveh (Westwood, Mass.)

High-speed disconnector

May 8, 2001

The high-speed disconnector comprises a transformer whose primary is connected into the ac power supply system. A rectifier circuit is provided on the secondary side with a connected turn-off thyristor. In normal operation, the turn-off thyristor is kept closed, so the power supply system supplies the load. In the event of power supply system faults or interruptions, the turn-off thyristor is opened, which disconnects the supply system from the load owing to the transformer impedance.

Inventors: Dahler; Peter (Remigen, Switzerland); Gruning; Horst (Wettingen, Switzerland)

Assignee: Asea Brown Boveri AG (Baden, Switzerland)

Multiple inverter system

May 8, 2001

This multiple inverter system includes a plurality of input transformers having secondary windings and a plurality of unit inverter cells connected in series at n stages. The system composes respective phases and supplies the electric power to a multiple-phase load in combination with the input transformers. The input transformers have 3n sets of three-phase windings at the secondary side and the secondary windings of the transformers. It includes a bypass switch control to melt a fuse that's applicable to a unit inverter given with a circuit closing command to a bypass switch corresponding to applicable unit inverters in response to operation and DC abnormality detectors.

Inventors: Ichikawa; Kosaku; (Tokyo) Hirata; Akio; (Tokyo) Kawakami; Kazuto; (Tokyo) Satoh; Kazuhiro (Tokyo) Assignee: Kabushiki Kaisha Toshiba (Kawasaki, Japan)

Step-up continuous mode DC-to-DC converter

May 1, 2001

This step-up continuous-mode DC-to-DC converter with integrated current control compares a voltage signal output from the converter and a reference signal for generating an error signal. It generates a ramp signal which is added to a signal proportional to a current ramp flowing across the converter. The signal output from the comparator and the signal obtained from the sum are sent to an additional comparator. The output, combined with an oscillator signal, drives a power transistor of the converter. A fuzzy logic control unit is interposed between the comparator and the additional comparator. The fuzzy logic control unit receives the comparator's error signal output and emits an output signal, which depends on the variation of the error signal.

Inventors: Criscione; Marcello (Ragusa, Italy); Occhipinti; Luigi (Ragusa, Italy)

Assignee: STMicroelectronics S.r.l. (Agrate Brianza, Italy)

Power converter

April 24, 2001

This power converter delivers and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.

Inventors: Schlecht; Martin F. (Lexington, Mass.) Assignee: SynQor, Inc. (Hudson, Mass.)

Cooling a planar inductor

April 24, 2001

This device cools a planar inductance coil, in particular a planar transformer, on a plate-shaped support with a plurality of conducting layers. One conducting layer of the support, in co-operation with a core element, guides a magnetic flux and provides the planar inductance coil. The core element is connected to a side by means of a heat-conducting adhesive, and on a second planar outside surface it's glued to a cooling element having a planar contact surface.

Inventors: Gammenthaler; Peter (Hittnau, Switzerland) Assignee: Melcher A.G. (Uster, Switzerland)

Power switching device mounting assembly

April 17, 2001

The power electronics chassis and liquid-cooled heat sink mounting assembly for electric vehicles and other applications use liquid coolant to cool power electronic devices contained within an electrically conductive housing. The chassis includes an inverter containing heat sunk power switching devices using the liquid-cooled mounting assembly. The power switching devices are attached to a mounting surface of the heat exchanger and are thermally coupled to the coolant within the heat exchanger via the mounting surface. The inlet and outlet of the plastic coolant manifold are connected to the heat exchanger by conduits. This configuration reduces the radiated EMI by reducing the parasitic capacitance between the switching devices and chassis housing.

Inventors: Nagashima; James (Cerritos, Calif.); Ward; Terence G. (Redondo Beach, Calif.); Downer; Scott D. (Torrance, Calif.) Assignee: General Motors Corp. (Detroit)

Self-commutated power converter

April 17, 2001

These high-power self-commutated power converter modules are joined phasewise to a phase heat sink. They can be joined, one over another, to a partition so their cooling fins protrude through the partition openings into a ventilation space. Each runs horizontally, an air-discharge duct being arranged in the ventilation space. The air-discharge duct allows the cooling air of the ventilation space to flow laterally on both sides of the phase heat sinks, between the cooling fins into the air-discharge duct. This produces a self-commutated power converter whose size, weight and cost are reduced compared to a power converter having a conventional design, and whose high-power modules are each fully utilized in terms of capacity.

Inventors: Pfauser; Anton (Pommersfelden, Germany) Assignee: Siemens Aktiengesellschaft (Munich, Germany)

Power converter with voltage-dependent modes

April 10, 2001

The power converter with voltage-dependent switchable modes is used with power converters having an input, first and second capacitors and first and second switches. This mode selection circuit may function in two modes of operation. In a first mode, the mode selection circuit is adapted to couple the first and second capacitors and the first and second switches together as a half-bridge converter. In a second mode, the mode selection circuit is adapted to couple the first switch and the first capacitor together as a forward-flyback converter and to further couple the second capacitor and the second switch as a clamp thereto. In another embodiment, the first mode is a high voltage mode, and the second mode is a low voltage mode, in response to a low input voltage.

Inventors: Mao; Hengchun (Plano, Texas) Assignee: Lucent Technologies Inc. (Murray Hill, N.J.)

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