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.”

IPM with integral output current shunt

6,262,902
July 17, 2001

This intelligent power module (IPM) is formed of an inverter having power elements, a predriver for driving the inverter, and a protect circuit — all integrated into the same package. A shunt resistor is provided at an output of the inverter so an end-to-end voltage of the shunt resistor can be output to an external device. This configuration enables an output current from an inverter apparatus incorporating the IPM to be detected without using a current transformer. In addition, the module terminals of the IPM and the terminal blocks of the inverter apparatus are integrated together to eliminate the need for wire rods and set screws connecting the module terminals and the terminal blocks together.

Inventors: Watanabe; Manabu; Oda; Yoshinori (Nagano, Japan) Assignee: Fuji Electric Co., (Kawasaki, Japan)

Capacitor for intermediate-circuit assemblies

6,262,876
July 17, 2001

A contact sleeve passing through a central region of a capacitor provides a low-inductance connection between a lower contact surface of a capacitor and a first outer port. The sleeve is separated from the capacitor windings by an insulative layer. A second outer port is formed in close proximity to and insulated from the first outer port so that arcing between the outer ports is prevented. The resulting capacitor has a low inductance and is useful in the intermediate circuit design of converters, resulting in a compact and reliable configuration.

Inventors: Schimanek; Ernst (Nurnberg, Germany) Assignee: Semikron Elektronik GmbH (Germany)

Secondary-side controlled resonant AC VRM

6,262,905
July 17, 2001

A secondary-side controlled series resonant ac voltage controlled module (VRM) converts an ac distribution bus voltage to a low dc voltage for providing power to high speed microprocessors and integrated circuits. Done with minimal conduction and switching losses, it provides high efficiency even at low output voltage, high current and high switching frequency.

Inventors: Zhang; Richard S. (Clifton Park, N.Y.); Steigerwald; Robert Louis (Burnt Hills, N.Y.) Assignee: General Electric Company (Schenectady, N.Y.)

Power chip set for switching mode power supply

6,259,618
July 10, 2001

The power chip set for a switching mode power supply includes a high-voltage chip and a control unit chip. The high-voltage chip contains a switching power metal-oxide-semiconductor (MOS) transistor being turned on/off under control of an output signal from the control unit, and a junction field effect transistor (JFET) coupled between a drain of the switching power MOS transistor and a power terminal of the control unit. This drives the control unit during initiation, in which the JFET has a negative threshold voltage and the absolute value is equal to the voltage for driving the control unit. The JFET structure includes a Zener diode for overvoltage protection of the control unit. The chip set can be packaged into a power module.

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

Network implements a power amplifier

6,259,335
July 10, 2001

This umbrella-shaped matching network for matching phase and impedance in a power amplifier employs rounded corners. Because they are less prone to signal radiation than square corner power combining networks, the rounded corners reduce microwave signal scattering losses. The matching network includes slits defining separated arms, which are positioned to provide phase and amplitude balance for the signal presented to the amplifiers. The slits also prevent current from traveling transversely.

Inventors: Ingram; Daisy L. (Cerritos, Calif.); Yen; Huan-Chun (Torrance, Calif.); Chen; Yaochung (Rancho Palos Verdes, Calif.) Assignee: TRW Inc. (Redondo Beach, Calif.)

AC to DC conversion arrangement

6,256,209
July 3, 2001

An inverter circuit and a boost power factor correction stage comprise this arrangement for converting an ac supply to a dc supply. The inverter circuit is made of switchable components and utilizes a pulsed waveform indicative of power factor correction for causing some of the components repeatedly to adopt a condition permitting the boost power factor correction stage to draw current from the ac supply.

Inventors: Gurwicz; David (Gateshead Tyne & Wear, Great Britain); Thompson; Kevin (Southshields, Great Britain) Assignee: Nada Electronics Limited (Great Britain)

Hybrid low voltage swing sense amplifier

6,255,861
July 3, 2001

A sense amplifier includes a pair of output terminals, an evaluation circuit, a reference circuit and a pair of clamping circuits. The evaluation circuit connects a first output terminal to an evaluation potential and receives a data signal at an input terminal. The reference circuit connects a second output terminal to the evaluation potential and receives a pair of reference signals on other input terminals. Each clamping circuit couples a respective one of the output terminals to a precharge potential. Inputs of each clamping circuit are coupled to the other of the output terminals.

Inventors: Zhang; Kevin X. (Portland, Ore.) Assignee: Intel Corporation (Santa Clara, Calif.)

Buck and boost power converters

6,252,383
June 26, 2001

This dc to dc converter circuit has non-pulsating input and output currents using a single simple coupled inductor. The dc to dc converter works with buck or boost conversion using a simple circuit requiring two switches one of which may be a simple diode rectifier, a capacitor and two inductors. These may be colocated on a single common magnetic core. Zero voltage switching versions of these converters are available. The buck circuit accomplishes dc to dc conversion without inversion and with no right half plane zero in its control to output transfer function. The boost version is also non-inverting.

Inventors: Wittenbreder; Ernest H. (Flagstaff, Ariz.) Assignee: Technical Witts, Inc. (Flagstaff, Ariz)

Active clamp for power converter

6,259,235
July 10, 2001

This active clamp is for use with a power converter couplable to a source of electrical energy. The converter's power switch intermittently conducts intermittenly to transfer energy from the source to an inductive element, and a freewheeling diode alternately conducts with the power switch to transfer energy to an output of the converter, an active clamp, and a method of operating the active clamp. The active clamp is coupled in series with the freewheeling diode, and a series-coupled capacitor and clamping switch, coupled in parallel with the inductor. This cooperation mitigates the adverse effects of reverse recovery currents associated with the freewheeling diode and enables substantially zero voltage switching of the power and clamping switches.

Inventors: Fraidlin; Simon (Plano, Texas); Polikarpov; Anatoliy (Mesquite, Texas) Assignee: Tyco Electronics Logistics AG (Steinach/SG, Switzerland)

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