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.”

UPS provides electric power to a critical load

6,255,743
July 3, 2001

The uninterruptible power supply (UPS) system supplies electric power to computers, medical apparatus, and other critical loads when a primary power supply fails. The UPS system includes an electrical machine connected to a turbine rotated by a motive fluid from a fluid supply. The machine can be dual purpose (motor/generator) or a two-unit machine with one motor and one generator in a single or separate housing. It acts as a motor to rotate the turbine, and energy is stored by the turbine rotor in the form of rotational momentum. When the primary power supply fails, the rotational momentum acts as a generator to provide power to the critical load. In the event of extended power loss or failure, combustion products, steam, compressed gases or other motive fluids drive the turbine motor.

Inventors: Pinkerton; Joseph F. (Austin, Texas); Clifton; David B. (Leander, Texas) Assignee: Active Power, Inc. (Austin, Texas)

Switching circuit

6,252,451
June 26, 2001

This one-way switching circuit includes a gate turnoff thyristor biased to be normally on with a capacitor and a controllable switch connected in parallel between the gate and supply line.

Inventors: Guitton; Fabrice (Tours, France); Magnon; Didier (Saint Georges les Baillargeaux, France); Simonnet; Jean-Michel (Veretz, France); Ladiray; Olivier (Montlouis sur Loire, France) Assignee: STMicroelectronics S.A. (Gentilly, France)

Planar magnetic component

6,252,487
June 26, 2001

The high-leakage planar magnetic component has a structure where flat winding turns are oriented transverse to the plane of the winding structure. It exhibits significantly lower winding losses than components with a stacked arrangement of flat winding turns parallel to the plane of the winding structure. A dense winding structure with a transverse orientation can readily be made by forming a flat conductor into a coil using conventional wire winding techniques.

Inventors: Wolf; Ronald M. (Katonah, N.Y.); Azevedo; Jose (Mahopac, N.Y.) Assignee: Philips Electronics North America Corporation (N.Y.)

Active reset forward converter

6,252,781
June 26, 2001

This converter comprises a first switch for connecting an input dc voltage to a primary winding of a transformer and a second switch for connecting a reset voltage to the transformer. The first and second synchronous rectifiers within a filter circuit receive an output voltage waveform from a secondary winding of the transformer and generate there from a dc output voltage. The synchronous rectifiers are controlled by the secondary winding. The first synchronous rectifier couples the secondary winding to an output terminal of the power supply to provide output power during part of the switching cycle. The second synchronous rectifier serves as a “flywheel” for providing load current during a second part of the switching cycle when the first synchronous rectifier is off. The timing of the first and second switches is arranged to prevent simultaneous conduction of the synchronous rectifiers.

Inventors: Rinne; Karl (Waterford, Ill.); Duigan; Joseph (Cork, Ill.); Keane; Frank (Waterford, Ill.) Assignee: Artesyn Technologies, Inc. (Eden Prairie, Minn.)

ARCP multi-point converter

6,278,626
August 21, 2001

The ARCP converter has a series circuit formed of four main switches per converter phase — connected electrically in parallel between dc voltage rails. A capacitance is connected in parallel with each individual main switch. Two intermediate-circuit capacitances are disposed between the dc voltage rails. A voltage neutral point of the capacitances is available for tapping. Junction points of adjacent main switches not forming the output are connected to one another via variable-potential intermediate-circuit capacitances for forming commutation cells in a balanced manner. Each intermediate-circuit capacitance is formed of two capacitance elements, with the output of the converter phase connected to a resonant inductance. Further connection to all the voltage neutral points is via a controllable bidirectional auxiliary switch.

Inventors: Teichmann; Ralph (Dresden, Germany) Assignee: ABB Patent GmbH (Mannheim, Germany)

Digital communications on a power line

6,278,357
August 21, 2001

This apparatus establishes bidirectional digital communication over a power line network. It includes a signal launching circuit imposing a digital communication signal onto a power signal carried by a power line network. This forms a digital communication power signal at a first point in the power line network. The circuit is configured to position a pulse of the digital communication signal at any phase location of each half cycle of the power signal. A receiver reads the digital communication power signal at a second point in the power line network. A signal processor is connected to the receiver to recover the digital communication signal from the digital communication power signal.

Inventors: Croushore; Timothy M.; Guyker; William C. (Greensburg, Pa.); Curt; Walter M.; Shomo, III; Glen K.; Mullins; Chris F. (Harrisburg, Va.); Childers, IV; James M. (Yorktown, Va.) Assignee: Electric Power Research Institute, Inc. (Palo Alto, Calif.)

Buck-boost function type electronic ballast

6,278,245
August 21, 2001

An electronic ballast for a high intensity discharge lamp combines the functions of a boost and buck converter and line voltage rectification with the load commutation. This configuration requires one controller, and the control signal for the controller is taken off a resistor in series with the bus capacitor. The lamp power is indirectly controlled by regulating the input buck current to the buck converter portion.

Inventors: Li; Faye (Flushing, NY); Shen; Eric B. (Scarborough, N.Y.) Assignee: Philips Electronics North America Corporation (New York)

Motor drive circuit

6,275,405
August 14, 2001

This phase converter is for converting single-phase power to 3-phase power. The single-phase power is provided at a first and a second single-phase power terminal and the 3-phase power is provided to a first, a second and a third 3-phase power terminal. The phase converter is comprised of first and second power transfer means for coupling the first and second single-phase power terminals to the first and second 3-phase power terminals and an inverter coupled to receive power from the first and second single-phase power terminals. It provides power to the third 3-phase power terminal and a neutral output by phase shifting its input power by 90°.

Inventor: Pernyeszi; Joseph (Scotts Valley, Calif.) Assignee: General Electronics Applications, Inc. (Scotts Valley, Calif.)

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