Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By induction-type converter
Reexamination Certificate
1999-12-09
2001-08-14
Patel, Rajnikant B. (Department: 2838)
Electric power conversion systems
Phase conversion without intermediate conversion to d.c.
By induction-type converter
C363S150000, C318S768000
Reexamination Certificate
active
06275405
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to phase conversion, and more particularly, to an improved phase converter for converting single-phase power to three-phase power.
BACKGROUND OF THE INVENTION
Conventional techniques of generating 120-degree phase difference require expensive, complicated and less reliable controllers using microprocessors and associated electronics.
SUMMARY OF THE INVENTION
An improved phase converter for converting single-phase power to three-phase power is provided by one embodiment of the present invention. Single-phase power is provided at a first and a second single-phase power terminal and the three-phase power is provided to a first, a second and a third three-phase power terminal, the phase converter comprising: a first power transfer means for coupling the first single-phase power terminal to the first three-phase power terminal; a second power transfer means for coupling the second single-phase power terminal to the second three-phase power terminal; and an inverter coupled to receive power from the first and second single-phase power terminals. The inverter provides power to the third three-phase power terminal and a neutral output by phase shifting its input power by ninety degrees.
REFERENCES:
patent: 3670238 (1972-06-01), Ronk
patent: 3991354 (1976-11-01), Rosa et al.
patent: 4079446 (1978-03-01), Hertz
patent: 4706174 (1987-11-01), Schutten et al.
patent: 4777421 (1988-10-01), West
patent: 5235504 (1993-08-01), Sood
General Electronics Applications, Inc.
Patel Rajnikant B.
Townsend and Townsend / and Crew LLP
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