Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1988-08-01
1989-08-01
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 71, 363 98, H02M 3337
Patent
active
048538329
ABSTRACT:
A converter for converting a low voltage direct current power source to a higher voltage, high frequency alternating current output for use in an electrical system where it is desired to use low weight cables and other circuit elements. The converter has a first stage series resonant (Schwarz) converter which converts the direct current power source to an alternating current by means of switching elements that are operated by a variable frequency voltage regulator, a transformer to step up the voltage of the alternating current, and a rectifier bridge to convert the alternating current to a direct current first stage output. The converter further has a second stage series resonant (Schwarz) converter which is connected in series to the first stage converter to receive its direct current output and convert it to a second stage high frequency alternating current output by means of switching elements that are operated by a fixed frequency oscillator. The voltage of the second stage output is controlled at a relatively constant value by controlling the first stage output voltage, which is accomplished by controlling the frequency of the first stage variable frequency voltage controller in response to second stage voltage. Fault tolerance in the event of a load short circuit is provided by making the operation of the first stage variable frequency voltage controller responsive to first and second stage current limiting devices. The second stage output is connected to a rectifier bridge whose output is connected to the input of the second stage to provide good regulation of output voltage wave form at low system loads.
REFERENCES:
patent: 3487289 (1969-12-01), McMurray
patent: 3893015 (1975-07-01), Weil
patent: 3953779 (1976-04-01), Schwarz
patent: 4034280 (1977-07-01), Cronin et al.
patent: 4150423 (1979-04-01), Boschert
patent: 4460949 (1984-06-01), Steigerwald
patent: 4504895 (1985-03-01), Steigerwald
patent: 4641232 (1987-02-01), Pitel
patent: 4706177 (1987-11-01), Josephson
patent: 4757432 (1988-07-01), Hancock
"A Study of Schwarz Converters For Nuclear Powered Spacecraft"by Thomas A. Stuart and Gene E. Schwarze.
"A Cascaded Schwarz Converter For High Frequency Power Distribution" by Biswajit Ray and Thomas A. Stuart. A Paper Presented at the 1988 Power Electronics Specialists Conference, (1988).
Barker, Jr. Vincent L.
Beha Jr. William H.
Meehan Thomas A.
University of Toledo
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