Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1983-04-27
1986-08-26
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 80, 363 97, H02M 3335
Patent
active
046086250
ABSTRACT:
A current driven flyback power supply has a transistor current switch which periodically couples a primary current through the primary winding of a power transformer which is connected between a source of DC and the collector of the current switch. A current transformer has a first winding coupled between the primary winding and the collector of the current switch, and a second winding which develops a drive current proportional to the primary current. The drive current is coupled to the base of the current switch and increases proportionally with the increasing amplitude of the primary current. An electrical switch shorts the drive current to ground to turn off the current switch so that stored energy in the power transformer is coupled out through its secondary winding to an output rectifier circuit which develops the output DC voltage. After the stored energy has been completely coupled out through the secondary winding, a first current pulse is developed to turn on the current switch to initiate the primary current. During high output power loading conditions, a second current pulse is developed at a selected point in time after the current switch turns off and prior to the stored energy being completely coupled out through the secondary winding. The second current pulse turns on the current switch whereby the initial primary current is boosted in amplitude by the residual stored energy in the power transformer.
REFERENCES:
patent: 4092709 (1978-05-01), Voigt et al.
patent: 4135234 (1979-01-01), Forge
patent: 4321507 (1982-03-01), Bosnak
patent: 4323961 (1982-04-01), Josephson
patent: 4347559 (1982-08-01), Sturgeon
patent: 4361865 (1982-11-01), Shono
patent: 4378585 (1983-03-01), Bete
patent: 4453206 (1984-06-01), Voight
"Flyback Converters With Current Transformer Drive", J. R. Kinghorn; Mullard Technical Communications; vol. 13, pp. 210-224, No. 125, Jan. 1975.
Flyback Converters: "Solid State Solution To Low Cost Switching Power Supplies"; Electronics, Dec. 21, 1978; Boschert.
Josephson Elliot
Parker Frederick S.
Astec Components, Ltd.
Beha Jr. William H.
Sterrett Jeffrey
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