Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1987-01-30
1988-06-28
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, H02M 3335
Patent
active
047543850
ABSTRACT:
Disclosed is a dual transistor flyback converter having a pair of synchronously driven switching transistors (20, 36) for switching voltage to a primary (12) of a flyback transformer (10). When driven into a cutoff state, transistor (36) isolates switching transistor (20) from the supply voltage (V1), thereby preventing a transformer reflected voltage from being superimposed on the supply voltage and imposing such voltage across the transistor (20). Clamp diodes (40, 42) maintain the switching transient voltage across the flyback transformer primary (12) between prescribed limits. Capacitor (48) allows the switching transient to pass and be clamped by the diodes (40, 42), but prevents the reflected secondary voltage from being clamped when the input voltage is low. A current sensing circuit (50) in series with the flyback transformer secondary (14) senses current flow during the power conversion cycle, and provides a digital indication to a PWM control circuit (66) to facilitate reliable discontinuous operation of the flyback converter.
REFERENCES:
patent: 4370701 (1983-01-01), Western
patent: 4585986 (1986-04-01), Dyer
Krumrein, "DC Converter", IBM Technical Disclosure Bulletin, vol. 17, No. 7, Dec. 1974, p. 1978.
Patel et al., "150 Watt Flyback Regulator", Unitrode Switching Regulated Power Supply Design Seminar Manual, 1986.
Mahmoudi Mathew
McDade Don
Tompkins Birnam R.
Chauza Roger N.
Mills Jerry W.
Varo Inc.
Wong Peter S.
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