Capacitor coupled current mode balance circuit

Details Capacitor coupled current mode balance circuit Capacitor coupled current mode balance circuit

1984-05-25

1986-12-23

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 98, 363132, H02M 3335

Patent

active

046316531

ABSTRACT:
A control circuit is provided for controlling the on-time of a pair of switching transistors in a half bridge converter. The control circuit includes a first comparator for comparing the converter output voltage with a reference voltage. The control circuit also includes a circuit which generates a first signal indicative of the current through the primary winding of the converter output transformer. Also included is a circuit which generates a second signal indicative of the on-time of one of the switching transistors exceeding the on-time of the other switching transistor. The first and second signals are averaged and compared with the output voltage of the first comparator by a second comparator. The second comparator controls the on-time of the switching transistors. In this way, any imbalance in the on-time of the switching transistors is corrected by the control circuit.

REFERENCES:
patent: 3859583 (1975-01-01), Reed
patent: 3859586 (1975-01-01), Wadlington
patent: 3870943 (1975-03-01), Weichedel et al.
patent: 4002963 (1977-01-01), Hunter
patent: 4233658 (1980-11-01), Lupatin et al.
patent: 4351020 (1982-09-01), Leti et al.
patent: 4404623 (1983-09-01), Jourdan
patent: 4429359 (1984-01-01), Anderson
patent: 4477867 (1984-10-01), Pellegrino
Chryssis, George "High-Frequency Switching Power Supplies", pp. 28-31, McGraw-Hill, 1984.

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