Method for controlling push-pull series-resonant converter switc

Details Method for controlling push-pull series-resonant converter switc Method for controlling push-pull series-resonant converter switc

1990-10-12

1991-10-01

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

363 17, 363 80, 363 97, H02M 3337

Patent

active

050539370

ABSTRACT:
A push-pull series resonant converter switching power supply includes an inductive transformer with a primary winding and at least one secondary winding. Two semiconductor switches are interconnected at a circuit node and connected in a half-bridge circuit between an input potential and an input ground potential. A series-resonant circuit connected between the connecting node and the input ground potential includes a capacitor and an inductor connected in series with the primary winding of the transformer. Diodes are connected between the input potential and the input ground potential for preventing a potential at the capacitor from significantly exceeding the input potential. An output is connected to the secondary winding of the transformer for supplying an output voltage. A control circuit triggers the two semiconductor switches with turn-on pulses for regulating the output voltage to a constant value as a function of a load to be connected to the output by variation of a turn-on pulse repetition rate. A method for controlling the push-pull series resonant converter switching power supply includes controlling a maximum allowable repetition rate of the turn-on pulses and the duration of the turn-on pulses as a function of the input potential.

REFERENCES:
patent: 4353112 (1982-10-01), Rietveld
patent: 4692851 (1987-09-01), Attwood
patent: 4896255 (1990-01-01), Schlenk et al.
patent: 4933605 (1990-06-01), Quazi et al.

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