Drive circuit for power switches of a zero-voltage switching pow

Details Drive circuit for power switches of a zero-voltage switching pow Drive circuit for power switches of a zero-voltage switching pow

1992-04-20

1993-12-07

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

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

363 98, H02M 3335

Patent

active

052688305

ABSTRACT:
A drive arrangement and operative scheme for the power switching transistors of a half-bridge power drives the two power switching transistors with unequal duty cycles having conducting durations such that the sum of the conduction intervals substantially equals the combined switching period of the two power switching transistors. The conducting intervals are separated by very short dead time intervals controlled by the differing turn-on and turn-off times of the two power switching transistors. The short interval between alternate conductions of the two power switching transistors is sufficient to allow zero voltage turn on of the power switching transistors but short enough to minimize power loss and conducted noise.
Special biasing is provided to prevent drive signal application to power switches prior to attainment of a minimum voltage across the switch.
Circuitry is provided for cancellation of output ripple currents at selected operating points of the power converter.

REFERENCES:
patent: 4814962 (1989-03-01), Magalhaes
patent: 5177675 (1993-01-01), Archer
"Twelfth International Telecommunications Energy Conference", Intellec '90, Oct. 21-25, 1990, p. i-185.

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