Zero-voltage switching circuitry, as for use in resonant inverte

Details Zero-voltage switching circuitry, as for use in resonant inverte Zero-voltage switching circuitry, as for use in resonant inverte

1995-12-14

1997-06-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327141, H03L 700

Patent

active

056420650

ABSTRACT:
Switching loss in push-pull switching transistors in a resonant inverter or the like, is minimized by assuring the switching of each of the transistors into conduction occurs when the voltage across its principal conduction path is zero-valued, or substantially so. This is done responsive to sensing the flow of forward currents through clamp diodes connected across the principal conduction paths of each of the transistors. This sensing is done so as to avoid the need for an additional coupling transformer. More particularly, the current flow to or from either of the terminals of the primary direct voltage supply, which current flow is in a first direction when either of the switching transistors is conductive and is in a second direction opposite to the first direction when the clamp diodes are conductive, is sensed for determining the times when the switching transistors are to begin to be conditioned for conduction. The switching transistors begin to be conditioned for conduction when the current flow is in the second direction.

REFERENCES:
patent: 5397878 (1995-03-01), Chen

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