Zero voltage switching DC/DC converter

Details Zero voltage switching DC/DC converter Zero voltage switching DC/DC converter

1991-02-19

1992-08-18

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363133, H02M 3337

Patent

active

051405121

ABSTRACT:
A zero voltage switching DC/DC converter comprises a transformer with two opposed primary windings between which is a center tap and at least one secondary winding connected to a load by a rectifier and capacitor filter circuit. A first terminal of a constant voltage supply is connected to the center tap of the transformer. Two switching units are each connected in series between the second terminal of the voltage supply and a respective primary winding. The switches connect the second terminal of the voltage supply alternately and periodically to one or the other of the primary windings. A control device imposes between opening of one switch and subsequent closing of the other switch a switching time during which both switches are open. A device for automatically adjusting the switching time includes a detector adapted to compare the voltage of each primary winding with a reference voltage and an inhibiting device adapted to prevent, after opening of one switch, closing of the other switch until the voltage of the primary winding which corresponds to the latter switch falls below a predetermined threshold.

REFERENCES:
patent: 4443840 (1982-09-01), Geissler et al.
patent: 4484256 (1982-04-01), Hartman
patent: 4931716 (1990-06-01), Jovanovic et al.
patent: 4959765 (1990-09-01), Weinberg

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