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Abstract

An full bridge Zero-Voltage-Switched DC/DC converter with the four MOSFET snitches feeding the primary winding (T1) of the output transformer (T1) through a series inductance (L) and a series DC blocking capacitance (C) uses two MOSFET asynchronous rectifiers ((Q2) in its full wave output section. Each ((Q2) is serially connected between the output transformer (T1) and the output shunt capacitance (C') through the primary winding (T21) of a transformer detecting its drain current. The secondary winding (T22) of the detector transformer is shunted by a pair of resistances (R1/R'1) each in series with the base-emitter junction of a bipolar transistor (Q1/Q'1), the two transistors of complementary polarity forming a totem-pole branched across an auxiliary winding (T12) of the output transformer. The totem-pole output coupled (R2) to the gate of the MOSFET (Q2) switches its state upon the drain current value crossing the adjustable (R1/R'1) low value of the detector transformer magnetising current.

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First Claim