Novel zero-voltage-switching family of isolated converters

Claim 1

An isolated, resonant, zero-voltage-switching converter, comprising in combination: a transformer having a primary winding and a secondary winding, said transformer having a magnetizing inductance; a direct current voltage source; primary switching means including a primary parasitic switch capacitance for periodically coupling said voltage source to said primary winding: a resonant circuit including said primary switch capacitance and said magnetizing inductance for establishing a zero voltage across said primary switching means immediately prior to turn-on of said primary switching means; a load impedance; means coupling said secondary winding of said transformer to said load impedance; said means coupling said secondary winding, including an LC filter, and a unidirectional switch that periodically blocks current flow in said secondary winding when a zero impedance condition exists across said primary winding.