Switch current sensing with snubber current suppression in a push-pull converter

In a push-pull converter having a DC source, an output transformer with primary windings, a pair of power switches which conduct alternately to connect the power source with the primary windings of the output transformer and a turn-off snubber circuit connected with each of said power switches, the snubber circuits causing a snubber current to flow in both primary windings at a turn-on of each of said switches, each switch being connected by a conductor with an output transformer primary winding, a switch current sensing circuit comprising:

• a current transformer having an output winding inductively coupled with each of said conductors which connect the switches and the primary windings of the output transformer, the conductors being physically arranged so that the switch currents through the conductors are 180.degree. out of phase, suppressing the snubber current pulses in the switch current signal developed in the output winding of the current transformer.