Switch current sensing with snubber current suppression in a...

Details Switch current sensing with snubber current suppression in a... Switch current sensing with snubber current suppression in a...

H - Electricity

02

H

321/29, 321/55

H02H 7/20 (2006.01) H02H 7/122 (2006.01) H02M 3/337 (2006.01) H02M 7/217 (2006.01)

Patent

CA 1220514

Switch Current Sensing With Snubber Current Suppression in a Push-Pull Converter Abstract A push-pull converter has transistor power switches which conduct alternately to con- nect a DC source with the primary windings of an output transformer. A turn-off snubber circuit is connected with each power switch. When a power switch is turned on, snubber current pulses flow in the circuits connected with both switches. A switch current sensor circuit has a current trans- former with an output winding inductively coupled with each of the conductors connected between the power switches and the primary windings of the out- put transformer. The snubber current pulses through the conductors are 180° out of phase and are sup- pressed in the current transformer output. The switch current signal from the secondary of the current transformer is free of snubber current pulses and is used in a flux balance circuit and in a pulse-by-pulse current limiter.

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