Switch current sensing with snubber current suppression in a push-pull converter
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United States of America Patent
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-
Sep 17, 1985
Grant Date -
N/A
app pub date -
Nov 2, 1983
filing date -
Nov 2, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A push-pull converter has transistor power switches which conduct alternately to connect 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 transformer with an output winding inductively coupled with each of the conductors connected between the power switches and the primary windings of the output transformer. The snubber current pulses through the conductors are 180.degree. out of phase and are suppressed 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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