Switch current sensing with snubber current suppression in a pus

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

1983-11-02

1985-09-17

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361100, 363 55, 363 56, 363 41, 363 26, 363 24, H02H 712

Patent

active

045424403

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.

REFERENCES:
patent: 3341765 (1967-09-01), Rogers et al.
patent: 3913000 (1975-10-01), Cardwell, Jr.
patent: 4002963 (1977-01-01), Hunter
patent: 4245288 (1981-01-01), McLyman
patent: 4352153 (1982-09-01), Voyer
patent: 4410935 (1983-10-01), Dang

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