Gated snubber circuit

Details Gated snubber circuit Gated snubber circuit

1980-01-25

1982-06-08

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

363133, 363138, H02H 7122

Patent

active

043342540

ABSTRACT:
A voltage snubber connected to the output terminals of a transistorized, push-pull inverter for supplying bidirectional current to an inductive load comprises a snubber capacitor and relatively large valued resistor connected in series with each other across the output terminals of the inverter and a switching circuit for bypassing the resistor during turn-off periods of the inverter transistors. The value of the snubber resistor is high enough to provide slow recharging of the snubber capacitor during turn-on periods of the inverter transistors to reduce transistor power dissipation. When the resistor is bypassed by the switching circuit during the inverter transistor turn-off periods, the snubber is gated on to suppress high voltage surges generated by the inductive load. The snubber switching circuit is responsive to current sensors or logic commands connected in circuit with the inverter to detect turn-off transistors of the inverter transistors. In one embodiment, the switching circuit comprises an NPN transistor and a PNP transistor both connected in shunt with the snubber resistor and turned on in response, respectively, to turn-off currents in the positive and negative legs of the push-pull inverter. In a second embodiment, the secondary winding of a transformer is connected in shunt with the snubber resistor. The primary winding is short-circuited by a pair of NPN transistors in response to turn-off current in either inverter leg to electrically bypass the snubber resistor.

REFERENCES:
patent: 3257604 (1966-06-01), Colclaser
patent: 3418495 (1968-12-01), Bose
patent: 3571614 (1971-03-01), Rolstead
patent: 3641407 (1972-02-01), Scott
patent: 4015185 (1977-03-01), Pollmeier
Kuecken, "Solid State Motor Controls", Tab Books, Jun. 1978, pp. 43-45.

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