Transistor protection circuit

Details Transistor protection circuit Transistor protection circuit

1980-06-26

1981-11-24

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

330207P, 330298, 361 56, 361 90, 361 91, H02H 324

Patent

active

043027920

ABSTRACT:
A circuit is described for protecting a semiconductor junction device such as a transistor against damage from high voltage transients that can be produced by kinescope arcing in a television receiver. The protected device is coupled to a circuit point at which the transients can appear. The protection circuit comprises a normally nonconductive protection transistor with a collector coupled to a source of operating potential, a base coupled to a source of threshold conduction bias reference voltage, and an emitter connected to the circuit point at which high voltage transients are likely to appear. The base bias of the protection transistor is determinable independent of the bias of the protected device, and the protection circuit is connected to the protected device with substantially zero voltage offset between the circuit point and the protected device. The protection transistor conducts in response to transient voltages appearing at the circuit point above a threshold level, and provides a path for safely diverting potentially destructive transient current away from the protected device.

REFERENCES:
patent: 3819952 (1974-06-01), Enomoto et al.
patent: 4106048 (1978-08-01), Khatezadeh
patent: 4133000 (1979-01-01), Greenstein

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