Latch-up prevention circuit for power output devices using induc

Details Latch-up prevention circuit for power output devices using induc Latch-up prevention circuit for power output devices using induc

1980-02-28

1982-03-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361111, 330207P, 307303, H02H 904

Patent

active

043227708

ABSTRACT:
A circuit arrangement is provided which prevents latching in a power amplifier or supply. A power output transistor drives an inductive load, which is coupled in parallel with the collector-to-emitter path of the transistor. A first diode is coupled between the transistor and a point of reference potential, and is in series with the collector-to-emitter path of the transistor and poled to be of like polarity to the base-emitter junction of the transistor. A capacitor is coupled in parallel with the first diode, and a second diode is coupled in parallel with the inductive load and is poled in an opposite sense to the first diode. The second diode is chosen to have a voltage drop such that a negative voltage impulse from the inductive load will be clipped at a voltage which is the difference between the voltage drops of the first and second diodes.

REFERENCES:
patent: 3390346 (1968-06-01), Wheatley, Jr.
patent: 4023074 (1977-05-01), Fichtner
patent: 4158178 (1979-06-01), Schade, Jr.
patent: 4178619 (1979-12-01), Seiler et al.

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