Circuit for protecting a switching transistor

Details Circuit for protecting a switching transistor Circuit for protecting a switching transistor

1988-12-13

1989-12-26

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

323276, 330207P, H02H 320

Patent

active

048901857

ABSTRACT:
A circuit for protecting a switching transistor connected between a direct-current voltage source and an inductive load has a voltage-limiting element connected between the source and the transistor for switching the transistor when the voltage of the source exceeds a predetermined limit, elements for deriving from the voltage-limiting element a control signal when the source voltage exceeds the predetermined limit, and a variable pulse-width modulator connected to a control input of the transistor and receiving the signal from the means. The modulator decreases pulse width when the source voltage exceeds the limit.

REFERENCES:
patent: 4589049 (1986-05-01), Krumrein
patent: 4672527 (1987-06-01), Lagadec et al.

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