Protective apparatus for power transistor

Details Protective apparatus for power transistor Protective apparatus for power transistor

1992-06-29

1995-01-17

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 91, 361 98, H02H 504

Patent

active

053830830

ABSTRACT:
A protective apparatus for a power transistor which detects an abnormal temperature of a power transistor and cuts a load to the power transistor to prevent possible breakdown of the power transistor. The protective apparatus comprises detecting means which detects a junction temperature of the power transistor on the real time basis from a base-emitter voltage of the power transistor. When the junction temperature of the power transistor is excessively high, a protective circuit produces an output signal, and a muting circuit applies muting to an input signal to or a current flow through the power transistor.

REFERENCES:
patent: 3808545 (1974-04-01), Stanley
patent: 4330809 (1982-05-01), Stanley
patent: 4355341 (1982-10-01), Kaplan
patent: 4355344 (1982-10-01), Felici
patent: 4611180 (1986-10-01), Stanley
patent: 4787007 (1988-11-01), Matsumura

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