Transistor protective circuit with imminent failure sensing

Details Transistor protective circuit with imminent failure sensing Transistor protective circuit with imminent failure sensing

G - Physics

05

F

323/8

G05F 1/44 (2006.01) H02H 3/36 (2006.01) H02H 7/20 (2006.01)

Patent

CA 1042070

TRANSISTOR PROTECTIVE CIRCUIT WITH IMMINENT FAILURE SENSING Abstract of the Disclosure One or more selected transistors of a plurality of like transistors of a set, operated in parallel, are insulated thermally from a heat sink while the remainder of the transistors are in direct thermal contact with the heat sink. The output signal from the thermally insulated transistor(s) is compared against the output of the remaining transistors and a difference signal is produced. Any departure from normal operation is sensed whereupon the difference signal activites control circuitry for initiating protective action prior to multiple transistor failure. The thermally insulated transistor(s) is thus made to be in greater jeopardy than the remainder, thereby providing a reliable warning means of imminent failure.

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