Instantaneous junction temperature detection

Details Instantaneous junction temperature detection Instantaneous junction temperature detection

1998-05-18

2000-05-09

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307125, H01H 3500

Patent

active

060607920

ABSTRACT:
A circuit, for detecting a junction temperature of an insulated gate bipolar transistor (IGBT) which is alternately biased on and off in response to a gate signal, includes a differentiator circuit operable to receive a collector to emitter voltage of the IGBT and produce an output voltage proportional to a rate at which the collector to emitter voltage changes; and a feedback circuit operable to receive the output voltage and alter the gate signal when the output voltage indicates that the rate at which the collector to emitter voltage changes is outside a predetermined limit.

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