H - Electricity – 02 – H
Patent
H - Electricity
02
H
356/24, 324/59
H02H 5/04 (2006.01) H02H 6/00 (2006.01)
Patent
CA 1046646
ABSTRACT OF THE DISCLOSURE A current sensor provides a voltage signal which is proportional to the average current flowing through a semiconductor junction. This voltage is then applied to a first analogue circuit which produces an output voltage indicative of the average power dissipated at the junction. This voltage is then applied to a second analogue circuit which outputs a voltage signal indicative of the temperature difference between the junction and the heat sink. The voltage from the first analogue circuit is also applied to a third analogue circuit which outputs a voltage signal indicative of the temperature difference between the heat sink and the ambient. The ambient temperature is sensed by an ambient temperature sensor which outputs a voltage signal indicative of the ambient temperature. A voltage summing circuit sums the output voltages from the second and third analogue circuits and from the ambient temperature sensor, and produces an output voltage indicative of the junction temperature.
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