Thermal shutoff circuit

Details Thermal shutoff circuit Thermal shutoff circuit

1986-12-01

1988-03-22

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323317, 323907, G05F 320

Patent

active

047331623

ABSTRACT:
A thermal shutoff circuit for controlling current to an external circuit in response to changes in the temperature of the shutoff circuit. The thermal shutoff circuit includes a source for supplying a voltage which varies with changes in temperature, and a switch circuit responsive to the temperature variable voltage for interrupting the current to the external circuit when the temperature of the shutoff circuit exceeds a predetermined amount. The switch circuit has a detection transistor having a base connected to the temperature variable voltage source for generating a base current responsive to the temperature variable voltage and a compensation transistor connected in series to the detection transistor for generating an equivalent base current.

REFERENCES:
patent: 4008441 (1977-02-01), Schade, Jr.
patent: 4283673 (1981-08-01), Lieux
patent: 4380740 (1983-04-01), Kaplan
patent: 4381484 (1983-04-01), Jarrett
patent: 4528496 (1985-07-01), Naokawa et al.
patent: 4553048 (1985-11-01), Bynum et al.
"Audio/Radio Handbook", National Semiconductor Corporation, 1980, p. 4--4.

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