Thermal limit circuit with built-in hysteresis

Details Thermal limit circuit with built-in hysteresis Thermal limit circuit with built-in hysteresis

1997-02-05

1998-08-18

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327512, H03K 3037

Patent

active

057962804

ABSTRACT:
A thermal shut down circuit with built-in temperature hysteresis, comprising first and second transistors configured as a bistable trigger circuit. The two transistors switch either a first or second emitter current through a bias resistor, thereby establishing a voltage hysteresis. By applying a reference voltage to the base of the first transistor, temperature dependent state transitions occur. A buffer transistor coupled to the collector of the second transistor allows the thermal shut down circuit to turn ON or OFF an auxiliary circuit. Thermal communication between the auxiliary circuit and the base-emitter junction of the first transistor allows the thermal shut down circuit to shut down the auxiliary circuit when the temperature exceeds a shutdown temperature, and thermal hysteresis built into the thermal shut down circuit prevents undesirable ON-OFF oscillation of the auxiliary circuit.

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