Patent ID: 8420987

Claim:
A circuit for controlling heat of a power transistor, comprising: a thermistor-transistor integrated into one chip, which comprises a thermistor having a resistance decreasing with an increase in temperature and a control transistor, wherein the thermistor is connected between two terminals of the control transistor; and at least one power transistor which is connected to a driving device to control a supply of power to the driving device, wherein the thermistor-transistor is adhered to one of a surface and a heat-emitting part of the at least one power transistor and is connected to one of a base, a gate, a collector, and a drain of the at least one power transistor to decrease or block a current flowing in the at least one power transistor when the temperature of the at least one power transistor rises, so as to prevent the at least one power transistor from heating up.