| 摘要 |
PURPOSE:To prevent the occurrence of a discharge phenomenon, to prevent the occurrence of smoke and combustion and to secure the safety of a device by surely stopping the supply of electricity to a thick film exothermic resistor even when a ceramic plate is broken due to heat stress, etc., at the time of abnormal operation related to a heating device having the thick film exothermic resistor formed on the ceramic plate as a heat source. CONSTITUTION:This device is provided with a temperature detection means 6 of the heat source or the device, a circuit 21 controlling the drive of the exothermic resistor 5, the circuit 20 controlling the exothermic resistor control circuit 21 based on temperature detection information, a current detector 22 of the exothermic resistor 5 and first and second comparators 23, 24 respectively detecting that the detected current value is prescribed first value or above and second value or below. Further, this device is provided with a power source interruption mechanism 26 capable of stopping the drive of the exothermic resistor 5 independent of the exothermic resistor control circuit 21, the circuit 25 controlling the power source interruption mechanism 26 based on the outputs of the first and second comparators 23, 24 at the time of the state where no temperature control circuit 20 drives the exothermic resistor 5 and the state where the circuit 20 drives the resistor 5. |
