AUTOMATIC TEMPERATURE CONTROL DEVICE FOR AN ELECTRIC APPLIANCE SUCH AS AN ELECTRIC BLANKET

摘要

The automatic temperature control device for an electric appliance such as an electric blanket comprises a heater element, a sensor made of a thermosensitive material having an impedance, which changes as the temperature varies, for detecting the temperature of the heater element, a switching element such as an SCR for regulating the supply of electric power to the heater element, and a plurality of electronic circuits comprising specifically a pulse supplying circuit and a pulse discriminating circuit for driving the switching element in response to an output signal from the sensor, thereby assuring a safe operation of the automatic temperature control device against the occurrence of any failure.