JPS5789115A - Temperature controller - Google Patents

Abstract

PURPOSE:To control the temperature of an object to be heated at a certain level for a device that heats up an object to be heated like a pressure cooker, etc., by producing the numerical information showing the heating time in accordance with the detected temperature and performing the heating control by the numerical value of the numerical information plus the numerical value of the count signal. CONSTITUTION:When the cooking materials are put into a cooker and an AC power supply 3 is applied, the voltage Vd according to the temperature T is delivered from the point of connection between a thermistor 15 and a resistance 16. This voltage is converted into a detected temperature signal S1 through an A-D converter 17 to be supplied to a data converting part 18. At the beginning of application of the power supply 3, the detected temperature T is lower than 115 deg.C and a data converting part 18 is preset at the preset 20 after receiving the output of ''16'' as the digital information value D. At the same time, a driving signal S3 is delivered to turn on a thyristor 2. Thus the electric conduction is applied to a heater 1 to start heating, and a counter 20 counts the count signals S0. The ''16'' is preset again when the counter 20 counts 16 signals and then set at 0, and the heater 1 generates heat with the rated output of <=115 deg.C and then with the corresponding rated output at other levels of temperature.