| 摘要 |
PURPOSE:To provide a temperature control device which stably functions even against the noise of an induction heating cooker, and is accurate equally in measurement and resolution even in the wide temperature range of measurement by switching the value of base resistance. CONSTITUTION:When a pan 9 is heated, input voltage to the input terminal of the A/D converter of a temperature measuring means 5 starts increasing. And if an increase in temperature is continued as it is, input voltage comes up to Vdd as close as possible, so that input voltage is hardly changed even when temperature is changed to a great extent. When combined resistance Rx which is the sum of base resistance R0 and R1 through R8, is therefore made to be new base resistance by closing the SW8 of a base resistance changing means 6, input voltage can thereby be lowered. When closing SW1 is then kept on in order while being started from the SW8, the A/D conversion is carried out in the specified temperature range and in the specified input voltage range for the change of the measured temperature of a thermister 4. By this constitution, temperature can be measured with almost equal accuracy. |
