| 摘要 |
PURPOSE: A heating line thermal-shut-down circuit is provided, which implements electric safety by completely blocking generation of heat of a hotwire. CONSTITUTION: A heating line thermal-shut-down circuit of an electric warm water-mat temperature controller is constituted as follows. If a user selects the set temperature using an adjustment switch, existence and nonexistence of the trigger pulse of the power control device are confirmed by a temperature control circuit. First and second heating circuits(10,20) are formed to control heat generation motion of the hotwire. The overheat detect line(100) is formed between the power control device of first and second heating circuits and heating wire circuit. The overheat detection line delivers heating voltage to the temperature control circuit. When a heating voltage is detected in the state of no trigger signal and the preset temperature, a detection confirmation element is driven in the temperature control circuit. The thermal shutdown circuit(200) is formed. |
