| 摘要 |
PURPOSE: A heater operation condition monitoring circuit and a method thereof are provided to minimize the volume by removing an A/D converter and microprocessor. CONSTITUTION: A current amperometer sensor outputs the voltage value according to the power current value by detecting the supply current provided to the power source of a heater. A disorder condition detection unit(20) decides the voltage value escaping the predetermined voltage area value. The disorder condition detection unit comprises an excess current monitor(21) which in advance watches the fixed the maximum set value or greater voltage value and a low current monitor(25) which in advance watches the fixed the minimum set value or less voltage value. The excess current monitor comprises the maximum output comparator outputting the disorder condition signal. |
