| 摘要 |
PURPOSE:To prevent the deterioration of performance of a motor, a solenoid, etc. owing to the damage caused by burning by detecting via a detecting means that the output signal of a microprocessor is kept ON or OFF for a prescribed period of time or longer and therefore deciding the abnormality of the microprocessor to break a power supply. CONSTITUTION:A microprocessor 1 is programmed so as to output a basic clock 101 from an output port in a normal action mode. If the processor 1 has abnormality, the clock 101 is not outputted from the output port and this port is fixed at a logic level 1 or 0. When the port is fixed at a logic level '0', a transistor Q1 is kept off and therefore a capacitor C1 is continuously charged through resistors R1 and R2. Then the charging voltage level signal 103 exceeds the input threshold level of an OR gate circuit 3. Thus the output signal 105 of the circuit 3 is outputted and supplied to a power supply control part 4. The part 4 turns off the power supply.
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