| 摘要 |
PURPOSE:To provide a positive sensing of a condition in which a power interruption sensing circuit is released or troubled to the short circuited condition and prevent an erroneous operation of a micro-computer by a method wherein the number of pulse signals from a wave-form shaping circuit is counted and the power interruption is sensed. CONSTITUTION:A wave form shaping circuit comprised of a diode bridge 20 for displaying a clock to send a pulse signal to an input terminal Si of a micro- computer 11', and of a transistor 22 and a resistor 21 is utilized as a power interruption sensing circuit. That is, the pulse signal supplied from the wave form shaping circuit composed of the transistor 22 and the resistor is utilized to detect the power interruption. In case that the power interruption sensing circuit for a transistor 22 or the like is released or troubles to the short circuit, a signal to be inputted to the input terminal Si of the micro-computer 11' becomes only 'H' or 'L' signal and does not become a pulse signal. Therefore, the counted value to be counted in a step 90 is 0 per second, that is, does not exceed 10 and then the operation is stopped as the power interruption occurs. |
