PANEL CONTROL CIRCUIT FOR INFORMATION PROCESSOR

摘要

PURPOSE:To prevent a malfunction caused in a power-on mode by using a stabilizing signal to lock the unstable signal for a fixed period. CONSTITUTION:Another stable power supply fixing signal 10 is fetched into a panel control circuit in addition to a power-off request signal 3 containing a noise factor. A power-off permission signal producing circuit is added to produce a signal 15 which inhibits the output of the power-off command signals 5 and 18 for a fixed period. The signal 15 is supplied to an AND circuit 109 and the stable signal 5 can be delivered. It is possible to supply the stable signal to a power supply unit just with addition of a simple circuit even under the conditions where the noise effects are received easily owing to use of a relayless electronis circuit using a photocoupler. This improves greatly the reliability of a panel control circuit for an information processor.