| 摘要 |
PURPOSE:To prevent malfunction or destruction of memory content information of a load side by sending a start/stop signal after an output switch is turned on and a stable output voltage is supervised without sending the start/stop signal as soon as a power switch is applied in case of supplying power to an electronic exchange. CONSTITUTION:Applying a power switch 3, supervising circuits 5, 6 supervise an output voltage of aline feeding system and a central processing feeding system and when the output voltage reaches a stable region, a diode side of a photocoupler at a sequence circuit 2 is driven to make the transistor side of the photocoupler in a start/stop circuit 4 conductive. Thus, a system start/stop signal is sent to the load side. In case of applying the output switch by the monitor circuits 5, 6, since the rush current flowing time caused in a capacitive load is masked by throwing the output switch, the drooping state of the output to the central processing system is not caused regardless of the start signal being sent.
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