| 摘要 |
PURPOSE:To transmit the service interruption signal to the load prior to the change of the control voltage of the load and thus prevent the malfunction at the load side, by obtaining the next-rank and subsequent output voltage based on the highest- rank output voltage obtained from the AC voltage and at the same time producing the power supply cut-off signal. CONSTITUTION:The DC24V required for computer 3 is obtained by the 1st power supply device 4 and via the AC power source AC100V, and at the same time the control power supply DC5V for the computer 3 is produced by the 2nd power supply device 5 with the DC24V used as the input power source. The power supply short- break detector 6 applies the operation start signal to the computer 3 when the output voltage value of devices 4 and 5 each becomes to each prescribed value. Thus the malfunction can be prevented when the power supply becomes unsteady. And in case the AC power supply is cut off, the detector 6 detects the fluctuation of the output voltage DC24V of the device 4. Thus the power supply cut-off signal GR can be transmitted to the computer 3 immediately (while the output DC5V of the device 5 is kept at the prescribed voltage level). |
