| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply interrupt circuit that can stop damages to the panel to a minimum level by automatically turning on and off the power supply switch on the panel. SOLUTION: When a power switch 1 is connected by a manual power switch 2, power is supplied to the panel. After power is supplied, an alarm signal output from an alarm detector 3 is masked by a mask signal output from a monostable multivibrator 6, until the power supply voltage becomes stabilized. After the mask signal is terminated, the alarm detector 3 outputs an alarm signal, when it detects an abnormality in the power supply. The alarm signal is held in a HOLD circuit 4 and input into an AND circuit 5 via an OR circuit 7. The output signal of the manual power switch 2 is input as the other input in the AND circuit 5; when the output signal of the ADD circuit 5 is ON ('H' level), the power switch 1 is cut off and the power supply is stopped. When a reset signal is input in the HOLD circuit 4, the alarm signal is canceled. COPYRIGHT: (C)2003,JPO
|
