| 摘要 |
a monostable multivibrator coupled to a relay driving port of a microcomputer through a differentiator; an OR gate for logically summing the output of the monostable multivibrator and the signal of the port; a relay coupled to the OR gate through a transistor; and a door sensing switch for supplying a door sensing signal to the microcomputer, thereby preventing relay contacts from being welded.
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