Patent ID: 9679726
Date: 2017-06-13
CPC Classifications: H01H

Claim:
1. An anti-interference switch signal transmission circuit, comprising: a changeover switch having a normally open contact, a normally closed contact and a common contact, wherein, in response to a received signal, the changeover switch couples the common contact to the normally open contact; a negative terminal of a DC power supply coupled to the normally closed contact; a positive terminal of the DC power supply coupled to the normally open contact; and a switch signal acquisition circuit having a first terminal coupled to the negative terminal and a second terminal coupled to the common contact to selectively provide positive or negative voltage to the second terminal of the switch signal acquisition circuit, wherein, when no switch signal occurs, the normally open contact is open and the normally closed contact is closed so that the first and second terminal of the switch signal acquisition circuit are negative and wherein when there is a switch signal, the normally closed contact is open and the normally open contact is closed so that the first terminal of the switch signal acquisition circuit is negative and the second terminal of the switch signal acquisition circuit is positive.