| 摘要 |
An anti-interference switch signal transmission circuit, in which a changeover contact is used at a signal terminal, wherein a normally closed contact is connected to DC−, a normally open contact is connected to DC+, and a common terminal is connected to a switch signal acquisition circuit. When no signal exists, DC− is connected to a positive input terminal of the switch signal acquisition circuit via the normally closed contact. Since a negative input terminal of the switch signal acquisition circuit is also connected to DC−, even if interference is caused, no false signal is generated. When a signal exists, the position of the changeover contact changes and DC+ is connected to DC− via the closed normally open contact through the switch signal acquisition circuit thus a loop is formed, so that the signal can be reflected. The interference problem is solved by connecting both the two terminals of the acquisition circuit to DC− when no signal exists. |
