The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 2017
Filed:
Aug. 23, 2013
Beijing Sifang Automation Co., Ltd., Beijing, CN;
Gang Xu, Beijing, CN;
Tao Zhang, Beijing, CN;
An Liu, Beijing, CN;
Qiurong Chen, Beijing, CN;
Wenhao Shi, Beijing, CN;
Beijing Sifang Automation Co., Ltd, Beijing, CN;
Abstract
An anti-interference switch signal transmission circuit, in which a changeover switch is used at a signal terminal, is disclosed. A normally closed contact is connected to DC−, a normally open contact is connected to DC+, and a common contact is connected to a switch signal acquisition circuit. When no signal exists, DC− is provided 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 switch 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 detected.