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1. (WO2018120628) PROTECTION CIRCUIT BASED ON CHOKE TRANSFORMER

Pub. No.:    WO/2018/120628    International Application No.:    PCT/CN2017/086244
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Sun May 28 01:59:59 CEST 2017
IPC: B61L 1/02
H02H 7/04
Applicants: BEIJING NATIONAL RAILWAY RESEARCH & DESIGN INSTITUTE OF SIGNAL & COMMUNICATION GROUP CO., LTD.
北京全路通信信号研究设计院集团有限公司
Inventors: QIAO, Zhichao
乔志超
WANG, Zhixin
王智新
XU, Zongqi
徐宗奇
Title: PROTECTION CIRCUIT BASED ON CHOKE TRANSFORMER
Abstract:
A protection circuit based on a choke transformer, comprising: a choke transformer (CT), an adapter (400), and a switch module (100). The switch module (100) comprises a first switch (S1) and a second switch (S2). When the second switch (S2) is turned off, the first switch (S1) is turned off simultaneously. A first end and a second end of a primary coil (PC) of the choke transformer are connected to two parallel steel rails (200), respectively. A first end of a first secondary coil (SC1) of the choke transformer is connected to a first end of a signal module (300), and a second end of the first secondary coil (SC1) is connected to a second end of the signal module (300) by means of the first switch (S1). A first end of a second secondary coil (SC2) of the choke transformer is connected to a first end of the adapter (400) by means of the second switch (S2), and a second end of the second secondary coil (SC2) is connected to a second end of the adapter (400). When a circuit where the second secondary coil (SC2) is located is disconnected, the circuit where the first secondary coil (SC1) is located is disconnected simultaneously, so that a traction current is prevented from invading a signal channel to cause a device to be burned, and the problem of risks to the traveling safety due to shunt detection result errors caused by rising of the voltage of the circuit where the first secondary coil (SC1) is located is avoided.