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Title:
INSULATION DETECTION CIRCUIT AND METHOD, AND BATTERY MANAGEMENT SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/177636
Kind Code:
A1
Abstract:
An insulation detection circuit and method, and a battery management system. The circuit comprises: a first isolation module (G1) connected to a positive electrode of a power battery to be detected and one end of a sampling module (H); the sampling module (H), with the other end thereof connected to one end of a signal generating module (S); the signal generating module (S), with the other end thereof connected to the power ground, for providing an injected signal for said power battery; and a processing module (P) for determining, according to a first sampling signal collected from one end of the sampling module (H) and a second sampling signal collected from one end of the signal generating module (S), a capacitance value of a capacitance module between said power battery and the power ground, and for adjusting the frequency of the injected signal based on the capacitance value, wherein the processing module (P) is further used for obtaining, according to a third sampling signal collected from one end of the sampling module (H), a fourth sampling signal collected from one end of the signal generating module (S) and the adjusted frequency of the injected signal, an insulation resistance value of said power battery. The accuracy of insulation detection is thus improved.

Inventors:
DAN ZHIMIN (CN)
LI MENG (CN)
ZHANG WEI (CN)
HOU YIZHEN (CN)
SUN WEIPING (CN)
LIU CHANGJIAN (CN)
Application Number:
PCT/CN2020/077261
Publication Date:
September 10, 2020
Filing Date:
February 28, 2020
Export Citation:
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Assignee:
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD (CN)
International Classes:
G01R27/18; G01R31/385; G01R31/389
Foreign References:
CN108445397A2018-08-24
CN103777080A2014-05-07
CN106324462A2017-01-11
CN108333492A2018-07-27
US4896115A1990-01-23
CN107991625A2018-05-04
CN107894543A2018-04-10
CN207817067U2018-09-04
CN102749562A2012-10-24
Attorney, Agent or Firm:
BEIJING EAST IP LTD. (CN)
Download PDF:
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