Title:
INSULATION DETECTION METHOD, SYSTEM AND DEVICE BASED ON VARIABLE-FREQUENCY SMALL SIGNAL INJECTION
Document Type and Number:
WIPO Patent Application WO/2024/078174
Kind Code:
A1
Abstract:
An insulation detection method, system and device based on variable-frequency small signal injection. The insulation detection method comprises: generating a first sinusoidal alternating current voltage signal according to a first frequency, and generating a second sinusoidal alternating current voltage signal according to a second frequency; presetting a circuit model in a power battery system, and according to the first sinusoidal alternating current voltage signal, obtaining a first voltage, a first current, and a first phase from the circuit model; calculating a first impedance real part; according to the second sinusoidal alternating current voltage signal, obtaining a second voltage, a second current, and a second phase from the circuit model; calculating a second impedance real part; calculating a first equivalent value of the first impedance real part and a second equivalent value of the second impedance real part on the basis of the circuit model; and calculating an insulation resistance value of the circuit model according to the first impedance real part, the second impedance real part, the first equivalent value, and the second equivalent value.
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Inventors:
LEI JINGJING (CN)
CHEN ZHOU (CN)
CHEN BINBIN (CN)
CHEN ZHOU (CN)
CHEN BINBIN (CN)
Application Number:
PCT/CN2023/115800
Publication Date:
April 18, 2024
Filing Date:
August 30, 2023
Export Citation:
Assignee:
SUNWODA MOBILITY ENERGY TECH CO LTD (CN)
International Classes:
G01R31/389; G01R27/02; G01R31/14
Foreign References:
| CN115902670A | 2023-04-04 | |||
| CN113252980A | 2021-08-13 | |||
| CN108445397A | 2018-08-24 | |||
| CN108802494A | 2018-11-13 | |||
| CN110108940A | 2019-08-09 | |||
| CN206161785U | 2017-05-10 | |||
| KR101406546B1 | 2014-06-11 |
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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