US 12,135,359 B2
Open-circuit fault detection method and apparatus, and computer device
Wei Yu, Guangdong (CN); Jin Zhao, Guangdong (CN); and Shaohui Li, Guangdong (CN)
Assigned to EAST GROUP CO., LTD., Dongguan (CN)
Appl. No. 17/760,223
Filed by EAST GROUP CO., LTD., Guangdong (CN)
PCT Filed Oct. 14, 2021, PCT No. PCT/CN2021/123770
§ 371(c)(1), (2) Date Aug. 5, 2022,
PCT Pub. No. WO2022/156274, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 202110070833.5 (CN), filed on Jan. 19, 2021.
Prior Publication US 2023/0071191 A1, Mar. 9, 2023
Int. Cl. H02M 3/00 (2006.01); G01R 23/16 (2006.01); G01R 31/40 (2020.01); G01R 31/54 (2020.01); H02H 7/12 (2006.01); H02M 3/335 (2006.01)
CPC G01R 31/54 (2020.01) [G01R 23/16 (2013.01); G01R 31/40 (2013.01); H02H 7/1213 (2013.01); H02M 3/01 (2021.05); H02M 3/33584 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An open-circuit fault detection method, adapted for detecting an open-circuit fault in a CLLLC resonant bidirectional DC/DC converter, and the open-circuit fault detection method being a computer-implemented method and using a computer to perform steps comprising:
acquiring, by a sampling module, an electrical signal data set including current electrical signal data and a first amount of electrical signal data, and the electrical signal data being sample data of an electrical signal at a primary side of a transformer in the CLLLC resonant bidirectional DC/DC converter;
performing, by an analysis module, spectrum analysis on the electrical signal data to obtain amplitude-frequency information of the electrical signal data, and regarding a frequency corresponding to a maximum amplitude in the amplitude-frequency information as a first frequency; and
determining, by a judging module, whether an open circuit fault occurs in the CLLLC resonant bidirectional DC/DC converter according to the first frequency and an actual switching frequency of the CLLLC resonant bidirectional DC/DC converter;
wherein the c computer-implemented method further uses the judging module to perform steps comprising:
calculating a difference between the first frequency and the actual switching frequency; and
determining that an open circuit fault occurs in the CLLLC resonant bidirectional DC/DC converter, once the difference is greater than a first preset threshold.