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 |
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.
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