US 12,301,097 B2
Fault prediction method and apparatus for power conversion device, and power conversion system
Yiqiang Chen, Guangdong (CN); Yihang Lin, Guangdong (CN); Bo Hou, Guangdong (CN); Dazhi Wang, Guangdong (CN); Shuo Zhang, Guangdong (CN); and Xiangzhen Cai, Guangdong (CN)
Assigned to China Electronic Product Reliability and Environmental Testing Research Institute ((The fifth electronic research institute of Ministry of Industry and Information Technology) (CEPREI Laboratory)), (CN)
Filed by China Electronic Product Reliability and Environmental Testing Research Institute ((The fifth electronic research institute of Ministry of Industry and Information Technology) (CEPREI Labratory)), Guangdong (CN)
Filed on Jan. 9, 2023, as Appl. No. 18/151,837.
Claims priority of application No. 202210954434.X (CN), filed on Aug. 10, 2022.
Prior Publication US 2024/0055976 A1, Feb. 15, 2024
Int. Cl. H02M 1/32 (2007.01); G01R 15/18 (2006.01); H02M 7/48 (2007.01); H02M 7/5387 (2007.01)
CPC H02M 1/32 (2013.01) [G01R 15/181 (2013.01); H02M 7/4815 (2021.05); H02M 7/5387 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A fault prediction method for a power conversion device, comprising:
acquiring multiple output voltages of a detecting coil in a preset time period, wherein an electromagnetic induction is generated between the detecting coil and a switching-on circuit of a switching transistor in the power conversion device;
extracting each output frequency corresponding to each output voltage of the detecting coil;
predicting time when the power conversion device fails according to a change trend of each output frequency.