| CPC H02M 1/32 (2013.01) [G01R 15/181 (2013.01); H02M 7/4815 (2021.05); H02M 7/5387 (2013.01)] | 10 Claims |

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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.
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