Sound detection device based on working state of high-frequency switching power supply

The utility model discloses a sound detection device based on the working state of a high-frequency switching power supply. The frequency mixer comprises an input loop, a main vibration frequency mixing circuit electrically connected with the input loop, a beat frequency oscillator electrically connected with the main vibration frequency mixing circuit, and an output loop. The beat frequency oscillator is used for generating an oscillation signal with the frequency corresponding to the oscillation frequency generated when the high-frequency switching power supply works; the input loop detectsa high-frequency signal of the high-frequency switching power supply, and the main vibration mixing circuit mixes the high-frequency signal received by the input loop with an oscillation signal generated by the beat frequency oscillator and outputs an audio signal after difference frequency to the output loop. The sound detection device of the utility model can realize the sound detection functionof the working state of t