Abstract: The present invention provides a technical solution to reduce electromagnetic interference generated by a high-frequency switching electronic circuit. By adding a disturbance signal whose amplitude varies with time to the input pin of the active power factor correction module of the high frequency switching electronic circuit which is intended to receive an input power control signal, the switching frequency of the active power factor correction module varies with time, so that the electromagnetic interference energy is dispersed in a frequency domain and the electromagnetic interference is reduced. While the effect is even more apparent particularly when the power supply of the high-frequency switching electronic circuit is a DC power source.