Abstract: The present disclosure discloses a composite switching circuit, including a plurality of first semiconductor devices connected in series; and at least one second semiconductor device each connected in parallel to one of the plurality of first semiconductor devices. The composite switching circuit is connected to an input source. The second semiconductor device is turned off during a preset period to transfer a current flowing through the second semiconductor device to the first semiconductor devices connected in parallel to the second semiconductor device.

Abstract: The present disclosure provides a control method for an AC-DC conversion circuit. The method includes: in an entire load range, acquiring circuit parameter information of the AC-DC conversion circuit; limiting an actual switching frequency or an actual switching period of the AC-DC conversion circuit within a preset working range according to the circuit parameter information. The AC-DC conversion circuit can meet requirements of Total Harmonic Distortion (THD), Power Factor (PF), efficiency and Electromagnetic Interference (EMI) and the like by adjusting the working information of the AC-DC conversion circuit through the preset working range.

Abstract: The present disclosure provides a control method for an AC-DC conversion circuit. The method includes: in an entire load range, acquiring circuit parameter information of the AC-DC conversion circuit; limiting an actual switching frequency or an actual switching period of the AC-DC conversion circuit within a preset working range according to the circuit parameter information. The AC-DC conversion circuit can meet requirements of Total Harmonic Distortion (THD), Power Factor (PF), efficiency and Electromagnetic Interference (EMI) and the like by adjusting the working information of the AC-DC conversion circuit through the preset working range.

Abstract: The present disclosure provides a control method for an AC-DC conversion circuit. The method includes: calculating working information of an AC-DC conversion circuit according to at least one circuit parameter information of an input voltage, an input current, an output voltage, and an output current of the AC-DC conversion circuit; comparing the working information of the AC-DC conversion circuit with a preset working range to obtain an actual switching frequency or an actual switching period of the AC-DC conversion circuit. The AC-DC conversion circuit can meet requirements of Total Harmonic Distortion (THD), Power Factor (PF), efficiency and Electromagnetic Interference (EMI) and the like by adjusting the working information of the AC-DC conversion circuit through the preset working range.

Abstract: The present disclosure discloses a composite switching circuit, including a plurality of first semiconductor devices connected in series; and at least one second semiconductor device each connected in parallel to one of the plurality of first semiconductor devices. The composite switching circuit is connected to an input source. The second semiconductor device is turned off during a preset period to transfer a current flowing through the second semiconductor device to the first semiconductor devices connected in parallel to the second semiconductor device.

Abstract: The present disclosure provides a control method for an AC-DC conversion circuit. The method comprises: calculating working information of an AC-DC conversion circuit according to at least one circuit parameter information of an input voltage, an input current, an output voltage, and an output current of the AC-DC conversion circuit; comparing the working information of the AC-DC conversion circuit with a preset working range to obtain an actual switching frequency or an actual switching period of the AC-DC conversion circuit. The AC-DC conversion circuit can meet requirements of THD, PF, efficiency and EMI and the like by adjusting the working information of the AC-DC conversion circuit through the preset working range.