Multi-source active clamp conversion circuit control method and multi-source active clamp conversion circuit

Abstract

This invention relates to the field of power grid supply and discloses a control method and circuit for a multi-source active clamping conversion circuit. The control method includes: controlling the bus power supply channel or external power supply channel of the multi-source active selection circuit to be turned on, while the remaining channels are turned off, and detecting the voltage of each channel to determine whether a power switching condition is triggered; when the power switching condition is not triggered, controlling the main switching circuit to operate in the first duty cycle; when the power switching condition is triggered, entering a soft transition time window, controlling all channels of the multi-source active selection circuit to be turned off, and controlling the active clamping circuit to discharge to the secondary load of the transformer through the clamping energy recovery circuit; when the soft transition time window ends, controlling the external power supply channel to be turned on, and controlling the main switching circuit to operate in the second duty cycle. This invention, through the soft transition time window, converts residual charge into active power of the secondary load, eliminating current spikes and improving energy utilization during voltage source switching.