Soft switching topological circuit in boost or buck converter

摘要

The invention relates to a soft switching topological circuit. A zero voltage turn-on is realized when the main switch is turned on, by utilizing the resonance of the resonant inductor and the resonant capacitor after the auxiliary switch is turned on. Moreover, during the turn-off of the main switch, the resonant inductor withstands a voltage drop, which causes the energy-feed device corresponding to the auxiliary switch to feed no energy out when the auxiliary switch is turned on, thereby realizing zero current turn-on of the auxiliary switch, and increasing the circuit running efficiency.