Buck-boost direct current charging module based on LLC resonance and double transistors and design and control method

The invention aims to solve the problems that the existing LLC converter is low in voltage regulation capability, and high working efficiency is difficult to realize while wide gain regulation capability is realized. The invention provides a buck-boost direct current charging module based on LLC resonance and double transistors and a design and control method thereof, the buck-boost direct current charging module has the characteristics of wide gain and high efficiency at the same time, and comprises a novel direct current input and direct current output charging module, a topological structure of a novel charging module converter, a resonant cavity excitation inductance parameter design method and a novel control strategy. The charging efficiency of the designed charging module is kept above 97% under the requirements of different modulation frequencies, different output voltages and different output powers, and the performance of charging equipment and the reliability of a system are effectively improved. 本