Magnetic components have become one of the main factors restricting the development of switching power supply. In order to meet the development requirements of high transmission efficiency

high power density and energy bi-directional flow of the new generation converter

an"EIE"type magnetic integration structure is proposed for bi-directional LLC resonant converter

which integrates the primary and secondary side resonant inductors together by decoupling integration. Compared with the EI structure

the simulation analysis and experiments show that the EIE structure has an uniform magnetic position and magnetic density

strong antisaturation capability

large inductance factor and low loss. It is applied to the bi-directional LLC resonant converter

which has the advantage of improving power density and efficiency.