METHOD FOR REALIZING INTERPHASE CURRENT SHARING OF ILLC RESONANT CONVERTER AND PROLONGING POWER-DOWN HOLD-UP TIME

摘要

Provided is an iLLC resonant converter, comprising two LLC resonant converters, a digital controller and two switch control inductors. Power transformers of the two LLC resonant converters are respectively provided with an auxiliary winding, the two switch control inductors are respectively connected in parallel to the auxiliary windings, the parameters and structures of the two LLC resonant converters are the same, input ends of the two LLC resonant converters are connected in parallel, and output ends thereof are also connected in parallel, and the parameters and structures of the two switch control inductors are the same. According to the resonant converter provided in the present invention, the respective output currents and common input voltage of two LLC resonant converters are sampled by means of a digital controller, the phase angle of switch control inductors is adjusted through operation to realize current sharing of a resonant cavity, and the direct-current voltage gain of the resonant cavity can be adjusted according to the voltage of a direct-current bus during input power-down, thereby prolonging the power-down hold-up time of the converter.