Abstract: A hybrid control method which integrates charge and frequency control methods is adopted based on half-bridge LLC resonant converter. Compared with the current control methods such as charge-type control, dual-frequency control, average current-mode control, PWM-PFM hybrid control and PLL control, this control method can improve the energy transmission efficiency, increase the frequency compensation slope, make the compensator design very simple, improve the transient performance of the line and reduce output capacitor value. According to the equivalent circuit of half-bridge LLC resonant converter obtained by fundamental wave analysis method, the relationship between DC gain and quality factor, normalized frequency resonance and the ratio of inductance to excitation inductance is determined, and appropriate resonant device parameters are designed. A 5 kW/±85 V half-bridge LLC resonant converter is built according to the hybrid control method and the designed LC resonant parameters. The experimental results show that the prototype has good dynamic characteristics and can obtain stable output voltage and high transmission efficiency. The feasibility of the control method and the design of LLC resonant parameters is verified.