To meet the demand of high efficiency, high power density and good input and output performance for high power high voltage converter, the high frequency AC-link scheme, below resonance mode of LCC resonant circuit and soft-switched control method are combined in the proposed converter. The AC-link scheme can bring good performance at input port with small size, the continuous mode can reduce the peak current value in switches and the conduction loss, soft-switching character can reduce the switching loss. To make the combination applicable in high voltage application, this study introduces a control method including switch commutation, control algorithm and control block diagram. To verify accuracy of control parameters and feasibility of the proposed converter, the simulation and experiment are conducted on a 50 kV, 80 kW prototype. It turns out that the experiment results are in agreement with simulation and theoretically expected results. The experimental results also show that the output voltage ripple is less than 1% at 50 kV, the input power factor is 0.99, the total harmonic distortion of input current is less than 7.5%, the total efficiency is 94.5% and power density is 0.93 W/cm 3 .