High power density high voltage power supply based on AC-link

High power density is one of the developing directions of the high voltage converter. The converter based on AC-link has less energy conversion steps than the DC-link based; With the same switches, the transferred power capacity with continuous current mode of resonant circuit could be nearly 2 times than with the discontinuous mode, so converter based on AC-link and with continuous current mode of LCC(or SPRC) resonant circuit is proposed as a high voltage power supply to fulfill the demands of high efficiency and high power density, the difficulties of the proposed converter include the commutation and control algorithm. This paper focuses on the control algorithm, the theoretical expressions of control parameters are deduced with energy conversation rule and state-plane diagram method. This paper gives the simulation and experimental results of a 10kV, 20kW prototype, the simulation results show the accuracy of the theoretical solutions and good input performances of the converter, and the preliminary experimental results show the safety of commutation and feasibility of the proposed converter.

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