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LCC resonant converter is the core device of the Electrostatic Precipitator High-frequency high-voltage power supply , very suitably for high pressure high-power situation, in view of insufficient of the continuous model applied to the Electrostatic Precipitator high frequency high voltage power supply, this paper adopts intermittent mode of the LCC resonant converter to optimize design.This paper analyze the working principle and topology of LCC resonant converter intermittent mode with RC load, and its mathematical model is deduced, using the state space approach to study and the establishment of a novel LCC resonant converter loss model of intermittent mode.Based on this advances a kind of LCC resonant converter optimization design method based on Genetic Particle Swarm optimization algorithm, this method is intuitive and accurate, and realizes the soft switch technology, improves the efficiency of the power supply.The scene verifies the accuracy of this article through a 72 kv / 85 kw Electrostatic Precipitator High-frequency high-voltage power supply model machine.