Analysis and design of high frequency LCC resonant converter applied in corona generator for film treatment

In this paper, the analysis and design of the high frequency corona generator with LCC resonant topology applied in film treatment is proposed. The designed converter works with a specified output voltage, which makes the film treatment efficient and stable. By making the converter operate in a critical mode, the analysis and design is simplified and the resonant parameters can be described by time domain expressions. By applying magnetic integration technique, the leakage inductor of the transformer is designed to be one component of the resonant tank, which makes the whole system compact and reliable. An accurate design method of the core type transformer with a specified leakage inductor is proposed by combining the theoretic calculation and finite element simulation. The error between the practical measurement and the simulation result is less than 1%, which ensures the design accuracy to realize the critical operation mode. A 120 kHz operation frequency and 12kV output voltage prototype is built to verify the proposed analysis and design method. And the efficient experimental results of the cast polypropylene (CPP) film treatment are given.