| Based on the lab has developed the electromagnetic repulsion mechanism for ultra fast disconnect switch, this paper focus on the research for charging power supply of electromagnetic repulsion mechanism. The researching power supply which input from the power net can realize constant current charging for energy storage capacitors, satisfied the characteristics such as high charge voltage, low charge current and so on. Meanwhile, in order to improve the efficiency of the power system and reduce the harmonic pollution on the grid, power factor correction technology has been applied in the circuit.This article firstly introduces the development and research status of the capacitor charging technology in the domestic and overseas. Through the summary and comparison of the high frequency resonant charging technique, the LCL-T half-bridge resonant charging technology has been raised. On this basis, two stages architecture for the charging power supply studied in this paper has been put forward: the proceeding stage is power factor correction circuit, the backward stage is capacitor charging circuit based on LCL-T resonant converter.For the power factor correction circuit, several typical topologies of active power factor correction have been analyzed, and their advantages and disadvantages are compared as well. The Boost circuit under CCM is chosen as the PFC main circuit. The control strategies of the Boost PFC have been analyzed and compared, and the average current control method has been adopted in this paper. By using state-space averaging method, the small-signal model of Boost PFC has been researched and the simplified average-small-signal model of the system has been built. The dissertation develops design method of PI regulators that are applied in double closed-loops system.For capacitor charging circuit based on LCL-T resonant converter, firstly working mode of LCL-T resonant converter is analyzed, and then the principle of LCL-T resonant converter having constant characteristics is presented by using AC analytical method. Current transmission characteristic and phase characteristic of the LCL-T resonant converter is analyzed as well. Based on this, the capacitor charging circuit based on LCL-T resonant convert with clamp diode is put forward. Then, charging process and performance of the capacitor charging circuit is analyzed. The parameter design process of the capacitor charging circuit is proposed.Finally, on the basis of theoretical analysis, TMS320F2812 is chosen as the control chip and the system parameters are designed. The capacitor charging circuit based on LCL- T resonant converter is built. The experimental results verify the correctness of the theoretical analysis and design. |
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