Current Output Characteristics and Implementation of Soft Switch Based on LCC Resonant Converter
Wang Deyu, Duan Yuanchao, Gao He, Wang Zhenchun, Zhao Qinglin
Key Laboratory of Power Electronics for Energy Conservation and Motor drive of Hebei Province College of Electrical Engineering Yanshan University Qinhuangdao 066004 China
Abstract：In this paper, a LCC series-parallel resonant converter is analyzed and designed for the electromagnetic launch system, in which, the power supply charges for the energy-storage capacitor in the pulse forming unit (PFU). In order to meet the requirements of charging speed and pulse to pulse repeatability, the characteristics of output current and conditions of soft-switch of LCC resonant converter operating in discontinuous current mode (DCM) are studied. A capacitor energy storage method based on digital controller is proposed, that is, benefiting from the characteristics of constant current output in dual-pulse-mode, linear charging performance can be obtained. Depending on the characteristics of trickle output in single-pulse-mode, controller can make the voltage of capacitor stable. In this paper, a new algorithm of variable frequency and variable width (VFVW) is proposed. An equivalently simplified linear function is developed to fit with the critical-DCM frequency, thus critical-frequency curve can be tracked online by using digital signal processor. It can not only improve capacity of current output, but also obtain the feature of constant current charging. What's more, the designed power supply achieves zero-current soft switching in the whole operating process. By transforming the voltage gain, the converter achieves stable voltage output under 3kV through the voltage close-loop control. The experimental data verify the control algorithm.
王德玉, 段元超, 高鹤, 王振春, 赵清林. LCC谐振变换器电流输出特性研究与软开关实现[J]. 电工技术学报, 2018, 33(12): 2788-2800.
Wang Deyu, Duan Yuanchao, Gao He, Wang Zhenchun, Zhao Qinglin. Current Output Characteristics and Implementation of Soft Switch Based on LCC Resonant Converter. Transactions of China Electrotechnical Society, 2018, 33(12): 2788-2800.
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2018, Vol. 33 
