LCC谐振变换器电流输出特性研究与软开关实现

doi:10.19595/j.cnki.1000-6753.tces.170435

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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.

Key words： Pulse forming unit charging power system LCC resonant critical discontinuous current soft switching trickle power supply

Received: 12 April 2017 Published: 22 June 2018

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TM910

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	Wang Deyu
	Duan Yuanchao
	Gao He
	Wang Zhenchun
	Zhao Qinglin

Cite this article:

Wang Deyu,Duan Yuanchao,Gao He等. Current Output Characteristics and Implementation of Soft Switch Based on LCC Resonant Converter[J]. Transactions of China Electrotechnical Society, 2018, 33(12): 2788-2800.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170435 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I12/2788

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