Transactions of China Electrotechnical Society  2017, Vol. 32 Issue (8): 208-219    DOI:
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Asymmetrical Phase Shift Control and Efficiency Optimization Strategy for LCC Resonant Converter
Gao Tiefeng1, Zhang Sen1, Zhao Jianfeng1, Zhang Yunlong2
1. School of Electrical Engineering Southeast University Nanjing 210096 China;
2. Zhongke Tiangong Co. Ltd Yancheng 224400 China

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Abstract  In this paper, an asymmetrical phase-shift (APS) control for the series-parallel (LCC-type) resonant converter was proposed. A pulse width modulation (PWM) and phase-shift combined modulation scheme was implemented to achieve two independent control variables, which introduced additional degrees of freedom in control. The steady-state characteristics of the converter were analyzed including output power, zero-voltage switching (ZVS) operation and resonant current. This analysis demonstrates that different combinations of duty cycle and phase shift angle can achieve the same output power, leading to distinct root mean square (RMS) resonant currents and affecting ZVS operation. An efficiency optimization strategy based APS control was then proposed to deliver a specific output power with minimized RMS resonant current while maintain ZVS. As such, the efficiency of the converter is improved in a wide load variation range. The theoretical analysis and the validity of the proposed method has been verified by the results of simulation and a 1.9kW prototype.
Key wordsResonant      converter,      asymmetrical      phase-shift      (APS)      control,      zero-voltage      switching      (ZVS),      efficiency      optimization     
Received: 30 September 2016      Published: 02 May 2017
PACS: TM46  
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Gao Tiefeng
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Zhang Yunlong
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Gao Tiefeng,Zhang Sen,Zhao Jianfeng等. Asymmetrical Phase Shift Control and Efficiency Optimization Strategy for LCC Resonant Converter[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 208-219.
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