A Burst-PWM Hybrid Control Method for Wide Output Voltage Range of LLC Converter
Shi Lin, Liu Bangyin, Duan Shanxu
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074 China
Abstract：PFM control is generally used in conventional LLC converter whose output voltage range is restricted by the limited operating frequency. A Burst-PWM hybrid control method is proposed to expand the output voltage range of the LLC converter. The characteristics and disadvantages of PWM control and Burst-mode control are firstly analyzed. When the hybrid control method is used, PWM control can reduce the resonant current and Burst-mode control can produce enough resonant current for soft switching. Then ZVS for all switches and low resonant current during burst-on time are realized over a wide range of output voltage. The stability and output performance of the converter are improved as well. The optimized design of the resonant parameters and the minimum PWM duty cycle are also analyzed based on state-plane trajectory. The experimental results verify the effectiveness and feasibility of the proposed method.
石林, 刘邦银, 段善旭. 一种基于Burst-PWM混合控制的LLC谐振变换器宽电压范围输出策略[J]. 电工技术学报, 2019, 34(22): 4772-4780.
Shi Lin, Liu Bangyin, Duan Shanxu. A Burst-PWM Hybrid Control Method for Wide Output Voltage Range of LLC Converter. Transactions of China Electrotechnical Society, 2019, 34(22): 4772-4780.
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2019, Vol. 34 
