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| Wide-Gain-Range Control Scheme for Interleaved Boost Integrated CLLLC Resonant Converter Based on Dual Pulse Width Modulation |
| Li Xiaoqiang, Ma Yongchao, Huang Jinwei, Wang Xintan, Wu Xiaojie |
| School of Electrical Engineering China University of Mining and Technology Xuzhou 221116 China |
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Abstract The interleaved Boost integrated CLLLC resonant converter has the advantages of high gain and high efficiency. A wide voltage gain range can be theoretically obtained when using PWM. However, under the existing fixed-frequency synchronous PWM modulation, an increasingly large current peak appears as the duty cycle gradually deviates from 0.5, which limits the duty cycle adjustment range. Moreover, its voltage gain range has no obvious advantages compared with the traditional resonant converter. In order to achieve wide gain, this paper adopts the method of dual pulse width modulation to overcome the shortcomings of fixed-frequency synchronous PWM, and proposes two modulation methods of fixed-frequency synchronous dual pulse width modulation and variable-frequency dual pulse width modulation. The switching points of the two modulation methods are constructed, and a wide gain control strategy is formed. The working principle and operation characteristics of the proposed wide gain control strategy are analyzed. Finally, the feasibility of the proposed control strategy and the correctness of theoretical analysis are verified by experiments.
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Received: 08 October 2021
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2022, Vol. 37 
