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<p>In this paper, a two-stage cascaded input-parallel output-parallel (IPOP)LLC resonant converter with three-phase voltage PWM rectifier (VSR) structure is proposed for an on-board charging system. According to the influence of the system voltage gain on the resonant network parameters and the system current equalization characteristics, the control strategy of frequency conversion voltage regulation and phase shift current sharing is determined in the rear stage, and the system has a wide range of output voltage characteristics and small output current ripple. To enhance the response speed of the converter, a nonlinear frequency rapid control mode was proposed. The simulation model is built for verification, and the results show that the pre-stage converter can generate a stable DC bus voltage and realize the PFC function, and the post-stage converter can realize soft switching in the full load range, which effectively improves the system efficiency. A 3.3&#xa0;kW two-stage on-board charging system experimental platform is built, and the experimental platform is tested under different load conditions. According to the experimental results, the overall system efficiency is consistently higher than 94.5%, and the efficiency above half-load is higher than 96.3%.</p>

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Research on Two-stage Output-parallel On-board Charging System and its Control Technology

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Kai Zhou,
  • Hongkun Li,
  • Yanze Wu

摘要

In this paper, a two-stage cascaded input-parallel output-parallel (IPOP)LLC resonant converter with three-phase voltage PWM rectifier (VSR) structure is proposed for an on-board charging system. According to the influence of the system voltage gain on the resonant network parameters and the system current equalization characteristics, the control strategy of frequency conversion voltage regulation and phase shift current sharing is determined in the rear stage, and the system has a wide range of output voltage characteristics and small output current ripple. To enhance the response speed of the converter, a nonlinear frequency rapid control mode was proposed. The simulation model is built for verification, and the results show that the pre-stage converter can generate a stable DC bus voltage and realize the PFC function, and the post-stage converter can realize soft switching in the full load range, which effectively improves the system efficiency. A 3.3 kW two-stage on-board charging system experimental platform is built, and the experimental platform is tested under different load conditions. According to the experimental results, the overall system efficiency is consistently higher than 94.5%, and the efficiency above half-load is higher than 96.3%.