基于CLLLC变频扩展移相分段调制的宽增益车载充电机研究

doi:10.19595/j.cnki.1000-6753.tces.241310

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Abstract In recent years, the market share of electric vehicles has been expanding. The development of on-board charger (OBC) provides an efficient, convenient and safe charging solution for electric vehicles. With the improvement of charging technology and the increase of vehicle battery capacity, the optimal design of OBC has become an important link in the electric vehicle industry chain. Aiming at the four major challenges of OBC technology: high power density, high efficiency, wide voltage gain, and multi-function, this paper focuses on the key issue of “wide voltage gain”, and explores how to achieve a wider voltage gain range to improve charging efficiency and flexibility.
Based on the comparison and analysis of the existing OBC topologies and its functional characteristics, this paper investigates a new bidirectional two-stage isolated topology, including a front-end bidirectional AC-DC converter and a back-end bidirectional DC-DC converter. The front stage is composed of a single-phase PWM rectifier and a Sepic-Zeta DC-DC converter, and the back stage is a bidirectional CLLLC resonant converter. The proposed topology can effectively adapt to the charging requirements under different battery voltage levels while ensuring bidirectional energy flow. The following section will focus on the analysis of the back-end bidirectional CLLLC resonant converter. As a critical component of the overall topology, the design of this converter is aimed at ensuring high-efficiency power conversion across a wide range of loads.
The bidirectional CLLLC converter can achieve high-efficiency power conversion over a wide range of loads. The voltage gain model of the CLLLC resonant converter, established using the fundamental harmonic approximation (FHA) method, can be utilized to analyze the characteristics or design parameters of the CLLLC resonant converter. Based on the gain characteristic curves, the impact of the DC bus voltage on the operating point is analyzed. Consequently, by adopting variable DC bus voltage control, the range of switching frequency variation can be significantly reduced while ensuring a wide range of output voltages. To address the issues of low efficiency in buck-type with pulse frequency modulation (PFM) and high return power and narrow gain in single phase shift (SPS) modulation in the bidirectional CLLLC resonant converter, a segmented hybrid modulation strategy combining “Frequency conversion+Extended Phase Shift” has been investigated. When M≥1, PFM is employed to control the output power efficiently, while extended phase shift (EPS) modulation is utilized when M<1. The conditions for achieving zero-voltage switching (ZVS) under EPS modulation are analyzed. Combined with the variable DC bus voltage control strategy, this approach significantly reduces the range of switching frequency variation, extends the output voltage range, and achieves the objectives of wide voltage gain and high-efficiency control.
Finally, the proposed topology and control strategy were simulated and verified in Matlab/Simulink software, and the software and hardware design of OBC were completed. Based on the STM32H750VBT6 controller, a 6.6 kW OBC experimental platform was built for experimental verification. From the experimental results, it is evident that the control strategy exhibits strong robustness against disturbances, achieving a wide output voltage range from 250 V to 750 V. Both forward and reverse operations enable soft switching across the entire gain range, meeting the anticipated control objectives. The segmented hybrid modulation strategy further enhances the overall efficiency of the system.

Key words： On-board charger bidirectional CLLLC resonant converter pulse frequency modulation extended phase shift modulation

Received: 22 July 2024

PACS:

TM46

Fund:国家自然科学基金资助项目（51577155）

Corresponding Authors: 郭俊玲女,1999年生,硕士研究生,研究方向为电力电子与电力传动。E-mail: 17378588556@163.com

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Wang Jianyuan,Guo Junling,Yan Jin等. Research on Wide Gain Vehicle Charger Based on CLLLC Frequency Conversion Extended Phase Shift Segment Modulation[J]. Transactions of China Electrotechnical Society, 2025, 40(18): 5998-6013.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.241310 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I18/5998

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