| 引用本文: | 袁义生,彭能,刘伟.一种L-R复合型桥式DC/DC变换器[J].电力自动化设备,2022,42(9): |
| YUAN Yisheng,PENG Neng,LIU Wei.L-R hybrid bridge DC/DC converter[J].Electric Power Automation Equipment,2022,42(9): |
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| 摘要: |
| 提出了一种L-R复合型桥式DC/DC变换器。该变换器在传统半桥LLC谐振变换器的基础上，仅增加一组L桥臂，有高、低2种电压增益模式。在高电压增益模式，采用脉冲宽度调制，通过L桥臂对电感线性储能，获得了比传统LLC谐振变换器更高的电压增益，具有更宽的输出电压范围，且电压增益受励磁电感影响小，电路工作无回馈电流。在低电压增益模式，采用脉冲频率调制，电压增益特性与传统LLC谐振变换器接近，但有更小的回馈电流和循环电流。详细分析了所提拓扑2种电压增益模式的工作原理，推导出增益公式，并与传统拓扑进行对比。最后搭建了一台输入电压为220 V、输出电压为100~160 V的实验样机，实验结果验证了理论分析的正确性。 |
| 关键词: DC/DC变换器 谐振 复合 高电压增益 宽范围输出 |
| DOI：10.16081/j.epae.202205026 |
| 分类号:TM46 |
| 基金项目:国家自然科学基金资助项目(52067007) |
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| L-R hybrid bridge DC/DC converter |
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YUAN Yisheng, PENG Neng, LIU Wei
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School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang 330013, China
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| Abstract: |
| An L-R hybrid bridge DC/DC converter is proposed. Based on the traditional half-bridge LLC resonant converter, the proposed converter only adds a group of L-bridge arms and has HG(High voltage Gain) and LG(Low voltage Gain) modes. In HG mode, PWM(Pulse Width Modulation) is used and the linear energy storage of inductor is achieved through L-bridge arm, so as to obtain higher voltage gain and wider output voltage range compared with traditional LLC resonant converter. The voltage gain is less affected by excitation inductor, and the circuit works without feedback current. In LG mode, PFM(Pulse Frequency Modulation) is adopted, and the voltage gain characteristic is close to that of traditional LLC resonant converter, while the feedback current and circulating current are smaller. The working principles of the two voltage gain modes of the proposed topology are analyzed in detail, and the gain formula is derived and compared with traditional topology. Finally, an experimental prototype with an input voltage of 220 V and an output voltage of 100~160 V is built, and the experimental results verify the correctness of theoretical analysis. |
| Key words: DC/DC converter resonance hybrid high voltage gain wide range output |
