用于宽输入电压范围应用的半桥LLC变换器

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) Pub Date : 2018-11-01 DOI:10.1109/PEAC.2018.8590334

Xiao-guang Jin, X. Zhou, Wubin Wang, Zhen Ma, Jun Xu, Zheng-yu Lu

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引用次数: 0

摘要

提出了一种改进的带磁放大器辅助后稳压器的半桥LLC变换器。当变换器在低输入电压范围内工作时，磁放大器的功能被绕过，而当输入电压高时，它作为辅助后稳压器工作。通过改变磁放大器的阻塞时间，可以相应延长变换器的直流增益。从而扩大了变换器的输入电压范围。分析了磁放大器的广义工作原理，提出了磁放大器的设计准则。最后，搭建了输出25V、输出400W的实验样机，并在160 ~ 300v的输入电压范围内进行了测试，验证了所提方法的可行性。

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A Half-Bridge LLC Converter for Wide Input Voltage Range Applications

An improved half-bridge LLC converter with magamp auxiliary post-regulator is proposed in this paper. The function of magamp is bypassed when the converter works within low input-voltage range, whereas it operates as an auxiliary post-regulator when the input-voltage is high. By changing the magamp’s blocking time, the dc gain of the converter can be extended accordingly. Hence, the input-voltage range of the converter is extended. The generalized operational principle is analyzed and the design criterion for the magamp is presented. Finally, a 25V output, 400W experimental prototype was built and tested for a 160–300V input-voltage range to verify the feasibility of the proposed method.

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2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)

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