A Novel Phase-Shift Pulsewidth Modulation Method for Light-Load Bidirectional Resonant Converter
A Novel Phase-Shift Pulsewidth Modulation Method for Light-Load Bidirectional Resonant Converter
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DOI：
10.1109/tpel.2022.3217104
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发表时间：
2023-03
影响因子：
6.7
通讯作者：
Yuzhen Xu;Xiangyang Dai;Zhongyi Zhang;Zhiwei Kang;Tao Jin
中科院分区：
文献类型：
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作者：
Yuzhen Xu;Xiangyang Dai;Zhongyi Zhang;Zhiwei Kang;Tao Jin
对于双向全桥CLLC谐振变换器来说，一次侧和二次侧开关的软开关和双向功率传输是其明显的优点。然而，在轻负载条件下的脉冲调频控制中，变换器存在输出电压不平衡、传输效率低等缺点。为了提高CLLC谐振变换器在轻负载条件下的调压范围和效率，提出了一种新的移相脉宽调制方法。具有低电压增益调节，在轻负载下可实现低运行损耗。考虑到开关的寄生参数和死区时间，采用时域分析方法对该控制方法在轻负载下的电压增益进行了精确研究。最后，设计了一个输入电压为200v，输出电压为200v，额定功率为800w的双向全桥CLLC谐振变换器的实验样机。仿真和实验结果表明，该控制方法在轻负荷工况下是有效的。
For the bidirectional full-bridge CLLC resonant converter, soft switching of primary side and secondary side switches and bidirectional power transmission are its obvious advantages. However, in the pulse frequency modulation control under light-load conditions, the converter will have the disadvantages of output voltage imbalance and low transmission efficiency. In order to improve the range of voltage regulation and efficiency of CLLC resonant converter under light-load conditions, a novel phase-shift pulsewidth modulation method is proposed in this article. There is low voltage gain regulation and low operation losses can be achieved under light load. Considering the parasitic parameters and dead time of the switches, the voltage gain of the proposed control method under light load is precise research by using the time domain analysis method. Finally, an experimental prototype of a bidirectional full-bridge CLLC resonant converter with 200 V input voltage, 200 V output voltage, and a rated power of 800 W is designed. According to the simulation and experimental results, it can be shown that the proposed control method is effective under light-load operation.