A Switchable Rectifier-based LLC Resonant Converter for Photovoltaic Applications
A Switchable Rectifier-based LLC Resonant Converter for Photovoltaic Applications
复制标题
用于光伏应用的基于可开关整流器的 LLC 谐振转换器
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
I. Batarseh
中科院分区：
文献类型：
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作者：
Fahad Alaql;Reza Rezaii;Sahin Gullu;M. Elrais;I. Batarseh
传统的LLC变换器在谐振DC-DC变换器中很受欢迎。然而，开关频率范围限制影响转换器在较宽电压范围下的操作。远开关频率远离谐振频率工作;获得的环流越高，总效率越低。本文提出了一种新型的LLC谐振变换器与开关整流器，可以调节光伏电池板的宽低压范围。该变换器采用原边全桥电路和副边三倍、五倍、六倍整流电路，构成一个拓扑结构，克服了传统LLC变换器的缺点。通过配置整流器结构并利用频率调制，电压增益在谐振频率附近的窄频率范围内扩展。此外，与传统LLC转换器相比，效率提高，并且Transformer的尺寸减小。此外，在所有功率MOSFET和功率二极管中实现零电压开关（ZVS）和零电流开关（ZCS）。搭建了一台250 W的宽输入电源输出500 V直流电的变换器样机，并进行了实验，验证了该变换器的可行性和有效性。
The conventional LLC converter is popular among the resonant DC-DC converters. However, the switching frequency range limitation affects the operation of the converter under a wider voltage range. The far switching frequency operates away from the resonant frequency; the higher the circulating currents and the lower the overall efficiency are obtained. This paper presents a novel LLC resonant converter with a switchable rectifier that can regulate the photovoltaic panel’s wide low voltage range. The full-bridge circuit on the primary side and a voltage-tripler rectifier, a voltage-fifthfolder rectifier, and a voltage-sixfolder rectifier on the secondary side are employed in a single topology to overcome the disadvantages of the conventional LLC converter. By configuring the rectifier structure and utilizing frequency modulation, the voltage gain is extended with a narrow frequency range around the resonant frequency. In addition, the efficiency is improved, and the size of the transformer is reduced compared to those of the conventional LLC converter. Moreover, zero voltage switching (ZVS) and zero current switching (ZCS) are achieved in all power MOSFETs and power diodes. A 250W converter prototype generating 500 V DC output from a wide-input source was built and tested to verify the proposed converter’s feasibility and effectiveness.