A LLC resonant converter with a notch filter at secondary side for high step-up and wide voltage range applications

2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC) Pub Date : 2015-12-21 DOI:10.1109/IFEEC.2015.7361402

Xiang Jin, Haibing Hu, Hongfei Wu, Xudong Ma

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引用次数: 4

Abstract

A multi-resonant converter is proposed by embedding a notch filter at secondary side in the conventional LLC converter for both high step-up and wide voltage range applications. Compared to LLC converter, the proposed converter can achieve wide voltage regulation within relatively narrow switching frequency range, and also the proposed resonant tank can effectively transfer both fundamental and third harmonics elements, resulting in high conversion efficiency. By moving the LC notch filter of the LCLCL converter to the secondary side, the proposed converter avoids the circulating currents at primary side flowing through LC notch filter, which benefits to reducing conduction losses. The operation principles and characteristics are analyzed in detail using first harmonic approximation. A 400W prototype with input voltage range from 25V to 50V was built, and experimental results show overall efficiency of the proposed converter is 1.5% higher than LCLCL converter, which indicates the feasibility of the proposed converter in high step-up and wide voltage range applications.

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一种二阶侧带陷波滤波器的LLC谐振变换器，适用于高升压和宽电压范围应用

提出了一种多谐振变换器，在传统LLC变换器的二次侧嵌入陷波滤波器，适用于高升压和宽电压范围。与LLC变换器相比，该变换器可以在较窄的开关频率范围内实现较宽的电压调节，并且谐振槽可以有效地传递基次和三次谐波，从而提高了转换效率。通过将LCLCL变换器的LC陷波滤波器移至二次侧，避免了一次侧的循环电流流经LC陷波滤波器，有利于降低导通损耗。利用一次谐波近似法详细分析了其工作原理和特点。建立了输入电压范围为25V ~ 50V的400W样机，实验结果表明，该变换器的总效率比LCLCL变换器提高1.5%，表明了该变换器在高升压、宽电压范围应用中的可行性。

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2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC)

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