A Hybrid Half-bridge LLC Resonant Converter and Phase Shifted Full-bridge Converter for High Step-up Application

Yuqi Wei, Quanming Luo, A. Mantooth
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引用次数: 11

Abstract

High step-up DC/DC converters are popular in renewable energy generation systems, like photovoltaic (PV) and fuel cell. To achieve high step-up conversion ratio, in this paper, an input-parallel and output-series hybrid topology of half-bridge LLC resonant converter and phase shifted full-bridge converter (PSFB) is proposed. The following features have been achieved: 1) high voltage conversion ratio: due to the output series connection, the system voltage conversion ratio equals to the sum of LLC resonant converter and PSFB converter. In addition, the voltage doubler rectifier is adopted for the LLC resonant converter to further increase the voltage gain; 2) LLC resonant converter is operating at the series resonant frequency operating point, its voltage conversion ratio is constant and independent of the load, and the high efficiency conversion is achieved; 3) function decoupling idea is adopted for the proposed topology, most of the power is handled by the high efficiency conversion unit-LLC resonant converter, while the PSFB unit is used to regulate the output voltage; 4) since both two converter units are isolated DC/DC converter, fully isolation between the input voltage and output voltage is achieved. Operational principles, design considerations, and experimental validation are presented.
用于高升压应用的混合半桥LLC谐振变换器和相移全桥变换器
高升压DC/DC变换器在可再生能源发电系统中很受欢迎,如光伏(PV)和燃料电池。为了实现高升压转换率,本文提出了半桥LLC谐振变换器和移相全桥变换器(PSFB)的输入并联输出串联混合拓扑结构。实现了以下特点:1)电压转换率高:由于输出串联,系统电压转换率等于LLC谐振变换器和PSFB变换器之和。此外,LLC谐振变换器采用倍压整流器,进一步提高了电压增益;2) LLC谐振变换器工作在串联谐振频率工作点,其电压变化率恒定且不受负载影响,实现了高效率转换;3)所提出的拓扑结构采用函数解耦思想,大部分功率由高效率转换单元- llc谐振变换器处理,而PSFB单元用于调节输出电压;4)由于两个变换器单元都是隔离的DC/DC变换器,因此在输入电压和输出电压之间实现了完全隔离。介绍了工作原理、设计注意事项和实验验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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