从功率传输的路径出发,提出一种低应力的能量前馈型软开关Buck变换器,谐振能量通过高频变压器直接传输到负载侧,而非返回电源或间接传输至负载,以此来减小谐振能量的环流导通损耗。辅助软开关网络由一个开关管、两个二极管以及一个高频变压器组成,包括辅助网络在内的所有开关管和二极管均能完成软开关工作,同时不会增大原功率电路器件的电压电流应力。首先详细分析所提方案的软开关工作原理,接着对关键参数进行理论分析和仿真验证,最后构建一台开关频率为200 kHz、输出功率为200 W的实验样机。实验结果表明,在10%到额定负载范围内,所有开关器件均能完成软开关工作,与传统的硬开关Buck变换器进行效率对比,软开关Buck在整个负载测试范围内均具有更高的效率,轻载时尤为明显,满载时的效率从93.68%提升到96.53%。
Abstract
This paper proposes a low-stress energy feedforward soft-switching Buck converter from the perspective of the power transmission path. The resonant energy is directly transferred to the load side through a high-frequency transformer, rather than being returned to the power source or indirectly delivered to the load, thereby reducing conduction losses caused by resonant energy circulation. The auxiliary soft-switching network consists of one switching device, two diodes, and a high-frequency transformer. All switching devices and diodes, including those in the auxiliary network, achieve soft-switching operation without increasing the voltage or current stress on the original power circuit components. First, the soft-switching operating principles of the proposed scheme are analyzed in detail. Then, theoretical analysis and simulation verification of key parameters are conducted. Finally, a 200 kHz, 200 W experimental prototype is constructed. Test results demonstrate that all switching devices achieve soft-switching operation within a load range of 10% to full load. Compared with a conventional hard-switching Buck converter, the proposed soft-switching Buck exhibits higher efficiency across the entire load range, particularly under light-load conditions. The full-load efficiency improves from 93.68% to 96.53%.
关键词
Buck变换器 /
零电流开关 /
零电压开关 /
能量前馈 /
低应力
Key words
Buck converter /
zero-current switching /
zero-voltage switching /
energy feedforward /
low stress
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基金
福建省自然科学基金（2022J011257）; 厦门市自然科学基金（3502Z20227216）; 国家自然科学基金（52377188）
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