Bidirectional DC-DC converter with high step-down and step-up voltage conversion ratio

2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) Pub Date : 2016-12-01 DOI:10.1109/SPEC.2016.7846082

Shu-Hung Liao, J. Teng, Siwei Chen

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引用次数: 10

Abstract

A bidirectional DC-DC converter with high step-down and step-up voltage conversion ratio is proposed in this paper. Two capacitors series in the high-voltage side of proposed converter are used for voltage division. The divided voltages are then discharged to and charged from the low-voltage side by a modified two-phase interleaved buck-boost converter, respectively. Due to stacking architecture of the proposed converter, high bidirectional voltage conversion ratio with low voltage stresses on power switches can be achieved by the proposed converter with reasonable duty ratio. Besides, a smart phase-rotating control scheme can be integrated into the proposed converter to improve the conversion efficiency at light loads. A prototype circuit with a voltage of 200V in high-voltage side, a voltage of 24V in low-voltage side and a rated output power of 500W is implemented to verify the performance of proposed bidirectional DC-DC converter. Experimental results show that the maximum conversion efficiencies, about 93.40% and 93.86%, for step-down mode and step-up mode, respectively along with lower voltage stresses on power switches can be achieved. Besides, a conversion efficiency improvement of 5.42% can be accomplished for the proposed converter with smart phase-rotating control scheme under 25W.

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双向DC-DC变换器，具有高降压和升压转换比

本文提出了一种具有高降压和升压转换比的双向DC-DC变换器。转换器高压侧的两个电容器串联用于分压。然后，通过改进的两相交错降压-升压转换器，分别将分离的电压放电到低压侧和从低压侧充电。由于本文提出的变换器采用堆叠结构，合理占空比的变换器可以实现高的双向电压转换比和低的电源开关电压应力。此外，还可以将智能转相控制方案集成到该变换器中，以提高轻负载下的转换效率。为了验证所提出的双向DC-DC变换器的性能，设计了高压侧电压为200V，低压侧电压为24V，额定输出功率为500W的原型电路。实验结果表明，降压模式和升压模式的转换效率最高，分别为93.40%和93.86%，并且功率开关上的电压应力较低。在25W功率下，采用智能转相控制方案的变换器转换效率提高了5.42%。

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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2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)

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