A Dual Path Hybrid Step-Up Converter with Enhanced Drive Voltage for Low Voltage Applications

2021 IEEE 14th International Conference on ASIC (ASICON) Pub Date : 2021-10-26 DOI:10.1109/ASICON52560.2021.9620306

Hailiang Xiong, Bingqing Zhao, Rui Yang, Zeya Xie, Shaowei Zhen, Dongming Ding, Bo Zhang

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Abstract

A novel dual path hybrid step-up (DPSU) converter is proposed in this paper. An inductor and a flying capacitor are adopted as power conversion elements. The proposed converter can produce a higher conversion ratio (CR) with the same duty cycle compared to conventional boost (CB) converter. The voltage stress of power devices is relieved in the DPSU converter and the average inductor current is also reduced leading to lower power loss caused by dc resistance (DCR) of inductor. Furthermore, a negative-voltage switching node is obtained by DPSU converter and a charge-sharing based bootstrap gate driver is designed. The bootstrap gate driver takes use of the negative-voltage switching node, which can enhance driving voltage even at low input voltage. Circuit design is therefore simplified and efficiency is further improved. Simulation results show when input voltage and load current is 2.7V and 1A respectively, the conversion efficiency of DPSU converter is 11.34% higher than that of CB converter.

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一种用于低压应用的具有增强驱动电压的双路径混合升压变换器

提出了一种新型的双路混合升压(DPSU)变换器。采用电感和飞行电容作为功率转换元件。与传统升压(CB)变换器相比，该变换器在相同占空比下可以产生更高的转换比(CR)。DPSU变换器减轻了功率器件的电压应力，减小了电感的平均电流，从而降低了电感的直流电阻(DCR)造成的功率损耗。在此基础上，利用DPSU变换器实现了负电压开关节点，并设计了基于电荷共享的自举栅驱动器。自举栅驱动器采用负电压开关节点，即使在低输入电压下也能提高驱动电压。因此简化了电路设计，进一步提高了效率。仿真结果表明，当输入电压为2.7V，负载电流为1A时，DPSU变换器的转换效率比CB变换器高11.34%。

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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2021 IEEE 14th International Conference on ASIC (ASICON)

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