Author(s)

Longkai Zhang¹, Hongchong Wu¹, Chinghwa Cheng¹, Dongey Liu¹, Miinshyue Shiau^2*, Weidian Lai², Ziwei Zheng²

¹Department of Electronic Engineering, Feng Chia University, Taichung.
²Department of Electronic and Information Engineering, Xiamen City University, Xiamen, China.

In this study, a temperature-based current sharing strategy rather than equal sharing for loads was applied to promote the reliability of uninterruptible power systems (UPS). According to the temperature of each power supply module in a UPS, it would be better to reduce the output current ratio for a hotter supply module in the UPS. In this design, we implemented our regulation circuits by the UMC 0.25-μm CMOS technology with an input range from 3 V to 4.2 V and the regulated output at 1.1 V. The rated output current was 100 mA for each phase. We also employed a current-mode error-correction circuit to improve the current sharing performance based on the averaged current of each phase at the same temperature. According to our simulation results, the current sharing error can be restricted within ± 5% for the supply modules at the same temperature in our system.

Load Current Sharing, Uninterruptible Power Systems, UPS, Voltage Regulator, Temperature-Based Sharing

Zhang, L.K., Wu, H.C., Cheng, C., Liu, D., Shiau, M., Lai, W.D. and Zheng, Z.W. (2018) A Temperature-Based Hysteresis Buck Converter for Dynamic Current Sharing. Circuits and Systems, 9, 213-223. doi: 10.4236/cs.2018.912019.