Voltage balancing method for series-connected power devices based on active clamping

被引：0
|
作者：
Shao S. [1 ]
Wang X. [1 ]
Zhang J. [1 ]
Chen H. [2 ]
Zhang J. [1 ]
机构：
[1] College of Electrical Engineering, Zhejiang University, Hangzhou
[2] School of Information and Electrical Engineering, Hangzhou City University, Hangzhou
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2024年 / 44卷 / 05期
基金：
中国国家自然科学基金;
关键词：
active clamping; DC transformer; dv/dt optimization; series-connected devices; voltage balancing;
D O I：
10.16081/j.epae.202307005
中图分类号：
学科分类号：
摘要：
The key technical challenge of series connection of power devices is the dynamic and static voltage balancing of series-connected devices. A voltage balancing circuit of series-connected power devices based on active clamping and its control method are proposed. This circuit consists of only one auxiliary switch and one clamping capacitor, which is connected in parallel with each main power switch. The turn off voltage of the main power switches can be clamped to the clamping capacitor voltage automatically, and the balancing of the series-connected power device voltages can be transferred into the balancing of the clamping capacitor voltages. A voltage balancing method for the clamping capacitors is proposed, which uses the negative current to recycle the electric energy from the clamping capacitor, and achieves the ZVS-on(zero voltage switching-on) of the auxiliary switch. The proposed voltage balancing method has the advantages of simple structure, low loss and modular structure. Besides, by adjusting the discharging period difference of the clamping capacitors, the staircase arm voltages can be generated to reduce the instantaneous change rate of the arm voltage dv/dt. A 3 kV/750 V 30 kW resonant DC transformer prototype is constructed, and 6 SiC MOSFETs are connected in series in each arm. Experimental results show that the proposed voltage balancing method can realize the dynamic and static voltage balancing of series-connected devices, the voltage unbalance degree is less than 3%, and the peak efficiency is up to 98.4% at 3 kV input voltage. © 2024 Electric Power Automation Equipment Press. All rights reserved.
引用
收藏
页码：164 / 170
页数：6
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