Overvoltage and Oscillation Suppression Circuit With Switching Losses Optimization and Clamping Energy Feedback for SiC MOSFET
Overvoltage and Oscillation Suppression Circuit With Switching Losses Optimization and Clamping Energy Feedback for SiC MOSFET
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DOI：
10.1109/tpel.2021.3090031
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发表时间：
2021-12
影响因子：
6.7
通讯作者：
Chengzi Yang;Y. Pei;Laili Wang;Longyang Yu;Fan Zhang;B. Ferreira
中科院分区：
文献类型：
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作者：
Chengzi Yang;Y. Pei;Laili Wang;Longyang Yu;Fan Zhang;B. Ferreira
缓冲电路是一种有效的解决方案，以减少严重的关断过电压和振荡所造成的SiC MOSFET的快速开关特性。然而，在开关过程中，由于缓冲器使功率回路寄生电感倍增，导通开关损耗将显著增加。本文研究了功率回路寄生电感对SiC MOSFET开关特性的影响以及准零电压开关（QZVS）的开通条件。在此基础上，提出了一种既具有开关损耗优化特性又具有箝位能量反馈特性的SiC MOSFET过电压和振荡抑制电路（OVSC）。箝位电容能有效地抑制过电压和振荡，且在过电压出现之前，箝位电容不参与开关过程，与其他常用缓冲电路相比，有利于降低开关损耗。此外，钳位电容中储存的关断过电压和振荡能量可以通过能量反馈电感和二极管组成的无源分支反馈到直流侧和负载侧。实验研究和综合比较研究进行了验证所提出的OVSC的有效性。实验结果表明，OVSC具有良好的过电压和振荡抑制性能，并能显著降低开关损耗。
The snubber circuit is a cost-effective solution to reduce the severe turn-off overvoltage and oscillation caused by the fast switching characteristics of SiC MOSFET. However, the turn-on switching losses will significantly increase as the snubber decouples the power loop parasitic inductance during the switching process. In this article, the effect of the power loop parasitic inductance on the switch performance of SiC MOSFETs and the quasi-zero voltage switching (QZVS) turn-on condition are studied. On this basis, an SiC MOSFET overvoltage and oscillation suppression circuit (OVSC) with not only the switching losses optimization feature but also the clamping energy feedback characteristic is proposed. The overvoltage and oscillation can be effectively suppressed by clamping capacitors, and those capacitors do not participate in the switching process until the overvoltage occurs, which is of benefit to the switching losses reduction compared with the other normal snubber circuits. Besides, the turn-off overvoltage and oscillation energy stored in the clamping capacitors can be feedback to dc and load side through a passive branch composed of an energy feedback inductor and a diode. The experimental studies and comprehensive comparison studies are carried out to verify the validity of the proposed OVSC. The experimental results show that OVSC has excellent overvoltage and oscillation suppression performance and can significantly reduce the switching losses.