학술논문
Common-Mode Current Analysis and Cancellation Technique for Dual Active Bridge Converter Based DC System
Document Type
Periodical
Author
Source
IEEE Transactions on Industry Applications IEEE Trans. on Ind. Applicat. Industry Applications, IEEE Transactions on. 58(4):4955-4966 Aug, 2022
Subject
Language
ISSN
0093-9994
1939-9367
1939-9367
Abstract
This article presents an active neutral point clamped (ANPC)-based parallel dual-active bridge (DAB) architecture which combines dv/dt cancellation and power sharing in order to reduce electromagnetic interference (EMI) caused by common-mode (CM) current. High dv/dt associated with wide bandgap devices causes high CM current mainly due to parasitic capacitances. The corresponding conducted EMI can remarkably reduce the reliability of power converters and other onboard systems. This issue becomes worse due to higher dc bus voltage trend in electric vehicles (EV) and other dc systems. Conventional techniques struggle to provide attenuation in a wide frequency range. The problem can also be severe in soft-switched DAB converters as they operate at relatively higher frequencies. In this article, initially, an in-depth theoretical analysis is provided to understand the complimentary dv/dt events. Various factors causing nonideal dv/dt cancellation are discussed in detail together with possible solutions. Detailed experimental results are obtained from a 1100 V–150 V parallel DAB system including both the high and low voltage sides at different dv/dt rates. dv/dt cancellation at lowered dv/dt rates facilitated by power sharing and small snubbers provide up to 25 dBuA reduction in CM conducted EMI. A comparison with CM chokes is also presented to validate improved attenuation in a wide frequency range.