Efficiency Optimization of Dual Active Bridge Converter Based on dV/dt Snubber Capacitors

Xu, Wei; Vetrivelan, Adithyan; Guo, Zhicheng; Yu, Ruiyang; Huang, Alex Q.

doi:10.1109/apec42165.2021.9487159

Efficiency Optimization of Dual Active Bridge Converter Based on dV/dt Snubber Capacitors

Conference · Mon Jun 14 00:00:00 EDT 2021 · 2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

DOI:https://doi.org/10.1109/apec42165.2021.9487159· OSTI ID:2229097

Xu, Wei ^[1]; Vetrivelan, Adithyan ^[2]; Guo, Zhicheng ^[2]; Yu, Ruiyang ^[2]; Huang, Alex Q. ^[2]

The University of Texas at Austin,Semiconductor Power Electronics Center (SPEC),Austin,Texas,USA; University of Texas at Austin
The University of Texas at Austin,Semiconductor Power Electronics Center (SPEC),Austin,Texas,USA

This paper presents a lossless regenerative dV/dt snubber circuit for PWM converters to achieve high-efficiency high power-density without significant cost and reliability penalties. The dV/dt snubber employs lossless capacitors for each MOSFET device in a converter to provide an additional path to store the switching energy during turn-off transient and decrease the actual turn-off loss of the MOSFET channel. A novel mathematical turn-off loss model is built to separate the actual turn-off loss of the MOSFET channel and the recycling switching energy stored in the total equivalent output capacitance including Coss, the dV/dt snubber, and etc. Necessary snubber optimization strategy is proposed in order to balance the turn-off loss with ZVS operation range and deadtime conduction loss, and thereby achieving an optimal efficiency performance. To prove the validity and accuracy of the novel turn-off loss model and optimization strategy, the dV/dt snubber has been incorporated into a 1.3kV/200kW DC/DC and a 1kV/70kVA DC/AC PWM converters. Experimental results are given to demonstrate the validity of the proposed dV/dt snubber capacitors and optimization strategy.

Research Organization:: University of Texas at Austin

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0008348

OSTI ID:: 2229097

Journal Information:: 2021 IEEE Applied Power Electronics Conference and Exposition (APEC), Journal Name: 2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

Country of Publication:: United States

Language:: English

References (11)

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