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Variable-Switching Constant-Sampling Frequency Critical Soft Switching MPC for DC/DC Converters.

Authors :
Zhou, Liwei
Preindl, Matthias
Source :
IEEE Transactions on Energy Conversion; Jun2021, Vol. 36 Issue 2, p1548-1561, 14p
Publication Year :
2021

Abstract

A variable-switching constant-sampling frequency critical soft switching model predictive control (VSCS-MPC) method is proposed in this paper to improve the dynamic behavior, efficiency and power density of the DC/DC power converters. Firstly, this paper analyzes the boundary constraints of critical soft switching that are derived with the key parameters of the interlock time and threshold current for typical SiC and GaN devices. Then, the VSCS-MPC method is proposed for synchronous DC/DC converter. Both the current source load and resistive load converters are validated with the proposed MPC method. VSCS-MPC includes two controlling parts. First is the frequency controller to maintain the critical soft switching operation by adjusting the switching frequency based on the pre-defined boundary conditions with a constant sampling frequency. A discretized frequency controller is developed to improve the stability of the system by maintaining a fixed sampling frequency. Second part is the model predictive controller to track the output voltage/current and maintain critical soft switching during dynamic periods. The explicit optimization and oversampling methods are applied in the MPC controller to meet the high frequency demand. A large current ripple ($\triangle i_L$ $\ge$ 200 %) is introduced to achieve the critical soft switching and reduce the inductance. The switching losses are decreased by the frequency controller and the critical soft switching is maintained especially in dynamic periods due to the fast response of MPC. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
08858969
Volume :
36
Issue :
2
Database :
Complementary Index
Journal :
IEEE Transactions on Energy Conversion
Publication Type :
Academic Journal
Accession number :
150449370
Full Text :
https://doi.org/10.1109/TEC.2021.3058306