A bidirectional four-switch buck-boost (FSBB) converter offers more control variables than a classical buck-boost converter and can thus achieve higher power efficiencies through appropriate control. Traditionally, efficiency is optimized by reducing the inductor current rms value (or conduction loss) obtained through time-domain analysis. However, it is extremely difficult to use this time-domain approach to include converter switching losses in the efficiency optimization for all possible modulation modes. To solve this problem, this article proposes a frequency-domain analysis to estimate switching losses and establish a comprehensive loss model that allows for the efficiency to be optimized using a Gaussian quantum-behaved particle swarm optimization (GQPSO) algorithm. The switching frequency is then used as an additional optimization variable to improve the efficiency over a much wider range of operating conditions. The proposed method is verified experimentally, using 600 and 1500 W rated laboratory prototypes, and compared with existing methods. Results demonstrate the effectiveness of the proposed technique in increasing converter efficiency over the whole range of load conditions.
Efficiency Optimization of Four-Switch Buck-Boost Converter Using Frequency-Domain Analysis
IEEE Transactions on Transportation Electrification ; 11 , 1 ; 2717-2731
2025-02-01
3512691 byte
Article (Journal)
Electronic Resource
English
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