An Improved Three-Mode Variable Frequency Control Strategy Based on Four-Switch Buck-Boost Converter
Fang Tianzhi1, Wang Yuan1, Zhang Huili1, Zhang Yu1, Sheng Shuheng1, Lan Jianyu2
1. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China;
2. State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-Sources Shanghai 200240 China
The four-switch Buck-Boost converter has the advantages of fewer passive components, low voltage stress of switches, the same polarity of input voltage and output voltage, and more freedom of control. And it is very suitable for pre-regulators with wide input voltage. In this paper, an improved three-mode control strategy is proposed to optimize the intermediate mode of the traditional three-mode control, which can reduce the conduction loss and improve the efficiency of FSBB. To further increase power density and reduce the switching loss and electromagnetic interference caused by high-frequency hard switching, this paper proposes a variable frequency control strategy to achieve soft switching in the full voltage range. Analysis shows that the improved three-mode control can optimize the frequency conversion range, so it has a good fit with the variable frequency soft switching control. A prototype with input 80~160V and output 125V/300W was developed in the laboratory to verify the correctness of the proposed control strategy. Through efficiency comparison and loss analysis, it is proved that the proposed control strategy is beneficial to FSBB to achieve high efficiency and high power density.
方天治, 王愿, 张惠丽, 张雨, 沈姝衡, 蓝建宇. 四管Buck-Boost变换器的改进型三模式变频软开关控制策略[J]. 电工技术学报, 2021, 36(21): 4544-4557.
Fang Tianzhi, Wang Yuan, Zhang Huili, Zhang Yu, Sheng Shuheng, Lan Jianyu. An Improved Three-Mode Variable Frequency Control Strategy Based on Four-Switch Buck-Boost Converter. Transactions of China Electrotechnical Society, 2021, 36(21): 4544-4557.
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2021, Vol. 36 
