VARIABLE FREQUENCY ZERO VOLTAGE SWITCHING CONTROL STRATEGY FOR FOUR-SWITCH BUCK-BOOST CONVERTER

Liu Shuxi; Deng Ruixiang; Guo Qiang

doi:10.19912/j.0254-0096.tynxb.2023-2165

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 210-219. DOI: 10.19912/j.0254-0096.tynxb.2023-2165

VARIABLE FREQUENCY ZERO VOLTAGE SWITCHING CONTROL STRATEGY FOR FOUR-SWITCH BUCK-BOOST CONVERTER

Liu Shuxi, Deng Ruixiang, Guo Qiang

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Abstract

The FSBB converter to achieve high efficiency, need by reducing the inductor current root mean square （RMS） and the conduction loss of power devices. It is found that the RMS of the inductor current can reach the minimum under the condition of light load, but can not be maintained under the condition of heavy load. For this, put forward a kind of FSBB converter low inductor current RMS control strategy, in order to satisfy the demands of overloading by a variable frequency ZVS control. At the same time, considering inductor current rate of similar input and output voltage is small, can optimize the selection of the time to limit variable frequency range that reduce the difficulty of the hardware design.An experimental prototype with an input voltage of 10-40 V and an output voltage of 15-35 V has been developed in the laboratory, and the feasibility and superiority of the proposed control strategy have been verified by experiments.

Key words

DC-DC converters / zero voltage switching / digital control system / four-switch Buck-Boost converter / quadrilateral inductor current

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Liu Shuxi, Deng Ruixiang, Guo Qiang. VARIABLE FREQUENCY ZERO VOLTAGE SWITCHING CONTROL STRATEGY FOR FOUR-SWITCH BUCK-BOOST CONVERTER[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 210-219 https://doi.org/10.19912/j.0254-0096.tynxb.2023-2165

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