MULTIMODE CONSTANT FREQUENCY BIDIRECTIONAL ZVS CONTROL STRATEGY FOR NONINVERTING BUCK-BOOST CONVERTER

Jia Leilei; Sun Xiaofeng; Pan Yao; Wang Honglong; Wang Wubo; Li Xin

doi:10.19912/j.0254-0096.tynxb.2021-0688

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (12) : 520-530. DOI: 10.19912/j.0254-0096.tynxb.2021-0688

MULTIMODE CONSTANT FREQUENCY BIDIRECTIONAL ZVS CONTROL STRATEGY FOR NONINVERTING BUCK-BOOST CONVERTER

Jia Leilei^1,2, Sun Xiaofeng¹, Pan Yao¹, Wang Honglong¹, Wang Wubo¹, Li Xin¹

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Abstract

Noninverting Buck-Boost converters are widely used in renewable energy power generation systems, energy storage systems and other occasions with a wide voltage variation range. The conventional quadrangle control method can realize ZVS of all switches in noninverting Buck-Boost converter, but it has the following problems： 1） the large conduction loss caused by large inductor current; 2） the output voltage fluctuation caused by mode switching; 3） the use of lookup table and linear interpolation makes the calculation amount large and the overall control complex. The proposed multimode constant frequency ZVS control strategy solves the three problems. Firstly, without any additional active or passive components, by dividing the entire wide input voltage range into three modes, after independently analyzing the characteristics of each mode, the control conditions can be added to simplrfy the calculation process, and the online realtime closed-loop and minimum conduction loss ZVS of each mode can be realized at the same time. There is no need to use multi-dimensional lookup table and linear interpolation, and the overall control is simple and easy to achieve. Secondly, a multimode smooth switching control strategy is proposed, which can ensure that the output voltage is always stable before and after the duty cycle of each switch jumps during mode switching. Then, a multimode constant frequency ZVS constant current charging control strategy is proposed to realize bidirectional ZVS charging and discharging control of noninverting Buck-Boost converter. Finally, the theoretical basis for division of each mode and the calculation principle of inductor parameter is provided, and a 500 W experimental prototype is built to verify the effectiveness of the proposed scheme.

Key words

DC-DC converter / ZVS / phase shift / digital control system / mode switching / energy storage

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Jia Leilei, Sun Xiaofeng, Pan Yao, Wang Honglong, Wang Wubo, Li Xin. MULTIMODE CONSTANT FREQUENCY BIDIRECTIONAL ZVS CONTROL STRATEGY FOR NONINVERTING BUCK-BOOST CONVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(12): 520-530 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0688

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