RESEARCH ON THREE PORT LLC RESONANT CONVERTER

Zhang Yi; Xie Junfeng; Liu Feilong; Chen Yu

doi:10.19912/j.0254-0096.tynxb.2021-0213

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (2) : 113-119. DOI: 10.19912/j.0254-0096.tynxb.2021-0213

RESEARCH ON THREE PORT LLC RESONANT CONVERTER

Zhang Yi, Xie Junfeng, Liu Feilong, Chen Yu

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Abstract

The energy transmission of DC micro-grid needs cascaded converters. In order to solve the problem of energy loss caused by multiple converters, a three-port LLC resonant converter is proposed. The converter can supply energy to the load side and the energy storage side at the same time. The fundamental harmonic approach （FHA） is used to establish the model of the converter. The gain characteristics of the converter is analyzed. Traditional pulse width modulation can not realize wide range of zero voltage switching technology. The existing pulse frequency modulation control strategy needs complex modeling process. An improved PWM-PFM hybrid control strategy is proposed. The converter can realize the output voltage regulation and zero voltage switching in a wide input voltage range. Finally, the simulation model of 330-400 V input and 48 V/288 W output is established to illustrate the correctness of the research and analysis.

Key words

ZVS / LLC resonance / converter / wide range / PWM-PFM hybrid control / three ports

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Zhang Yi, Xie Junfeng, Liu Feilong, Chen Yu. RESEARCH ON THREE PORT LLC RESONANT CONVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(2): 113-119 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0213

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