Analysis and Design of an Intrinsically Safe Buck-Boost Converter on Considering of the Filter Capacitor with Equivalent Series Resistance
Huang Jinfeng1, Li Linhong1, Ren Shuxin1, Liu Shulin2
1. School of Electrical Engineering Shaanxi University of Technology Hanzhong 723001 China; 2. School of Electrical and Control Engineering Xi'an University of Science & Technology Xi'an 710054 China;
Abstract：The Buck-Boost converter used in coal mine, petrochemical and other dangerous environment should not only meet the requirements of intrinsic safety, but also meet the requirements of electrical performance indicators such as ripple voltage. The parameter design basis of the existing intrinsic safety switching converter is the ideal ripple voltage expression. However, due to the influence of parasitic parameters such as equivalent series resistance (ESR), the capacitor designed according to the ideal formula cannot meet the ripple voltage requirements, and a margin of 2~4 times is usually selected. This will increase the risk of explosion when the converter is short-circuited. Capacitor ESR not only causes the ripple voltage waveform distortion, but also has an important impact on the ripple voltage. In order to better guide the parameter design of intrinsically safe buck boost converter, the mechanism of ripple voltage distortion caused by capacitor ESR is analyzed, and the accurate mathematical model of ripple voltage and the peak inductance of Buck-Boost converter considering capacitor ESR are established. Then, the parameter design method of intrinsically safe Buck-Boost converter is proposed in the dynamic range of input voltage, load resistance and capacitance ESR. The experimental results show that the ripple voltage and output intrinsic safety requirements of Buck- Boost converter can be satisfied by selecting a capacitor with the margin of 1.2 times, which can effectively improve the intrinsic safety performance of the converter.
皇金锋, 李林鸿, 任舒欣, 刘树林. 考虑滤波电容等效串联电阻的输出本质安全型Buck-Boost变换器分析与设计[J]. 电工技术学报, 2021, 36(8): 1658-1670.
Huang Jinfeng, Li Linhong, Ren Shuxin, Liu Shulin. Analysis and Design of an Intrinsically Safe Buck-Boost Converter on Considering of the Filter Capacitor with Equivalent Series Resistance. Transactions of China Electrotechnical Society, 2021, 36(8): 1658-1670.
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2021, Vol. 36 
