Temperature Characteristic Analysis of the Output Intrinsically Safe Buck Converter and Its Design Consideration

Yan Li (), Shulin Liu, Zhenqin Liang, Yuqing Zhang and Yijun Shen
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Yan Li: School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
Shulin Liu: School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
Zhenqin Liang: School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
Yuqing Zhang: School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054, China
Yijun Shen: School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054, China

Energies, 2022, vol. 15, issue 19, 1-13

Abstract: Aiming at the unreliability resulting from ignoring the temperature effect and randomness of switching frequency in the traditional design method of an intrinsically safe Buck converter, a reliable design method based on the minimum frequency and considering the temperature characteristic is proposed. The theoretical design range of capacitance is deduced according to the maximum output ripple voltage and output intrinsic safety performance requirements. Considering the temperature characteristics of the capacitor, the actual maximum and minimum capacitances are obtained corresponding to the theoretical design capacitance within a given temperature range. It is pointed out that the actual minimum capacitance increases with the decrease of switching frequency, while the actual maximum capacitance is independent of frequency. Therefore, it can be deduced that there exists a minimum frequency which can meet the requirements of both output ripple voltage and intrinsically safe performance. When the actual maximum capacitance equals the actual minimum capacitance, the analytic expression of the minimum frequency is obtained. Assuming a capacitance adjustment, the actual working frequency of the converter corresponding to the minimum frequency is deduced. The design flow of an intrinsically safe Buck converter based on the minimum switching frequency considering the temperature characteristic is presented. The correctness of the theoretical analysis and the feasibility of the proposed design method are verified by experimental results. This design method can also be applied to other types of intrinsically safe converters.

Keywords: buck converter; output intrinsically safe; the minimum frequency; temperature characteristic (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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