Inner Intrinsically Safe Criterion and Design Considerations of Buck Converter Based on Equivalent Inductance |
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| Authors: | Shulin Liu Hao Wu Chaoying Wang Shen Nie Lili Qi |
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| Affiliation: | 1. School of Electrical and Control Engineering, Xi’an University of Science and Technology, China;2. School of Communication and Information Engineering, Xi’an University of Science and Technology, China |
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| Abstract: | To obtain the intrinsic safety criterion of the Inner-intrinsic-Safety-Buck-Converter (ISBC) based on equivalent-inductance to guide its optimal design, the Inductor Disconnected Discharge (IDD) behavior of ISBC is researched, and the Equivalent-Simple-Inductive-Circuit (ESIC) based on the equivalent inductance is defined. According to ESIC based on the equivalent-current and the energy equivalence, the expression of the equivalent inductance Lei is derived. The effect of the inductance L, the capacitance C, the input voltage Vi and the load resistance RL on Lei is deeply studied, and it’s pointed out that Lei increases with the increase of Vi, L, C, and RL, respectively. According to the minimal ignition current curve of the Simple-Inductive-Circuit (SIC), the nonexplosive intrinsically safe criterion based on Lei is proposed. Combining the proposed criterion, the output ripple voltage and the expression of Lei, the design region of the capacitance and inductance of the Buck converter meeting the demands of both inner intrinsic safety and electric performance is obtained. The feasibility of the design method and the proposed criterion is proved by the simulation and experimental results. |
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| Keywords: | buck converter inner intrinsically safe criterion equivalent inductance design method |
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