Discrimination research on internal intrinsic safety performance evaluation of buck converter
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摘要: 为了建立起Buck变换器内部本质安全性能评价的相关判别式，首先以简单电感电路的电弧放电为研究对象，基于热引燃理论，采用持续发热点热源温度场模型，将初始燃烧容积的温度由最高值下降至气体混合物燃烧温度的时间是否大于化学反应的时间作为判断火花能否成功引燃气体混合物的临界条件，得到了相应的火花放电时间临界值的表达式。然后，基于爆炸性试验数据对采用等效电阻法和放电电流线性模型算得的Buck变换器电感开路电弧放电能量表达式进行了修正，进而建立了Buck变换器内部本质安全性能评价的能量判别式和放电时间判别式。验证结果表明了所求放电时间临界值的合理性和所建立判别式的正确性。Abstract: This paper presents the study of establishing the relevant discriminants of the internal intrinsic safety performance evaluation of Buck converter. Firstly, the arc discharge of a simple inductor circuit was taken as the research object. Based on the thermal ignition theory, the temperature field model of the continuous heat point heat source was adopted, and the spark discharge time threshold expression used to determine whether the spark can successfully ignite the gas mixture was obtained, which was based on the condition that whether the time interval that the initial combustion volume decreases from the highest value to the combustion temperature of the gas mixture is longer than the time of the chemical reaction. Secondly, based on the explosive test data, the expression of the inductive open arc discharge energy of Buck converter calculated by the equivalent resistance method and the discharge current linear model was corrected. Furthermore, the energy discriminant and discharge time discriminant of the intrinsic safety performance evaluation of the Buck converter were established. The verification results show the rationality of the critical value of the discharge time and the correctness of the established discriminants.
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Key words:
- intrinsic safety /
- thermal ignition /
- discharge time /
- threshold /
- buck converter /
- discriminant
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图 1 不同放电时间下气体混合物温度与距热源中心距离的关系
Figure 1. Relationship between temperature of gas mixture and distance from heat source center under different discharge time
表 1 Buck变换器临界引燃状态相关数据
Table 1. Related data of Buck converter in critical ignition state
L/μH C/μF WB/mJ WA/mJ β= WA/WB 600 15.00 0.73 3.6 3.55 700 13.00 0.71 3.1 3.24 800 11.00 0.69 2.7 2.90 900 9.60 0.67 2.4 2.68 1000 8.65 0.66 2.3 2.59 1100 7.65 0.69 2.1 2.34 1200 7.10 0.63 2.0 2.38 1300 6.60 0.62 1.9 2.42 1400 6.10 0.61 1.8 2.30 1500 5.90 0.60 1.8 2.33 1600 5.65 0.59 2.0 2.36 2000 5.00 0.57 1.7 2.28 
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