具有热保护功能的限流启动电路设计
Design of current limiting starting circuit with thermal protection function
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摘要: 针对矿用本质安全型设备电路存在短路失效,限流启动电路芯片表面温度急剧增加,进而导致设备启动电路失效,器件表面温度过高带来安全风险等问题,介绍了一种基于热敏电阻的启动保护电路,给出了电路原理,分析了电路的工作特性,同时对非连续介质开展了热传导分析设计。经过温度保护电路的工作性能测试和非连续介质的热传导性能测试,验证了电路的有效性和可靠性。
Abstract: The circuit of mine intrinsically safe equipment has the risk of short-circuit failure, the chip surface temperature in current-limiting start circuit rises sharply, and the excessively high surface temperature of device leads to the failure of the startup circuit and the risk of safety. Aiming at these problems, this paper introduces the design of a startup protection circuit based on thermistor, gives the circuit principle, analyzes the working characteristics of the circuit, and carries out the heat transfer analysis and design of discontinuous medium. The working performance test of the temperature protection circuit and the heat transfer performance test of the discontinuous medium verify the validity and reliability of the circuit.
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