并联热敏电阻对半导体桥换能元 直流响应的影响研究
基金项目:
国防科技重点实验室基金（No.6142603032107）；“叶企孙”科学基金（U2341249）。
Study on the Influence of Parallel Thermistor on the DC Response of Semiconductor Bridge Transducer
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摘要:并联热敏电阻是提升半导体桥（SCB）火工品临界熔断电流的有效措施。本研究利用恒流电源和红外测试系统，对不同直流激励条件下并联热敏电阻对半导体桥响应的影响进行了试验研究。试验测试了换能元桥区温度及临界熔断电流，结果表明，并联负温度系数（NTC）热敏电阻能显著提高SCB的临界熔断电流至原来的1倍以上，同时使桥区温度最大降低68%。经计算，NTC热敏电阻的分流效果范围为34.4% ~ 74.4%。本研究不仅验证了并联NTC热敏电阻对提高3Ω敏感型SCB火工品安全性的显著效果，而且为SCB火工品在复杂电磁环境下的应用提供了技术支撑。
Abstract:Parallel thermistor is an effective measure to raise the critical fusing current of semiconductor bridge (SCB) initiating explosive device. The effects of parallel thermistor on the response of SCB under different DC excitation conditions were studied by using the constant current power supply and an infrared testing system. The temperature and the critical fusing current in the bridge area were tested, and the results show that the negative temperature coefficient (NTC) thermistor can significantly increase the critical fusing current of SCB to more than 1 times the SCB without an NTC. Additionally, the bridge area temperature is reduced by up to 68%, the shunting effect of the NTC thermistor is calculated to be between 34.4% and 74.4%. This study not only confirms the significant effect of parallel NTC thermistor on improving the safety performance of 3 Ω sensitive SCB initiating explosive devices, but also provides technical support for the application of SCB initiating explosive devices in complex electromagnetic environments.
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