Research on the Ignition Performance of High Insensitive Semiconductor Bridge

doi:10.3969/j.issn.1000-1093.2019.05.007

Abstract

Abstract: A negative temperature coefficient (NTC)-semiconductor bridge (SCB) was prepared to improve the safety of SCB explosive initiator by paralleling a NTC thermistor to SCB, which is able to meet the requirement of high insensitiveness in 1.5 A and maximum 2.0 A non-firing stimuli tests. The split ratios at 1.0 A and 1.5 A after paralleling NTC thermistor to SCB were analyzed. Capacitance discharge ignition test, constant current excitation test and ignition sensitivity test were made to study the ignition performances of SCB, NTC-SCB and NTC-SCB after 1.5 A, 2.25 W and 5 min safe current test. Results show that the split ratios of NTC thermistor are about 35% and 62%， and thermal equilibrium temperatures are about 112 ℃ and 170 ℃ in 1.0 A, 1.00 W and 5 min, and 1.5 A, 2.25 W and 5 min safe current test, respectively. The ignition time and critical ignition energy are not show significant changes at 33 μF/30 V, but significantly increase at 7.0 A due to slow energy input rate and NTC thermistor shunt. Furthermore, 99.9% firing current of NTC-SCB increases from 2.329 A to 3.709 A after paralleling NTC thermistor and further increases from 3.709 A to 4.285 A after 1.5 A, 2.25 W and 5 min safe current test, which can be applied to the devices with ignition current greater than 5.571 A. Key

Key words: semiconductorbridge, explosiveinitiator, highinsensitivity, thermistor, ignitionperformance

CLC Number:

TJ45⁺9

ZHENG Zilong, ZHANG Wenchao, QIN Zhichun, WU Ganggang, YU Chunpei, WANG Jiaxin, CHEN Yajie, YE Jiahai, TIAN Guirong. Research on the Ignition Performance of High Insensitive Semiconductor Bridge[J]. Acta Armamentarii, 2019, 40(5): 954-961.

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第40卷第5期
2019 年5月兵工学报ACTA
ARMAMENTARIIVol.40No.5May2019

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