Research on Low-Pressure Breakdown Protection and Reliability Reinforcement for In-Line Ignition Systems
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摘要:为增强直列式点火系统在低气压环境中的工作可靠性，对特定型号的直列式点火产品在低气压条件下的点火性能进行了深入探讨。基于低气压放电理论，发现以空气作为介质时，气体击穿电压的最小阈值约为300 V，与之对应的气压与极板间距乘积约为0.066 kPa·cm。进一步分析了工作高度、导体间距、温度和介质种类对低气压击穿电压的影响，确定了低气压击穿的极限条件：在导体间距为3 mm的情况下，0~30 km高度范围内，30 km（1.197 kPa）处的击穿风险最高；而在0~60 km范围内，42.5 km（0.206 kPa）处为风险极值点。针对上述分析结果，本研究从电路冗余设计、结构密封技术、PCB布局优化、灌封工艺改进以及筛选试验等5个方面提出了优化措施。实际飞行试验验证了优化措施的有效性，表明其显著提升了直列式点火系统在低气压环境下的可靠性。
Abstract:In order to boost the operational reliability of in-line ignition systems in low-pressure environments, the ignition performance of a specific in-line ignition product under low-pressure condition was studied deeply. Based on low-pressure discharge theory, it is found that in airmedium environment, the minimum gas breakdown voltage is roughly 300 V, with the pressure-plate spacing product being about 0.066 kPa·cm. Furthermore, the influences of working height, conductor spacing, temperature, and dielectric type on low-pressure breakdown voltage were analyzed, the extreme conditions for low-pressure breakdown voltage were determined, which are at a conductor spacing of 3 mm, the breakdown risk peak is at 30 km (1.197 kPa) within the 0~30 km height range; within the 0~60 km range, the risk maximum is at 42.5 km (0.206 kPa). In light of these findings, this study proposes optimal measures in five areas: circuit redundancy design, structural sealing technology, PCB layout optimization, potting process improvement, and screening tests. The effectiveness of these measures have been verified through actual flight tests, which show they considerably enhance the in-line ignition system's reliability in low-pressure environments.
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