Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Pyro Squib Circuit Design with Stable Constant Current Driving Method

안정적인 정전류 구동 방식의 파이로 스퀴브 회로 설계

  • Soh, KyoungJae (The 3rd Missile Systems PMO, Agency for Defense Development)
  • 소경재 (국방과학연구소 미사일연구원 3체계단)
  • Received : 2022.06.30
  • Accepted : 2022.09.30
  • Published : 2022.10.05
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Abstract

We proposed a design method for constant current pyro squib circuit. The current method using N MOSFET for the stability problem has a weakness of the current change, requiring a new design. This paper identified the problem with conventional squib circuit where the current is reduced by 25 % when maximum resistance is 3 ohms. Thus, we proposed a stable constant current driving circuit using P MOSFET and PNP BJT. We confirmed stable constant circuit operation through simulations and measurements of the proposed circuit design where the current did not change until the resistance reached 3 ohms.

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References

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