PYRO MEMS Design For FUZE
Electro explosive devices are extensively used in military and civil application for initiation of explosive materials. The semiconductor bridge (SCB) detonator is one of the initiation means for explosive materials. Semiconductor bridge (SCB) igniters are widely used as electro explosive device (EED) for the initiation of explosives and propellants in advanced ammunitions due to its most excellent performance, low all-fire energy (requires small quantities of electrical energy to function), fast function time, less weight, small volume, low cost, immunity to EMI (Electromagnetic interference), ESD (Electrostatic discharge) and RF (Radio Frequency) hazards. SCB is integrated with MEMS based safe, arm and fire (SAF) device. SAF Device is employed in military and defence applications particularly used in missiles for fuzing. We are miniaturizing the system by using SCB and 6-pin microcontroller rather than 20-pin microcontroller previously used. To detonate explosive, detonators are used. An electrical detonator responds to predefined electrical signal to activate an explosive. We are using SCB since it has reduced size, low input energy, fast functioning, digital compatibility and improved safety against ESD and RF interference. ATtiny10 microcontroller is used because of its features like reduced voltage and energy requirements. Here, we have a architecture of Safe, Arm and Fire device (SAF) that constitute a real breakthrough for safe miniature fuzing device. It takes conventional mechanical arm and fire system and integrates them in a single 1cm3 package made of different parts. And on other hand, it combines mechanical arming unit with electrical safety functionality on the same silicon initiator’s chip. It respects the STANAG 4187 norm (1 A/W during 5 minute of no fire) and requires 635 mW for ignition.
Keywords: Semiconductor Bridge (SCB), Electro explosive Device, SCB, MEMS, Safe arm and fire device, detonator, igniter