Design Of A MEMS Power Switch For Fuze

MEMS provides the technical support for fuze miniaturization and intelligent development. Based on the fuze application environment, a micro mechanical inertial latching switch of fuze that can distinguish between normal launching acceleration pulse and accidental fall acceleration pulse is designed. The switch referred to as MEMS inertial electronic switch. The switch can be used for intelligent connection on fuze power and subsequent circuit.The MEMS inertial electronic switch latches detecting the response of the normal launching environment. And the switch can’t latch when accidental fall acceleration is applied to it. Through the analysis of the fuze environment, the paper choose the lowest normal launching acceleration which peak value is 3000g and width is 3ms and highest accidental fall acceleration which peak value is 15000g and width is 0.3ms to be typical distinguishing load. At the same time, the switch should not be damaged under the overload pulse when 30000g.MEMS inertial electronic switch is composed with distinguishing system and latching system. The distinguishing system is composed with mass-spring-damp system which has Z-teeth-structure and the latching system is composed with single degree of freedom mass-spring system. Based on dynamical formula of the system,, the paper focuses on the influence of Z-teeth-structure on the system’s damping coefficient. On the other hand, the paper presents a method for quickly finding the optimal system damping to distinguish different peak loads. The result of modal and transient simulation from ANSYS WORKBENCH reveals that under normal launching acceleration, switch can be latched stably and the resistance is in the range of allowable value. At the same time, under accidental fall acceleration the switch can’t be latched. Switch can restore to its original position. Under high overload condition, the flexible structure of switch can be well protected and maximum stress is less than the material tensile stress.Finally, process of switch is designed.