Micro-switch Dynamic Control Technology For Low-power Power Supply

Aiming at the two main problems of the energy storage capacitor charging,discharging power control and electric detonator state control of the fuze electric ignition control system,in order to avoid the possibility of bomb explosion,muzzle explosion,and ballistic explosion.It is necessary to strengthen the charge and discharge control of the fuze ignition control circuit energy storage power supply,and it is of great significance to improve the safety of the fuze.After comprehensively controlling the power supply of the armor-piercing fuze at home and abroad,the environment inside the armor-piercing shell was analyzed.Based on the results of this analysis,parameters such as the power supply time in the chamber of the ignition circuit's storage capacitor and the switching threshold were determined.An improved scheme for charging and discharging sequence control of energy storage power supply of ignition control system based on micro inertia switch control is proposed.The inertia force and timing characteristics of projectile flight are used to focus on the research of micro switch control technology for charging in the gun barrel.Under the constraint of the small volume of the fuze space,considering that the key problem of electrode technology in domestic MEMS manufacturing micro switches is difficult to solve,a manufacturing process method that can be commercialized as soon as possible is sought.For the first time in the manufacture of fuze parts,the 3D printing SLM process method was attempted.Metal miniature"plastically deformed inertial electrical switches"made of titanium and aluminum alloys were designed,and the theoretical analysis of the feasibility of the switching action was performed.Orthogonal experiments were used to analyze the number of influences of the switch head diameter,electrode width,and thickness on the contact performance of the electrode.The results showed that the switch head diameter had the largest impact and the electrode width and thickness had the smallest impact on the contact.The optimal combination of structure size is A₂B₁C₃,that is,the maximum contact area is 1.8mm²when the switch diameter level 2,electrode width level 1,and electrode thickness level 3.The orthogonal experiment design method was used to analyze the effects of the scanning distance,scanning speed,and laser power on the surface quality of the plastic deformation inertial electrical switch manufactured by the SLM process.A better combination of printing parameters was determined.Two prototypes of plastically deformed inertia switch with titanium alloy and aluminum alloy were made by additive manufacturing technology.In order to improve the surface quality of the parts to reduce the on-resistance of the switch,and to accumulate experience and provide parameter references for improving the 3D printed SLM process to manufacture the fuze control switch,calculate and measure the on-resistance and electrode contact resistance of the prototype switch.The results show that the switch meets the requirements of the power supply's electrical conductivity.A laser displacement measurement system was used to measure the plastic deformation of the titanium alloy and aluminum alloy plastic deformation inertia switch electrodes under simulated shock conditions,and the mechanical strength of the switch was analyzed.The results show that the change law of“load-displacement”of the plastic electrodes of the two switches is basically in accordance with the theoretical analysis.The research results show that the 3D printed SLM process for manufacturing plastic deformation inertia electrical switches of titanium alloys and aluminum alloys will be suitable for the inertial environment of the fuze controlled by the power supply.