Research On Fuze Piezoelectric Power Supply For Small-caliber Shell

Fuze power supply mainly provides foundational energy for fuze circuit workingand ignition energy for ignition circuit in modern fuze. Aimed at the energy density,long storage property and activation rapidness of modern fuze power supply, a kind ofmissile-borne fuze piezoelectric power supply based on piezoelectric effect is studiedin this thesis.Missile-borne fuze piezoelectric power supply is mainly composed of amultilayer piezoelectric stack，energy harvesting circuit and auxiliary device. Theresearch status of missile-borne fuze power supply and piezoelectric supply isintroduced, and the working principle of fuze piezoelectric power supply is studied.The physical model of missile-borne fuze piezoelectric power supply is established，and the mathematical model is deduced. The property of piezoelectric power supply issimulated using MATLAB software. The data comes from some type anti-aircraftartillery fired when calculating. Then the response curve of charging voltage, therelationship curves between charging voltage and energy-storage capacitor areobtained, at the same time the relationships of charging voltage with excitation loadand time constant are described. After that，the output efficiency of piezoelectric stackis analyzed. When the value of the piezoelectric stack capacitor is equal to theenergy-storage capacitor, the efficiency of energy transfer is largest, reaching25%.While aimed at how to improve the efficiency of energy transfer, energy transfercircuit and energy interface circuit are introduced，and output waveform graph of fullbridge rectifier circuit and its advantage are analyzed. The Synchronized ChargeExtracted circui（tSCE circuit）is introduced for solving the problem that the efficiencyof energy transfer is low when the value of the energy-storage is much higher thanpiezoelectric stack capacitor. This circuit can observably improve the efficiency ofenergy transfer. At last the charge-discharge property of three rechargeable powersupplies is discussed and the advantages and disadvantages of them are compared.The thesis explains that the tantalum electrolytic capacitor is suitable for using asenergy-storage capacitor.In the foundation of theory research of the piezoelectric stack and simulationanalysis，the piezoelectric stack which meets the requirement is designed according tostrength design criterion and energy requirement of fuze circuit. The stack is combined with electrode connected in parallel and structure in serial. The strength ofpiezoelectric stack is checked out through analyzing the stress of piezoelectric stackby ANSYS software. Dynamic loading test and live firing test of piezoelectricpower supply are designed for verifying the reliability of theoretical analysis. Thetests show that the resulting voltage of piezoelectric stack can be up to the demand offuze circuit, and the electricity generation performance in live firing condition issuperior to in testing machine condition. Piezoelectric power supply can be used asmissile-borne fuze power supply with high energy density，short activation time andlong storage performance. So it has a great application prospect used in fuze as energysource in the future.