Research On The Design And Effectiveness Evaluation Technology Of Pulse High-voltage Power Supply System For Electric Shock Weapons

The action mechanism of non-lethal electric shock weapon is to disturb human nervous system by high voltage and low current,which makes human muscles produce contraction effect and lose self-control ability.The electric shock injury is temporary reversible and will not pose a threat to human life and safety.On the one hand,the damage degree of electric shock weapons is directly determined by the performance parameters of electric shock weapons,on the other hand,it is also affected by the complex and changeable environment.So this paper first builds the high-voltage pulse power supply system of electric shock weapons and carries out simulation and test,and then studies the comprehensive operational effectiveness evaluation technology of electric shock weapons.The first part is about the circuit design of high voltage pulse power supply for electric shock weapon.According to the human body current effect,the parameters of the power supply are determined as follows: the highest pulse voltage is 45 kV,the maximum current is20 mA,the power is 30 W,the frequency is 5 kHz~20 kHz,and the duty cycle is 20%~80%.Pulse power supply system consists of four parts: isolated boost main circuit,power tube drive control circuit,single chip control circuit and auxiliary power supply circuit.Isolation boost circuit mainly uses DC-DC push-pull converter and high frequency transformer to raise15 V DC voltage to 45 kV pulse high voltage and output after rectification and filtering;power tube drive circuit uses SG3525 A chip to generate PWM signal to control MOSFET on and off,changing the frequency and pulse width of PWM signal will correspondingly change the frequency and duty cycle of output pulse voltage;The function of AT89C51 timing counting controls P1.0 port output high and low level time,and sets up 16 alternative discharge modes;auxiliary power supply circuit mainly provides stable working voltage for the whole circuit chip.Then the output voltage waveform of the designed circuit is simulated with MULTISIM circuit simulation software under various parameters,and the injury test about the effect of the duration of electric shock on the animal heart is described.It was found that the longer the shock duration,the greater the damage to the dog's heart will be,but the damage will gradually recover over time,but the injury will recover slowly with time after 5 s and 10 s continuous electric shock to dogs with 45 kV voltage.The second part explores the effectiveness evaluation technology of electric shock weapon.Firstly,the inherent performance evaluation method of electric shock weapon is put forward.Eight performance indexes of three types of electric shock weapon are evaluated bygray relational analysis method,and the ranking results of three types of electric shock weapon's performance are obtained.Secondly,the operational effectiveness evaluation method of electric shock weapon in complex environment is established,and the comprehensive operational effectiveness evaluation is formulated by combining the analytic hierarchy process and the fuzzy control analysis method.The operational parameters of the two hypothetical environments are substituted into the process,and the corresponding operational effectiveness scores of the electric shock weapon are 58.87 points and 64.91 points,respectively.The evaluation method can be used to calculate the scores of each battle environment and compare the battle effectiveness.The research results of this paper have a good reference value for the design of power supply system and the research of effectiveness evaluation method of electric shock non-lethal weapon.