Design And Realization Of Acquisition Device For Charge-Discharge Parameters Of High Voltage Capacitor Banks

Effectively charge-discharge of high voltage capacitor banks plays a very important role in the application of pulsed power technology. Pulsed power technology has been widely applied in the domains of national defense scientific research, civilian industrial departments at present, such as electromagnetic pulse simulation, environmental project, bioengineering and so on. As one way of storaging enegy in pulse generating device, the high voltage capacitor banks can not only improve the scope of application of pulsed power technology, but also enhance application efficiency in the acquisition and control of the capacitors in the charge-discharge process. This paper analyses the charge-discharge process mechanism of high voltage capacitor banks, completes timing and setting values of charge and discharge of the capacitor banks using industrial touch screen, programmable logic controller(PLC) and single-chip. The specific research contents are as follows:Firstly, based on the high voltage capacitor banks charge-discharge control circuit design requirements, a mathematical model of RLC vibrating circuit is established, and carry on theory analysis with it. Meanwhile, this paper studies the system discharge circuit in the under-damped state, storage capacitor banks in the process of discharge energy conversion process. Simulation analysis shows that the discharge current pulse peak is at its maximum, when the discharge voltage is 0 V at both ends of the coil; The voltage at both ends of energy storage capacitor banks is 0 V, the pulse discharge current of coil is 0 A.Secondly, in the implementation of the system hardware circuit, we use industrial touch screen and PLC as the main monitoring equipment of high voltage capacitor banks charge-discharge parameters acquisition system. High voltage capacitor banks have those characteristics which could charge-discharge in a short time. In this paper, we proposed a high voltage capacitor banks charge-discharge control circuit system with smallest single-chip system as the core, and completed the implementation of the circuit which could control the cycles, frequency of charge-discharge. In the design of the system circuit, the discharging circuit parameters values should be matched. The touch screen and PLC are applied in high voltage capacitor banks charge-discharge parameters acquisition system, could improve security and convenience of the system application.Finally, combined with the biomedical electromagnetic characteristics, the typical application of high voltage capacitor banks charge-discharge parameters acquisition divce in biomedical engineering field has been introduced in this thesis, and discusses the influence of parameters of the discharge circuit, including total capacitance(C), discharge voltage(V), coil inductance(L) and resistance(R) on coil currents. This study shows that increasing the capacitance of storage capacitor, the amplitude of coil current will be increased. At the same time, the rising time and the duration width of current pulse will be extended, and the dominant frequency of current pulse will be decreased. Decreasing the total resistance of discharge circuit, the amplitude of pulse current will be increased, and the frequency of current pulse will be improved. In the mean time, the current pulse shows the characteristics of multiple oscillations. Increasing the inductance value of discharge circuit, the amplitude of current pulse will be decreased, meanwhile, the rising time of current pulse and duration of pulse width will be increased, and the dominant frequency of current pulse increases to a maximum value and then decreases. Rusults in this paper provide theoretical refences for the selection of magnetic stimulation coil type.