Design And Implement Of Multi-module Charge Work In-series For High Voltage Capacitor Bank Based On PCB Board

The high pulsed magnetic field is widely used in many areas,it provides special and extreme environment for material science,chemistry and semiconductor research,etc.The pulsed power system plays an important role in creating pulsed magnetic field.Of all kinds of pulsed power system,the capacitor charging power supply(CCPS)is the most widely used for its simply structure,easy to manufacture and high reliability.However,currently the CCPS is more likely one-module CCPS: designed for one specific voltage and power level,poor flexibility,long design cycle.So,the new design of a modular charging device is proposed in this paper,which aims to develop a capacitor charging power supply with multi modules combined together.This power supply has the advantages of adjustable voltage and power,short development cycle and simple circuit construction.Modular CCPS is a new design idea developed on the basis of traditional one module design method: The idea is to small independent charging modules instead of each product independently.Each small module generates low voltage and their combination generates required power and voltage levels.Each module is a small charger based on series resonance.Each module is integrated on PCB board.The output of each module is connected in series mode so that the total output voltage is the sum of the outputs of each module.Each output is connected with a voltage-equalizing capacitor in parallel to ensure the stability of the output voltage.The output of each module is connected in series,so the output current of each module must be same.The output current is not only related to the parameters of the circuit components,but also to the synchronization of each module.To ensure that each module works synchronously,that is,the switches in each module bridge need to work synchronously.In this paper,the optocoupler that produce driving signal to the switch tube which needs to work synchronously is connected in series,when the driving instruction comes,the optocoupler can be triggered to produce the driving signal synchronously,thus the switch tube of each module works synchronously.First,the component parameters based on the theoretical analysis are calculated.Then simulation model is verified with a prototype.Finally,the construction and test of the experimental platform are accomplished.The experiments of single module and multi module output in-series are carried out.The feasibility of the modularization is verified.A four module charging device with output in-series connections has been finally successfully developed.The maximum output voltage is 8000V(single module output voltage 2000V).The charging current is constant and the voltage linearity is good.The system works stably.