一种新型平顶脉冲磁场产生电路

A Novel Flat Top Pulse Magnetic Field Generating Circuit

平顶强磁场可广泛的应用于医疗,军工和基础科学实验中。本文提出了一种基于电容器的新型拓扑电路来实现平顶磁场。该电路由多个电容器并联供电,在放电过程中,依次导通,具有脉宽可调、下降沿快等优点。本文分析了该电路的工作原理,并对由于放电过程中磁体电阻变化难以得到准确解析式,提出了一种新的解决办法,并用遗传算法对放电参数进行了优化。

Flap-top pulsed magnetic field can be widely used in medical, military and basic scientific experiments. This paper proposes a new topology circuit to achieve a flat-top magnetic field based on capacitor power supply. The circuit is powered by a certain number of capacitors in paralled which turn on in the discharge process in proper order, and has the advantages of adjustable pulse width and fast falling edge. In this paper, the working principle of the circuit is analyzed, and a new solution is proposed to solve the problem that it is difficult to obtain accurate analytical expression due to magnet resistance change during discharge. Meanwhile, optimizing the discharge parameters using the genetic algorithm is introduced. The simulation by Matlab/Simulink shows that the flap-top pulsed magnetic field of 54.75 T/7 ms by means of a single coil based on the proposed topology circuit can be realized.