Design of high-speed electron beam scanning system based on Helmholtz coil

ZHANG Wei; JIANG Buhui; CHEN Xiao; LI Qikai; KONG Lingqi

doi:10.7512/j.issn.1001-2303.2021.06.02

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Design of high-speed electron beam scanning system based on Helmholtz coil
Vol. 51, Issue 6, Pages: 7-12(2021)
Published：2021
DOI： 10.7512/j.issn.1001-2303.2021.06.02
稿件说明：

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DOI：

ZHANG Wei, JIANG Buhui, CHEN Xiao, et al. Design of high-speed electron beam scanning system based on Helmholtz coil[J]. Eletric Welding Machine2021, 51(6): 7-12. DOI： 10.7512/j.issn.1001-2303.2021.06.02.

摘要

针对国内电子束偏转扫描线圈的磁感应强度较低、均匀性较差

扫描速度较慢等不足

基于Helmholtz线圈的工作原理

采用空心结构设计了电子束偏转扫描线圈;提出一种双逆推主电路拓扑结构

使扫描线圈的驱动电压增加一倍

从而提高了扫描线圈驱动电流的变化速度;采用电流霍尔传感器和PID调节电路设计了驱动电流闭环控制电路

并利用Labview软件开发了电子束高速扫描控制程序。结果表明:该电子束高速扫描系统扫描线圈的磁感应强度和均匀性能够满足大角度电子束偏转扫描要求

并有效提高驱动电流的变化速率

可以实现电子束高速扫描。

Abstract

Aiming at the disadvantages of domestic electron beam deflection scanning coils such as low magnetic field strength

poor uniformity

and slow scanning speed

based on the working principle of the Helmholtz coil

the electron beam deflection scanning coil is designed with a hollow structure.The circuit topology of push and pull of output voltage is proposed

which doubles the driving voltage of the scanning coil

thereby increasing the speed of change of the driving current of the scanning coil. The current Hall sensor and PID adjustment circuit are used to design the driving current closed-loop control circuit

and the Lab View software is used to develop the electron beam high-speed scanning control program. The results show that the magnetic field intensity and uniformity of the scanning coil of the electron beam high-speed scanning system can meet the requirements of large-angle electron beam deflection scanning. The optimized design of the scanning coil drive circuit effectively increases the rate of change of the driving current and can realize high-speed electron beam scanning.