作者：张涛¹, 王洪辉¹, 庹先国^1,2, 李鄢¹, 奚大顺¹

作者单位：1. 成都理工大学核技术与自动化工程学院, 四川 成都 610059;
2. 四川理工学院, 四川 自贡 643000

关键词：激发光源;脉冲高压稳流;闭环稳流;电流闭锁;数字设置

摘要：

为提高原子荧光仪中激发光源的瞬间激发强度及其光谱稳定性，提出一种基于VMOS管稳流原理的双通道脉冲高压稳流电路设计方法，即采用由VMOS管和放大器组成的电流闭环负反馈电路来维持峰值电流稳定，从而实现激发光源激发强度的稳定。设计稳流控制信号处理电路、闭环稳流电路、稳流闭锁电路及高压供电电路。在驱动不同阻抗元素灯及供电电压在150~250 V波动时，工作电流波动幅度均在0.4%以内；输出电流可在0~160 mA数字设置，与设置电流线性相关度为0.998 7。测试结果表明：该设计的电流稳流效果较好，能满足不同元素灯及不同强度工作电流的驱动要求。

Design of the current stabilization circuit of dual-channel pulse high voltage

ZHANG Tao¹, WANG Honghui¹, TUO Xianguo^1,2, LI Yan¹, XI Dashun¹

1. College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China;
2. Sichuan University of Science and Engineering, Zigong 643000, China

Abstract: To enhance the instantaneous excitation intensity and the spectral stability of excitation light source in atomic fluorescence spectrometer, a dual-channel pulse high voltage current stabilization circuit design method based on VMOS tube current stabilization principle was proposed. A closed loop negative feedback circuit consisting of a VMOS tube and an amplifier was used to maintain the peak current stability, so as to achieve the stability of excitation light source's intensity. Constant-current control signal processing circuit, closed-loop current stabilization circuit, constant-current lock out circuit and high-voltage power supply circuit were designed. The working current amplitude was within ±0.4% when driving lamps with different impedance elements or the power supply voltage ranges between 150 V and 250 V, the output current could be digital settings within 0-160 mA and the linear correlation between output current and setting current was 0.998 7. Test results show that the current stabilization effect of the design is excellent and the design can meet the drive demand of the different element lamps and different working current intensity.

Keywords: excitation light source;pulse high voltage current stabilization;closed-loop current stabilization;current blocking;digital settings

2017, 43(7): 78-82  收稿日期: 2016-10-10;收到修改稿日期: 2016-12-13

基金项目: 国家重大科研仪器设备研制专项（41227802）；成都理工大学中青年骨干教师培养计划项目（KYGG201513）

作者简介: 张涛(1991-),男,四川广安市人,硕士研究生,专业方向为智能仪器及信号处理。

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