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 m A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。
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 0-160mA 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.
出处
《中国测试》
北大核心
2017年第7期78-82,共5页
China Measurement & Test
基金
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)
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
excitation light source
pulse high voltage current stabilization
closed -loop current stabilization
current blocking
digital settings
