手持式X荧光仪电源系统的设计  

Design of the Power System for Handheld X-ray Fluorometer

作　　者：谭承君[1] 曾国强[1] 龚春慧[1] 葛良全[1] 罗群[1] 刘玺尧[1] 吴刚[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,四川成都610051

出　　处：《核电子学与探测技术》2014年第3期380-384,418,共6页Nuclear Electronics & Detection Technology

基　　金：国家高技术研究发展计划(863)项目(2012AA061803);四川省科技厅科技支撑计划项目(2011FZ0064)

摘　　要：手持式X荧光仪所获取谱线的能量分辨率除了决定于荧光脉冲信号处理电路、数字成形滤波算法等,更重要的取决于整套仪器电源系统的合理设计。论文提出一种采用罗耶谐振升压方式给SI-PIN半导体探测器提供+170 V偏置电压的高压电源供电设计方案,避免传统采用PWM波控制变压器升压方式纹波大、效率低的缺陷;同时系统采用电制冷片的温度反馈信号控制供电电源MOS管的导通程度,从而实现对电制冷片温度的控制。实际测试显示该供电方案的高压输出纹波低于10 mV,功耗比传统设计方案低了9.1%,系统同时具有功耗低、纹波小、稳定好等特点,满足手持式X荧光仪野外工作的需要。The energy resolution of handheld X -ray fluorometer was determined by the fluorescence pulse signal processing circuit , digital forming filter algorithm , etc., and more important depending on the rational design of the power supply system for the entire instrument .High voltage power supply design method has been put for-ward, which provides ＋170V bias voltage for SI-PIN semiconductor detector with a resonant Royer booster , avoiding the defects of large ripple and low efficiency with the traditional PWM wave to control the step -up transformer.At the same time, the conduction degree of power supply MOS transistor level was controlled by temperature feedback signal of electric refrigeration piece , in order to realize the electric refrigeration tempera-ture control .The test results show that the output ripple of the system is below 11 mV, and power consumption is 9.1%lower than the traditional design , with low power consumption , small ripple, good stability, meeting the needs of the handheld X -ray fluorometer in field work .

关 键 词：X荧光仪 罗耶谐振 高压电源 温度负反馈 

分 类 号：TL825[核科学技术—核技术及应用]