基于罗耶谐振的微型X射线管高压电源的设计  

Design of high voltage power supply of miniature X-ray tube based on resonant Royer

作　　者：刘玺尧[1] 曾国强[1] 谭承君[1] 罗群[1] 龚春慧[1] 黄锐[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059

出　　处：《核技术》2013年第8期66-70,共5页Nuclear Techniques

基　　金：高技术发展计划(863)项目(2012AA061803);四川省科技厅科技支撑计划项目(2011FZ0064)资助

摘　　要：根据现有的微型X射线管高压电源的基本性能要求,设计了一种输出从0至30 kV可调的微型X射线管用高压直流电源。主电路采用直流电源供电,经过罗耶谐振逆变电路、高频变压器、正负双向倍压整流电路而达到产生直流高压的目的。在稳压电路中采用了反馈控制谐振三极管基极电流的方式,整个电路处于线性工作状态。实测数据表明,电路实现了低噪声、低纹波、低功耗的高压稳压电源设计。Background： In recent years, X rays are widely used in various fields. With the rapid development of national economy, the demand of high quality, high reliability, and high stability miniature X-ray tube has grown rapidly. As an important core component of miniature X-ray tube, high voltage power supply has attracted wide attention. Purpose： To match miniature, the high voltage power supply should be small, lightweight, good quality, etc. Based on the basic performance requirements of existing micro-X-ray tube high voltage power supply, this paper designs an output from 0 to -30 kV adjustable miniature X-ray tube voltage DC power supply. Compared to half-bridge and full-bridge switching-mode power supply, its driving circuit is simple. With working on the linear condition, it has no switching noise. Methods： The main circuit makes use of DC power supply to provide the energy The resonant Royer circuit supplies sine wave which drives to the high frequency transformer＇s primary winding with resultant sine-like high voltage appearing across the secondary winding. Then, the voltage doubling rectifying circuit would achieve further boost. In the regulator circuit, a feedback control resonant transistor base current is adopted. In order to insulate air, a silicone rubber is used for high pressure part packaging, and the output voltage is measured by the dividing voltage below -5 kV. Results： The stability of circuit is better than 0.2%/6 h and the percent of the output ripple voltage is less than 0.3%. Keeping the output voltage constant, the output current can reach 57 μA by changing the size of load resistor. This high voltage power supply based on resonant Royer can meet the requirement of miniature X-ray tube. Conclusions： The circuit can satisfy low noise, low ripple, low power and high voltage regulator power supply design. However, its efficiency is not high enough because of the linear condition. In the next design, to further reduce power consumption, we could improve the efficiency by controllin

关 键 词：高压电源 罗耶谐振 倍压整流电路 

分 类 号：TL825[核科学技术—核技术及应用]