低电压磁控管的设计-等离子体物理专业论文.docxVIP

万方数据 万方数据 摘 要 摘 要 磁控管作为一种小型高效率低成本的微波电真空器件，在雷达、通讯、医疗 设备、家用微波炉及工业加热等方面有着广泛的应用。由于其结构简单，效率高， 工作电压低，电源简单和适应负载变化的能力强等优点，磁控管在家用微波炉行 业上得到了蓬勃的发展。现阶段微波炉磁控管也开始多样化，出现了高功率管、 高效率管和低成本磁控管等。本文设计的磁控管也是一个新的种类—低电压磁控 管。 微波炉现用磁控管一般采用 4.2KV 阳极电压，工作频率为 2.45GHz，采用 10 个谐振腔谐振系统。本文设计的低压磁控管阳极电压降为 2.4KV 左右，课题在广 东威特真空电子有限公司完成。 本文的主要工作如下： 1、对微波炉磁控管历史，现状和历史进行介绍，介绍磁控管结构和理论，结 合现有微波炉磁控管为低压磁控管制定了一个的设计框架，对低压管阴极进行分 析和设计。 2、对磁控管谐振腔进行分析，对 12 腔谐振系统建模仿真并且使其工作频率 稳定在 2.45GHz 左右。 3、利用 CST 对磁控管磁路进行优化，设计出了一种更为均匀的磁场来提高 磁控管各指标。 4、对低压磁控管建模和进行粒子模拟,得到低压磁控管的各项指标的仿真结 果。 5、制作低压磁控管样管，进行样管实验和结果分析。 6、对低压磁控管的设计进行总结和展望。 关键词：低电压磁控管，磁路优化，谐振腔，粒子模拟，样管试验 I ABSTRACT ABSTRACT Magnetron is a kind of electric vacuum component that can produce microwave energy and it is efficient and low cost. Magnetron has broad applications in radar， communication，accelerating power，medical devices，home microwave oven and industrial heating. Magnetron has got a very good application on microwave oven for it is simple structure, high efficiency, low working voltage, simple power and strong adaptability. Microwave oven magnetrons also begin to diversification. There are high power magnetrons, efficient magnetrons, 5.8G magnetrons and low-cost magnetrons. This design is also a new one, low voltage magnetron. Magnetron’s anode voltage currently used in Microwave oven is 4.2 KV. The number of rectangular resonant cavity is 10. Low voltage magnetron’s anode voltage is about 2.4 KV. The design is finished at WITOL company. In this thesis, the main researching contents are listed as follows: Magnetron’s history, present situation, history, principle and structure are introduced. The low voltage magnetron’s cathode is analyzed and designed. The resonator of magnetron is analyzed. Low voltage magnetron’s resonator model is established and simulated for the working frequency is 2.45GHz. A more uniform magnetic field was designed by using of CST. Particle simulation for low voltage magnetron is accomplished to get various indexes of low voltage magnetron. Low v