基于磁控管阳极电流检测的负载状态获取技术  

Load Characteristic Acquirement Technology Based on Magnetron Anode Current Detection

作　　者：官继红 刘长军[2] GUAN Ji-hong;LIU Chang-jun(Shenzhen Megmeet Electric Co.,Ltd.,Shenzhen 518057,China;School of Electronics and Information Engineering,Sichuan University,Chengdu 610064,China)

机构地区：[1]深圳麦格米特电气股份有限公司,广东深圳518057 [2]四川大学电子信息学院,四川成都610064

出　　处：《真空电子技术》2021年第2期19-22,33,共5页Vacuum Electronics

基　　金：973项目(2013CB328902)。

摘　　要：完整的微波系统通常配有定向耦合器以及微波功率计来检测反射功率,并以环行器来隔离反射回来的微波,以保护磁控管不被异常工况所损坏,以及实现更有效的加热控制。小功率磁控管因成本问题通常不会配备昂贵的微波反射检测系统以及环行器,在环行器失效以及未使用环行器的小功率微波系统中,磁控管的极易烧毁。为了解决上述问题,通过研究磁控管的起振模式,在变频电源上检测起振时阳极电流的脉宽特性,实现了对负载状态的获取,可以有效地保护磁控管不会在异常工况下损坏,并实现可靠的微波加热。A conventional microwave system is usually equipped with a directional coupler and a microwave power meter to detect the reflected power, and a circulator to isolate the reflected microwave. So that the magnetron is protected from being damaged by abnormal working conditions and more efficient heating control is achieved. However, low power magnetrons are usually not equipped with expensive microwave reflection detection systems or circulators due to the high cost. In a microwave power source without a circulator, its magnetron is much easier to be burned. In order to solve the above problem, based on the study of the starting mode of a magnetron, the pulse width characteristics of the anode current in starting mode is detected on the frequency conversion board. A detection of the load characteristic is realized, which can efficiently protect the magnetron from damage under abnormal conditions and realize high reliable heating.

关 键 词：微波 空载检测 负载检测 阻抗检测 磁控管保护 阳极电流 脉宽 自动控制 

分 类 号：TN123[电子电信—物理电子学]