基于在线式微波功率检测的磁控管稳功率研究  

Research on stabilizing power of magnetron based on on-line microwave power detection

作　　者：江子明 陆荣鑑[1,2] 祝前峰 李奉顺 王立杰 JIANG Ziming;LU Rongjian;ZHU Qianfeng;LI Fengshun;WANG Lijie(College of Mechatronic Engineering,Nanjing Forestry University,Nanjing 210037,China;Nanjing Great Wall Medical Equipment Co Ltd,Nanjing 211100,China)

机构地区：[1]南京林业大学机械电子工程学院,江苏南京210037 [2]南京长城医疗设备有限公司,江苏南京211100

出　　处：《传感器与微系统》2025年第2期26-30,共5页Transducer and Microsystem Technologies

基　　金：江苏省“六大高峰人才”项目(第七批次013040024)。

摘　　要：针对以磁控管作为微波源的微波治疗仪输出功率波动严重,对治疗效果产生不利影响的问题,基于耦合式微波功率传感器工作原理设计了一种小型的在线式微波功率检测装置。通过设计优化,改善了磁控管工作过程中温度升高影响检测精度的问题。实验结果表明,该检测装置在30~90 W功率范围内,功率测量值和实际输出功率值的平均绝对误差仅为0.47 W。稳功率环节中,以功率测量值作为反馈信号,采用增量式PID控制器对磁控管输出功率进行负反馈调节,实现了微波开启5 s内,磁控管输出功率与设定功率的相对误差维持在5%以内,有效解决了磁控管输出功率波动严重导致的治疗效果不佳的问题。Aiming at the problem that the output power of the microwave therapeutic apparatus with a magnetron as the microwave source fluctuates seriously,which adversely affects the therapeutic effect,a small on-line microwave power detection device is designed based on the working principle of the coupled microwave power sensor.Through design optimization,the problem that the temperature rise in the working process of the magnetron affects the detection precision is improved.The experimental results show that within the power range of 30~90 W,the average absolute error between the actual output power and measured value of power of the detection device is only 0.47 W.In the power stabilization process,using measured power as feedback signal,the incremental PID controller is used to perform negative feedback adjustment on output power,so that the relative error between the output power of the magnetron and the set power within 5 seconds after the microwave is turned on is maintained within 5%,which effectively solves the problem of poor therapeutic effect caused by serious fluctuations in the output power of the magnetron.

关 键 词：磁控管 在线式微波功率检测 耦合器 检波器 增量式PID 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN123[自动化与计算机技术—控制科学与工程] TP273[电子电信—物理电子学]