高频感应热成像电源的全数字频率跟踪技术  

All-digital Frequency Tracking Technology for High-frequency Induction Thermal Imaging Power Supply

作　　者：王同辉 王晓娜[1] 侯德鑫[1] 叶树亮[1] WANG Tong-hui;WANG Xiao-na;HOU De-xin;YE Shu-liang(Institute of Industry and Trade Measurement Technique , China Jiliang University, Hangzhou 310018 , China)

机构地区：[1]中国计量大学工业与商贸计量技术研究所

出　　处：《电力电子技术》2019年第6期39-41,98,共4页Power Electronics

基　　金：国家重大科学仪器设备开发专项(2013YQ470767)~~

摘　　要：针对传统高频感应加热电源中谐振频率搜索慢、频带窄的问题,提出一种改进型全数字频率跟踪技术,该频率跟踪技术根据相位差大小,变步长改变直接数字合成器(DDS)模块的频率控制字,调节电源的工作频率以实现谐振频率跟踪。首先分析了其工作原理,并根据系统控制参数与系统动态性能的数学表达式,仿真分析其频率跟踪过程,最后通过实验验证了所提频率跟踪技术的正确性。Aiming at the problems of slow searching resonant frequency and narrow search band in traditional high- frequency induction heating power supply, a modified all-digital frequency tracking technology is proposed. According to the phase difference, the frequency tracking technology changes the direct digital synthesizer (DDS) module by var iable step size.The frequency control word adjusts the operating frequency of the power supply to achieve resonant frequency tracking.Firstly, the principle of the frequency tracking controller is analyzed and according to the system control parameters and the mathematical expression of the system dynamic performance the frequency tracking process is simulated.Finally , the correctness of the proposed frequency tracking technology is verified by experiment.

关 键 词：电源 全数字频率跟踪 直接数字合成器 

分 类 号：TN86[电子电信—信息与通信工程]