基于DSP控制的交变磁场装置的研究

Study on the device for alternating magnetic field based on DSP

本文研制一套以DSP为控制核心的变频电源装置,采用新型单相SVPWM调制技术,激励铁氧体线圈可产生频率、场强均可独立调节的交流磁场。主电路部分采用桥式拓扑电路结构,磁场输出部分采用带气隙的回形磁芯,在气隙中产生交变磁场,用于研究磁场对细胞的生物效应。实验效果比较理想,测量结果较精确,系统稳定可靠,数字化界面操作简洁方便。

A set of variable-frequency power supply device based on DSP control is proposed in this paper.The AC magnetic field can be adjusted by frequency and magnetic field intensity independently,which are produced by incentive the ferrite coils using a new single-phase voltage space-vector pulse width modulation（SVPWM）.The main circuit consists of bridge circuit structure,and the double magnetic core with an air-gap is adopted in the output part of magnetic field.The alternating magnetic field is produced though double magnetic to research the biological effects of magnetic field on cells.According to the experiments,the results are perfect,the measurements are precise,the system is stable and reliable,and digital interface is operated concisely and conveniently.