基于正弦脉宽调制的谐振加热频率跟踪研究  

Research of resonant heating frequency tracking based on sinusoidal pulse width modulation

作　　者：巫付专[1] 彭圣[1] 王耕[1] Wu Fuzhuan;Peng Sheng;Wang Geng(School of Electric and Information Engineer,Zhongyuan University of Technology,Zhengzhou 451191,China)

机构地区：[1]中原工学院电子信息学院,郑州451191

出　　处：《电测与仪表》2018年第8期30-34,共5页Electrical Measurement & Instrumentation

基　　金：河南省教育厅科学技术研究重点项目(13B470299)

摘　　要：针对低频串联谐振加热系统功率调整范围小、频率调节慢且硬件复杂等问题。采用AC/DC/DC/AC拓扑结构;基于DSP过零捕获与SPWM相结合,检测电压与电流是否同相;根据相位差的大小进行变步长控制,加快调节速度,减小震荡,使感应加热系统工作在谐振状态;通过调节SPWM的调制度增大温度的调节范围;重点分析了电流过零检测电路对相位滞后的影响,提出了改进方法;利用TMS320F28335等搭建了样机电路,对采用的控制算法进行了验证,实验结果表明了所选电路及控制策略的可行性。For the problems of low frequency series resonant heating system,such as small power adjustment range?slow frequency rhythm and hardware complex in the process,the AC/DC/DC/AC topology is used in this paper.In this construction,based on the combination of DSP zero-crossing capture and SPWM,to detect whether the voltage and current is in the same phase or not.The variable step control is conducted according to the size of the phase difference to accelerate the speed adjustment and reduce the shock,so as to control the induction heating system work in the resonant state.Temperature adjustment range is increased through adjusting the SPWM modulation degree.Not only the influence of current zero-crossing detection circuit on phase lag is analyzed,and an improved method is proposed,but also TMS320F28335 and so on are used to construct prototype circuits and verified the control algorithm.In conclusion,the experimental results show the feasibility of the selected circuit and control strategy.

关 键 词：串联谐振加热 正弦脉宽调制 频率跟踪 变步长调节 

分 类 号：TM93[电气工程—电力电子与电力传动]