摘要
超声波电源系统是一种工作在谐振频率将电能转化为超声能的装置,其核心就是频率跟踪控制和功率调节控制。但换能器的温度、刚度变化都会引起谐振频率漂移现象,它不仅会降低系统工作效率,还会损坏电路元器件。为了解决此问题,提出了一种基于FPGA的谐振自动跟踪策略,将快速傅里叶变换(FFT)算法与模糊比例积分微分(PID)控制算法相结合,能够快速捕捉到系统的最佳工作频率。首先,将采样得到的电压、电流时域信号经过FFT算法处理后转换为频域信号,得到其相位信息。然后将相位差和输出功率作为模糊PID控制器的输入来实现谐振自动跟踪。此外,还设计了一种连续可调阻抗匹配网络,根据采样反馈信号设定阻抗网络匹配的参数。最后,搭建实验平台验证了所提控制策略的有效性和准确性。
Ultrasonic power system is a device which works at resonance frequency and its core is frequency tracking control and power regulation control.However,the variation of the temperature and stiffness of the transducer will cause the resonance frequency drift,which will not only reduce the system efficiency but also damage the circuit components.In order to solve this problem,a resonant automatic tracking strategy is proposed based on FPGA which combines fast Fourier transform(FFT) algorithm with fuzzy proportion integration differentiation(PID) control algorithm to quickly capture the optimal working frequency of the system.Firstly,the sampled voltage and current signals are processed by FFT algorithm which can transform the signal in the time domain form into the frequency domain one to obtain the phase information of voltage and current.Then the phase difference and output power are used as the input of fuzzy PID controller to realize the resonance automatic tracking.In addition,a continuously adjustable impedance matching network is designed and the parameters of impedance network matching are set according to the sampled feedback signal.Finally,the effectiveness and accuracy of the proposed control strategy are verified by experiment.
作者
刘宁庄
张远宝
许龙
倪冯俨
LIU Ning-zhuang;ZHANG Yuan-bao;XU Long;NI Feng-yan(Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《电力电子技术》
CSCD
北大核心
2021年第10期80-82,86,共4页
Power Electronics
基金
国家自然科学基金(12074354)。
关键词
超声电源
比例积分微分
阻抗匹配网络
ultrasonic power
proportion integration differentiation
impedance matching network
