Digital Ultrasonic Power Supply Generator For 20kHz Ultrasonic Welding Machines with PLC Connection

With the emergence of high-performance chips such as DSP and FPGA, the digital and intelligent control of ultrasonic transducers has become a reality. This lays the foundation for the digital control system for automatic tracking of resonant frequency of ultrasonic transducers based on PI strategy proposed in this article. In this paper, starting from the electrical equivalent circuit of the ultrasonic transducer, the impedance characteristics of the transducer are analyzed, and the influence of different matching methods and parameters on the Electromechanical coupling coefficient of the system is discussed using Matlab/Simulink simulation platform. A more reasonable matching network and parameters are selected, which provides a basis for the realization of automatic tracking of the resonant frequency of the ultrasonic transducer.