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http://dx.doi.org/10.21289/KSIC.2021.24.4.481

A Study on Resonance Tracking Method of Ultrasonic Welding Machine Inverter  

Moon, Jeong-Hoon (Dept. of Electrical Engineering, Chonnam National University)
Park, Sung-Jun (Dept. of Electrical Engineering, Chonnam National University)
Lim, Sang-Kil (Dept. of Automotive Engineering, Honam University)
Kim, Dong-Ok (Dept. of National Innovation Cluster Support Center, Jeonnam Technopark)
Publication Information
Journal of the Korean Society of Industry Convergence / v.24, no.4_2, 2021 , pp. 481-490 More about this Journal
Abstract
In the ultrasonic welding machine, when the load fluctuates, the L and C of the piezo element in the oscillation part change. As a result, the resonant frequency is changed, so it is necessary to match the operating frequency of the ultrasonic welding machine to the new resonant frequency. That is, in order to maximize the output of the oscillation unit of the ultrasonic welding machine, it is inevitable to follow the resonance frequency. Accordingly, many methods for following the resonant frequency are being actively studied. In addition, in order to check the effect of external inductance on the operation of the ultrasonic welding machine, The equivalent circuit of the piezo element was analyzed by including the external inductance for resonance in the equivalent circuit of the piezo element, and the method of selecting an appropriate inductance was described. In this paper, we propose a new system that allows the switching frequency of the inverter to tracking the resonance frequency even if the resonance frequency is changed due to the load of the ultrasonic welding machine.
Keywords
Ultrasonic; Ultrasonic welding machine; Piezo ceramic; Resonance tracking;
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