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http://dx.doi.org/10.6113/JPE.2017.17.5.1150

Full Bridge Resonant Inverter Using Asymmetrical Control with Resonant-frequency Tracking for Ultrasonic Cleaning Applications  

Jittakort, Jirapong (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi)
Sangswang, Anawach (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi)
Naetiladdanon, Sumate (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi)
Koompai, Chayant (Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi)
Chudjuarjeen, Saichol (Department of Electrical and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep)
Publication Information
Journal of Power Electronics / v.17, no.5, 2017 , pp. 1150-1159 More about this Journal
Abstract
Flexibility in the power control of ultrasonic transducers has remained a challenge for cleaning applications. This paper introduces a modification of the existing piezoelectric ceramic transducer (PCT) circuit to increase the range of operation through its impedance characteristics. The output power is controlled using the asymmetrical voltage-cancellation (AVC) method. Together with a phase-locked loop control, the switching frequency of the inverter is automatically adjusted to maintain a lagging phase angle under load-parameter variations during the cleaning process. With the proposed modification, the region of the zero-voltage switching (ZVS) operation is extended, which results in a wider range of output power control. A hardware prototype is constructed and the control algorithm is implemented using an STM32F4 microcontroller. Simulation and experimental results are provided to verify the proposed method for a 50-W PCT. The operating frequency and output power ranges under study are 37 - 41 kHz and 15.8 - 50 W, respectively.
Keywords
Asymmetrical control; Resonant inverter; Ultrasonic cleaner;
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