Full bridge resonant inverter using asymmetrical control with resonant-frequency tracking for ultrasonic cleaning applications
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Author list: Jittakort J., Sangswang A., Naetiladdanon S., Koompai C., Chudjuarjeen S.
Publisher: Springer
Publication year: 2017
Journal: Journal of power electronics (1598-2092)
Volume number: 17
Issue number: 5
Start page: 1150
End page: 1159
Number of pages: 10
ISSN: 1598-2092
eISSN: 2093-4718
Languages: English-Great Britain (EN-GB)
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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. ฉ 2017 KIPE.
Keywords
asymmetrical control, Resonant inverter
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