Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Adjusted power of class D-ZVS resonant inverter controlled by buck converter for LCLC resonant tank

  • Jirapong Jittakort (Department of Electrical Engineering, Faculty of Technical Education, Rajamangala University of Technology Thanyaburi) ;
  • Suwat Kitcharoenwat (Department of Electrical and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Krungthep)
  • Received : 2023.01.22
  • Accepted : 2023.06.14
  • Published : 2023.12.20
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Abstract

This paper presents a modification of class D zero-voltage-switching (D-ZVS) resonant inverter for ultrasonic cleaning applications. The output power is controlled using the adjustable duty of a buck converter. Combined 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 inverter maintains ZVS throughout the power control range. Moreover, the snubber capacitor connection is used to reduce turn-of losses. The control algorithms are implemented using digital signal processing (TMS320F28335 for buck converter and TMS320F28379D for inverter). The proposed method for a 100-W piezoceramic ultrasonic transducer (PZT) is verified using computer simulation and laboratory experimental results and is found to be more efficient than other methods. The operating frequency and power ranges under investigation are 36.5-36.96 kHz and 15-95 W, respectively.

Keywords

References

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