Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 8, Pages 8886-8894Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3157620
Keywords
Vibrations; Transformers; Metals; Voltage; Piezoelectric transducers; Equivalent circuits; Ceramics; Coupled vibration; high power; piezoelectric transformer (PT); sandwiched piezoelectric transducers
Categories
Funding
- Beijing Municipal Natural Science Foundation [2214085]
- National Natural Science Foundation of China [12174240, 11874253]
- Fundamental Research Funds for the Central Universities [2020CBLY003]
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This article develops a high-power piezoelectric transformer based on sandwiched piezoelectric transducers with multioutput characteristics. The accuracy of the electromechanical equivalent circuit model (EECM) is verified by finite element method and experiments. The output power of the sandwiched piezoelectric transformers can reach at least 45 W and maintain an efficiency of approximately 35% under high-input electric power.
This article develops a high-power piezoelectric transformer based on the sandwiched piezoelectric transducer with multioutput characteristics. An advanced high-power voltage transformation technology is realized via using the superior mechanical robustness of the sandwiched piezoelectric transducers. High-power sandwiched piezoelectric transformers (s-PTs) with the unique crisscrossed structure are constructed by four sandwiched piezoelectric transducers with two modes, i.e., antiphase mode and in-phase mode, due to the coupled vibration of the central metal cuboid. Moreover, the related electromechanical equivalent circuit model (EECM) of the s-PTs is established in which two loss factors are introduced into this model, and its impedance characteristics, voltage gains, and power gains are studied as well. The accuracy of EECM is verified by the finite element method and experiments. Results reveal that s-PT has three outputs, and its voltage gains and power ratios are affected by load resistance and loss. The output power of the s-PTs can reach at least 45 W, and the s-PTs can keep the efficiency of similar to 35% under high-input electric power, which provides a new idea for high-power piezoelectric transformers.
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