In this article, a multilayer piezoelectric transformer based on lead-free Mn-doped ceramics is presented. This piezoelectric transformer, with a multilayered construction in the thickness direction, is long, wide, and thick. It operates in the second thickness extensional vibration mode. For a temperature rise of , the transformer has an output power of . With a matching load resistance of , its maximum efficiency approaches 81.5%, and the maximum voltage gain is 0.14. It has potential to be used in low voltage power supply units such as low power adapter and other electronic circuits.
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