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2 MHz Power Converter with Piezoelectric Ceramic Transformer
Toshiyuki ZAITSU Takeshi INOUE Osamu OHNISHI Yasuhiro SASAKI
IEICE TRANSACTIONS on Electronics
Publication Date: 1994/02/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
piezoelectric transformer, DC-DC converter, high-frequency switching, class-E switching converter,
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A power converter with a new piezoelectric transformer is presented. The piezoelectric transformer, made of lead titanate solid solution ceramic, is operated with a thickness extensional vibration mode. This transformer can operate at high frequency, over several megahertz, with about 90% high efficiency. The resonant frequency for the transformer is 2 MHz. The power converter with the transformer applies the theory for a class-E switching converter using an electromagnetic transformer. Maximum output power was obtained when the switching frequency was slightly higher than the resonant frequency. 4.4 W output power was successfully obtained with 52% efficiency at 2.1 MHz switching frequency.