2 MHz Power Converter with Piezoelectric Ceramic Transformer

Toshiyuki ZAITSU  Takeshi INOUE  Osamu OHNISHI  Yasuhiro SASAKI  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.2   pp.280-286
Publication Date: 1994/02/25
Online ISSN: 
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.