Piezoelectric Ceramic Transformer Operating in Contour-Extensional Vibration  Mode for AC-DC Converters

Takeshi INOUE; Mitsuru YAMAMOTO; Yasuhiro SASAKI; A. OCHI; Sunao HAMAMURA

doi:10.14852/jcersjsuppl.112.0.S1129.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 15

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S1129.0

Conference information

Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Piezoelectric Ceramic Transformer Operating in Contour-Extensional Vibration Mode for AC-DC Converters

Takeshi INOUE, Mitsuru YAMAMOTO, Yasuhiro SASAKI, A. OCHI, Sunao HAMAMURA

Author information

Keywords: Piezoelectric, Ceramics integration, Transformer, AC-DC converter, Multilayer

CONFERENCE PROCEEDINGS FREE ACCESS

Details

Abstract

A piezoelectric transformer used for AC-DC converters is described that has a multilayered construction in the thickness direction and operates in contour-extensional vibration mode. By using a finite element method, the internal electrode shape was analyzed. The output impedance is designed to be low, approximately several tens of ohms. Tape-casting technique was used to fabricate the multilayer piezoelectric transformers. Testing of a fabricated transformer 14 mm long, 14 mm wide, and 5.8 mm thick showed that it had a 0.4 gain, 30 W output power, and 97% efficiency at 135 kHz when the temperature increase was 30 degrees centigrade. A fabricated AC-DC converter with this transformer had good load regulation and a maximum efficiency of 90.2%. Furthermore, the electrical drive of two piezoelectric transformers with parallel connection was fundamentally investigated, in order to achieve higher electrical capacity of AC-DC converter.

Corresponding author

Register with J-STAGE for free!