Jpn. J. Appl. Phys. 47 (2008) pp. 4011-4014 |Previous Article| |Next Article| |Table of Contents|
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AC–DC Converter Based on Parallel Drive of Two Piezoelectric Transformers
System Jisso Research Laboratories, NEC Corporation, 1120 Shimokuzawa, Sagamihara, Kanagawa 229-1198, Japan
1Device Solutions Division, NEC Engineering Ltd., 1753 Shimonumabe, Nakahara-ku, Kawasaki 211-8666, Japan
(Received November 21, 2007; accepted January 30, 2008; published online May 23, 2008)
An AC–DC converter based on a parallel drive of two piezoelectric ceramic transformers was investigated. The transformers operate in a fundamental contour extensional vibration mode which has a large electromechanical coupling factor notwithstanding the use of a piezoelectric transversal effect. The converter includes Al electrolytic capacitors for smoothing circuits and metal oxide semiconductor field effect transistors (MOSFETs) for the switching and rectifying circuits. Maximum converter efficiency of 90% was obtained. The prospect of a low profile, highly efficient and high power (more than 50 W) AC–DC converter with piezoelectric transformers has been obtained through these experimental results.
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