Efficiency improvement of piezoelectric-transformer DC-DC converter

Author

Yamane, Takashi ; Hamamura, Sunao ; Zaitsu, Toshiyuki ; Minomiya, T. ; Shoyama, Masahito ; Fuda, Yoshiaki

Author_Institution

Dept. of Electr. & Electron. Syst. Eng., Kyushu Univ., Fukuoka, Japan

Volume

2

fYear

1998

fDate

17-22 May 1998

Firstpage

1255

Abstract

Piezoelectric-transformers (PT) have a lot of merits in comparison with magnetic transformers. We have previously presented some types of piezoelectric-transformer DC-DC converters (PT-converters) for AC-adapters, but their efficiency was restricted. The maximum efficiency was less than 80%. Furthermore, the frequency characteristics of efficiency are not good due to the power loss generated in the input filter circuit of the PT. In this paper the improvement of the converter efficiency by using a different rectifier circuit topology and a synchronous-rectifier technique is described. Furthermore, the frequency characteristics of efficiency are improved by using a different topology of the input filter circuit and its optimum design. As a result, the converter efficiency has been increased up to 88% and the frequency characteristics of the efficiency is also improved

Keywords

DC-DC power convertors; piezoelectric devices; rectifying circuits; transformers; 88 percent; AC-adapters; efficiency improvement; frequency characteristics; input filter circuit; maximum efficiency; piezoelectric-transformer DC-DC converter; power loss; rectifier circuit topology; synchronous-rectifier technique; Character generation; Circuit topology; DC-DC power converters; Filters; Frequency conversion; Magnetic separation; Power generation; Rectifiers; Synchronous generators; Transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE

Conference_Location

Fukuoka

ISSN

0275-9306

Print_ISBN

0-7803-4489-8

Type

conf

DOI

10.1109/PESC.1998.703167

Filename

703167