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VERY SMALL COIL-LESS ELECTRIC POWER SUPPLIES USING PIEZOELECTRIC CERAMICS FOR MOBILE ELECTRONIC INSTRUMENT

用于移动电子仪器的采用压电陶瓷的超小型无线圈电源

基本信息

批准号：
12355012
负责人：
HIROSE Seiji
金额：
$ 28.07万
依托单位：
YAMAGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12355012/
关键词：
PIEZO-TRANSFORMER AC ADAPTER MINIATURIZATION PIEZO-TRANSDUCER PIEZO-MATERIAL LOSS MEASURMENT ハイパワー評価

项目摘要

This study aimed to realize the very small AC-DC converter and DC-DC converter by using the piezoelectric transformer. Following terms and results have been obtained through the four years'investigations.1.Higher electric power density can be achieved by using the higher mode resonance in the piezoelectric transformer. These facts have been found and confirmed.From these results, the second Radial vibration and the fifth Width Extensional vibration have been selected.2.Design method for the piezoelectric transformer has been established. In the method, the high power characteristics of the piezoelectric ceramic materials have been adopted, which were measured by us.3.Second Radial mode piezoelectric transformer has been investigated as a high power density transformer. High efficiency of 95% has been achieved, and the multilayered type transformer has been made.4.Fifth Width Extensional mode piezoelectric transformer has been investigated as a much higher power density transformer. Also in this transformer, high efficiency of about 90% has been achieved.5.Losses of the piezoelectric material have been measured separately by the automatic measurement system.These experimental values of losses can be used to evaluate the transformer efficiency precisely. The measurement system were developed and improved by us.6.Stable and high efficiency driving and rectifying cicuit have been investigated. In the driving circuit, PLL automatic tracking system has been adopted.

本研究的目的是利用压电式变压器实现超小型AC-DC和DC-DC转换器。经过四年的研究，取得了以下成果：1.利用压电变压器中的高模谐振，可以获得更高的功率密度。发现并证实了这些事实，从中选择了二阶径向振动和五阶宽度伸缩振动。2.建立了压电变压器的设计方法。该方法利用了高功率密度的压电陶瓷材料的高功率特性。3.研究了二阶径向模压电变压器作为一种高功率密度的变压器。实现了高达95%的效率，并制作了多层结构的变压器。4.研究了五宽延伸型压电变压器作为一种功率密度更高的变压器。同时，该变压器的效率也达到了90%左右。5.利用自动测量系统分别对压电材料的损耗进行了测量，这些损耗实验值可以用来准确地评价变压器的效率。6.研究了稳定高效的驱动整流电路。在驱动电路中，采用了锁相环自动跟踪系统。