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Piezoelectric transformer

A technology of piezoelectric transformers and piezoelectric materials, applied in the field of piezoelectric transformers, can solve problems such as electric power limitations

Inactive Publication Date: 2005-11-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the respective lengths of the electrodes 124 and 126 used as primary electrodes are limited to lengths corresponding to one-half of the wavelength relative to the excitation of the elastic wave corresponding to three-half of the wavelength by the rectangular plate 122, , since this is equivalent to the actual electrical-mechanical coupling coefficient k of the primary side electrode eff reduced, so there is still a problem that the electric power that the piezoelectric transformer 120 can handle is limited

Method used

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Embodiment approach 1

[0108] figure 1 is an axial side view of the 3λ / 2 vibration model piezoelectric transformer in Embodiment 1 of the present invention, figure 2 (1) is figure 1 Side view of the piezoelectric transformer shown. exist figure 1 with figure 2 (1) The medium voltage transformer 200 is composed of a rectangular plate 202 made of a piezoelectric material. first use figure 1 The shown Cartesian coordinate system defines the orientation of the rectangular plate 202 . The length direction, width direction and thickness direction of rectangular plate 202 refer to respectively figure 1 The x-axis direction, y-axis direction and z-axis direction in the Cartesian coordinate system. This applies to all voltage transformers described hereinafter. Also, in the following description, the length of one finger means the length in the longitudinal direction of the rectangular plate. The length in the width direction of the rectangular plate and the length in the thickness direction ...

Embodiment approach 2

[0131] Image 6 is an axial side view of a 3λ / 2 vibration model piezoelectric transformer in Embodiment 2 of the present invention, Figure 7 (1) is Image 6 Side view of the piezoelectric transformer shown. exist Image 6 with Figure 7 In (1), the piezoelectric transformer 220 is composed of a rectangular plate 222 made of a piezoelectric material. Primary-side (input-side) electrodes are formed on both main faces perpendicular to the thickness direction of the rectangular plate 222 . Of these two main surfaces, a primary side electrode consisting of electrode 223 , electrode 225 , and electrode 227 is formed on one main surface, and a primary side electrode composed of electrode 224 , electrode 226 , and electrode 228 is formed on the other main surface. Furthermore, the respective centerlines of the electrodes 223 and 224 may be formed to substantially coincide with the centerline 239 of the rectangular plate 222 . The electrodes 223 and 224, the electrodes 225 and 2...

Embodiment approach 3

[0145] Figure 8 is an axial side view of the 3λ / 2 vibration model piezoelectric transformer in Embodiment 3 of the present invention, Figure 9 (1) is Figure 8 Side view of the piezoelectric transformer shown. exist Figure 8 with Figure 9 In (1), the piezoelectric transformer 240 is composed of a rectangular plate 242 made of a piezoelectric material. Near the center of the rectangular plate 242 in the lengthwise direction, a primary-side (input-side) electrode composed of a plurality of electrodes is formed along the lengthwise direction and the thickness direction of the rectangular plate 242 . This is a laminated structure in which a piezoelectric body layer made of a piezoelectric material such as piezoelectric ceramics and an internal electrode layer made of a metal material are laminated in the thickness direction of the rectangular plate 242 .

[0146] Figure 9In (1), five piezoelectric layers and four electrode layers are formed between the primary-side elec...

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Abstract

An objective of the invention is to solve the problem about the fact that the characteristics of a piezoelectric transformer are adversely affected by heat caused by an increase in distortion if the piezoelectric transformer is reduced in size when it deals with a large power, and the piezoelectric transformer is hardly improved in efficiency. According the present invention, a compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.

Description

technical field [0001] The present invention relates to a piezoelectric transformer in which the amplitude value of an AC voltage is changed by the piezoelectric effect of piezoelectric materials such as piezoelectric ceramics. Background technique [0002] Piezoelectric transformers, which were developed as step-up transformers for high-voltage power supplies, were not commercialized at first due to limitations in material properties such as the breaking strength of piezoelectric ceramic materials. However, due to the recent progress in the development of high-strength piezoelectric ceramic materials, and the increase in the miniaturization and lightweight requirements of portable information equipment such as notebook personal computers and portable terminals, piezoelectric transformers are used as power supplies for liquid crystal backlight converters mounted on these instruments. Step-up transformers are once again in the limelight. [0003] For example, in the past, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/282H10N30/40
CPCH05B41/2822H01L41/107H10N30/40
Inventor 武田克中塚宏山口健奥山浩二郎守时克典
Owner PANASONIC CORP
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