JPH02869B2 - - Google Patents
Info
- Publication number
- JPH02869B2 JPH02869B2 JP56032065A JP3206581A JPH02869B2 JP H02869 B2 JPH02869 B2 JP H02869B2 JP 56032065 A JP56032065 A JP 56032065A JP 3206581 A JP3206581 A JP 3206581A JP H02869 B2 JPH02869 B2 JP H02869B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric ceramic
- transformer
- ceramic transformer
- present
- electrodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 37
- 238000010248 power generation Methods 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims 2
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/40—Piezoelectric or electrostrictive devices with electrical input and electrical output, e.g. functioning as transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Description
【発明の詳細な説明】
本発明は、捩りモード圧電磁器トランスの構造
に係わり、圧電磁器トランスの小型化、高効率化
を図ることを目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a torsion mode piezoelectric ceramic transformer, and aims to make the piezoelectric ceramic transformer smaller in size and more efficient.
圧電磁器トランスは、通常共振状態で使用さ
れ、共振周波数において最大の効率及び昇圧比が
得られるものであり、一般の巻線型トランスに比
較して、
(1) 小型化がはかれること
(2) 不燃化ができること
(3) 電磁誘導がないこと
など数多くの特徴を備えており、テレビジヨンの
高圧発生用をはじめさかんに実用化が進められて
いる。 Piezoelectric ceramic transformers are normally used in a resonant state, and achieve maximum efficiency and step-up ratio at the resonant frequency.Compared to general wire-wound transformers, they are (1) smaller in size, (2) non-flammable. (3) It has many features such as the absence of electromagnetic induction, and is currently being put into practical use, including for high voltage generation in televisions.
第１図は従来の代表的な圧電トランスであるロ
ーゼン型圧電磁器トランスの構造を示す。第１図
について説明すると、左半分１１が圧電磁器トラ
ンスの駆動部分であり、その上下面に電極１３，
１４が設けらており、この部分は厚み方向に分極
されている。また、右半分１２は発電部分であ
り、その右端面に電極１５が設けられており、発
電部分１２は長さ方向に分極されている。駆動電
極１３，１４に電圧が印加されると横効果31モー
ドで縦振動が励振され、縦効果33モードによつて
電極１５から高電圧が取り出される。 FIG. 1 shows the structure of a Rosen type piezoelectric ceramic transformer, which is a typical conventional piezoelectric transformer. To explain Fig. 1, the left half 11 is the drive part of the piezoelectric ceramic transformer, and the electrodes 13 are on the upper and lower surfaces of the drive part.
14 is provided, and this portion is polarized in the thickness direction. Further, the right half 12 is a power generation portion, and an electrode 15 is provided on its right end surface, and the power generation portion 12 is polarized in the length direction. When a voltage is applied to the drive electrodes 13 and 14, longitudinal vibration is excited in the transverse effect 31 mode, and a high voltage is extracted from the electrode 15 in the longitudinal effect 33 mode.
第１図に示した従来の圧電磁器トランスでは、
縦振動の音速νは、密度をρ、弾性コンプライア
ンスをSE 11としたとき、ほぼν＝√１／（ρSE 11）
となり、その値は一般の圧電磁器材料で3000〜
4000ｍ／secである。この縦振動の音速は、他の
振動モードにおける音速よりも大きく、また縦振
動を利用していることから、圧電磁器トランスの
長さで一方的に使用周波数がきまるためトランス
の小型化をはかる場合一定の限界があつた。 In the conventional piezoelectric ceramic transformer shown in Fig. 1,
The sound speed ν of longitudinal vibration is approximately ν=√1/(ρS E 11 ) where the density is ρ and the elastic compliance is S E 11
The value is 3000~ for general piezoelectric ceramic materials.
It is 4000m/sec. The sound speed of this longitudinal vibration is higher than the sound speed in other vibration modes, and since longitudinal vibration is used, the operating frequency is determined unilaterally by the length of the piezoelectric ceramic transformer, so when trying to downsize the transformer. There were certain limits.
次に、第１図の圧電磁器トランスの昇圧比を上
げるためには、板厚を薄くするとか幅方向の寸法
を増すといつた対策が必要となる。しかし、板厚
を薄くしていくと、発電部分１２の容量に比べ駆
動部分の容量を大きくできる反面、出力インピー
ダンスが高くなり、出力電圧の負荷に対する安定
性が劣化するという欠点がある。一方、幅寸法を
増していく対策をとつたときは、出力インピーダ
ンスを低下させることはできるが、電気機械結合
係数k31、k33に形状依存性があり、幅／長さの値
が0.3以上になると、k31、k33の値が低下しはじ
めるため、幅をむやみに広くすることはできず、
幅をある程度以上増すと昇圧比はむしろ減少す
る。 Next, in order to increase the step-up ratio of the piezoelectric ceramic transformer shown in FIG. 1, it is necessary to take measures such as reducing the thickness of the plate or increasing the dimension in the width direction. However, if the plate thickness is made thinner, the capacity of the drive part can be increased compared to the capacity of the power generation part 12, but on the other hand, the output impedance increases and the stability of the output voltage against the load deteriorates. On the other hand, when measures are taken to increase the width dimension, the output impedance can be lowered, but the electromechanical coupling coefficients k 31 and k 33 are shape dependent, and the width/length value is 0.3 or more. , the values of k 31 and k 33 begin to decrease, so the width cannot be made unnecessarily wide.
If the width is increased beyond a certain level, the boost ratio will actually decrease.
さらに、圧電セラミツク材料では、電気機械結
合係数k33の値は0.5を超えるものが容易に得られ
るが、k31の値はせいぜい0.3である。即ちk31の
値が小さいために、電気エネルギーが機械振動エ
ネルギーに変換される効率が悪く、従つてトラン
スとしての効率も悪いという欠点があつた。 Furthermore, in piezoceramic materials, values of the electromechanical coupling coefficient k 33 exceeding 0.5 are easily obtained, whereas values of k 31 are at most 0.3. That is, since the value of k 31 is small, the conversion efficiency of electrical energy into mechanical vibration energy is low, and therefore the efficiency as a transformer is also low.
本発明は上記欠点を解消するためになされたも
のであり、十分な機能を発揮する小型の圧電トラ
ンスを提供せんとするものである。 The present invention has been made in order to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide a compact piezoelectric transformer that exhibits sufficient functions.
以下、本発明の一実施例を図面によつて説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第２図は本発明の圧電磁器トランスの一実施例
を示す。２０及び２１は、あらかじめ矢印で示し
たように長手方向に互いに逆向きに分極処理され
た圧電磁器板であり、接着剤２２で強固に接着さ
れており、左端から中央部分にかけて駆動電極２
３，２３′が設けられている。ついで駆動端子２
５，２５′から電気的に励振すると、分極方向が
互いに逆向きであることにより、圧電磁器板２
０，２１において互いに逆向きの辷り振動が励振
される。このとき、接着剤２２で強固に接着され
ているために、辷り振動が捩り振動に変換され
る。 FIG. 2 shows an embodiment of the piezoelectric ceramic transformer of the present invention. 20 and 21 are piezoelectric ceramic plates that have been polarized in opposite directions in the longitudinal direction as shown by the arrows, and are firmly bonded with adhesive 22, and a drive electrode 2 is formed from the left end to the center.
3, 23' are provided. Then drive terminal 2
When electrically excited from 5 and 25', the piezoelectric ceramic plate 2
At 0 and 21, sliding vibrations in opposite directions are excited. At this time, since they are firmly bonded with the adhesive 22, the sliding vibrations are converted into torsional vibrations.
次に、駆動電極２３，２３′とギヤツプを設け
て、圧電磁器板２０，２１の右側部分に出力電極
２４，２４′を設け、出力電極２４，２４′から出
力端子２６，２６′を設ける。出力電極２４，２
４′において、互いに逆向きの辷り振動から電気
機械結合係数k15を介して電圧が出力されるわけ
である。 Next, drive electrodes 23, 23' and gaps are provided, output electrodes 24, 24' are provided on the right side portions of the piezoelectric ceramic plates 20, 21, and output terminals 26, 26' are provided from the output electrodes 24, 24'. Output electrode 24,2
4', a voltage is output from the sliding vibrations in opposite directions via the electromechanical coupling coefficient k15 .
このような構造をもつ本発明の圧電磁器トラン
スは以下に示すような、従来の圧電磁器トランス
にはない優れた特徴を有するものである。 The piezoelectric ceramic transformer of the present invention having such a structure has excellent features not found in conventional piezoelectric ceramic transformers, as shown below.
まず、捩り振動に関する弾性スチフネスは、縦
振動に関する弾性スチネフスより小さく、従つて
捩り振動の音速は縦振動の音速より小さいわけで
あるから、圧電磁器トランスを小型にすることが
できる。また断面形状によつて捩り振動の実効的
な音速を小さくすることができ、板厚に対する板
幅の値が大きくなるほど実効的な音速は小さくな
る。即ち、断面形状によつてもさらに小型化を図
ることができるわけである。 First, since the elastic stiffness related to torsional vibration is smaller than the elastic stiffness related to longitudinal vibration, and therefore the sound speed of torsional vibration is smaller than the sound speed of longitudinal vibration, the piezoelectric ceramic transformer can be made smaller. In addition, the effective sound speed of torsional vibration can be reduced depending on the cross-sectional shape, and the effective sound speed becomes smaller as the value of the plate width relative to the plate thickness increases. In other words, it is possible to further reduce the size by changing the cross-sectional shape.
第２に、第１図に示した従来の圧電磁器トラン
スでは、k31が小さいためにおこるトランスの効
率の悪化を避けることができなかつたが、本発明
の圧電磁器トランスは駆動、発電ともに辷り結合
係数k15にのみ関係し、圧電磁器材料ではk15の値
は0.5以上のものが容易に得られる。 Second, in the conventional piezoelectric ceramic transformer shown in Fig. 1, deterioration in efficiency of the transformer caused by small k 31 could not be avoided; It is related only to the coupling coefficient k 15 , and in piezoelectric ceramic materials, k 15 values of 0.5 or more can easily be obtained.
第３に、第１図に示したような従来の圧電磁器
トランスでは、k31及びk33に形状依存性があり、
長さに対する幅の値が0.3以上になると小さくな
るという欠点を有していたが、本発明の圧電磁器
トランスでは、k15に対してこのような形状依存
性はない。 Thirdly, in the conventional piezoelectric ceramic transformer as shown in Fig. 1, k 31 and k 33 have shape dependence;
However, in the piezoelectric ceramic transformer of the present invention, there is no such dependence on shape with respect to k15 , although it has the disadvantage that it becomes small when the value of width to length becomes 0.3 or more.
第４に、周知の如く捩り振動子は縦振動子に比
べて支持に対する安定性が優れており、機械的品
質係数Qnの支持による低下が少なく、低損失の
圧電磁器トランスが得られる。 Fourthly, as is well known, torsional oscillators have better stability against support than longitudinal oscillators, and the mechanical quality factor Q n decreases less due to support, resulting in a piezoelectric ceramic transformer with low loss.
次に、第２図に示す本発明の捩りモード圧電磁
器トランスの一実施例として、圧電セラミツク材
料NEPEC−６（k15＝0.68、Qn＝1200）を用い、
長さ36mm、幅10mmで30KHz帯の圧電磁器トランス
を試作し、負荷インピーダンスを2.0MΩとした。
また、第１図に示した従来タイプの圧電磁器トラ
ンスを同じくNEPEC−６（k33＝0.65、k31＝0.30）
で試作し、比較したところ、本発明の圧電磁器ト
ランスは従来の圧電磁器トランスの体積の２分の
１以下になつているにもかかわらず、全く同程度
のパワー伝送特性を示し、昇圧比50以上を安定か
つ容易に得ることができた。また、圧電磁器トラ
ンスの効率の目安となる動作減衰量は、従来の圧
電磁器トランスでは2dB程度あるのに対し、本発
明の圧電磁器トランスは1dB以下を得た。 Next, as an embodiment of the torsion mode piezoelectric ceramic transformer of the present invention shown in FIG. 2, piezoelectric ceramic material NEPEC-6 (k 15 =0.68, Q n =1200) was used.
We prototyped a 30KHz band piezoelectric ceramic transformer with a length of 36mm and a width of 10mm, and the load impedance was set to 2.0MΩ.
In addition, the conventional type piezoelectric ceramic transformer shown in Fig. 1 is also NEPEC-6 (k 33 = 0.65, k 31 = 0.30).
When compared, the piezoelectric ceramic transformer of the present invention showed exactly the same power transmission characteristics as the conventional piezoelectric ceramic transformer, even though it was less than half the volume of the conventional piezoelectric ceramic transformer, and the step-up ratio was 50. The above could be obtained stably and easily. Further, while the operating attenuation amount, which is a measure of the efficiency of a piezoelectric ceramic transformer, is about 2 dB for a conventional piezoelectric ceramic transformer, the piezoelectric ceramic transformer of the present invention has an operating attenuation of 1 dB or less.
尚、本発明の圧電磁器トランスにおいて、第３
図に示すように、底面の電極を共通なアース電極
２７とし、アース端子２８，２８′をとり出した
構成の３端子圧電磁器トランスも、もちろん可能
である。 In addition, in the piezoelectric ceramic transformer of the present invention, the third
As shown in the figure, a three-terminal piezoelectric ceramic transformer having a configuration in which the bottom electrode is a common ground electrode 27 and ground terminals 28 and 28' are taken out is also possible.
以上の実施例から明らかなように、本発明によ
れば、小型で高効率の圧電磁器トランスが実現で
き、工業的価値も多大である。 As is clear from the above embodiments, according to the present invention, a small and highly efficient piezoelectric ceramic transformer can be realized and has great industrial value.
第１図は従来の圧電磁器トランスの構成を示す
斜視図、第２図、第３図は本発明の圧電磁器トラ
ンスの構成を示す斜視図である。
２０，２１は圧電磁器板、２３，２３′，２７
は駆動電極、２４，２４′は発電電極である。
FIG. 1 is a perspective view showing the structure of a conventional piezoelectric ceramic transformer, and FIGS. 2 and 3 are perspective views showing the structure of the piezoelectric ceramic transformer of the present invention. 20, 21 are piezoelectric ceramic plates, 23, 23', 27
is a drive electrode, and 24 and 24' are power generation electrodes.
Claims (1)
磁器板を分極方向が互いに逆向きに、かつ分極方
向に平行な側面で接着し、分割された電極を接着
された圧電磁器板の上面及び下面のそれぞれの厚
み方向に相対向する位置に設け、一方の相対向す
る電極対を駆動電極、他方の相対向する電極対を
発電電極としたことを特徴とする捩りモード圧電
磁器トランス。1. Two piezoelectric ceramic plates that have been polarized in advance in the longitudinal direction are glued together with their polarization directions opposite to each other and on the sides parallel to the polarization direction, and the divided electrodes are attached to each of the top and bottom surfaces of the bonded piezoelectric ceramic plates. 1. A torsional mode piezoelectric ceramic transformer, characterized in that one pair of opposing electrodes is used as a driving electrode, and the other pair of opposing electrodes is used as a power generation electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56032065A JPS57147288A (en) | 1981-03-06 | 1981-03-06 | Twisting mode piezoelectric ceramic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56032065A JPS57147288A (en) | 1981-03-06 | 1981-03-06 | Twisting mode piezoelectric ceramic transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57147288A JPS57147288A (en) | 1982-09-11 |
| JPH02869B2 true JPH02869B2 (en) | 1990-01-09 |
Family
ID=12348473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56032065A Granted JPS57147288A (en) | 1981-03-06 | 1981-03-06 | Twisting mode piezoelectric ceramic transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57147288A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04127486A (en) * | 1990-09-18 | 1992-04-28 | Fujitsu Ltd | Piezoelectric transformer |
| EP0499539B1 (en) * | 1991-02-12 | 1997-10-08 | Fujitsu Limited | Piezoelectric transformer showing a reduced input impedance and step-up/step down operation for a wide range of load resistance |
| US5371430A (en) * | 1991-02-12 | 1994-12-06 | Fujitsu Limited | Piezoelectric transformer producing an output A.C. voltage with reduced distortion |
-
1981
- 1981-03-06 JP JP56032065A patent/JPS57147288A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57147288A (en) | 1982-09-11 |
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