JPH04121072A - Voltage detector of piezoelectric actuator - Google Patents
Voltage detector of piezoelectric actuatorInfo
- Publication number
- JPH04121072A JPH04121072A JP2240954A JP24095490A JPH04121072A JP H04121072 A JPH04121072 A JP H04121072A JP 2240954 A JP2240954 A JP 2240954A JP 24095490 A JP24095490 A JP 24095490A JP H04121072 A JPH04121072 A JP H04121072A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- piezoelectric actuator
- charging
- semiconductor device
- semiconductor element
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000004065 semiconductor Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 abstract 1
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、圧電アクチュエータの電圧検出装置に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a voltage detection device for a piezoelectric actuator.
（従来技術）
圧電アクチュエータは、誘電体である圧電素子とこれを
挟む２つの電極から構成された、一種のコンデンサであ
る。また、圧電アクチュエータの軸線方向の変形量は圧
電アクチュエータに蓄積された電荷に比例する。従って
、圧電アクチュエータの正確な出力変位を得るためには
、圧電アクチュエータに所定の電荷を蓄積させることが
必要である。このような観点から、従来、圧電アクチュ
エータの充電電圧が上記所定の電荷に対応する目標電圧
になっているか否かをチエツクするために、圧電アクチ
ュエータに電圧検出装置を設けたものが知られている。(Prior Art) A piezoelectric actuator is a type of capacitor composed of a dielectric piezoelectric element and two electrodes sandwiching the piezoelectric element. Further, the amount of deformation of the piezoelectric actuator in the axial direction is proportional to the electric charge accumulated in the piezoelectric actuator. Therefore, in order to obtain accurate output displacement of the piezoelectric actuator, it is necessary to accumulate a predetermined charge in the piezoelectric actuator. From this point of view, it is conventionally known to provide a piezoelectric actuator with a voltage detection device in order to check whether the charging voltage of the piezoelectric actuator has reached a target voltage corresponding to the predetermined charge. .
このような従来の圧電アクチュエータの電圧検出装置と
して、第２図に示すように、昇圧回路Ａ′と、圧電アク
チュエータＰＡ’に並列に接続され且つ互いに直列に接
続された第１及び第２の抵抗ｒ１′及びｒ２′から成る
分圧回路Ｂ′と、この分圧回路Ｂ′の第２の抵抗ｒ２′
で分圧した分圧電圧Ｖ２を検出する電圧検出手段Ｖ′と
から構成されたものが知られている。この電圧検出装置
では、第２の抵抗の抵抗値Ｒ１’を第１の抵抗の抵抗値
Ｒ，／よりも極めて小さい適当な値に設定しておくこと
により、分圧電圧Ｖ２を電圧検出手段Ｖ′が検出するの
に適した値とするとともに、これらの値を用い、次式（
１）によって、圧電アクチュエータＰＡ’の充電電圧Ｖ
、が換算される。As shown in FIG. 2, such a conventional piezoelectric actuator voltage detection device includes a booster circuit A' and first and second resistors connected in parallel to the piezoelectric actuator PA' and in series with each other. A voltage dividing circuit B' consisting of r1' and r2', and a second resistor r2' of this voltage dividing circuit B'.
A device is known that includes voltage detection means V' for detecting a divided voltage V2 divided by . In this voltage detection device, by setting the resistance value R1' of the second resistor to an appropriate value that is extremely smaller than the resistance value R,/ of the first resistor, the divided voltage V2 is set to the voltage detection means V ′ is a value suitable for detection, and using these values, the following formula (
1), the charging voltage V of the piezoelectric actuator PA'
, is converted.
Ｖｔ ＝ （１＋Ｒ＋ ’ ／Ｒｚ ’ ）Ｖｔ ・・
（１）（発明が解決しようとする課題）
しかし、この従来の圧電アクチュエータの電圧検出装置
では、圧電アクチュエータが、充電時及び充電完了時か
ら放電時までの電荷保持時も含めて常に分圧回路の抵抗
を介して、図中実線の矢印方向に放電するので、充電時
においては消費電力が大きく充電効率が良くないという
問題があった。Vt = (1+R+'/Rz')Vt...
(1) (Problems to be Solved by the Invention) However, in this conventional voltage detection device for a piezoelectric actuator, the piezoelectric actuator is always connected to a voltage dividing circuit, including during charging and during charge retention from the completion of charging to the time of discharging. Since the battery is discharged in the direction of the solid arrow in the figure through the resistor, there is a problem in that the power consumption is large during charging and the charging efficiency is not good.
このことは、例えば圧電アクチュエータの電源として乾
電池を用いる場合、その寿命を縮める原因になる。また
、電荷保持時においても、同様の理由から、充電電圧を
目標電圧に長時間保持することは困難となる。For example, when a dry cell battery is used as a power source for a piezoelectric actuator, this causes a reduction in its lifespan. Furthermore, during charge retention, it is difficult to maintain the charging voltage at the target voltage for a long period of time for the same reason.
本発明はこのような問題点を解決するためになされたも
のであり、充電時の消費電力か小さく充電効率が良いと
ともに、電荷保持時に充電電圧を目標電圧に長時間保持
することができる圧電アクチュエータの電圧検出装置を
提供することを目的とする。The present invention has been made to solve these problems, and provides a piezoelectric actuator that consumes less power during charging, has high charging efficiency, and can maintain charging voltage at a target voltage for a long time during charge retention. The purpose of the present invention is to provide a voltage detection device.
（課題を解決するための手段）
上記の課題を解決するため、本発明は、圧電アクチュエ
ータを昇圧するための昇圧回路と、圧電アクチュエータ
に並列に接続され且つ互いに直列に接続された第１及び
第２の抵抗から成る分圧回路と、前記第２の抵抗で分圧
した電圧を検出する電圧検出手段とを備えた圧電アクチ
ュエータの電圧検出装置において、前記第１及び第２の
抵抗の間に、前記電圧検出手段による電圧検出時に導通
する半導体素子を設けたものである。(Means for Solving the Problems) In order to solve the above problems, the present invention provides a step-up circuit for boosting the voltage of a piezoelectric actuator, and a first and second circuit connected in parallel to the piezoelectric actuator and connected in series with each other. In the voltage detecting device for a piezoelectric actuator, the voltage detecting device includes a voltage dividing circuit including two resistors, and a voltage detecting means for detecting the voltage divided by the second resistor, between the first and second resistors, A semiconductor element is provided which becomes conductive when the voltage is detected by the voltage detection means.
（作 用）
圧電アクチュエータの充電電圧を検出する時だけ半導体
素子が導通されるので、圧電アクチュエータの充電時及
び電荷保持時に、圧電アクチュエータが半導体素子を介
して放電することはほとんどない。(Function) Since the semiconductor element is made conductive only when detecting the charging voltage of the piezoelectric actuator, the piezoelectric actuator is almost never discharged via the semiconductor element when the piezoelectric actuator is charged or holds charge.
（実施例）
以下、添付の図面に基づいて、本発明の詳細な説明する
。(Example) Hereinafter, the present invention will be described in detail based on the accompanying drawings.
第１図において、ＰＡは圧電アクチュエータ、１は本発
明の実施例に係る圧電アクチュエータＰＡの電圧検出装
置である。電圧検出装置１は、圧電アクチュエータＰＡ
に接続された、例えば公知のフライバック方式の昇圧回
路Ａと、圧電アクチュエータに並列に接続され且つ互い
に直列に接続された第１及び第２の抵抗ｒ１及びｒ２、
及びこの両抵抗の間に介装された、例えばＩＧＥＴ（Ｍ
ＢＴ） 、ＭＯ８形ＦＥＴやトランジスタ等から成る半
導体素子Ｑを備えた分圧回路Ｂと、前記第２の抵抗ｒ２
で分圧した電圧Ｖ２を検出する電圧検出手段Ｖとから構
成されている。上記半導体素子Ｑは電圧検出手段Ｖによ
って電圧ｖ２を検出する時だけ導通されるようになって
いる。In FIG. 1, PA is a piezoelectric actuator, and 1 is a voltage detection device for the piezoelectric actuator PA according to an embodiment of the present invention. The voltage detection device 1 includes a piezoelectric actuator PA
For example, a known flyback booster circuit A is connected to the piezoelectric actuator, and first and second resistors r1 and r2 are connected in parallel to the piezoelectric actuator and in series with each other.
For example, an IGET (M
BT), a voltage dividing circuit B including a semiconductor element Q consisting of an MO8 type FET, a transistor, etc., and the second resistor r2.
and a voltage detection means V for detecting the voltage V2 divided by . The semiconductor element Q is made conductive only when the voltage detection means V detects the voltage v2.
このように構成された、本実施例に係る圧電アクチュエ
ータの電圧検出装置ｌの作動を以下に説明する。The operation of the voltage detection device 1 for a piezoelectric actuator according to the present embodiment configured as described above will be described below.
圧電アクチュエータＰＡの充電電圧ｖ１を検出する場合
には、半導体素子Ｑを導通させて、電圧検出手段Ｖによ
り第２の抵抗ｒ２の分圧電圧ｖ２を検出する。このとき
の充電電圧Ｖ１は、第１及び第２の抵抗ｒ１及びｒ２の
抵抗値をそれぞれＲ及びＲ２、半導体素子Ｑによる電圧
降下をｖＱとすれば、次式（２）によって求めることが
できる。When detecting the charging voltage v1 of the piezoelectric actuator PA, the semiconductor element Q is made conductive, and the voltage detecting means V detects the divided voltage v2 of the second resistor r2. The charging voltage V1 at this time can be determined by the following equation (2), where the resistance values of the first and second resistors r1 and r2 are R and R2, respectively, and the voltage drop due to the semiconductor element Q is vQ.
Ｖｔ ＝ （１＋Ｒ１／Ｒ２）Ｖ２ ＋ＶＱ ・・（
２）半導体素子Ｑによる電圧降下ＶＱ （例えばＩＶ以
下）は一般に、充電電圧Ｖ、（例えば１００ＯＶ）に対
して極めて小さな値であるので、上式（２）において無
視することもできる。Vt = (1+R1/R2)V2 +VQ...(
2) The voltage drop VQ (for example, IV or less) due to the semiconductor element Q is generally an extremely small value with respect to the charging voltage V (for example, 100 OV), so it can be ignored in the above equation (2).
電圧検出手段Ｖによる検出を行わない時は、半導体素子
Ｑを非導通状態にしておく。従って、充電時においては
、圧電アクチュニータＰＡに充電された電荷が半導体素
子Ｑを介して放電することかほとんどないので、消費電
力が小さくし充電効率を向上させることかでき、例えば
乾電池を電源として使用した場合、その寿命を延ばすこ
とかできる。また、電荷保持時においても同様の理由か
ら、電荷保持時に充電電圧を目標電圧に長時間保持する
ことができる。When the voltage detection means V is not performing detection, the semiconductor element Q is kept in a non-conductive state. Therefore, during charging, the electric charge charged in the piezoelectric actunator PA is almost never discharged via the semiconductor element Q, so power consumption can be reduced and charging efficiency can be improved. For example, a dry battery can be used as a power source. If so, you can extend its lifespan. Furthermore, for the same reason during charge retention, the charging voltage can be maintained at the target voltage for a long time during charge retention.
なお、半導体素子Ｑは、非導通状態においても小さなも
れ電流か生じるために放電が若干生ずることは避けられ
ないが、これをできるたけ防止する観点から、上述した
ようなローリーク型の半導体素子を用いるのが有利であ
る。また、電圧検出時の放電量をより小さくするために
、半導体素子Ｑの導通時間をより短くするのが好ましい
。Note that even in a non-conducting state, the semiconductor element Q generates a small leakage current, so it is unavoidable that some discharge occurs, but in order to prevent this as much as possible, a low leakage type semiconductor element as described above is used. It is advantageous to use Further, in order to further reduce the amount of discharge during voltage detection, it is preferable to shorten the conduction time of the semiconductor element Q.
半導体素子Ｑを駆動するためにＩ、を流す場合（トラン
ジスタなど）は、第２の抵抗ｒ２に発生する電圧Ｖ２が
ｒ２Ｘ１．だけ上昇するので、補正する必要がある。Ｍ
Ｏ３形ＦＥＴやＩ ＧＢＴは、電圧駆動素子なのでＩ。When I is applied to drive the semiconductor element Q (such as a transistor), the voltage V2 generated across the second resistor r2 is r2X1. , so it is necessary to correct it. M
O3 type FETs and IGBTs are voltage driven elements, so I.
−０であり、上記補正の必要がなく有利である。-0, which is advantageous since there is no need for the above correction.
半導体素子Ｑの挿入箇所は、第１及び第２の抵抗ｒｌ
ｒ２の間でなくとも、直列であればよい。The insertion point of the semiconductor element Q is the first and second resistor rl.
It does not have to be between r2 as long as it is in series.
ただし、本実か分圧精度及び半導体素子Ｑの面から最も
実用的である。However, it is the most practical in terms of actual voltage division accuracy and semiconductor element Q.
また、放電時は、半導体素子Ｑを駆動すれば、放電回路
としても使用できる。放電速度との兼ね合いにより、第
１及び第２の抵抗ｒ、 ｒ２の分圧比を保ちながら
、全体抵抗ｒ、＋ｒ２を変更すればよい。Further, during discharging, if the semiconductor element Q is driven, it can be used as a discharging circuit. Depending on the balance with the discharge rate, the overall resistances r and +r2 may be changed while maintaining the voltage division ratio of the first and second resistors r and r2.
以上本発明の詳細な説明したが、本発明はこの実施例に
限らず、種々の態様で実施できることは勿論である。Although the present invention has been described in detail above, it goes without saying that the present invention is not limited to this embodiment and can be implemented in various forms.
（発明の効果）
以上説明したように、本発明によれば、圧電アクチュエ
ータの充電電圧を検出する時だけ半導体素子が導通され
るので、圧電アクチュエータの充電時及び電荷保持時に
、圧電アクチュエータが半導体素子を介して放電するこ
とはほとんどなく、従って、充電時の消費電力が小さく
充電効率が良いとともに、電荷保持時に充電電圧を目標
電圧に長時間保持することができる等の効果を奏する。(Effects of the Invention) As explained above, according to the present invention, the semiconductor element is made conductive only when the charging voltage of the piezoelectric actuator is detected. Therefore, power consumption during charging is small and charging efficiency is high, and the charging voltage can be maintained at the target voltage for a long time during charge retention.
第１図は、本発明の実施例に係る圧電アクチュエータの
電圧検出装置の回路図である。
第２図は、従来の圧電アクチュエータの電圧検出装置の
回路図である。
ＰＡ・・・圧電アクチュエータ、
１・・・圧電アクチュエータの電圧検出装置、Ａ・・・
昇圧回路、
Ｂ・・・分圧回路、
ｒｌ ｒ２ ・・・第１及び第２の抵抗、Ｑ・・・半
導体素子、
■・・・電圧検出手段。
第１因
第２図FIG. 1 is a circuit diagram of a voltage detection device for a piezoelectric actuator according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a conventional voltage detection device for a piezoelectric actuator. PA...piezoelectric actuator, 1...voltage detection device for piezoelectric actuator, A...
Boosting circuit, B... Voltage dividing circuit, rl r2... First and second resistors, Q... Semiconductor element, (2)... Voltage detection means. First cause Figure 2
Claims (1)
電アクチュエータに並列に接続され且つ互いに直列に接
続された第１及び第２の抵抗から成る分圧回路と、前記
第２の抵抗で分圧した電圧を検出する電圧検出手段とを
備えた圧電アクチュエータの電圧検出装置において、前
記第１及び第２の抵抗の間に、前記電圧検出手段による
電圧検出時に導通する半導体素子を設けたことを特徴と
する圧電アクチュエータの電圧検出装置。a voltage-dividing circuit consisting of a booster circuit for boosting the voltage of the piezoelectric actuator, a first and a second resistor connected in parallel to the piezoelectric actuator and connected in series with each other, and a voltage divided by the second resistor; A voltage detection device for a piezoelectric actuator comprising a voltage detection means for detecting a piezoelectric actuator, characterized in that a semiconductor element is provided between the first and second resistors, the semiconductor element being conductive when the voltage is detected by the voltage detection means. Actuator voltage detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2240954A JPH04121072A (en) | 1990-09-11 | 1990-09-11 | Voltage detector of piezoelectric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2240954A JPH04121072A (en) | 1990-09-11 | 1990-09-11 | Voltage detector of piezoelectric actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04121072A true JPH04121072A (en) | 1992-04-22 |
Family
ID=17067125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2240954A Pending JPH04121072A (en) | 1990-09-11 | 1990-09-11 | Voltage detector of piezoelectric actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04121072A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077049A1 (en) * | 2012-11-15 | 2014-05-22 | カルソニックカンセイ株式会社 | Voltage measurement circuit |
| CN108604630A (en) * | 2016-01-06 | 2018-09-28 | 波莱特股份有限公司 | Electronic circuit for the charging for controlling piezoelectricity load |
-
1990
- 1990-09-11 JP JP2240954A patent/JPH04121072A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014077049A1 (en) * | 2012-11-15 | 2014-05-22 | カルソニックカンセイ株式会社 | Voltage measurement circuit |
| JP2014098643A (en) * | 2012-11-15 | 2014-05-29 | Calsonic Kansei Corp | Voltage measurement circuit |
| CN104813178A (en) * | 2012-11-15 | 2015-07-29 | 康奈可关精株式会社 | Voltage measurement circuit |
| CN108604630A (en) * | 2016-01-06 | 2018-09-28 | 波莱特股份有限公司 | Electronic circuit for the charging for controlling piezoelectricity load |
| JP2019510451A (en) * | 2016-01-06 | 2019-04-11 | ポライト アーエス | Electronic circuit for controlling the charging of piezoelectric loads |
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