JPS6358218A - Load detecting circuit - Google Patents
Load detecting circuitInfo
- Publication number
- JPS6358218A JPS6358218A JP20291286A JP20291286A JPS6358218A JP S6358218 A JPS6358218 A JP S6358218A JP 20291286 A JP20291286 A JP 20291286A JP 20291286 A JP20291286 A JP 20291286A JP S6358218 A JPS6358218 A JP S6358218A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- bridge
- resistor
- bridge balance
- input terminal
- 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 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 241000631130 Chrysophyllum argenteum Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement Of Force In General (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ロードセル式電子秤等に適用される荷重検出
回路に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a load detection circuit applied to a load cell type electronic scale or the like.
（従来技術）
近年、電子回路を用いて計着する方式の秤が実用化され
ているが、この種の電子回路を用いた計；五装置は、波
計ＩＪ物の荷重による歪によって抵°抗値が変化する歪
ゲージを起歪体に貼り付けたロードセルを使用している
。そして、該ロードセルから出力されるアナログの計せ
信号を増幅し、この信号を−ｌ、アナログーデジタル変
換器でデジタルイー目こ変換後１表示装置に表示せしめ
るような構成を有する。(Prior art) In recent years, scales that use electronic circuits for measurement have been put into practical use. It uses a load cell with a strain gauge that changes resistance value attached to a strain body. The analog measurement signal outputted from the load cell is amplified, and this signal is converted to digital by an analog-to-digital converter and then displayed on a display device.
第３図は、起歪体に４枚の歪ゲージＲａ、Ｒｈを取付け
たロードセル式電子秤の荷重検出回路の例である。ロー
ドセルＡは、歪ゲージＲａ、Ｒｈをブリッジ回路に形成
し、起歪体の温度補償抵抗Ｒ，を励起電源Ｖｅｘおよび
アース端子ＧＮＤとブリッジ回路の入力端子との間に接
続して構成される。基板Ｃは、差動増幅器ａ、フィルタ
ｂ、 Ａ／ＤコンバータＣにより構成され、差動増幅器
の反転入力端子と出力側との間にはフィードバック抵抗
Ｒ１を接続する。また、ロードセルとノＳ板との間はケ
ーブルＢにより接続する。基板Ｃの出力側には、テンキ
ーＤ、ＣＰＵＥ、表示器Ｆを配置する・
（発明が解決しようとする問題点）
このように、歪ゲージをブリッジ回路に形成する場合に
は、ブリッジ回路のバランスを取るために、ロードセル
の個々の歪ゲージにおいて抵抗値を調整しなければなら
ず、その操作が煩雑になるという問題があった。また、
起歪体に付加される計量１１１１等の初期荷重による出
力を打消すために、ロードセルの出力側に接続される基
板側の回路に調整抵抗Ｒｖを別個に設ける必要があり、
回路構成が複雑になるという問題があった。FIG. 3 is an example of a load detection circuit of a load cell type electronic scale in which four strain gauges Ra and Rh are attached to a strain body. The load cell A is configured by forming strain gauges Ra and Rh into a bridge circuit, and connecting a temperature compensating resistor R, which is a flexure element, between an excitation power source Vex and a ground terminal GND, and an input terminal of the bridge circuit. The substrate C is composed of a differential amplifier a, a filter b, and an A/D converter C, and a feedback resistor R1 is connected between the inverting input terminal and the output side of the differential amplifier. Further, a cable B is used to connect the load cell and the S plate. On the output side of the board C, a numeric keypad D, a CPU, and a display F are arranged. In order to obtain this, it is necessary to adjust the resistance value of each strain gauge of the load cell, which poses a problem in that the operation becomes complicated. Also,
In order to cancel the output due to the initial load such as the metering 1111 added to the strain body, it is necessary to separately provide an adjustment resistor Rv in the circuit on the board side connected to the output side of the load cell.
There was a problem that the circuit configuration became complicated.
そこで、本発明はこのような従来技術の問題点の解消を
目的として、ブリッジバランスの調整と、初期荷重出力
の調整を共通の抵抗で行なうことにより回路構成を簡単
にした。荷重検出回路を提供するものである。Therefore, in order to solve the problems of the prior art, the present invention simplifies the circuit configuration by using a common resistor to adjust the bridge balance and the initial load output. A load detection circuit is provided.
（間ｍ点を解決するための手段）
本発明においては、ロードセルの起歪体の所定個所に貼
り付けた歪ゲージによりブリッジ回路を形成すると共に
、ブリッジ回路の一辺をブリッジ一−
／＜ランス調整用抵抗と歪ゲージの直列回路により形成
し、前記ブリッジバランス調整用抵抗に並列に可変抵抗
を接続し、該可変抵抗の可動接点を反転増幅Ｆｊｌ路の
非反転入力端子に接続し、反転増幅回路の反転入力端子
には上記ブリッジ回路の他方出力端子を直接に、または
、起歪体の温度補償抵抗を介して接続したことを特徴と
する荷重検出回路が提供される。(Means for solving the gap between m points) In the present invention, a bridge circuit is formed by a strain gauge attached to a predetermined location of a strain body of a load cell, and one side of the bridge circuit is connected to the bridge 1 - /< lance adjustment. A variable resistor is connected in parallel to the bridge balance adjusting resistor, and a movable contact of the variable resistor is connected to a non-inverting input terminal of an inverting amplification Fjl path. There is provided a load detection circuit characterized in that the other output terminal of the bridge circuit is connected to the inverting input terminal of the bridge circuit either directly or via a temperature compensating resistor of a strain body.
（作用）
本発明は、歪ゲージにより形成されるブリッジ回路の一
辺に、歪ゲージと直列にブリッジバランス３Ｊ幣用抵抗
を接続すると共に、その調整用抵抗に並列に可変抵抗を
接続し、さらに該可変抵抗の可動接点を反転増幅回路の
非反転入力端子に接続したので、１つの可変抵抗の調整
でブリ・２シバランスの調整と初期荷重出力の調整とを
併せて行うことができると共に、コストを低減すること
ができる。(Function) The present invention connects a bridge balance 3J resistor in series with the strain gauge to one side of the bridge circuit formed by the strain gauge, and connects a variable resistor in parallel to the adjustment resistor. Since the movable contact of the variable resistor is connected to the non-inverting input terminal of the inverting amplifier circuit, it is possible to adjust the briss balance and the initial load output at the same time by adjusting one variable resistor, while also reducing costs. can be reduced.
（実施例）
以ド１図により本発明の実施例について説明する。第１
図は本発明の第１の実施例の回路図である０図に、おい
て、ロードセルのブリッジ回路の一辺に、歪ゲージと直
列にブリフジバランス調整用抵抗Ｒｇを接続し、そのブ
リッジバランス調１用抵抗と被タダに５Ｔ変抵抗Ｒｅを
接続する。可変抵抗の可動接点は反転増幅回路ａの非反
転入力端子に接続される。ブリッジバランス調整用抵抗
Ｒｇは、例えば金属皮膜等からなる数Ω程度の小抵抗を
起歪体に取付けたものであるのに対し、可ｆ抵抗Ｒｅは
、Ｒｇの数十倍の抵抗値を有したもので、この抵抗Ｒｅ
とブリー、シバランス調整用抵抗Ｒｇとの作用により、
ブリッジバランスを所定に調整できるようにｙれている
。その他の回路構成は第３図の従来例と同様であるので
、詳細な説明は省略する。(Example) An example of the present invention will be described below with reference to FIG. 1st
Figure 0 is a circuit diagram of the first embodiment of the present invention, in which a bridge balance adjustment resistor Rg is connected in series with the strain gauge to one side of the bridge circuit of the load cell, and the bridge balance adjustment is performed. A 5T variable resistor Re is connected between the resistor for 1 and the resistor. The movable contact of the variable resistor is connected to the non-inverting input terminal of the inverting amplifier circuit a. The bridge balance adjustment resistor Rg is a small resistor of several Ω made of, for example, a metal film attached to a flexure element, whereas the flexible resistor Re has a resistance value several tens of times that of Rg. and this resistance Re
By the action of Brie and balance adjustment resistor Rg,
It is designed so that the bridge balance can be adjusted to a specified value. The rest of the circuit configuration is the same as that of the conventional example shown in FIG. 3, so detailed explanation will be omitted.
第２図は、本発明の第２の実施例の回路図である。第２
の実施例においては、起歪体の温度補償抵抗Ｒ８は、ブ
リッジ回路の一方出方端子と、反転増幅回路の反転入力
端子との間に１個のみ設けて、温度補償抵抗の個数を減
少させ、部品コストの低減および！Ａ１１ｔ Ｉ＝程の
簡略化を図るものである。その他の構成はｉ、１’Ｓ
ｌの実施例と同様である。FIG. 2 is a circuit diagram of a second embodiment of the invention. Second
In this embodiment, only one temperature compensating resistor R8 of the strain body is provided between one output terminal of the bridge circuit and the inverting input terminal of the inverting amplifier circuit to reduce the number of temperature compensating resistors. , reduced parts costs and! This is intended to simplify the process to the extent that A11t I=. Other configurations are i, 1'S
This is similar to the embodiment 1.
（９：、明の効果）
以１−説明したように１本発明はロードセル式電ｒ行等
に適用される荷重検出回路において、歪ゲージで構成さ
れるブリッジ回路の一辺に、プリンシバランス調整用抵
抗を歪ゲージと直列に接続すると共に、前記プリｌシバ
ランス調整用抵抗に並夕ｑにｉｉ）変抵抗を接続し、該
可変抵抗のＩＩ）動接点を工乏軌増幅回路の非反転入力
端子に接続しているので、ブリッジバランスの調整と、
初期荷重出力の調整とを共通の抵抗により行なえシゆ糟
、回路構成が簡単になり、操作も簡略化される。(9: Effect of light) As explained in 1-1, the present invention is a load detection circuit applied to a load cell type electric R row, etc., in which a bridge circuit composed of a strain gauge is provided with a principle balance adjustment device on one side of the bridge circuit. A resistor is connected in series with the strain gauge, and ii) a variable resistor is connected in parallel to the pre-I balance adjustment resistor, and the dynamic contact of the variable resistor is connected to the non-inverting input of the poor track amplifier circuit. Since it is connected to the terminal, you can adjust the bridge balance,
Since the initial load output can be adjusted using a common resistor, the circuit configuration is simplified and the operation is also simplified.
【図面の簡単な説明】
第１図は本発明の第１の実施例の回路図、第２図は本発
明の第２の実施例の回路図、：ｔ’５３１Δは従来例の
回路図である。
Ａ・・・ロードセル、Ｂ・・・ケーブル、Ｃ・・・ノ、
（板、Ｄ・・・テンキー、Ｅ・・・ＣＰＵ、Ｆ・・・表
示器、Ｒｇ・・・ブリッジバランス調整用抵抗、Ｒｅ・
・・可変抵抗。[Brief Description of the Drawings] Fig. 1 is a circuit diagram of a first embodiment of the present invention, Fig. 2 is a circuit diagram of a second embodiment of the present invention, and t'531Δ is a circuit diagram of a conventional example. be. A... Load cell, B... Cable, C... ノ,
(Board, D...numeric keypad, E...CPU, F...display, Rg...bridge balance adjustment resistor, Re...
...Variable resistance.
Claims (1)
よりブリッジ回路を形成すると共に、ブリッジ回路の一
辺をブリッジバランス調整用抵抗と歪ゲージの直列回路
により形成し、前記ブリッジバランス調整用抵抗に並列
に可変抵抗を接続し、該可変抵抗の可動接点を反転増幅
回路の非反転入力端子に接続し、反転増幅回路の反転入
力端子には上記ブリッジ回路の他方出力端子を直接に、
または、起歪体の温度補償抵抗を介して接続したことを
特徴とする、荷重検出回路。A bridge circuit is formed by a strain gauge attached to a predetermined location on the strain body of the load cell, and one side of the bridge circuit is formed by a series circuit of a bridge balance adjustment resistor and a strain gauge, and is parallel to the bridge balance adjustment resistor. A variable resistor is connected to, a movable contact of the variable resistor is connected to a non-inverting input terminal of an inverting amplifier circuit, and the other output terminal of the bridge circuit is directly connected to the inverting input terminal of the inverting amplifier circuit.
Alternatively, a load detection circuit is characterized in that it is connected via a temperature compensation resistor of a strain body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20291286A JPS6358218A (en) | 1986-08-29 | 1986-08-29 | Load detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20291286A JPS6358218A (en) | 1986-08-29 | 1986-08-29 | Load detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6358218A true JPS6358218A (en) | 1988-03-14 |
Family
ID=16465227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20291286A Pending JPS6358218A (en) | 1986-08-29 | 1986-08-29 | Load detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6358218A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009156658A (en) * | 2007-12-26 | 2009-07-16 | Renesas Technology Corp | Semiconductor pressure sensor device, data processing device, manometer, vacuum cleaner, and barometer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144326A (en) * | 1984-08-08 | 1986-03-04 | Ishida Scales Mfg Co Ltd | Load detector of load-cell type electronic scale |
-
1986
- 1986-08-29 JP JP20291286A patent/JPS6358218A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6144326A (en) * | 1984-08-08 | 1986-03-04 | Ishida Scales Mfg Co Ltd | Load detector of load-cell type electronic scale |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009156658A (en) * | 2007-12-26 | 2009-07-16 | Renesas Technology Corp | Semiconductor pressure sensor device, data processing device, manometer, vacuum cleaner, and barometer |
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