JPH07128085A - Control circuit - Google Patents
Control circuitInfo
- Publication number
- JPH07128085A JPH07128085A JP5276854A JP27685493A JPH07128085A JP H07128085 A JPH07128085 A JP H07128085A JP 5276854 A JP5276854 A JP 5276854A JP 27685493 A JP27685493 A JP 27685493A JP H07128085 A JPH07128085 A JP H07128085A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- circuit
- constant voltage
- power supply
- voltage circuit
- 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
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はセンサからの信号を入力
し、信号処理を行う制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit which receives a signal from a sensor and processes the signal.
【０００２】[0002]
【従来の技術】従来、この種の制御回路では、一つの定
電圧回路を用いてセンサ及びセンサの信号を入力するセ
ンサ入力回路に電源を供給している。2. Description of the Related Art Conventionally, in a control circuit of this type, one constant voltage circuit is used to supply power to a sensor and a sensor input circuit for inputting a sensor signal.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来の制御回路では、センサの故障等により定電圧回路が
アースと短絡状態となった場合には、センサ入力回路に
電源が供給できなくなり、制御回路が停止してしまうと
いう問題がある。そこで、センサ用の定電圧回路とセン
サ入力回路用の定電圧回路とを別構成にすることが考え
られているが、各定電圧回路の電圧変動に起因する入力
誤差が発生してしまい、入力精度が低下してしまうとい
う問題がある。However, in the above-mentioned conventional control circuit, when the constant voltage circuit is short-circuited to the ground due to a sensor failure or the like, power cannot be supplied to the sensor input circuit, and the control circuit cannot be supplied. There is a problem that will stop. Therefore, it is considered to configure the constant voltage circuit for the sensor and the constant voltage circuit for the sensor input circuit separately, but an input error occurs due to the voltage fluctuation of each constant voltage circuit, and There is a problem that the accuracy is reduced.
【０００４】そこで本発明は上記問題に鑑みなされたも
のであって、センサ用の定電圧回路とセンサ入力回路用
の定電圧回路とを別構成とすることで、センサ用の定電
圧回路がアースと短絡状態となってもセンサ入力回路に
電源を供給でき、かつ各用定電圧回路の電圧変動に起因
する入力誤差を防止することができる制御回路を提供す
ることを目的とする。Therefore, the present invention has been made in view of the above problem, and the constant voltage circuit for the sensor and the constant voltage circuit for the sensor input circuit are separately configured so that the constant voltage circuit for the sensor is grounded. It is an object of the present invention to provide a control circuit that can supply power to a sensor input circuit even when a short circuit occurs and that can prevent an input error caused by a voltage fluctuation of each constant voltage circuit.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本発明は、センサと、前記センサに電源電圧を供給する
第１定電圧回路と、前記第１定電圧回路の電源電圧と前
記センサからの信号とを入力して両者の比を演算するセ
ンサ入力回路と、前記センサ入力回路に電圧電源を供給
する第２定電圧回路とを備えたことを特徴とする制御回
路をその要旨とする。To achieve the above object, the present invention comprises a sensor, a first constant voltage circuit for supplying a power supply voltage to the sensor, a power supply voltage of the first constant voltage circuit and the sensor. The control circuit is characterized in that it comprises a sensor input circuit for inputting the signal and the ratio of the two and a second constant voltage circuit for supplying a voltage power supply to the sensor input circuit.
【０００６】[0006]
【作用】上記構成により、本発明では、センサ用の定電
圧回路を第１定電圧回路にて構成し、センサ入力回路用
の定電圧回路を第２定電圧回路にて構成することにな
る。また、センサ入力回路において、第１定電圧回路の
電源電圧とセンサからの信号とを入力して両者の比を演
算しているので、第１定電圧回路の電源電圧の変動に影
響されてセンサの出力信号が変化してもセンサ信号の変
化分は相殺される。With the above structure, in the present invention, the constant voltage circuit for the sensor is composed of the first constant voltage circuit, and the constant voltage circuit for the sensor input circuit is composed of the second constant voltage circuit. Further, in the sensor input circuit, since the power supply voltage of the first constant voltage circuit and the signal from the sensor are input to calculate the ratio of the two, the sensor is affected by the fluctuation of the power supply voltage of the first constant voltage circuit. Even if the output signal changes, the change in the sensor signal is canceled.
【０００７】[0007]
【実施例】以下、本発明の一実施例を図面を用いて詳細
に説明する。図１は本実施例の全体構成を示す電気接続
図である。図１において、定電圧回路１，２はバッテリ
５からの電源供給を受けて定電圧を発生する。すなわ
ち、定電圧回路１はセンサ６用の電源電圧ＶＣＣＳを出
力し、定電圧回路２はセンサ入力回路（Ａ／Ｄコンバー
タ３、ＣＰＵ４）用の電源電圧ＶＣＣを出力する。Ａ／
Ｄコンバータ３はセンサ６からの電圧（アナログ信号）
ＶＳをデジタル値に変換するＩＣであり、ＣＰＵ４はＡ
／Ｄコンバータ３からの信号を入力してプログラミング
された処理を実行するＩＣである。センサ６は、図２に
示すように、外部のセンサ要因（０〜Ａ）に対して、０
〜電源電圧ＶＣＣＳの範囲でリニアに電圧を出力する。
抵抗Ｒ１，Ｒ２はＡ／Ｄコンバータ３への入力電圧がＡ
／Ｄコンバータ３の電源電圧をこえないように、電源電
圧ＶＣＣＳを分割する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an electrical connection diagram showing the overall configuration of this embodiment. In FIG. 1, the constant voltage circuits 1 and 2 receive power supply from a battery 5 and generate a constant voltage. That is, the constant voltage circuit 1 outputs the power supply voltage VCCS for the sensor 6, and the constant voltage circuit 2 outputs the power supply voltage VCC for the sensor input circuit (A / D converter 3, CPU 4). A /
D converter 3 is the voltage from sensor 6 (analog signal)
It is an IC that converts VS into a digital value.
It is an IC that receives signals from the / D converter 3 and executes programmed processing. As shown in FIG. 2, the sensor 6 is 0 for the external sensor factor (0 to A).
Output voltage linearly in the range of power supply voltage VCCS.
The resistors R1 and R2 have an input voltage A to the A / D converter 3 of A.
The power supply voltage VCCS is divided so as not to exceed the power supply voltage of the / D converter 3.
【０００８】次に上記構成を備えた本実施例の作動を説
明する。Ａ／Ｄコンバータ３は、定電圧回路１の電源電
圧ＶＣＣＳの抵抗分割電圧を入力する。そして、以下の
式にてＶＣＣＳのＡ／Ｄ変換値であるＡＤＶＣＣＳを算
出する。Next, the operation of this embodiment having the above configuration will be described. The A / D converter 3 inputs the resistance division voltage of the power supply voltage VCCS of the constant voltage circuit 1. Then, ADVCCS which is the A / D conversion value of VCCS is calculated by the following formula.
【０００９】[0009]
【数１】 ただし、ｎはＡ／Ｄコンバータ３のビット数である。[Equation 1] However, n is the number of bits of the A / D converter 3.
【００１０】また、Ａ／Ｄコンバータ３は、センサ６の
出力電圧ＶＳも入力し、以下の式にてＶＳのＡ／Ｄ変換
値ＡＤＶＳを算出する。The A / D converter 3 also receives the output voltage VS of the sensor 6 and calculates the A / D conversion value ADVS of VS by the following formula.
【００１１】[0011]
【数２】 ＣＰＵ４では、Ａ／Ｄコンバータ３からのＡＤＶＣＣＳ
及びＡＤＶＳを入力して、数１および数２に基づき、以
下の式にて、ＶＳ／ＶＣＳＳの比のＡ／Ｄ値をセンサ出
力値ＶＯＵＴとする。[Equation 2] In the CPU 4, the ADVCCS from the A / D converter 3
And ADVS are input, and the A / D value of the VS / VCSS ratio is set as the sensor output value VOUT by the following equation based on the equations 1 and 2.
【００１２】[0012]
【数３】 従来では、数２にて示されるＡＤＶＳをセンサ出力値と
していたので、電源電圧ＶＣＣと電源電圧ＶＣＣＳとの
差が入力精度に影響を与えていた。[Equation 3] Conventionally, since the ADVS expressed by the equation 2 is used as the sensor output value, the difference between the power supply voltage VCC and the power supply voltage VCCS affects the input accuracy.
【００１３】これに対し本実施例では、センサ出力値Ｖ
ＯＵＴを求める際に、センサ６の出力電圧ＶＳを電源電
圧ＶＣＣＳで除算しているので、電源電圧ＶＣＣＳの電
圧変動に起因してセンサ６の出力電圧ＶＳが変化して
も、電源電圧ＶＣＣＳの電圧変動に起因する変化分を相
殺することができる。従って、本実施例では、電源電圧
ＶＣＣと電源電圧ＶＣＣＳとの差がどのような値であろ
うともその差を補正し、各定電圧回路の電圧変動に起因
する入力誤差をなくすことができる。On the other hand, in this embodiment, the sensor output value V
Since the output voltage VS of the sensor 6 is divided by the power supply voltage VCCS when OUT is calculated, even if the output voltage VS of the sensor 6 changes due to the voltage fluctuation of the power supply voltage VCCS, the voltage of the power supply voltage VCCS is changed. The change caused by the fluctuation can be canceled out. Therefore, in this embodiment, no matter what value the difference between the power supply voltage VCC and the power supply voltage VCCS is, the difference can be corrected and the input error caused by the voltage fluctuation of each constant voltage circuit can be eliminated.
【００１４】なお、本発明は上記実施例に限定されるも
のではなく、例えば、センサ信号既知の時の値をデジタ
ル値で保持する構成を組み込み、この情報と各時点での
センサ信号のデジタル値を比較することで、センサの入
力信号を安定化させるようにしても良い。The present invention is not limited to the above-described embodiment. For example, a structure for holding the value when the sensor signal is known as a digital value is incorporated, and this information and the digital value of the sensor signal at each time point are incorporated. The input signal of the sensor may be stabilized by comparing
【００１５】[0015]
【発明の効果】以上説明したように本発明によれば、セ
ンサ用の定電圧回路を第１定電圧回路にて構成し、セン
サ入力回路用の定電圧回路を第２定電圧回路にて構成し
ているので、センサ用の定電圧回路がアースと短絡状態
となってもセンサ入力回路に電源を供給できるという効
果がある。また、第１定電圧回路の電源電圧の変動に影
響されてセンサの出力信号が変化してもセンサ信号の変
化分は相殺されるので、各定電圧回路の電圧変動に起因
する入力誤差をなくすことができるという効果がある。As described above, according to the present invention, the constant voltage circuit for the sensor is composed of the first constant voltage circuit, and the constant voltage circuit for the sensor input circuit is composed of the second constant voltage circuit. Therefore, there is an effect that power can be supplied to the sensor input circuit even when the constant voltage circuit for the sensor is short-circuited to the ground. Further, even if the output signal of the sensor changes due to the fluctuation of the power supply voltage of the first constant voltage circuit, the change of the sensor signal is canceled, so that the input error caused by the voltage fluctuation of each constant voltage circuit is eliminated. The effect is that you can.
【図１】一実施例の全体構成を示す電気接続図である。FIG. 1 is an electrical connection diagram showing an overall configuration of an embodiment.
【図２】センサの出力電圧を示す特性図である。FIG. 2 is a characteristic diagram showing an output voltage of a sensor.
１，２ 定電圧回路 ３ Ａ／Ｄコンバータ ４ ＣＰＵ ５ バッテリ ６ センサ 1, 2 constant voltage circuit 3 A / D converter 4 CPU 5 battery 6 sensor
Claims (1)
とを入力して両者の比を演算するセンサ入力回路と、 前記センサ入力回路に電圧電源を供給する第２定電圧回
路と、 を備えたことを特徴とする制御回路。1. A sensor, a first constant voltage circuit that supplies a power supply voltage to the sensor, a sensor that inputs a power supply voltage of the first constant voltage circuit and a signal from the sensor, and calculates a ratio of the two. A control circuit comprising: an input circuit; and a second constant voltage circuit that supplies a voltage power supply to the sensor input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5276854A JPH07128085A (en) | 1993-11-05 | 1993-11-05 | Control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5276854A JPH07128085A (en) | 1993-11-05 | 1993-11-05 | Control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07128085A true JPH07128085A (en) | 1995-05-19 |
Family
ID=17575340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5276854A Pending JPH07128085A (en) | 1993-11-05 | 1993-11-05 | Control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07128085A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007240286A (en) * | 2006-03-08 | 2007-09-20 | Yokogawa Electric Corp | Measuring method and measuring instrument |
| JP2008157966A (en) * | 2008-02-19 | 2008-07-10 | Denso Corp | Sensor device |
-
1993
- 1993-11-05 JP JP5276854A patent/JPH07128085A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007240286A (en) * | 2006-03-08 | 2007-09-20 | Yokogawa Electric Corp | Measuring method and measuring instrument |
| JP2008157966A (en) * | 2008-02-19 | 2008-07-10 | Denso Corp | Sensor device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20021008 |