JPS6111824A - Voltage/current converter - Google Patents
Voltage/current converterInfo
- Publication number
- JPS6111824A JPS6111824A JP13168984A JP13168984A JPS6111824A JP S6111824 A JPS6111824 A JP S6111824A JP 13168984 A JP13168984 A JP 13168984A JP 13168984 A JP13168984 A JP 13168984A JP S6111824 A JPS6111824 A JP S6111824A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- signal
- output
- voltage signal
- 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
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、寸イクロコンピュータによシ構成され自己診
゛断機能を備えた調節計等に設けられる電圧−電流変換
装置に関する。。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a voltage-to-current converter installed in a controller or the like which is constructed using a microcomputer and has a self-diagnosis function. .
第３図は従来の電圧−電流変換回路の回路構成図である
。この電圧−電流変換回路は、例えばプ四セス制御装置
における調節計内に設けられ制御信号や操作信号等の電
圧信号を遠隔地の監視所などに伝送するために電流信号
に変換するものである。具体的に説明すると、入力端１
００に制御信号等の電圧信号ｖ４が加わると、この信号
ｖ４は抵抗１０１ｆ、介して演算増幅器（以下、オペア
ンプと称す）１０２の反転入力端子に入力する。すると
、オペアンプ１０２の出力端子からは、ヒの電圧信号と
、非反転入力端子に入力する直流電源電圧Ｖが抵抗１０
３゜１０４から成る抵抗分圧回路によシ分圧された分圧
電圧信号との差電圧信号が出力される。この差電圧信号
はツェナダイオ−Ｆ′１０５を介してダーリントン接続
されたトランジスタ１０６゜１０７の一方のトランジス
タ１０６０ペース端子に加わる。これによシ、トランジ
スタ１０６゜１０７は共に導通状態となシ、直流電源か
ら抵抗１０８、トランジスタｘｏｅ、ｉｏｖを通って監
視所等の負荷１０９に電圧信号ＶＩＮに比例した比較的
大きな電流信号が流れる。このとき、抵抗１０８に現わ
・れる電圧降下によｊｏ）ランジスタ１０１のコレクタ
端子とオペアンプ１０２１０１に流れる電流と等くなる
。このように、抵抗１０１と１１０に流れる電流が等し
くなるように動作して電圧信号ＶＩＮに比例した電流信
号ｒｏが出力される。なお、抵抗１１１とツェナダイオ
−トノ０５とは、オペアンプ１０２の出力が零デルト近
くまで降下しないようレベルシフトして補正ヲ唇なって
いる。FIG. 3 is a circuit diagram of a conventional voltage-current conversion circuit. This voltage-current conversion circuit is installed, for example, in a controller in a controller and converts voltage signals such as control signals and operation signals into current signals for transmission to remote monitoring stations. . To explain specifically, input terminal 1
When a voltage signal v4 such as a control signal is applied to 00, this signal v4 is input to the inverting input terminal of an operational amplifier (hereinafter referred to as an operational amplifier) 102 via a resistor 101f. Then, from the output terminal of the operational amplifier 102, the voltage signal H and the DC power supply voltage V input to the non-inverting input terminal are connected to the resistor 10.
A difference voltage signal between the divided voltage signal and the divided voltage signal divided by the resistive voltage divider circuit consisting of 3.degree. 104 is output. This differential voltage signal is applied to one of the Darlington connected transistors 106, 107 through the Zener diode F' 105 to the transistor 1060 pace terminal. As a result, both transistors 106 and 107 are in a conductive state, and a relatively large current signal proportional to the voltage signal VIN flows from the DC power supply through the resistor 108 and the transistors xoe and iov to the load 109 such as a monitoring station. . At this time, due to the voltage drop appearing across the resistor 108, the current flowing through the collector terminal of the transistor 101 and the operational amplifier 102101 becomes equal. In this way, the currents flowing through the resistors 101 and 110 are made equal, and a current signal ro proportional to the voltage signal VIN is output. Note that the resistor 111 and the Zener diode 05 perform a level shift and correction so that the output of the operational amplifier 102 does not drop to near zero delt.
ところで、以上のような変換回路の異常出力の診断は、
第４図に示すように別途電流検出回路１２０を設けて行
なっていた。すなわち、トランジスタ１θ６，１０’７
のコレクタ端子に電流検出用抵抗１２１を接続し、この
抵抗１２１の両端に現われる電圧がそれぞれバッファア
ンプ１２２，１２３、抵抗１２４，１２５を介して差動
増幅器１２６の各入力端子に入力するように構成する。By the way, diagnosis of the abnormal output of the conversion circuit as described above is as follows.
As shown in FIG. 4, a separate current detection circuit 120 was provided. That is, transistors 1θ6, 10'7
A current detection resistor 121 is connected to the collector terminal of the resistor 121, and the voltage appearing across the resistor 121 is configured to be input to each input terminal of a differential amplifier 126 via buffer amplifiers 122, 123 and resistors 124, 125, respectively. do.
そして、との差動増幅器１２６には、抵抗１２７を介し
て入力コモン１２８の電圧が加わってお）、差動増幅器
１２６からは、入力コモン電圧を基準とした電圧信号を
出力する。そうして、との差動増幅器１２６から出力さ
れた電圧信号と前記電圧信号ｖＩＮとが異常診断回路１
３０によシ比較され異常有無の判断が行なわれる。もし
、異常有シと診断されれば調節計の制御部にその旨が伝
えられる。The voltage of the input common 128 is applied to the differential amplifier 126 via the resistor 127), and the differential amplifier 126 outputs a voltage signal based on the input common voltage. Then, the voltage signal output from the differential amplifier 126 and the voltage signal vIN are connected to the abnormality diagnostic circuit 1.
30, and it is determined whether or not there is an abnormality. If it is diagnosed that there is an abnormality, that fact is notified to the controller's control section.
以上のように異常出力を検出する場合は、別途電流検出
回路１２０を設けなければならず、そのうえ電圧−電流
変換回路の全体の構成が複雑に表ってしまう。しかして
、電流検出回路１２０に故障が発生した場合、正常に電
圧−電流変換動作しているのにかかわらず誤診断する。When detecting an abnormal output as described above, it is necessary to separately provide the current detection circuit 120, and furthermore, the overall configuration of the voltage-current conversion circuit becomes complicated. Therefore, when a failure occurs in the current detection circuit 120, a misdiagnosis is made even though the voltage-to-current conversion operation is normal.
恐れが多分にあった。また、変換回路の出力端に電流検
出用抵抗１２１を接続することになるので、負荷抵抗１
０９の大きなものにも適用できないという問題がある。There was a lot of fear. Also, since the current detection resistor 121 is connected to the output terminal of the conversion circuit, the load resistor 1
There is a problem that it cannot be applied even to large size 09.
本発明は上記実情に基づいてなされたもので、その目的
とするところは、構成を簡単にして確実に異常出力を診
断でき、かつ大きな負荷抵抗にも適用できる信頼性の高
い電圧−電流変換装置を提供することにある。The present invention has been made based on the above-mentioned circumstances, and its purpose is to provide a highly reliable voltage-current converter that has a simple configuration, can reliably diagnose abnormal output, and can also be applied to large load resistances. Our goal is to provide the following.
本発明は、入力電圧信号に比例した電流信号に変換する
電圧−電流変換回路から出力される電流信号を出力電流
検出回路によシ検出し、かつこの電流信号を電圧信号忙
変換して前記電圧−電流変換回路にフィードバックし、
このフィードバックとともに前記出力電流検出回路から
出力された電圧信号と前記電圧−電流変換回路の入力電
圧信号とを異常診断回路によシ比較し、その差が所定値
以上の場合に前記電圧−電流変換回路が入力電圧信号に
比例した電流信号に変換していないと診断する電圧−電
流変換装置である。The present invention detects a current signal outputted from a voltage-current conversion circuit that converts an input voltage signal into a current signal proportional to an input voltage signal using an output current detection circuit, converts this current signal into a voltage signal, and converts the current signal into a current signal proportional to the input voltage signal. - Feedback to the current conversion circuit,
Along with this feedback, the voltage signal output from the output current detection circuit and the input voltage signal of the voltage-current conversion circuit are compared by the abnormality diagnosis circuit, and if the difference is greater than a predetermined value, the voltage-current conversion circuit This is a voltage-current converter that diagnoses that a circuit is not converting an input voltage signal into a proportional current signal.
、〔発明の実施例〕
以下、本発明に係る電圧−電流変換装置の一実施例につ
いて第１図を参照して説明する。第１図は電圧−電流変
換装置の構成図である。入力端子１が演算増幅器（以下
、オ（アンプと称す）ＡＪの非反転入力端子に接続され
、このオペアンｆＡ１の出力端が電流増幅用トランジス
タＱのペース端子に接続されて電圧−電流変換回路が構
成、されている。なお、トランジスタＱのコレクタ端子
には直流電源Ｖｏが接続されている。, [Embodiment of the Invention] Hereinafter, an embodiment of the voltage-current converter according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a voltage-current converter. The input terminal 1 is connected to the non-inverting input terminal of an operational amplifier (hereinafter referred to as amplifier) AJ, and the output terminal of this operational amplifier fA1 is connected to the pace terminal of a current amplification transistor Q to form a voltage-current conversion circuit. Note that the collector terminal of the transistor Q is connected to a DC power source Vo.
さて、前記電流増幅用トランジスタＱのエミッタ端子と
前記オペアン７’ＡＩの反転入力端子との間には、出力
電流検出回路１０が接続されている。この出力電流検出
回路１０は、トランジスタＱの工５ツタに流れる電流つ
まシミ圧−電流変換回路としての出力電流を検出し、こ
の出力電流を入力電圧信号Ｖユと同一レベルの電圧信号
に変換してオペアンプＡ１にフィードバックするととも
に、異常診断回路２０に出力する機能をもったものであ
る。具体的な構成は次のようである。すなわち、トラン
ジスタＱのエミッタ端子に電流−電圧変換用抵抗Ｒ７が
接続され、この抵抗Ｒｆの両端にそれぞれインピーダン
ス変換用としてのバッファアンプＢＡＩ、ＢＡ２の各非
反転入力端子が接続されている。そして、これらバッフ
ァアンプＢＡＩ 、ＢＡ、？の出力端が各抵抗Ｒ１，Ｒ
２′ｔ−介して差動増幅器Ａ２の非反転入力端子、反転
入力端子に接続され、との差動増幅器Ａ２の出力端がオ
ペアンプＡ１の反転入力端子に接続されている。そうし
て、差動増幅器Ａ２の非反転入、力端子は、抵抗Ｒ３ｆ
介して入力コモン端子２・の電位と同一レベルのライン
１１に接続されている。また、差動増幅器Ａ２の反転入
力端子と出力端との間に抵抗Ｒ４が接続されている。Now, an output current detection circuit 10 is connected between the emitter terminal of the current amplifying transistor Q and the inverting input terminal of the operational amplifier 7'AI. This output current detection circuit 10 detects the output current flowing through the terminals of the transistor Q as a voltage-to-current conversion circuit, and converts this output current into a voltage signal at the same level as the input voltage signal V. It has the function of feeding back to the operational amplifier A1 and outputting to the abnormality diagnosis circuit 20. The specific configuration is as follows. That is, a current-voltage conversion resistor R7 is connected to the emitter terminal of the transistor Q, and each non-inverting input terminal of a buffer amplifier BAI, BA2 for impedance conversion is connected to both ends of this resistor Rf. And these buffer amplifiers BAI, BA, ? The output terminal of each resistor R1, R
The output terminal of the differential amplifier A2 is connected to the inverting input terminal of the operational amplifier A1. Then, the non-inverting input and output terminal of the differential amplifier A2 is connected to the resistor R3f.
It is connected to a line 11 whose potential is the same as that of the input common terminal 2. Further, a resistor R4 is connected between the inverting input terminal and the output terminal of the differential amplifier A2.
異常診断回路２０は、出力電流検出回路１０から出力さ
れる電圧信号と入力電圧信号ＶＩＮとを比較し、その電
圧差が所定値よシも大きくなった場合に電圧−電流変換
回路が電圧信号ｖ４に比例した電流信号工◎を出力して
いないと、診断して異常診断信号２０ｍ−を出力する機
能をもったものである。The abnormality diagnosis circuit 20 compares the voltage signal outputted from the output current detection circuit 10 and the input voltage signal VIN, and when the voltage difference becomes larger than a predetermined value, the voltage-current conversion circuit converts the voltage signal v4 It has a function of diagnosing and outputting an abnormality diagnosis signal 20m- if the current signal ◎ proportional to ◎ is not output.
なお、オペアンプＡ１の反転入力端子と出力端との間に
接続されたコンデンサＣは、フィードバックによる位相
のずれを補正して発振を防止するものであシ、またＲＬ
は負荷抵抗である。Note that the capacitor C connected between the inverting input terminal and the output terminal of the operational amplifier A1 corrects the phase shift caused by feedback to prevent oscillation.
is the load resistance.
次に上記の如く構成された装置の動作について説明する
。電圧信号ｖ４が入力端１からオペアン７″八１の非反
転入力端子に加わると、オペアンｆＡ１の出力端からは
電圧信号ＶＩＮに比例した電圧が出力され、これによ）
トランジスタＱが導通して電流−電圧変換用抵抗Ｒｆｆ
：通して負荷抵抗ＲＬに電流が流れる。このとき流れる
電流によシミ流−電圧変換用抵抗Ｒｆの両端に電圧降下
ｖｆが現われる。この電圧降下Ｖｆは各インピーダンス
変換用のバッファアンプＢＡＩ、ＢＡ２を介して差動増
幅器Ａの各入力端子に送られる。Next, the operation of the apparatus configured as described above will be explained. When the voltage signal v4 is applied from the input terminal 1 to the non-inverting input terminal of the operational amplifier fA1, a voltage proportional to the voltage signal VIN is output from the output terminal of the operational amplifier fA1.
Transistor Q becomes conductive and current-voltage conversion resistor Rff
: Current flows through the load resistor RL. Due to the current flowing at this time, a voltage drop vf appears across the stain current/voltage conversion resistor Rf. This voltage drop Vf is sent to each input terminal of the differential amplifier A via each impedance conversion buffer amplifier BAI, BA2.
そこで、差動増幅器Ａ２の非反転入力端子は入力コモン
ライン１１に接続されているので、との差動増幅器Ａか
らは入力コモンライン１１を基準レベルとした電圧信号
が出力される。そうして、この電圧信号がオペアンプ八
１の反転入力端子に加わることによシ、すなわちフィー
ドバックがかかることによシミ流−電圧変換用抵抗Ｒ，
に現われる電圧降下ｖｆと電圧信号ＶＩＮの電圧値とが
等しくなる。これＫよシ差動増幅器Ａ２からも電圧降下
ｖｆと同一レベルの電圧信号が出力されてオペアンプ八
１の反転入力端子に加わる。このようにして電圧信号Ｖ
ＩＮに比例した電流信号工◎が負荷抵抗ＲＬに流れるこ
とになるＯ
ここで、オペアンプ八１、トランジスタＱやその他の部
分において故障（例えば断線）が発生するか、あるいは
出力電流検出回路１０において故障が発生すると、オペ
アン７’ＡＪに正常なフィードバックがかからなくな、
る。すると、差動増幅器Ａ２から出力される電圧信号が
変動し、電圧信号ＶＩＮとの間に大きな電圧差が生じる
。そこで、異常診断回路２０は、電圧信号ｖ４と差動増
幅器Ａ２から出力される電圧信号とを比較し、所定の電
圧差以上となった場合に電圧信号ｖ、Ｎに比例した電流
信号ｒｏが出力されていないと診断−して異常診断信号
２０ａを出力する。この異常診断信号２０ｍが出力され
ると、例えば調節針では制御信号や操作信号等の出力禁
止などの処理が行なわれる。Therefore, since the non-inverting input terminal of the differential amplifier A2 is connected to the input common line 11, a voltage signal with the input common line 11 as a reference level is output from the differential amplifier A. Then, by applying this voltage signal to the inverting input terminal of the operational amplifier 81, that is, by applying feedback, the current-voltage conversion resistor R,
The voltage drop vf appearing at and the voltage value of the voltage signal VIN become equal. A voltage signal having the same level as the voltage drop vf is also output from the differential amplifier A2 and applied to the inverting input terminal of the operational amplifier 81. In this way, the voltage signal V
A current signal ◎ proportional to IN will flow to the load resistor RL. Here, a failure (for example, disconnection) occurs in the operational amplifier 81, the transistor Q, or other parts, or a failure occurs in the output current detection circuit 10. When this occurs, normal feedback will not be applied to op 7'AJ, and
Ru. Then, the voltage signal output from the differential amplifier A2 fluctuates, and a large voltage difference occurs between it and the voltage signal VIN. Therefore, the abnormality diagnosis circuit 20 compares the voltage signal v4 with the voltage signal output from the differential amplifier A2, and when the voltage difference exceeds a predetermined value, a current signal ro proportional to the voltage signals v and N is output. If not, it is diagnosed and an abnormality diagnosis signal 20a is output. When this abnormality diagnosis signal 20m is output, processing such as prohibiting the output of control signals, operation signals, etc., is performed in the adjustment needle, for example.
このように本発明の装置においては、トランジスタＱの
エミッタ端子に出力電流検出回路１０を接続し、この出
力電流検出回路１０から出力される電圧信号をオペアン
７’ＡＪにフィードバックさせるとともに、この電圧信
号と電圧信号ＶＩＮとを異常診断回路２０によシ比較し
て異常出力を診断するように構成した。したがって、回
路構成は従来のものと比較して簡単となった。すななち
、出力電流回路１０がフィードバックループ内にあル、
この回路１０を別途設けずＫすむからである。これＫよ
シ、出力電流回路１０およびオペアンプＡ１、トランジ
スタＱのいずれか一方側が故障したとしても、その故障
はすぐに異常診断回路２０によシ確実に診断され、電圧
−電流変換表１としての信頼性が高くなる。In this way, in the device of the present invention, the output current detection circuit 10 is connected to the emitter terminal of the transistor Q, and the voltage signal output from the output current detection circuit 10 is fed back to the operational amplifier 7'AJ, and this voltage signal is and voltage signal VIN are compared by an abnormality diagnostic circuit 20 to diagnose abnormal output. Therefore, the circuit configuration is simpler than the conventional one. That is, if the output current circuit 10 is in the feedback loop,
This is because this circuit 10 does not have to be provided separately. Therefore, even if one side of the output current circuit 10, operational amplifier A1, or transistor Q fails, the failure will be immediately and reliably diagnosed by the abnormality diagnosis circuit 20, and the voltage-current conversion table 1 will be Increased reliability.
さらに、例えば本発明の装置を調節計に適用したとすれ
ば、異常診断信号２０ｍのを受けて電流信号工◎の出力
を禁止できるので、調節計から監視所等へは正確な信号
のみが伝送できる。Furthermore, if the device of the present invention is applied to a controller, for example, it is possible to inhibit the output of the current signal ◎ in response to an abnormality diagnosis signal of 20 m, so that only accurate signals are transmitted from the controller to a monitoring station, etc. can.
また、電流−電圧変換用抵抗Ｒｆは、フィードバックル
ープに接続されているので、負荷抵抗ＲＬに流れる電流
信号１．は、負荷抵抗ＲＬの大きさに影響されない。ゆ
えに大きな負荷抵抗ＲＬにも本発明装置は適用できる。Furthermore, since the current-voltage conversion resistor Rf is connected to the feedback loop, the current signal 1. is not affected by the magnitude of load resistance RL. Therefore, the device of the present invention can also be applied to a large load resistance RL.
なお、本発明は上記一実施例に限定されるものではない
。例えば第２図に示すように出力電流検出回路３０の抵
抗ＲＪ、Ｒ，”ｉ電流−電圧変換用抵抗Ｒｆよシも十分
に大きく設定し、これら抵抗Ｒ７，、Ｒｊ？に流れる電
流を無視できるように構成してもよい。、このように構
成しても上記一実施例と同様の効果を奏することができ
る。Note that the present invention is not limited to the above embodiment. For example, as shown in FIG. 2, the resistors RJ, R, "i" and the current-voltage conversion resistor Rf of the output current detection circuit 30 are also set sufficiently large so that the current flowing through these resistors R7, Rj? can be ignored. Even with this configuration, the same effects as in the above embodiment can be achieved.
本発明によれば、電圧−電流変換回路の出力電流信号を
出、力電流検出回路によシ検出して電圧信号に変換し、
この電圧信号を電圧−電流変換回路に°フィードバック
するとともに、この電圧信号と電圧−電流変換回路の入
力電圧信号とを比較して異常出力診断をするので、構盛
が簡単で確実に異常出力を診断でき、かつ大きな負荷抵
抗にも適用できる信頼性の高い電圧−電流変換装置を提
供できる。According to the present invention, the output current signal of the voltage-current conversion circuit is output, detected by the power current detection circuit, and converted into a voltage signal,
This voltage signal is fed back to the voltage-current conversion circuit, and the abnormal output is diagnosed by comparing this voltage signal with the input voltage signal of the voltage-current conversion circuit, so the configuration is simple and the abnormal output can be detected reliably. It is possible to provide a highly reliable voltage-current converter that can be diagnosed and applied even to large load resistances.
第１図は本発明に係る電圧−電流変換装置の一実施例を
示す構成図、第２図は本発明の変換装置の変形例を示す
構成図、第３図は従来の電圧−電流変換回路の回路構成
図、第４図は第３図に示す回路に異常診断機能を備えた
場合の構成図である。
Ａ１・・・演算増幅器、Ｑ・・・電流増幅用トランジス
タ、ＲＬ・・・負荷抵抗、１０・・・出力電流検出回路
、Ｒｆ・・・電流−電圧変換用抵抗、ＢＡＪ 、Ｂｉ２
・・・バッファアンプ、Ａ２・・・差動増幅器、２０・
・・異常診断回路。
出願人代理人 弁理士 鈴 江 武 彦第２図FIG. 1 is a block diagram showing an embodiment of the voltage-current converter according to the present invention, FIG. 2 is a block diagram showing a modification of the converter according to the present invention, and FIG. 3 is a conventional voltage-current converter circuit. FIG. 4 is a circuit diagram of the circuit shown in FIG. 3 provided with an abnormality diagnosis function. A1... operational amplifier, Q... transistor for current amplification, RL... load resistance, 10... output current detection circuit, Rf... resistance for current-voltage conversion, BAJ, Bi2
... Buffer amplifier, A2... Differential amplifier, 20.
...Abnormality diagnosis circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 2
Claims (1)
圧−電流変換回路と、この電圧−電流変換回路から出力
された電流信号を検出し、かつこの電流信号を電圧信号
に変換して前記電圧−電流変換回路にフィードバックす
る出力電流検出回路と、この出力電流検出回路から出力
される電圧信号と前記電圧−電流変換回路の入力電圧信
号とを受け、これら電圧信号と入力電圧信号との差が所
定値以上の場合に、前記電圧−電流変換回路が入力電圧
信号に比例した電流信号に変換していないと診断する異
常診断回路とを備えたことを特徴とする電圧−電流変換
装置。A voltage-to-current conversion circuit that converts an input voltage signal into a current signal and outputs the signal, and a voltage-to-current conversion circuit that detects the current signal output from the voltage-to-current conversion circuit and converts this current signal to a voltage signal to convert the voltage to the voltage signal. - an output current detection circuit that feeds back to the current conversion circuit, and receives the voltage signal output from the output current detection circuit and the input voltage signal of the voltage-current conversion circuit, and detects the difference between these voltage signals and the input voltage signal; 1. A voltage-to-current conversion device comprising: an abnormality diagnosis circuit for diagnosing that the voltage-to-current conversion circuit is not converting the input voltage signal into a current signal proportional to the input voltage signal when the input voltage signal is greater than or equal to a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13168984A JPS6111824A (en) | 1984-06-26 | 1984-06-26 | Voltage/current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13168984A JPS6111824A (en) | 1984-06-26 | 1984-06-26 | Voltage/current converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6111824A true JPS6111824A (en) | 1986-01-20 |
Family
ID=15063908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13168984A Pending JPS6111824A (en) | 1984-06-26 | 1984-06-26 | Voltage/current converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6111824A (en) |
-
1984
- 1984-06-26 JP JP13168984A patent/JPS6111824A/en active Pending
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