JP3289815B2 - Disconnection detection device - Google Patents
Disconnection detection deviceInfo
- Publication number
- JP3289815B2 JP3289815B2 JP32189795A JP32189795A JP3289815B2 JP 3289815 B2 JP3289815 B2 JP 3289815B2 JP 32189795 A JP32189795 A JP 32189795A JP 32189795 A JP32189795 A JP 32189795A JP 3289815 B2 JP3289815 B2 JP 3289815B2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- signal line
- signal
- disconnection
- control device
- 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 - Lifetime
Links
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えばモータの
位置や速度検出などに用いられる電圧出力形パルスエン
コーダと、その制御装置としてのインバータ装置等との
間の信号線の断線検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a disconnection of a signal line between a voltage output type pulse encoder used for detecting, for example, the position and speed of a motor, and an inverter device or the like as a control device thereof.
【０００２】[0002]
【従来の技術】この種の装置は、モータ軸に電圧出力形
パルスエンコーダを取り付け、速度や位置のフィードバ
ック制御を行なう場合に、パルスエンコーダからの信号
をインバータ等の制御装置に出力するための信号線が断
線すると、制御装置が暴走することがあるので、これを
防止するために通常設けられる。2. Description of the Related Art In this type of apparatus, a voltage output type pulse encoder is attached to a motor shaft, and a signal for outputting a signal from the pulse encoder to a control device such as an inverter when performing feedback control of speed and position. If the wire breaks, the controller may run away, and is usually provided to prevent this.
【０００３】その１例を図３に示す。図４はその動作を
説明するための波形図である。図３において、１は電圧
出力形のパルスエンコーダ、２はインタフェース回路２
１および断線検出装置２２等からなるインバータ等の制
御装置、３は信号線である。インタフェース回路２１は
電圧調整のためのアンプＡＭＰや、信号絶縁のためのフ
ォトカプラＰＨなどからなり、パルスエンコーダ１と制
御装置２とのインタフェースを司っている。One example is shown in FIG. FIG. 4 is a waveform chart for explaining the operation. In FIG. 3, 1 is a pulse encoder of a voltage output type, and 2 is an interface circuit 2.
1 and a control device such as an inverter including a disconnection detection device 22 and the like, and 3 is a signal line. The interface circuit 21 includes an amplifier AMP for voltage adjustment, a photocoupler PH for signal insulation, and the like, and controls an interface between the pulse encoder 1 and the control device 2.
【０００４】また、断線検出装置２２はオペアンプＯ
Ｐ、整流器ＲＥ、アンプＡＭＰおよびフォトカプラＰＨ
などからなり、信号線３に流れる電流をシャント抵抗Ｒ
ｓで検出し、オペアンプＯＰにて増幅，波形成形したの
ち、整流器ＲＥにより整流して断線検出を行なうもので
ある。すなわち、信号線３には正常時は図４（ロ）に示
すような、パルスエンコーダ１の出力レベルに応じたハ
イレベル，ローレベルの電流Ｉ（ＩH ，ＩL ）が流れる
のに対し、断線時には電流Ｉが零となることを利用して
断線を検出するものである。The disconnection detecting device 22 includes an operational amplifier O
P, rectifier RE, amplifier AMP, and photocoupler PH
The current flowing through the signal line 3 is
The signal is detected by s, amplified and shaped by an operational amplifier OP, and then rectified by a rectifier RE to detect a disconnection. That is, high-level and low-level currents I (I H , I L ) corresponding to the output level of the pulse encoder 1 as shown in FIG. At the time of disconnection, the disconnection is detected by utilizing the fact that the current I becomes zero.
【０００５】なお、正常時に信号線３に流れる電流によ
り、シャント抵抗Ｒｓには図４（ハ）のような電位差が
生じるが、これはオペアンプＯＰにて増幅，波形成形さ
れたのち整流器ＲＥにより整流され、図４（ニ）に示す
ような出力が得られる。整流器ＲＥの出力はアンプＡＭ
Ｐを介してフォトカプラＰＨに与えられ、正常，異常を
示す検出信号ＦＬＴとして、図４（ホ）の如く出力され
ることになる。なお、図４（イ）は信号線３とコモン線
（ＣＭ）との間の電圧波形を示す。[0005] The current flowing through the signal line 3 in a normal state causes a potential difference in the shunt resistor Rs as shown in FIG. 4C. This potential difference is amplified and shaped by the operational amplifier OP, and then rectified by the rectifier RE. As a result, an output as shown in FIG. The output of the rectifier RE is the amplifier AM
It is given to the photocoupler PH via P, and is output as a detection signal FLT indicating normality or abnormality as shown in FIG. FIG. 4A shows a voltage waveform between the signal line 3 and the common line (CM).
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
ような従来装置では、検出電圧の値が電源電圧近傍（電
流がハイレベルＩH のとき）または０Ｖ近傍（電流がロ
ーレベルＩL のとき）のいずれかであるが、これがオペ
アンプの動作可能な電圧入力範囲から外れてしまい、動
作不能となるおそれがある。このため、パルスエンコー
ダの電源電圧よりも高い電圧でオペアンプを駆動した
り、両極性の電源でオペアンプを動作させて０Ｖ近傍の
検出ができるようにする、などの工夫が必要とされる。
また、シャント抵抗はパルスエンコーダの検出信号の波
高値を小さくするためのものであることから、その抵抗
値は極力小さいことが望ましい。その結果、オペアンプ
の入力電圧も微小なものとなる傾向があり、したがって
耐ノイズ性が悪化するという問題が生じることになる。
したがって、この発明の課題は、回路構成を簡単にし低
コスト化を図ることにある。[SUMMARY OF THE INVENTION However, in the conventional apparatus as described above, the value of the detection voltage (when the current high level I H) is the power supply voltage near or (when the current is at a low level I L) 0V vicinity However, this may deviate from the operable voltage input range of the operational amplifier, resulting in inoperability. For this reason, it is necessary to take measures such as driving the operational amplifier with a voltage higher than the power supply voltage of the pulse encoder, or operating the operational amplifier with a bipolar power supply so that detection near 0 V can be performed.
Since the shunt resistor is used to reduce the peak value of the detection signal of the pulse encoder, it is desirable that the resistance value be as small as possible. As a result, the input voltage of the operational amplifier also tends to be very small, which causes a problem that noise resistance deteriorates.
Therefore, an object of the present invention is to simplify the circuit configuration and reduce the cost.
【０００７】[0007]
【課題を解決するための手段】制御装置内に、発光素子
と受光素子からなる２つのフォトカプラを設けて各発光
素子を直列接続するとともに、その２つの発光素子の接
続点を信号線に接続する。これにより、正常時には２つ
のフォトカプラの各発光素子に流れる電流の方向に応じ
て、いずれか一方が必ず発光する。これに対し、断線が
生じた場合は各発光素子には電流が流れなくなって、い
ずれの発光素子も発光しないので、２つの発光素子の光
を受光するか否かで、断線を検出することができる。パ
ルスエンコーダの電源と受光素子とが電気的に絶縁され
ているため、従来例のような追加回路なしで絶縁ができ
るだけでなく、受動素子のみで構成できるため、回路構
成が簡素化され耐ノイズ性の高い装置とすることができ
る。In the control device, two photocouplers each comprising a light emitting element and a light receiving element are provided to connect each light emitting element in series, and a connection point between the two light emitting elements is connected to a signal line. I do. Thus, at normal time, one of the two photocouplers always emits light according to the direction of the current flowing through each light emitting element. On the other hand, if a disconnection occurs, no current flows to each light emitting element and none of the light emitting elements emits light. Therefore, it is possible to detect a disconnection by receiving light from two light emitting elements. it can. Since the power supply of the pulse encoder is electrically insulated from the light receiving element, not only can it be isolated without an additional circuit as in the conventional example, but it can also be configured with passive elements only, which simplifies the circuit configuration and reduces noise resistance. High device.
【０００８】[0008]
【発明の実施の形態】図１はこの発明の実施の形態を示
す回路図、図２はその動作を説明するための波形図であ
る。制御装置２内に、発光素子と受光素子からなる２つ
のフォトカプラＰＨ１，ＰＨ２を設けて各発光素子を直
列接続するとともに、その２つの発光素子の接続点を前
記信号線３に接続して構成される。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining its operation. In the control device 2, two photocouplers PH1 and PH2 each including a light emitting element and a light receiving element are provided to connect the respective light emitting elements in series, and a connection point of the two light emitting elements is connected to the signal line 3. Is done.
【０００９】すなわち、パルスエンコーダ１はモータ等
の回転に応じ、パルス信号を出力する。このパルス信号
は、電圧ＶＡとインタフェース回路２１の負荷抵抗Ｒ
１，Ｒ２によって交番電流ＩH ，ＩL となり、これがフ
ォトカプラＰＨ１，ＰＨ２の各発光素子を流れることに
なる。そして、電流ＩH が流れているときは、図２
（ハ）のようにＰＨ１の発光素子が発光して対応する受
光素子がオンし、電流ＩL が流れているときは、図２
（ニ）のようにＰＨ２の発光素子が発光して対応する受
光素子がオンする。したがって、電流ＩH ，ＩL のいず
れかが流れている場合は、ＰＨ１，ＰＨ２のどちらかが
オンしており、図２（ホ）に示す信号Ｓ１はオン状態
（ローレベル）を保つ。That is, the pulse encoder 1 outputs a pulse signal according to the rotation of a motor or the like. This pulse signal corresponds to the voltage VA and the load resistance R of the interface circuit 21.
1 and R2, the alternating currents I H and I L flow through the light emitting elements of the photocouplers PH1 and PH2. When the current I H is flowing, FIG.
As shown in (c), when the light emitting element of PH1 emits light and the corresponding light receiving element is turned on and the current IL is flowing, FIG.
As shown in (d), the light emitting element of PH2 emits light and the corresponding light receiving element is turned on. Thus, if the current I H, any of the I L is flowing, PH1, either PH2 is on and the signal S1 shown in FIG. 2 (e) maintains the ON state (low level).
【００１０】これに対し、パルスエンコーダ１と制御装
置２との間の信号線３が断線した場合は、電流ＩH ，Ｉ
L が流れないためフォトカプラＰＨ１，ＰＨ２は図２
（ハ），（ニ）に示すようにオフし、図２（ホ）に示す
信号Ｓ１がハイレベル（Ｐ５）となる。これにより、検
出信号ＦＬＴも図２（ヘ）のようにハイレベルとなり、
断線として検出されることになる。なお、図２（ホ）に
示す信号Ｓ１の波形に、電流の向きが変化する瞬間にヒ
ゲ状の波形が観測される。これは、パルスエンコーダ１
そのものの、電圧レベルが変化するときの瞬間的な傾き
と、フォトカプラＰＨ１，ＰＨ２のターンオン，ターン
オフの傾きの不一致によるもので誤検出の原因となる。
そこで、図１には抵抗ＲおよびコンデンサＣからなるフ
ィルタを設けて、除去するようにしている（図２（ヘ）
の信号ＦＬＴ参照）。On the other hand, when the signal line 3 between the pulse encoder 1 and the control device 2 is disconnected, the currents I H , I
Since L does not flow, the photocouplers PH1 and PH2
The signal is turned off as shown in (c) and (d), and the signal S1 shown in FIG. 2 (e) becomes high level (P5). As a result, the detection signal FLT also becomes a high level as shown in FIG.
This will be detected as a disconnection. In the waveform of the signal S1 shown in FIG. 2E, a mustache-like waveform is observed at the moment when the direction of the current changes. This is pulse encoder 1
This is due to a mismatch between the instantaneous gradient when the voltage level changes and the gradient of the turn-on and turn-off of the photocouplers PH1 and PH2, which causes erroneous detection.
Therefore, a filter including a resistor R and a capacitor C is provided in FIG. 1 to remove the filter (FIG. 2F).
Signal FLT).
【００１１】[0011]
【発明の効果】この発明によれば、２つのフォトカプラ
を設けて各発光素子を直列接続するとともに、その２つ
の発光素子の接続点を信号線に接続するようにしたの
で、従来例のような追加回路なしで絶縁ができるだけで
なく、受動素子のみで構成できることから回路構成が簡
素化され、耐ノイズ性を高めることができるという利点
が得られる。According to the present invention, two photocouplers are provided, each light emitting element is connected in series, and the connection point of the two light emitting elements is connected to the signal line. Insulation can be achieved without any additional circuit, and the configuration can be made up of only passive elements, so that the circuit configuration can be simplified and the noise resistance can be improved.
【図１】この発明による実施の形態を示す回路図であ
る。FIG. 1 is a circuit diagram showing an embodiment according to the present invention.
【図２】図１の動作を説明するための波形図である。FIG. 2 is a waveform chart for explaining the operation of FIG.
【図３】断線検出装置の従来例を示す回路図である。FIG. 3 is a circuit diagram showing a conventional example of a disconnection detection device.
【図４】図３の動作を説明するための波形図である。FIG. 4 is a waveform chart for explaining the operation of FIG. 3;
【符号の説明】 １…パルスエンコーダ、２…制御装置、２１…インタフ
ェース回路、２２…断線検出装置、３…信号線。[Description of Signs] 1 ... Pulse encoder, 2 ... Control device, 21 ... Interface circuit, 22 ... Disconnection detection device, 3 ... Signal line.
Claims (1)
スエンコーダと１本の信号線を介して接続される制御装
置に、発光素子と受光素子からなる２つのフォトカプラ
を設けて各発光素子を直列接続し、その２つの発光素子
の接続点を前記信号線に接続するとともに、２つの発光
素子の前記接続点とは別の側も共通にして、前記制御装
置内インタフェース回路の入力端子に１本の信号線を介
して接続し、前記各発光素子に流れる電流の有無から前
記信号線の断線を検出することを特徴とする断線検出装
置。1. A control device connected to a voltage output type pulse encoder installed on a controlled object via a single signal line is provided with two photocouplers each including a light emitting element and a light receiving element. the series connection, thereby connecting the connection point of the two light emitting elements to said signal lines, two light
The other side of the element from the connection point is also common, and the control device is
One signal line to the input terminal of the internal interface circuit
And detecting the disconnection of the signal line based on the presence or absence of a current flowing through each of the light emitting elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32189795A JP3289815B2 (en) | 1995-12-11 | 1995-12-11 | Disconnection detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32189795A JP3289815B2 (en) | 1995-12-11 | 1995-12-11 | Disconnection detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09159711A JPH09159711A (en) | 1997-06-20 |
| JP3289815B2 true JP3289815B2 (en) | 2002-06-10 |
Family
ID=18137629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32189795A Expired - Lifetime JP3289815B2 (en) | 1995-12-11 | 1995-12-11 | Disconnection detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3289815B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6712811B2 (en) * | 2015-09-28 | 2020-06-24 | パナソニックＩｐマネジメント株式会社 | Detection circuit and management device |
-
1995
- 1995-12-11 JP JP32189795A patent/JP3289815B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09159711A (en) | 1997-06-20 |
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