JPH09159711A - Disconnection detection equipment - Google Patents
Disconnection detection equipmentInfo
- Publication number
- JPH09159711A JPH09159711A JP7321897A JP32189795A JPH09159711A JP H09159711 A JPH09159711 A JP H09159711A JP 7321897 A JP7321897 A JP 7321897A JP 32189795 A JP32189795 A JP 32189795A JP H09159711 A JPH09159711 A JP H09159711A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting elements
- signal line
- signal
- pulse encoder
- 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.)
- Granted
Links
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
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 a signal line disconnection detecting device between a voltage output type pulse encoder used for detecting a position and a speed of a motor and an inverter device 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 A device of this type is a signal for outputting a signal from a pulse encoder to a control device such as an inverter when a voltage output type pulse encoder is attached to a motor shaft and feedback control of speed and position is performed. If the wire is broken, the control device may run out of control, and therefore it 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 thereof is shown in FIG. FIG. 4 is a waveform chart for explaining the operation. In FIG. 3, 1 is a voltage output type pulse encoder, 2 is an interface circuit 2
A control device 3 such as an inverter including 1 and the disconnection detection device 22 is a signal line. The interface circuit 21 includes an amplifier AMP for voltage adjustment, a photocoupler PH for signal isolation, and the like, and controls the 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 is an operational amplifier O.
P, rectifier RE, amplifier AMP and photocoupler PH
The shunt resistor R
The signal is detected by s, amplified by the operational amplifier OP, shaped by the waveform, and then rectified by the rectifier RE to detect disconnection. That is, in the normal state, the 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. The disconnection is detected by utilizing the fact that the current I becomes zero at the time of disconnection.
【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。It should be noted that a potential difference as shown in FIG. 4C occurs in the shunt resistor Rs due to the current flowing through the signal line 3 in a normal state. This is amplified by the operational amplifier OP, waveform-shaped, and then rectified by the rectifier RE. Then, an output as shown in FIG. 4D is obtained. The output of the rectifier RE is the amplifier AM
The signal is given to the photocoupler PH via P and is output as a detection signal FLT indicating normality or abnormality as shown in FIG. Note that FIG. 4A shows the 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。However, in the conventional device as described above, the value of the detection voltage is near the power supply voltage (when the current is at the high level I H ) or near 0 V (when the current is at the low level I L ). However, there is a possibility that this will fall out of the voltage input range in which the operational amplifier can operate, and it will become inoperable. For this reason, it is necessary to drive the operational amplifier with a voltage higher than the power supply voltage of the pulse encoder, or to operate the operational amplifier with a bipolar power supply to detect near 0 V.
Further, since the shunt resistance is for reducing the peak value of the detection signal of the pulse encoder, it is desirable that the resistance value is as small as possible. As a result, the input voltage of the operational amplifier tends to be very small, which causes a problem that noise resistance is deteriorated.
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 consisting of a light emitting element and a light receiving element are provided to connect each light emitting element in series, and the connection point of the two light emitting elements is connected to a signal line. To do. As a result, in a normal state, one of the two photocouplers always emits light depending on the direction of the current flowing in each light emitting element. On the other hand, when a disconnection occurs, no current flows in each light emitting element, and none of the light emitting elements emits light. Therefore, the disconnection can be detected by whether or not the light from the two light emitting elements is received. it can. Since the power supply of the pulse encoder and the light receiving element are electrically isolated, it can be isolated without additional circuits as in the conventional example, and can be configured with only passive elements, which simplifies the circuit configuration and reduces noise resistance. It is possible to make the device high.
【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。1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation thereof. 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 the connection point of the two light emitting elements is connected to the signal line 3. To be 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, R2 generate alternating currents I H and I L , which flow through the light emitting elements of the photocouplers PH1 and PH2. When the current I H is flowing,
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 I L is flowing,
As in (d), the light emitting element of PH2 emits light and the corresponding light receiving element is turned on. Therefore, when one of the currents I H and I L is flowing, one of PH1 and PH2 is on, and the signal S1 shown in FIG. 2 (e) is kept on (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 controller 2 is broken, the currents I H and I
Since L does not flow, the photocouplers PH1 and PH2 are shown in FIG.
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 high level as shown in FIG.
It will be detected as a disconnection. A whisker-like waveform is observed in the waveform of the signal S1 shown in FIG. 2E at the moment when the direction of the current changes. This is a pulse encoder 1
This is due to the mismatch of the instantaneous inclination when the voltage level changes and the inclination 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 so as to be removed (FIG. 2 (f)).
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 to connect the respective light emitting elements in series, and the connection point of the two light emitting elements is connected to the signal line. In addition to being able to perform insulation without any additional circuit, it is possible to obtain an advantage that the circuit configuration can be simplified and the noise resistance can be improved because it can be configured by only passive elements.
【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 diagram for explaining the operation of FIG.
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 SYMBOLS 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に接続し、前記発光素子に流
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 signal line,
Two photocouplers each including a light emitting element and a light receiving element are provided to connect the respective light emitting elements in series, and the connection point of the two light emitting elements is connected to the signal line, and the signal is detected from the presence / absence of current flowing through the light emitting element. A wire breakage detecting device characterized by detecting wire breakage.
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 true JPH09159711A (en) | 1997-06-20 |
| JP3289815B2 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017056411A1 (en) * | 2015-09-28 | 2017-04-06 | 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
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017056411A1 (en) * | 2015-09-28 | 2017-04-06 | パナソニックＩｐマネジメント株式会社 | Detection circuit and management device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3289815B2 (en) | 2002-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH05196677A (en) | Fault detecting device of driving circuit | |
| US4636929A (en) | Abnormal state detecting circuit of inverter | |
| JP3289815B2 (en) | Disconnection detection device | |
| JP5042749B2 (en) | Solid state relay | |
| JP3370855B2 (en) | Level detection circuit and combustion control device | |
| JP2006129276A (en) | Communication controller and air conditioner | |
| JPH09182463A (en) | Arm short circuit detector of voltage type inverter | |
| JPWO2018079299A1 (en) | Power converter | |
| US11777438B2 (en) | Motor drive device | |
| JP3080526B2 (en) | Current detection circuit | |
| JP2734208B2 (en) | Current source inverter | |
| JP3588707B2 (en) | Waveform shaping circuit | |
| JP3166141B2 (en) | Interface circuit | |
| JPH04347531A (en) | Abnormality detector for dc capacitor | |
| JPS5972997A (en) | Erroneous operation detector circuit for stepping motor | |
| JP3082508B2 (en) | Drive circuit abnormality detection circuit | |
| JPH01129794A (en) | Malfunction detector for chopper controlled dc motor device | |
| KR950007357Y1 (en) | The circuit to protect module damaged of transistors | |
| JP2000295763A (en) | Multiplex power supply | |
| JP2000165485A (en) | Polarity detecting circuit | |
| JPH0613232A (en) | Abnormality detecting device for load drive circuit | |
| JPH05244722A (en) | Protective circuit for dc power supply | |
| KR20000020085A (en) | Method for driving motor | |
| JPH0766629A (en) | Fail-safe detection circuit | |
| JPH06252730A (en) | Drive circuit for triac |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080322 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090322 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090322 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100322 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110322 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110322 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120322 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120322 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130322 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130322 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140322 Year of fee payment: 12 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |