JPH11118525A - Power source circuit for encoder - Google Patents
Power source circuit for encoderInfo
- Publication number
- JPH11118525A JPH11118525A JP9284842A JP28484297A JPH11118525A JP H11118525 A JPH11118525 A JP H11118525A JP 9284842 A JP9284842 A JP 9284842A JP 28484297 A JP28484297 A JP 28484297A JP H11118525 A JPH11118525 A JP H11118525A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- circuit
- power source
- light receiving
- receiving element
- 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
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Optical Transform (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンコーダの電源
回路に関し、特に、受光素子に定電圧回路を介して常時
定電圧を供給することにより、主電源再投入時における
受光素子の誤動作による多回転データの誤りの発生を防
止するための新規な改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit of an encoder, and more particularly to a power supply circuit for an encoder. The present invention relates to a novel improvement for preventing occurrence of a data error.
【０００２】[0002]
【従来の技術】従来、用いられていたこの種のエンコー
ダの電源回路としては、例えば、図３及び図４で示す構
成がある。すなわち、図３において符号１で示されるも
のは主電源であり、この主電源１には、スイッチ３を介
して第１ダイオード４、１回転データ検出回路９及び通
信回路１１が接続され、前記主電源１とは別に独立した
外部又は内蔵等のバッテリ２は第２ダイオード５を介し
て前記第１ダイオード４に接続されている。前記各ダイ
オード４及び５の接続点５Ａには、システムダウン検出
回路８、ＬＥＤからなる発光素子６、受光素子７及び多
回転データ検出回路１０が接続され、前記システムダウ
ン検出回路８及び多回転データ検出回路１０は通信回路
１１に接続され、受光素子７の第１、第２出力信号７
ａ，７ｂは１回転データ検出回路９及び多回転データ検
出回路１０へ各々入力されている。2. Description of the Related Art As a power supply circuit of an encoder of this type which has been conventionally used, for example, there is a configuration shown in FIGS. That is, in FIG. 3, reference numeral 1 denotes a main power supply, to which a first diode 4, a rotation data detection circuit 9 and a communication circuit 11 are connected via a switch 3; An external or internal battery 2 independent of the power supply 1 is connected to the first diode 4 via a second diode 5. A connection point 5A of each of the diodes 4 and 5 is connected to a system down detection circuit 8, a light emitting element 6 composed of an LED, a light receiving element 7, and a multi-rotation data detection circuit 10, and the system down detection circuit 8 and the multi-rotation data The detection circuit 10 is connected to the communication circuit 11, and outputs the first and second output signals 7 of the light receiving element 7.
“a” and “7b” are input to the one-rotation data detection circuit 9 and the multi-rotation data detection circuit 10, respectively.
【０００３】次に動作について述べる。図３の状態にお
いて、スイッチ３をオンとすると主電源１が入り、受光
素子７から出力される第１、第２出力７ａ，７ｂが各検
出回路９，１０に入力されて通信回路１１を経てエンコ
ーダ出力１１ａとして出力されている。前述の状態で主
電源１が停電等によって切れた場合、バッテリ２により
発光素子６、受光素子７及び多回転データ検出回路１０
がバックアップされる。この場合、バッテリ２の電圧
（３．６Ｖ）が多回転データ検出回路１０の検出不能と
なる電圧まで低下すると、システムダウン検出回路８が
作動して通信回路１１からのエンコーダ出力１１ａを停
止させ、その後、再び主電源１がオンとなった時にシス
テムダウン信号８ａが通信回路１１から出力される。な
お、実際には、システムダウン検出回路８を検出作動す
る電圧レベルは、多回転データ検出回路１０による多回
転データの検出不能となる電圧よりも高く設定されてい
る。Next, the operation will be described. In the state of FIG. 3, when the switch 3 is turned on, the main power supply 1 is turned on, and the first and second outputs 7a and 7b output from the light receiving element 7 are input to the respective detection circuits 9 and 10 and passed through the communication circuit 11. It is output as an encoder output 11a. When the main power supply 1 is cut off due to a power failure or the like in the above-described state, the light emitting element 6, the light receiving element 7, and the multi-rotation data detection circuit 10
Is backed up. In this case, when the voltage (3.6 V) of the battery 2 drops to a voltage at which the multi-rotation data detection circuit 10 cannot detect, the system down detection circuit 8 operates to stop the encoder output 11a from the communication circuit 11, Thereafter, when the main power supply 1 is turned on again, the system down signal 8a is output from the communication circuit 11. In practice, the voltage level at which the system down detection circuit 8 is detected and operated is set higher than the voltage at which the multi-rotation data detection circuit 10 cannot detect the multi-rotation data.
【０００４】[0004]
【発明が解決しようとする課題】従来のエンコーダの電
源回路は、以上のように構成されていたため、次のよう
な課題が存在していた。すなわち、図４に示されるよう
に、主電源１がオフとなり受光素子７に供給される電圧
がバッテリ２の電圧に低下している状態下で、主電源１
が再びオンとなると、受光素子７への電圧が瞬時に５Ｖ
まで高くなり、この過渡期に受光素子７から誤った出力
７ａ，７ｂが発生して誤検出データが出力されることが
あった。そのため、この誤検出を避けるには、オフ後の
主電源１が再びオンとなるまでの立ち上がり時間を制限
するか、又は、その立ち上がり速度を図４で示す急峻な
状態からゆるやかなものに変更する必要があった。The power supply circuit of the conventional encoder has the following problems because it is configured as described above. That is, as shown in FIG. 4, when the main power supply 1 is turned off and the voltage supplied to the light receiving element 7 is reduced to the voltage of the battery 2, the main power supply 1
Is turned on again, the voltage to the light receiving element 7 is instantaneously 5 V
In this transition period, erroneous outputs 7a and 7b may be generated from the light receiving element 7 and erroneous detection data may be output. Therefore, in order to avoid this erroneous detection, the rise time until the main power supply 1 is turned on after turning off is limited, or the rising speed is changed from a steep state shown in FIG. 4 to a gentle state. Needed.
【０００５】本発明は、以上のような課題を解決するた
めになされたもので、特に、受光素子に定電圧回路を介
して常時定電圧を供給することにより、主電源再投入時
における受光素子の誤動作による多回転データの誤りの
発生を防止するようにしたエンコーダの電源回路を提供
することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. In particular, a constant voltage is always supplied to the light receiving element via a constant voltage circuit, so that the light receiving element can be used when the main power is turned on again. It is an object of the present invention to provide a power supply circuit for an encoder which prevents the occurrence of an error in multi-rotation data due to a malfunction of the encoder.
【０００６】[0006]
【課題を解決するための手段】本発明によるエンコーダ
の電源回路は、主電源及びこの主電源とは別のバッテリ
を用い、前記バッテリで発光素子、受光素子及び多回転
データ検出回路をバックアップして多回転データを得る
と共に、前記バッテリの電圧が前記多回転データが検出
不能となる電圧まで低下するとシステムダウン検出回路
が作動し、前記主電源再投入時に前記システムダウン検
出回路からシステムダウン信号が通信回路を経て出力さ
れるようにしたエンコーダの電源回路において、前記受
光素子と前記主電源及びバッテリ間には定電圧電源を設
け、前記受光素子へは常時前記定電圧電源から定電圧を
供給する構成である。A power supply circuit of an encoder according to the present invention uses a main power supply and a battery separate from the main power supply, and the light-emitting element, the light-receiving element and the multi-turn data detection circuit are backed up by the battery. When the multi-rotation data is obtained and the voltage of the battery drops to a voltage at which the multi-rotation data cannot be detected, a system down detection circuit is activated, and a system down signal is transmitted from the system down detection circuit when the main power is turned on again. In a power supply circuit of an encoder configured to be output through a circuit, a constant voltage power supply is provided between the light receiving element, the main power supply, and a battery, and a constant voltage is constantly supplied to the light receiving element from the constant voltage power supply. It is.
【０００７】[0007]
【発明の実施の形態】以下、図面と共に本発明によるエ
ンコーダの電源回路の好適な実施の形態について説明す
る。なお、従来例と同一又は同等部分には同一符号を付
して説明する。図１及び図２において符号１で示される
ものは主電源であり、この主電源１にはスイッチ３を介
して第１ダイオード４、１回転データ検出回路９及び通
信回路１１が接続され、前記主電源１とは別に独立した
外部又は内蔵等のバッテリ２は第２ダイオード５を介し
て前記第１ダイオード４に接続されている。前記各ダイ
オード４及び５の接続点５Ａには、システムダウン検出
回路８、ＬＥＤからなる発光素子６、定電圧電源１２を
介して接続された受光素子７及び多回転データ検出回路
１０が接続され、前記システムダウン検出回路８及び多
回転データ検出回路１０は通信回路１１に接続され、受
光素子７の第１、第２出力信号７ａ，７ｂは１回転デー
タ検出回路９及び多回転データ検出回路１０へ各々入力
されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a power supply circuit of an encoder according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1 and FIG. 2, reference numeral 1 denotes a main power supply. The main power supply 1 is connected to a first diode 4, a rotation data detection circuit 9 and a communication circuit 11 via a switch 3, and An external or internal battery 2 independent of the power supply 1 is connected to the first diode 4 via a second diode 5. A connection point 5A between the diodes 4 and 5 is connected to a system down detection circuit 8, a light emitting element 6 composed of an LED, a light receiving element 7 connected via a constant voltage power supply 12, and a multi-rotation data detection circuit 10, The system down detection circuit 8 and the multi-rotation data detection circuit 10 are connected to a communication circuit 11, and the first and second output signals 7a and 7b of the light receiving element 7 are sent to the one-rotation data detection circuit 9 and the multi-rotation data detection circuit 10. Each has been entered.
【０００８】次に、動作について述べる。図１の状態に
おいて、スイッチ３をオンとすると、主電源１が入り、
定電圧電源１２で定電圧化された２．５Ｖの定電圧１２
ａが受光素子７に供給され、この受光素子７から出力さ
れる第１、第２出力７ａ，７ｂが各検出回路９，１０に
入力された通信回路１１を経てエンコーダ出力１１ａと
して出力されている。前述の状態で主電源１が停電等に
よって切れた場合、バッテリ２により定電圧電源１２、
受光素子７、発光素子６及び多回転データ検出回路１０
がバックアップされる。この場合、定電圧電源１２の定
電圧１２ａは、システムダウン検出回路８によってシス
テムダウンが検出される電圧とほぼ同じ電圧に設定され
ているため、バッテリ２の電圧２ａが低下し、定電圧電
源１２の定電圧１２ａが当初の電圧よりも下がり、主電
源１のオフ後に主電源１を再投入したとすると受光素子
７への定電圧１２ａが急峻に変化して従来のような誤動
作が起こる可能性があるが、このようにバッテリ２の電
圧２ａが低下した場合にはこの電圧２ａの低下を検出し
てシステムダウン検出回路８がシステムダウンを検出
し、主電源１の再投入時に通信回路１１からのエンコー
ダ出力１１ａとして出力されるため誤動作の可能性を知
ることができる。従って、前述のようなバッテリ２の電
圧２ａの低下が発生しないうちに主電源１が再びオンと
なって投入されていれば、図２で示すように、受光素子
７へは常に前記定電圧１２ａが供給され、受光素子７の
出力７ａ，７ｂは従来のような誤動作を起こすこともな
く、誤ったデータを出力することはない。Next, the operation will be described. When the switch 3 is turned on in the state of FIG. 1, the main power supply 1 is turned on,
2.5V constant voltage 12 which is constant voltage by constant voltage power supply 12
a is supplied to the light receiving element 7, and first and second outputs 7a and 7b output from the light receiving element 7 are output as encoder outputs 11a via the communication circuits 11 input to the respective detection circuits 9 and 10. . When the main power supply 1 is cut off due to a power failure or the like in the above-described state, the constant voltage power supply 12 is
Light receiving element 7, light emitting element 6, and multi-rotation data detection circuit 10
Is backed up. In this case, since the constant voltage 12a of the constant voltage power supply 12 is set to substantially the same voltage as the voltage at which the system down is detected by the system down detection circuit 8, the voltage 2a of the battery 2 decreases and the constant voltage power supply 12 If the constant voltage 12a falls below the initial voltage, and the main power supply 1 is turned on again after the main power supply 1 is turned off, the constant voltage 12a to the light receiving element 7 changes sharply, which may cause a malfunction as in the related art. However, when the voltage 2a of the battery 2 decreases, the system down detection circuit 8 detects the decrease of the voltage 2a and detects the system down. Is output as the encoder output 11a, it is possible to know the possibility of malfunction. Therefore, if the main power supply 1 is turned on again and turned on before the voltage 2a of the battery 2 does not drop as described above, the constant voltage 12a is always applied to the light receiving element 7 as shown in FIG. Is supplied, and the outputs 7a and 7b of the light receiving element 7 do not cause malfunction as in the related art, and do not output erroneous data.
【０００９】[0009]
【発明の効果】本発明によるエンコーダの電源回路は、
以上のように構成されているため、次のような効果を得
ることができる。すなわち、主電源及びバッテリに接続
された定電圧電源からの定電圧を常に受光素子へ供給し
て駆動しているため、主電源オフ後のバッテリによるバ
ックアップ時に主電源に切替える場合、従来のような主
電源の立ち上がり時間の制限をする必要もなく、誤動作
のない安定したエンコーダを得ることができる。The power supply circuit of the encoder according to the present invention
With the above configuration, the following effects can be obtained. That is, since the constant voltage from the constant voltage power supply connected to the main power supply and the battery is always supplied to the light receiving element for driving, when switching to the main power supply at the time of backup by the battery after the main power supply is turned off, the conventional power supply is used. There is no need to limit the rise time of the main power supply, and a stable encoder without malfunction can be obtained.
【図１】本発明によるエンコーダの電源回路を示す回路
図である。FIG. 1 is a circuit diagram showing a power supply circuit of an encoder according to the present invention.
【図２】図１の各部の波形図である。FIG. 2 is a waveform chart of each part of FIG.
【図３】従来の回路図である。FIG. 3 is a conventional circuit diagram.
【図４】図３の各部の波形図である。FIG. 4 is a waveform chart of each part in FIG. 3;
１ 主電源 ２ バッテリ ６ 発光素子 ７ 受光素子 ８ システムダウン検出回路 ８ａ システムダウン信号 １０ 多回転データ検出回路 １１ 通信回路 １２ 定電圧電源 １２ａ 定電圧 DESCRIPTION OF SYMBOLS 1 Main power supply 2 Battery 6 Light emitting element 7 Light receiving element 8 System down detection circuit 8a System down signal 10 Multi-turn data detection circuit 11 Communication circuit 12 Constant voltage power supply 12a Constant voltage
Claims (1)
ッテリ(2)を用い、前記バッテリ(2)で発光素子(6)、受
光素子(7)及び多回転データ検出回路(10)をバックアッ
プして多回転データを得ると共に、前記バッテリ(2)の
電圧が前記多回転データが検出不能となる電圧まで低下
するとシステムダウン検出回路(8)が作動し、前記主電
源(1)再投入時に前記システムダウン検出回路(8)からシ
ステムダウン信号(8a)が通信回路(11)を経て出力される
ようにしたエンコーダの電源回路において、前記受光素
子(7)と前記主電源(1)及びバッテリ(2)間には定電圧電
源(12)を設け、前記受光素子(7)へは常時前記定電圧電
源(12)から定電圧(12a)を供給することを特徴とするエ
ンコーダの電源回路。1. A main power supply (1) and a battery (2) different from the main power supply (1), and a light emitting element (6), a light receiving element (7) and multi-rotation data detection are performed by the battery (2). The circuit (10) is backed up to obtain multi-turn data, and when the voltage of the battery (2) drops to a voltage at which the multi-turn data cannot be detected, a system down detection circuit (8) is activated and the main power supply is turned off. (1) In a power supply circuit of an encoder in which a system down signal (8a) is output from the system down detection circuit (8) via a communication circuit (11) when re-input, the light receiving element (7) and the main A constant voltage power supply (12) is provided between the power supply (1) and the battery (2), and the light receiving element (7) is constantly supplied with a constant voltage (12a) from the constant voltage power supply (12). Power supply circuit for the encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9284842A JPH11118525A (en) | 1997-10-17 | 1997-10-17 | Power source circuit for encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9284842A JPH11118525A (en) | 1997-10-17 | 1997-10-17 | Power source circuit for encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11118525A true JPH11118525A (en) | 1999-04-30 |
Family
ID=17683738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9284842A Pending JPH11118525A (en) | 1997-10-17 | 1997-10-17 | Power source circuit for encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11118525A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098507A (en) * | 2000-06-30 | 2002-04-05 | Snr Roulements | Device for determining absolute angle position of rotational member |
| JP2013198257A (en) * | 2012-03-19 | 2013-09-30 | Denso Wave Inc | Control device for production apparatus |
-
1997
- 1997-10-17 JP JP9284842A patent/JPH11118525A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098507A (en) * | 2000-06-30 | 2002-04-05 | Snr Roulements | Device for determining absolute angle position of rotational member |
| JP2013198257A (en) * | 2012-03-19 | 2013-09-30 | Denso Wave Inc | Control device for production apparatus |
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