JPH10123183A - Momentary power failure detector - Google Patents
Momentary power failure detectorInfo
- Publication number
- JPH10123183A JPH10123183A JP27385496A JP27385496A JPH10123183A JP H10123183 A JPH10123183 A JP H10123183A JP 27385496 A JP27385496 A JP 27385496A JP 27385496 A JP27385496 A JP 27385496A JP H10123183 A JPH10123183 A JP H10123183A
- Authority
- JP
- Japan
- Prior art keywords
- increment
- power failure
- instantaneous power
- signal
- detection 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.)
- Granted
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Power Sources (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種の制御装置に
使われるサーボ機構を駆動するサーボドライバとその付
属機器の瞬時停電検出装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a servo driver for driving a servo mechanism used in various control devices, and an instantaneous power failure detection device for an accessory device thereof.
【０００２】[0002]
【従来の技術】各種の制御装置に使われるサーボ機構を
駆動するサーボドライバのフィードバック信号用のセン
サ（以下センサと称す）は、サーボドライバ本体とは離
れた場所に設置されていることが多い。従ってセンサの
電源はサーボドライバ本体の電源とは別回路で供給され
るのが通例である。また、サーボドライバ本体の電源は
大電流のサーボモータを駆動できるように大容量電源で
ある場合が多い。一方、センサは一般に小型である必要
があり、その電源の時定数も比較的小さなものが多く用
いられている。このような機器構成でサーボ機構が待機
状態にあり、電流消費量が小さな状態のときに交流電源
の瞬時停電が起こったとき、サーボ機構本体の電源電圧
は定常値を保っているが、センサの電源電圧が低下し、
たとえば位置制御を行っている場合は位置センサが誤動
作し、位置ずれを起こす等の問題を起こすことがある。2. Description of the Related Art In many cases, a sensor for a feedback signal of a servo driver (hereinafter, referred to as a sensor) for driving a servo mechanism used in various control devices is installed at a place away from a servo driver main body. Therefore, the power of the sensor is usually supplied by a separate circuit from the power of the servo driver. In many cases, the power supply of the servo driver body is a large-capacity power supply so that a large-current servomotor can be driven. On the other hand, the sensor generally needs to be small, and the time constant of its power supply is relatively small. In such a device configuration, when the servo mechanism is in the standby state and the current consumption is small, when the instantaneous power failure of the AC power supply occurs, the power supply voltage of the servo mechanism main body maintains a steady value, but the sensor The power supply voltage drops,
For example, when position control is performed, the position sensor may malfunction and cause a problem such as displacement.
【０００３】この問題を回避するため、図４に示す瞬時
停電検出回路１が使われている。図４において、符号１
１、１２、１６〜１８は抵抗、１３、１４は発光ダイオ
ード、１５はフォトトランジスタ、１９はキャパシタを
表す。この回路の動作は、Ｓ１に与えられた交流入力電
圧信号が極性に拘わらず抵抗１１を介して発光ダイオー
ド１３または１４に流れて、交流電圧のゼロクロスポイ
ントの前後を除く所定の期間中１３または１４を発光さ
せ、フォトトランジスタ１５を励振してコレクタ−エミ
ッタ間を低インピーダンスにし、ＬＯＷ（以下、Ｌと称
する）レベル信号を発生させる。前記ゼロクロスポイン
トの前後の所定期間では、フォトトランジスタ１５は高
インピーダンスとなり、プルアップ抵抗１６を介して＋
電圧が印加されてＨＩＧＨ（以下、Ｈと称する）レベル
信号を発生し、図５（ｃ）のＳ２信号を作り出す。図５
（ａ）のＳ６に示す２つのサンプリングタイミングの
間、Ｓ２信号がＨ信号を継続していることを検出するこ
とにより瞬時停電検出を行っていた。たとえば図５の場
合、ｔ１〜ｔ２間およびｔ３〜ｔ４間でＳ２がＨレベル
を継続していることにより瞬時停電を検出し、この検出
信号に基づいてセンサの出力信号取り込みを一時保留す
る等の措置がとられている。To avoid this problem, an instantaneous power failure detection circuit 1 shown in FIG. 4 is used. In FIG.
1, 12, 16 to 18 are resistors, 13 and 14 are light emitting diodes, 15 is a phototransistor, and 19 is a capacitor. The operation of this circuit is such that the AC input voltage signal applied to S1 flows through the resistor 11 to the light emitting diode 13 or 14 irrespective of the polarity, and during the predetermined period 13 or 14 except before and after the zero cross point of the AC voltage. To excite the phototransistor 15 to reduce the impedance between the collector and the emitter, thereby generating a LOW (hereinafter referred to as L) level signal. During a predetermined period before and after the zero crossing point, the phototransistor 15 has a high impedance,
When a voltage is applied, a HIGH (hereinafter, referred to as H) level signal is generated, and an S2 signal shown in FIG. 5C is generated. FIG.
During the two sampling timings shown in S6 of (a), the instantaneous power failure detection is performed by detecting that the S2 signal is continuing the H signal. For example, in the case of FIG. 5, an instantaneous power failure is detected because S2 continues to be at the H level between t1 and t2 and between t3 and t4, and the capture of the output signal of the sensor is temporarily suspended based on the detection signal. Action has been taken.
【０００４】[0004]
【発明が解決しようとする課題】ところが上述の方法で
は、たとえば図５の時刻ｔ５でサーボドライバの交流入
力電源をメインテナンス等のため人為的にＯＦＦしたと
きも、図５（ｃ）のＳ２信号は時刻ｔ５から、サーボド
ライバの電源電圧が低下する時刻ｔ６までの期間がＨレ
ベルとなり、瞬時停電と同様の検出動作をする不具合が
発生する問題があった。本発明はこのような背景の下に
なされたもので、瞬時停電が起こったとき、これを正確
に検出して上位コントローラまたはユーザに報知して対
策を施すことができ、人為的な電源ＯＦＦの場合は誤検
出をしない瞬時停電検出装置を提供することを目的とす
る。However, in the above-mentioned method, even when the AC input power supply of the servo driver is artificially turned off at time t5 in FIG. 5 for maintenance or the like, the S2 signal in FIG. The period from time t5 to time t6 when the power supply voltage of the servo driver decreases is at the H level, and there is a problem that a detection operation similar to the momentary power failure occurs. The present invention has been made under such a background, and when an instantaneous power failure occurs, it can be accurately detected and notified to a host controller or a user to take a countermeasure. It is an object of the present invention to provide an instantaneous power failure detection device that does not perform erroneous detection.
【０００５】[0005]
【課題を解決するための手段】センサを有するサーボド
ライバにおいて、交流入力電源電圧波形のゼロクロスポ
イントの前後の所定の期間はＨレベル信号を出力し、ゼ
ロクロスポイントの前後の期間以外の期間はＬレベル信
号を出力する瞬時停電検出回路を設け、間隔計数カウン
タにより前記出力のうちＬレベルの期間は所定のクロッ
ク周波数でカウントアップし、前記出力のうちＨレベル
の期間は前記カウント値を保持する動作を行う。前記交
流入力電源電圧波形のゼロクロスポイントをサンプリン
グタイミングとして前記間隔計数カウンタ出力の増分を
検知し、増分無しを検知したときに増分無しフラグを立
て、このフラグと前記間隔計数カウンタの増分の有無に
よる判別により瞬時停電検出を行うことを特徴とするサ
ーボドライバの瞬時停電検出装置を提供する。In a servo driver having a sensor, an H level signal is output during a predetermined period before and after a zero cross point of an AC input power supply voltage waveform, and an L level signal is output during a period other than a period before and after the zero cross point. An instantaneous power failure detection circuit for outputting a signal is provided. The interval counting counter counts up at a predetermined clock frequency during the L level of the output, and holds the count value during the H level of the output. Do. The zero-cross point of the AC input power supply voltage waveform is used as a sampling timing to detect an increase in the output of the interval counter, and when no increase is detected, sets a no-increment flag, and determines whether the flag and the interval counter have an increment. The present invention provides an instantaneous power failure detection device for a servo driver, wherein the instantaneous power failure detection is performed by the following.
【０００６】[0006]
【発明の実施の形態】図１は本発明の一実施形態による
瞬時停電検出装置の構成を示すブロック図である。図１
において、符号１は交流入力電源電圧波形のゼロクロス
ポイントの前後の所定の期間Ｈ信号を送出する瞬時停電
検出回路で、具体的構成は図４の従来例と共通となって
いる。符号２は前記瞬時停電検出回路の出力がＬ信号で
ある期間中は所定のクロック周波数でカウントアップを
続け、前記瞬時停電検出回路の出力がＨ信号である期間
中は前記カウント値を保持する間隔計数カウンタ、３は
前記間隔計数カウンタ出力の増分検知回路、４は前記増
分検知回路が増分無しを検知したときにフラグをたてる
増分無しフラグ記憶部、５は前記交流入力のゼロクロス
ポイントでタイミング信号を発生するサンプリングタイ
ミング回路、６は前記各信号により瞬時停電の判別を行
う判別部である。図２は図１による実施形態の各部の動
作波形の一例を示す図であり、図３は図１による実施形
態の動作フロー図である。FIG. 1 is a block diagram showing the configuration of an instantaneous power failure detection device according to one embodiment of the present invention. FIG.
In the figure, reference numeral 1 denotes an instantaneous power failure detection circuit for transmitting an H signal for a predetermined period before and after a zero cross point of an AC input power supply voltage waveform, and its specific configuration is common to the conventional example of FIG. Reference numeral 2 denotes an interval during which the count-up is continued at a predetermined clock frequency while the output of the instantaneous power failure detection circuit is an L signal, and the count value is held while the output of the instantaneous power failure detection circuit is an H signal. A counter 3, an increment detection circuit for the output of the interval counter, 4 a non-increment flag storage unit for setting a flag when the increment detection circuit detects no increment, 5 a timing signal at the zero cross point of the AC input. The sampling timing circuit 6 generates a momentary power failure based on the signals. FIG. 2 is a diagram showing an example of an operation waveform of each unit of the embodiment shown in FIG. 1, and FIG. 3 is an operation flowchart of the embodiment shown in FIG.
【０００７】図１の動作について図２を参照しながら説
明する。図２の時刻ｔ１において、（ｂ）に示す交流入
力信号Ｓ１が瞬時停電検出回路１に印加されると、
（ｃ）に示す信号Ｓ２が得られ、間隔計数カウンタ２に
おいてＳ２のＬレベル区間で所定のクロック周波数によ
るカウントアップを行い、Ｓ２のＨレベル区間ではカウ
ント値を保持する動作をし、図３（ｄ）に示すカウント
アップ信号Ｓ３を作り出す。このカウントアップ信号Ｓ
３は、サンプリングタイミング回路５が生成するタイミ
ング信号Ｓ６のタイミングによって、増分検知回路３に
おいて増分の有無が検知され、検知結果が信号Ｓ４とし
て出力される。時刻ｔ２において交流入力Ｓ１が「断」
になると、その間、瞬時停電検出出力Ｓ２はＨレベルを
継続し、時刻ｔ３とｔ４の間の間隔計数カウンタＳ３の
増分がないので、時刻ｔ４において、増分無しフラグ記
憶部５が図３（ｅ）のフラグＳ５をたてる。このフラグ
Ｓ５が立った後の増分検知回路３の増分有りの信号Ｓ４
と、前記フラグＳ５との論理積を時刻ｔ６のサンプリン
グタイミングで瞬時停電信号Ｓ７として図３（ｆ）に示
す如く出力する。この瞬時停電信号Ｓ７は上位コントロ
ーラのコンピュータポートまたはユーザに報知され、シ
ステムの誤動作回避が行われる。The operation of FIG. 1 will be described with reference to FIG. At time t1 in FIG. 2, when the AC input signal S1 shown in (b) is applied to the instantaneous power failure detection circuit 1,
A signal S2 shown in (c) is obtained, the interval counter 2 counts up at a predetermined clock frequency in the L level section of S2, and operates to hold the count value in the H level section of S2. A count-up signal S3 shown in d) is generated. This count-up signal S
In 3, the presence or absence of the increment is detected by the increment detection circuit 3 based on the timing of the timing signal S 6 generated by the sampling timing circuit 5, and the detection result is output as a signal S 4. At time t2, the AC input S1 is turned off.
During this time, the instantaneous power failure detection output S2 continues to be at the H level, and there is no increment of the interval counter S3 between the times t3 and t4. The flag S5 is set. The signal S4 indicating that the increment is detected by the increment detection circuit 3 after the flag S5 has been set.
The logical product of the flag and the flag S5 is output as the instantaneous power failure signal S7 at the sampling timing of the time t6 as shown in FIG. This momentary power failure signal S7 is reported to the computer port of the host controller or the user, and the malfunction of the system is avoided.
【０００８】また、システムのメインテナンスなどでサ
ーボドライバの電源を１台だけＯＦＦとした場合は、同
様に増分無しフラグＳ５が立つが、その後のサンプリン
グタイミングでの間隔計数カウンタＳ３の増分がないた
めＳ４がＨレベルとならず、従ってＳ７がＨレベルとな
らないので瞬時停電の誤検出をすることはない。因み
に、上述の動作をフローチャートで表すと図３のように
なり、各プロセスを順にたどると以下のようになる。 ｐ１ … 電源ＯＮのチェック ｐ２ … 間隔計数カウンタの増分無し検知フラグのリ
セット ｐ３ … 間隔計数カウンタの増分の有無チェック ｐ４ … 間隔計数カウンタが増分無しを検知したとき
フラグを立てる ｐ５ … フラグのチェック ｐ６ … フラグが立ち、カウンタ増分有りの場合、ア
ラーム出力 以上、本発明の一実施形態の動作を図面を参照して詳述
してきたが、本発明はこの実施形態に限られるものでは
なく、本発明の要旨を逸脱しない範囲の設計変更等があ
っても本発明に含まれる。When only one servo driver is turned off for system maintenance or the like, the no-increase flag S5 is similarly set. However, since there is no increment of the interval counter S3 at the subsequent sampling timing, S4 is not used. Does not go to the H level, and therefore S7 does not go to the H level, so there is no erroneous detection of an instantaneous power failure. Incidentally, if the above operation is represented by a flowchart, it is as shown in FIG. 3, and when each process is traced in order, it becomes as follows. p1 ... Power ON check p2 ... Reset the interval count counter no increase detection flag p3 ... Check whether the interval count counter has incremented p4 ... Set a flag when the interval count counter detects no increment p5 ... Check flag p6 ... The operation of the embodiment of the present invention has been described in detail with reference to the drawings. However, the present invention is not limited to this embodiment. Even a design change or the like within a range not departing from the gist is included in the present invention.
【０００９】[0009]
【発明の効果】これまでに説明したように、この発明に
よれば、サーボ機構を駆動するサーボドライバの交流入
力電源に瞬時停電が起きた場合と、メインテナンス等で
人為的に交流入力電源をＯＦＦした場合の区別を明確に
できるようにし、瞬時停電の場合にのみアラーム信号を
送出できるようにしたので、システムの誤動作を回避で
き、信頼性を向上できるという効果が得られる。As described above, according to the present invention, when an instantaneous power failure occurs in the AC input power supply of the servo driver that drives the servo mechanism, and when the AC input power supply is artificially turned off due to maintenance or the like. In such a case, the alarm signal can be sent out only in the case of an instantaneous power failure, so that a malfunction of the system can be avoided and the reliability can be improved.
【図１】 本発明の一実施形態による瞬時停電検出装置
の構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of an instantaneous power failure detection device according to an embodiment of the present invention.
【図２】 本発明の一実施形態による瞬時停電検出装置
の動作フロー図である。FIG. 2 is an operation flowchart of the instantaneous power failure detection device according to the embodiment of the present invention.
【図３】 本発明の一実施形態による瞬時停電検出装置
の各部の動作波形図である。FIG. 3 is an operation waveform diagram of each unit of the instantaneous power failure detection device according to the embodiment of the present invention.
【図４】 瞬時停電検出の内部回路を示す回路図であ
る。FIG. 4 is a circuit diagram showing an internal circuit for detecting a momentary power failure.
【図５】 従来の瞬時停電検出装置の各部の動作波形図
である。FIG. 5 is an operation waveform diagram of each unit of the conventional instantaneous power failure detection device.
１ 瞬時停電検出回路 ２ 間隔計数カウンタ ３ 増分検出回路 ４ 増分無しフラグ記憶部 ５ サンプリングタイミング回路 ６ 判別部 １１、１２、１６、１７、１８ 抵抗 １３、１４ 発光ダイオード １５ フォトトランジスタ １９ キャパシタ REFERENCE SIGNS LIST 1 instantaneous power failure detection circuit 2 interval counting counter 3 increment detection circuit 4 no-increase flag storage unit 5 sampling timing circuit 6 determination unit 11, 12, 16, 17, 18 resistor 13, 14 light-emitting diode 15 phototransistor 19 capacitor
Claims (2)
サーボドライバにおいて、 交流入力電源電圧波形のゼロクロスポイントの前後の所
定期間はＨＩＧＨレベル信号を出力し、前記交流入力電
源波形のゼロクロスポイントの前後の所定期間以外の期
間はＬＯＷレベル信号を出力する瞬時停電検出回路と、 前記出力のうちＬＯＷレベル信号の期間は所定のクロッ
ク周波数でカウントアップし、前記出力のうちＨＩＧＨ
レベル信号の期間は前記カウント値を保持する間隔計数
カウンタと、 前記交流入力電源電圧波形のゼロクロスポイントでサン
プリングタイミング信号を出力するサンプリングタイミ
ング回路と、 前記サンプリングタイミングで前記間隔計数カウンタ出
力の増分を検知する増分検知回路と、 前記増分検知回路が増分無しを検知したときに増分無し
フラグを立て記憶する記憶部と、 前記フラグの有無と増分検知の有無とにより瞬時停電の
有無を判別する判別部とを具備してなるサーボドライバ
の瞬時停電検出装置。1. A servo driver having a sensor for a feedback signal, wherein a HIGH level signal is output for a predetermined period before and after a zero cross point of an AC input power supply voltage waveform, and a predetermined period before and after the zero cross point of the AC input power supply waveform. An instantaneous power failure detection circuit that outputs a LOW level signal during periods other than the above, and counts up at a predetermined clock frequency during a period of the LOW level signal among the outputs, and outputs a HIGH level among the outputs.
An interval counter for holding the count value during a level signal period; a sampling timing circuit for outputting a sampling timing signal at a zero crossing point of the AC input power supply voltage waveform; and detecting an increment of the output of the interval counter at the sampling timing. An increment detection circuit, a storage unit that sets and stores an no-increase flag when the increment detection circuit detects no increment, and a determination unit that determines the presence or absence of an instantaneous power failure based on the presence or absence of the flag and the presence or absence of the increment detection. An instantaneous power failure detection device for a servo driver, comprising:
ち、かつ前記増分検知回路により増分有りが検知された
ことを条件として瞬時停電と判別し、瞬時停電信号を出
力することを特徴とする請求項１記載のサーボドライバ
の瞬時停電検出装置。2. The method according to claim 1, wherein the determination unit determines that an instantaneous power failure has occurred and outputs an instantaneous power failure signal on a condition that the no-increment flag is set and the presence of an increment is detected by the increment detection circuit. The instantaneous power failure detection device for a servo driver according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27385496A JP3765134B2 (en) | 1996-10-16 | 1996-10-16 | Instantaneous power failure detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27385496A JP3765134B2 (en) | 1996-10-16 | 1996-10-16 | Instantaneous power failure detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10123183A true JPH10123183A (en) | 1998-05-15 |
| JP3765134B2 JP3765134B2 (en) | 2006-04-12 |
Family
ID=17533487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27385496A Expired - Fee Related JP3765134B2 (en) | 1996-10-16 | 1996-10-16 | Instantaneous power failure detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3765134B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010139244A (en) * | 2008-12-09 | 2010-06-24 | Nissan Motor Co Ltd | Device and method for detecting abnormality of sensor |
| JP2020046955A (en) * | 2018-09-19 | 2020-03-26 | 株式会社東芝 | AC input device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785168B (en) * | 2016-03-03 | 2019-03-01 | 深圳市共进电子股份有限公司 | Detection circuit and automatic detection device |
-
1996
- 1996-10-16 JP JP27385496A patent/JP3765134B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010139244A (en) * | 2008-12-09 | 2010-06-24 | Nissan Motor Co Ltd | Device and method for detecting abnormality of sensor |
| JP2020046955A (en) * | 2018-09-19 | 2020-03-26 | 株式会社東芝 | AC input device |
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