JP2504769B2 - Electromagnetic coil current value processing device - Google Patents
Electromagnetic coil current value processing deviceInfo
- Publication number
- JP2504769B2 JP2504769B2 JP9952587A JP9952587A JP2504769B2 JP 2504769 B2 JP2504769 B2 JP 2504769B2 JP 9952587 A JP9952587 A JP 9952587A JP 9952587 A JP9952587 A JP 9952587A JP 2504769 B2 JP2504769 B2 JP 2504769B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic coil
- current value
- signal
- processing device
- detecting means
- 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
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電磁コイルの電流値処理装置に係り、特に矩
形波で駆動される電磁コイルの電流値処理装置に関す
る。The present invention relates to a current value processing device for an electromagnetic coil, and more particularly to a current value processing device for an electromagnetic coil driven by a rectangular wave.
従来、矩形波でオン，オフ駆動される電磁コイルに流
れる電流値を検出する場合、電流値を検出する素子の出
力信号をローパスフィルターを通して平滑化していた。Conventionally, in the case of detecting a current value flowing in an electromagnetic coil that is driven on and off with a rectangular wave, an output signal of an element that detects the current value is smoothed through a low pass filter.
上述した従来の電流値処理装置では一般的に抵抗
（Ｂ）とコンデンサ（Ｃ）とによりローパスフィルター
を構成している。しかし該ローパスフィルターでは完全
な平滑化はできず、電磁コイルの駆動信号と同期したリ
プル信号が残る。仮りに駆動信号を一定にしても、検出
された信号は変動しているので、この検出された信号を
制御量として他の制御を行なう装置は誤った制御を行な
うことになる。そこで、上記問題を解決するためにロー
パスフィルターの時定数を大きくしてルプル信号を許容
範囲内まで小さくすれば良いが、時定数を大きくすると
電流値検出の応答遅れをまねくとかローパスフィルター
による減衰を補うための付加回路が必要になる。またロ
ーパスフィルターを通して得られる検出電流値は電磁コ
イルを駆動する信号のヂューティーの２乗に比例したも
のとなっているので、実際の電流値信号へ変換する補正
回路が必要になる等の欠点が生じる。In the conventional current value processing device described above, a low pass filter is generally formed by the resistor (B) and the capacitor (C). However, the low-pass filter cannot complete smoothing, and a ripple signal synchronized with the drive signal of the electromagnetic coil remains. Even if the drive signal is fixed, the detected signal fluctuates. Therefore, a device that performs other control using the detected signal as a control amount performs erroneous control. Therefore, in order to solve the above problem, the time constant of the low-pass filter should be increased to reduce the ripple signal to within the allowable range. An additional circuit is needed to make up for it. Further, since the detected current value obtained through the low-pass filter is proportional to the square of the duty of the signal for driving the electromagnetic coil, there are disadvantages such as the need for a correction circuit for converting it into an actual current value signal. .
本発明は以上の欠点を解決し電磁コイルに流れる電流
を誤って計測することなく処理する装置を提供するもの
である。The present invention solves the above drawbacks and provides an apparatus for processing a current flowing through an electromagnetic coil without erroneously measuring the current.
本発明の電流値処理装置は予め定めれられた操作量に
応じたパルス信号を発生するパルス信号発生手段と、そ
のパルス信号発生手段に基づいて電磁コイルを駆動する
駆動手段と駆動手段が駆動する電磁コイルに流れる電流
値を検出する電流検出手段と前記パルス信号発生手段の
立ち上がりエッジ，立ち下がりエッジの少なくとも一方
で前記電流検出手段の出力信号をサンプルアンドホール
ドする手段とを備えている。In the current value processing device of the present invention, pulse signal generating means for generating a pulse signal according to a predetermined operation amount, and driving means and driving means for driving an electromagnetic coil based on the pulse signal generating means are driven. A current detecting means for detecting a value of a current flowing through the electromagnetic coil and a means for sampling and holding the output signal of the current detecting means on at least one of a rising edge and a falling edge of the pulse signal generating means are provided.
次に本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の機能ブロック図である。
第１図において、予め定められた動作量u0をもとに、パ
ルス信号発生器１は所定の矩形波を発生する。駆動手段
２はパルス信号発生器１の出力信号に従がい電磁コイル
３を駆動する。電流値検出手段４は電磁コイル３に流れ
る電流値を検出する。サンプルアンドホールド回路６は
パルス信号発生器１の出力信号のエッジを検出するエッ
ジ検出手段７の出力信号に従がい前述の電流検出手段４
からの出力信号を処理して電磁コイル３に流れる電流値
を検出する。FIG. 1 is a functional block diagram of an embodiment of the present invention.
In FIG. 1, the pulse signal generator 1 generates a predetermined rectangular wave on the basis of a predetermined operation amount u 0 . The driving means 2 drives the electromagnetic coil 3 according to the output signal of the pulse signal generator 1. The current value detecting means 4 detects the value of the current flowing through the electromagnetic coil 3. The sample-and-hold circuit 6 follows the output signal of the edge detection means 7 for detecting the edge of the output signal of the pulse signal generator 1 and the above-mentioned current detection means 4
Is processed to detect the current value flowing in the electromagnetic coil 3.
第２図において、パルス発生器１は所定の操作量u0に
応じ第３図（ａ）に示すような矩形波を出力する。この
出力信号は抵抗20と駆動するトランジスタ８とで構成さ
れる駆動手段２へ供給される。駆動トランジスタ８のコ
レクタには他方が所望の電源VBに接続された電磁コイル
３がエミッタには抵抗９および増幅器10が接続されてい
る。駆動トランジスタ８は第３図（ａ）に示す“L"の時
にオフして抵抗９をアースへ接続したままとする“H"の
時にはオンして電磁コイル３を抵抗９に介して電源VBと
導通させる。抵抗９および増幅器10で電流値検出手段４
が構成されている。この抵抗９は駆動トランジスタ８が
オンしている時の電磁コイル３に流れる電流値を電圧へ
変換するもので、電流値に比例した電圧が得られる。そ
して増幅器10の非反転端子に供給されインピーダンス変
換される。前記第３図（ａ）で電磁コイル３を駆動した
時に電流値検出手段４で得られる波形は第３図（ｂ）の
ようになる。従来の技術ではこの信号をローパスフィル
ターに入力し第３図（ｃ）に示すような変動した電圧信
号を得る。そしてこの信号を一定とみなし電磁コイル３
に流れる電流を電圧に変換した検出電圧値V0としてい
る。In FIG. 2, the pulse generator 1 outputs a rectangular wave as shown in FIG. 3 (a) according to a predetermined operation amount u 0 . This output signal is supplied to the driving means 2 which is composed of the resistor 20 and the transistor 8 for driving. The electromagnetic coil 3 whose other end is connected to a desired power source V B is connected to the collector of the drive transistor 8, and the resistor 9 and the amplifier 10 are connected to the emitter. The driving transistor 8 is turned off at the time of "L" shown in FIG. 3 (a) and the resistor 9 is kept connected to the ground, and turned on at the time of "H" so that the electromagnetic coil 3 is connected to the power source V B via the resistor 9. And conduct. Current value detecting means 4 with resistor 9 and amplifier 10
Is configured. The resistor 9 converts a current value flowing through the electromagnetic coil 3 when the drive transistor 8 is on into a voltage, and a voltage proportional to the current value can be obtained. Then, the impedance is converted by being supplied to the non-inverting terminal of the amplifier 10. The waveform obtained by the current value detecting means 4 when the electromagnetic coil 3 is driven in FIG. 3 (a) is as shown in FIG. 3 (b). In the conventional technique, this signal is input to a low pass filter to obtain a varied voltage signal as shown in FIG. 3 (c). And this signal is regarded as constant and the electromagnetic coil 3
The detected voltage value V 0 is obtained by converting the current flowing in the voltage into a voltage.
しかし本発明では、以下に述べる手段で検出された電
流値を処理する。前述のパルス信号発生器１の出力信号
はインバータ13,21,抵抗14,コンデンサ15,アンドゲート
16,オアゲート21および設定デューティ信号発生器11と
で構成されるエッジ検出器７へ供給される。このエッジ
検出器７はまず、インバータ13,抵抗14,コンデンサ15,
アンドゲート16とで第３図（ｄ）で示すように立ち上が
りエッジだけを検出して細いパルス信号を生成する。ま
た、設定デューティ発生器11は第３図（ｅ）で示すよう
に、第３図（ａ）の立ち下がりエッジから次の立ち下が
りエッジを１周期とする99％（100％に近い）デューテ
ィの信号を発生する。この信号をインバーター21で反転
させたものと前述の第３図（ｄ）の信号をオアゲード12
に入力すると第３図（ｆ）の信号が得られる。そしてこ
の信号は電界効果トランジスタ17,コンデンサ18,増幅器
19で構成されるサンプルアンドホールド回路６の電界ト
ランジスタ17のゲートへ入力される。一方、電流検出手
段４で検出された信号は電界効果トランジスタ17のドレ
インに入力される。However, in the present invention, the current value detected by the means described below is processed. The output signal of the pulse signal generator 1 is the inverter 13, 21, the resistor 14, the capacitor 15, and the AND gate.
16, and is supplied to the edge detector 7 which is composed of an OR gate 21 and a set duty signal generator 11. First, the edge detector 7 includes an inverter 13, a resistor 14, a capacitor 15,
As shown in FIG. 3D, the AND gate 16 detects only the rising edge and generates a thin pulse signal. Further, as shown in FIG. 3 (e), the set duty generator 11 has a duty of 99% (close to 100%) with one cycle from the falling edge of FIG. 3 (a) to the next falling edge. Generate a signal. This signal is inverted by the inverter 21 and the signal shown in FIG.
The signal shown in FIG. 3 (f) is obtained by inputting to. And this signal is the field effect transistor 17, capacitor 18, amplifier
It is inputted to the gate of the electric field transistor 17 of the sample and hold circuit 6 constituted by 19. On the other hand, the signal detected by the current detecting means 4 is input to the drain of the field effect transistor 17.
電界効果トランジスタ17のソースにはコンデンサ18と
増幅器19の非反転端子が接続され、この増幅器19の出力
端子から本発明による検出電圧値V0が得られる。電界効
果トランジスタ17は第３図（ｄ）で示す“H"の時間だけ
オンして電流検出手段４の出力電圧をコンデンサ18へ充
電させる。“L"の時オフして電流検出手段４からの信号
をしゃ断し、次の“H"信号が来るまでコンデンサ18の電
圧を保持させる。つまり電界効果トランジスタ17のゲー
トが“L"の間は電流検出手段４の出力電圧が変化しても
検出される電圧V0は変化しないので第３図（ｇ）に示す
波形が得られる。また電磁コイル３のインダクタンスと
抵抗とによる時定数よりも高い周波数をパルス信号発生
器１が出力している場合は電磁コイル３に流れる実際の
電流値irと第３図（ｇ）のVL，VHとの関係は次式が成立
するため従来の技術で必要であった補正回路が 不要となる。The capacitor 18 and the non-inverting terminal of the amplifier 19 are connected to the source of the field effect transistor 17, and the detection voltage value V 0 according to the present invention is obtained from the output terminal of the amplifier 19. The field effect transistor 17 is turned on for the time "H" shown in FIG. 3 (d) to charge the capacitor 18 with the output voltage of the current detecting means 4. When it is "L", it is turned off to cut off the signal from the current detecting means 4, and the voltage of the capacitor 18 is held until the next "H" signal comes. That is, while the gate of the field effect transistor 17 is "L", the detected voltage V 0 does not change even if the output voltage of the current detecting means 4 changes, so that the waveform shown in FIG. 3 (g) is obtained. Further, when the pulse signal generator 1 outputs a frequency higher than the time constant due to the inductance and resistance of the electromagnetic coil 3, the actual current value ir flowing in the electromagnetic coil 3 and V L in FIG. 3 (g), Since the following equation holds for the relationship with V H , the correction circuit required in the conventional technology It becomes unnecessary.
なお本実施例では電磁コイルを流れる電流値の検出を
抵抗で行ったが他の要素を介してもよい。また、サンプ
ルアンドホールド回路を増幅器，コンデンサ，電界効果
トランジスタ以外で構成してもよいのは言うまでもな
い。In this embodiment, the value of the current flowing through the electromagnetic coil is detected by the resistor, but other elements may be used. Further, it goes without saying that the sample-and-hold circuit may be composed of other than an amplifier, a capacitor, and a field effect transistor.
以上説明したように本発明は電磁コイルの駆動信号の
同期して、電磁コイルに流れる電流値を処理することに
より、補正する必要のない電流値の検出ができる効果が
ある。As described above, the present invention has an effect that the current value that does not need to be corrected can be detected by processing the current value flowing through the electromagnetic coil in synchronization with the drive signal of the electromagnetic coil.
第１図は本発明の一実施例の機能ブロック図、第２図は
本発明の一実施例の構成図、第３図は第２図における信
号の波形である。 １……パルス信号発生器、２……駆動手段、３……電磁
コイル、４……電流値検出手段、６……サンプルアンド
ホールド回路、７……エッジ検出手段。FIG. 1 is a functional block diagram of an embodiment of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is a waveform of a signal in FIG. 1 ... Pulse signal generator, 2 ... Driving means, 3 ... Electromagnetic coil, 4 ... Current value detecting means, 6 ... Sample and hold circuit, 7 ... Edge detecting means.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浜井 祐治 広島県安芸郡府中町新地３番１号 マツ ダ株式会社内 (56)参考文献 特開 昭58−194308（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuji Hamai 3-3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (56) Reference JP-A-58-194308 (JP, A)
Claims (1)
周波数の少なくとも一方が変化するパルス信号発生手段
と、このパルス信号発生手段の出力信号の立ち上がりエ
ッジ，立ち下がりエッジの少なくとも一方を検出するエ
ッジ検出手段と、前記パルス信号発生手段の出力信号で
電磁コイルを駆動する駆動手段と、前記電磁コイルに流
れる電流を検出する電流値検出手段と該電流値検出手段
の出力信号を入力するサンプルアンドホールド手段とを
備えた電磁コイルの電流値処理装置において、前記エッ
ジ検出手段の出力信号で前記サンプルアンドホールド手
段を制御することを特徴とする電磁コイルの電流値処理
装置。1. A pulse width according to a predetermined operation amount,
Pulse signal generating means for changing at least one of frequencies, edge detecting means for detecting at least one of a rising edge and a falling edge of an output signal of the pulse signal generating means, and an electromagnetic coil with an output signal of the pulse signal generating means A current value processing device for driving the electromagnetic coil, a current value detecting means for detecting a current flowing through the electromagnetic coil, and a sample and hold means for inputting an output signal of the current value detecting means, A current value processing device for an electromagnetic coil, wherein the sample-and-hold means is controlled by an output signal of the edge detecting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9952587A JP2504769B2 (en) | 1987-04-21 | 1987-04-21 | Electromagnetic coil current value processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9952587A JP2504769B2 (en) | 1987-04-21 | 1987-04-21 | Electromagnetic coil current value processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63263705A JPS63263705A (en) | 1988-10-31 |
| JP2504769B2 true JP2504769B2 (en) | 1996-06-05 |
Family
ID=14249644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9952587A Expired - Lifetime JP2504769B2 (en) | 1987-04-21 | 1987-04-21 | Electromagnetic coil current value processing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504769B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022034681A (en) | 2020-08-19 | 2022-03-04 | 株式会社アイシン | Current detection device |
-
1987
- 1987-04-21 JP JP9952587A patent/JP2504769B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63263705A (en) | 1988-10-31 |
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