JPH06160442A - Current detecting device - Google Patents
Current detecting deviceInfo
- Publication number
- JPH06160442A JPH06160442A JP30994692A JP30994692A JPH06160442A JP H06160442 A JPH06160442 A JP H06160442A JP 30994692 A JP30994692 A JP 30994692A JP 30994692 A JP30994692 A JP 30994692A JP H06160442 A JPH06160442 A JP H06160442A
- Authority
- JP
- Japan
- Prior art keywords
- current
- diode
- temperature characteristic
- detection circuit
- detecting 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.)
- Pending
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、交流電流を絶縁して検
出する電流検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device for detecting an alternating current by insulating it.
【0002】[0002]
【従来の技術】従来のこの種の電流検出装置について、
図面とともに説明する。図2は従来からある電流検出装
置であり、その構成はカレントトランス2とダイオード
ブリッジ3と前記カレントトランス2の負荷抵抗4で構
成され、その出力電圧6は、ピークホールド型の時定数
を持つローパスフィルタ5に接続されている。2. Description of the Related Art A conventional current detecting device of this type
A description will be given with reference to the drawings. FIG. 2 shows a conventional current detecting device, which is composed of a current transformer 2, a diode bridge 3, and a load resistor 4 of the current transformer 2, and its output voltage 6 is a low-pass having a peak-hold type time constant. It is connected to the filter 5.
【0003】以上のように構成された電流検出装置につ
いて、その動作を説明する。カレントトランス2で検出
された被測定電流1aに比例する交流電流1bは、ダイ
オードブリッジ3で整流され、負荷抵抗4で電圧変換さ
れる。その電圧6により充放電時定数の違うローパスフ
ィルタ5で被測定電流1aの実効値にほぼ比例する出力
電圧が得られる。The operation of the current detecting device configured as described above will be described. The alternating current 1b proportional to the measured current 1a detected by the current transformer 2 is rectified by the diode bridge 3 and converted into a voltage by the load resistor 4. The voltage 6 allows the low-pass filter 5 having a different charge / discharge time constant to obtain an output voltage substantially proportional to the effective value of the measured current 1a.
【0004】[0004]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、カレントトランス2の温度特性は、図3
(a)に示すように、雰囲気温度が上昇することによっ
てカレントトランス出力電流1bが上がる正温度特性が
あるため、電流検出回路の温度特性は図3(b)に示す
ように、負の温度特性を持ち、雰囲気温度によって電流
検出値に誤差が生じるという課題を有していた。However, in the above configuration, the temperature characteristic of the current transformer 2 is as shown in FIG.
As shown in (a), there is a positive temperature characteristic that the current transformer output current 1b rises as the ambient temperature rises. Therefore, the temperature characteristic of the current detection circuit has a negative temperature characteristic as shown in FIG. 3 (b). Therefore, there is a problem that an error occurs in the detected current value depending on the ambient temperature.
【0005】本発明は上記従来例の課題を解決するもの
で、電流検出回路の温度特性を補正しようとすることを
目的とするものである。The present invention is intended to solve the above-mentioned problems of the conventional example, and an object thereof is to correct the temperature characteristic of the current detection circuit.
【0006】[0006]
【課題を解決するための手段】上記課題を解決するため
に本発明は、ダイオードブリッジの出力と接地との間の
負荷抵抗と直列にダイオードを接続したものである。In order to solve the above-mentioned problems, the present invention comprises a diode connected in series with a load resistance between the output of a diode bridge and ground.
【0007】[0007]
【作用】本発明は、負荷抵抗と直列にダイオードを接続
することで、ダイオードの負温度特性によりカレントト
ランスの正温度特性を補正することができる。According to the present invention, by connecting the diode in series with the load resistance, the positive temperature characteristic of the current transformer can be corrected by the negative temperature characteristic of the diode.
【0008】[0008]
【実施例】以下本発明の一実施例における電流検出回路
について、図面とともに説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A current detection circuit according to an embodiment of the present invention will be described below with reference to the drawings.
【0009】図1は本発明の一実施例における電流検出
装置であり、カレントトランス8とダイオードブリッジ
9と前記カレントランス8の負荷抵抗10とそれと直列
に接続されたダイオード13で前段が構成されている。
その出力は、ピークホールド型の時定数を有するローパ
スフィルタ11に接続されている。FIG. 1 shows a current detecting device according to an embodiment of the present invention, in which a current transformer 8, a diode bridge 9, a load resistor 10 of the current lance 8 and a diode 13 connected in series thereto constitute a front stage. There is.
The output is connected to a low pass filter 11 having a peak hold type time constant.
【0010】以上のように構成された電流検出装置につ
いて、その動作を説明する。カレントトランス8で検出
された被測定電流7aに比例する交流電流7bは、ダイ
オードブリッジ9で整流され、負荷抵抗10とダイオー
ド順方向電圧降下12bにて電圧変換される。その電圧
12aにより充放電時定数の違うローパスフィルタで被
測定電流7aの実効値にほぼ比例する出力電圧が得られ
る。The operation of the current detecting device configured as described above will be described. The alternating current 7b proportional to the measured current 7a detected by the current transformer 8 is rectified by the diode bridge 9 and converted into a voltage by the load resistor 10 and the diode forward voltage drop 12b. With the voltage 12a, an output voltage that is substantially proportional to the effective value of the measured current 7a can be obtained by a low-pass filter having a different charge / discharge time constant.
【0011】ここで、ダイオード13の順方向電圧降下
の温度特性を説明する。ダイオード13の特性は図3
(c)に示すように温度が上昇することによって順方向
電圧降下12bが下がる負温度特性があるため、カレン
トトランス8の正の温度特性とダイオード13の負温度
特性が相殺され、本電流検出回路の温度特性が改善され
る。Here, the temperature characteristic of the forward voltage drop of the diode 13 will be described. The characteristics of the diode 13 are shown in FIG.
As shown in (c), there is a negative temperature characteristic in which the forward voltage drop 12b decreases as the temperature rises, so the positive temperature characteristic of the current transformer 8 and the negative temperature characteristic of the diode 13 are canceled out, and this current detection circuit The temperature characteristics of are improved.
【0012】[0012]
【発明の効果】本発明は上記説明から明らかなようにダ
イオードブリッジの出力と負荷抵抗と直列にダイオード
を設けることにより、電流検出装置の温度特性を補正す
ることができる。As is apparent from the above description, the present invention can correct the temperature characteristic of the current detecting device by providing a diode in series with the output of the diode bridge and the load resistance.
【図1】本発明の一実施例における電流検出装置の回路
図FIG. 1 is a circuit diagram of a current detection device according to an embodiment of the present invention.
【図2】従来の電流検出回路の回路図FIG. 2 is a circuit diagram of a conventional current detection circuit.
【図3】(a)はカレントトランスの温度特性図 (b)は電流検出回路の温度特性図 (c)はダイオードの順方向電圧降下の温度特性図3A is a temperature characteristic diagram of a current transformer, FIG. 3B is a temperature characteristic diagram of a current detection circuit, and FIG. 3C is a temperature characteristic diagram of a forward voltage drop of a diode.
8 カレントトランス 9 ダイオードブリッジ 13 ダイオード 10 負荷抵抗 8 Current transformer 9 Diode bridge 13 Diode 10 Load resistance
Claims (1)
と、コンデンサで構成され、前記カレントトランスの負
荷抵抗に直列に前記ダイオードを接続した電流検出装
置。1. A current detecting device comprising a current transformer, a diode, a resistor and a capacitor, wherein the diode is connected in series with a load resistor of the current transformer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30994692A JPH06160442A (en) | 1992-11-19 | 1992-11-19 | Current detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30994692A JPH06160442A (en) | 1992-11-19 | 1992-11-19 | Current detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06160442A true JPH06160442A (en) | 1994-06-07 |
Family
ID=17999258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30994692A Pending JPH06160442A (en) | 1992-11-19 | 1992-11-19 | Current detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06160442A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100618569B1 (en) * | 2004-10-21 | 2006-08-31 | 엘에스산전 주식회사 | Watt-hour meter and method with temperature sensor |
JP2009159745A (en) * | 2007-12-27 | 2009-07-16 | Toyo Electric Mfg Co Ltd | Current detection circuit |
CN102809682A (en) * | 2011-06-03 | 2012-12-05 | 新科实业有限公司 | Current sensing circuit, printed circuit board component and current sensor device |
CN105301348A (en) * | 2014-05-27 | 2016-02-03 | 深圳市方隅光电科技有限公司 | Temperature characteristic testing system and method of all-fiber optical current transformer |
-
1992
- 1992-11-19 JP JP30994692A patent/JPH06160442A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100618569B1 (en) * | 2004-10-21 | 2006-08-31 | 엘에스산전 주식회사 | Watt-hour meter and method with temperature sensor |
JP2009159745A (en) * | 2007-12-27 | 2009-07-16 | Toyo Electric Mfg Co Ltd | Current detection circuit |
CN102809682A (en) * | 2011-06-03 | 2012-12-05 | 新科实业有限公司 | Current sensing circuit, printed circuit board component and current sensor device |
CN105301348A (en) * | 2014-05-27 | 2016-02-03 | 深圳市方隅光电科技有限公司 | Temperature characteristic testing system and method of all-fiber optical current transformer |
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