JPS59113771U - current measurement circuit - Google Patents
current measurement circuitInfo
- Publication number
- JPS59113771U JPS59113771U JP694383U JP694383U JPS59113771U JP S59113771 U JPS59113771 U JP S59113771U JP 694383 U JP694383 U JP 694383U JP 694383 U JP694383 U JP 694383U JP S59113771 U JPS59113771 U JP S59113771U
- Authority
- JP
- Japan
- Prior art keywords
- measurement circuit
- current measurement
- shunt resistor
- current
- constant
- 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
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は電流測定回路の原理を示す回路図、第２図は従
来の電流測定回路の一例を示す回路図、第３図はこの考
案による電流測定回路の一実施例を示す回路図、第４図
はこの考案の他の実施例を示す回路図である。
■・・・被測定電流、Ｒｓ・・・シャント抵抗、Ｖｏ・
・・電流測定電圧、■・・・電流表示用電圧計、Ａ・・
・演算増幅器、Ｒｉ、 Ｒｆ・・・帰還定数となる抵抗
、Ｒｖ・・・可変抵抗、１・・・センサ一部、２・・・
本体部。Fig. 1 is a circuit diagram showing the principle of a current measuring circuit, Fig. 2 is a circuit diagram showing an example of a conventional current measuring circuit, Fig. 3 is a circuit diagram showing an example of a current measuring circuit according to this invention, FIG. 4 is a circuit diagram showing another embodiment of this invention. ■... Current to be measured, Rs... Shunt resistance, Vo.
...Current measurement voltage, ■...Voltmeter for current display, A...
・Operation amplifier, Ri, Rf...Resistance serving as feedback constant, Rv...Variable resistor, 1...Part of sensor, 2...
Main body.
Claims (2)
端に生じる電圧によって電流を測定する電流測定回路に
おいて、上記シャント抵抗の両端に生じる電圧を増幅す
る演算増幅器を備えるとともに、この増幅器の増幅利得
を定めている帰還定数の一部を上記シャント抵抗と同じ
温度環境条件となる箇所に設け、この部分帰還定数の温
度変化によって上記シャント抵抗の温度変化により生じ
る測定誤差を補正するようにしたことを特徴とする電流
測定回路。(1) In a current measurement circuit that measures current by the voltage generated across a shunt resistor inserted in series in the current path to be measured, it is equipped with an operational amplifier that amplifies the voltage generated across the shunt resistor, and amplifies the amplifier. A part of the feedback constant that determines the gain is provided at a location that has the same temperature environment conditions as the shunt resistor, and measurement errors caused by temperature changes in the shunt resistor are corrected by temperature changes in this partial feedback constant. A current measurement circuit featuring:
て、演算増幅器の帰還定数の一部を可変定数とした
゛ことを特徴とする電流測定回路。(2) In the circuit of claim (1) for utility model registration, part of the feedback constant of the operational amplifier is a variable constant.
A current measurement circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP694383U JPS59113771U (en) | 1983-01-20 | 1983-01-20 | current measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP694383U JPS59113771U (en) | 1983-01-20 | 1983-01-20 | current measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59113771U true JPS59113771U (en) | 1984-08-01 |
Family
ID=30138483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP694383U Pending JPS59113771U (en) | 1983-01-20 | 1983-01-20 | current measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59113771U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012078328A (en) * | 2010-10-06 | 2012-04-19 | Yazaki Corp | Current detector capable of accurately measuring bus bar temperature |
| JP2013253841A (en) * | 2012-06-06 | 2013-12-19 | Fuji Electric Co Ltd | Current sensing circuit |
-
1983
- 1983-01-20 JP JP694383U patent/JPS59113771U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012078328A (en) * | 2010-10-06 | 2012-04-19 | Yazaki Corp | Current detector capable of accurately measuring bus bar temperature |
| JP2013253841A (en) * | 2012-06-06 | 2013-12-19 | Fuji Electric Co Ltd | Current sensing circuit |
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