JP3063767U - Current detection circuit using differential amplification means - Google Patents
Current detection circuit using differential amplification meansInfo
- Publication number
- JP3063767U JP3063767U JP1999004325U JP432599U JP3063767U JP 3063767 U JP3063767 U JP 3063767U JP 1999004325 U JP1999004325 U JP 1999004325U JP 432599 U JP432599 U JP 432599U JP 3063767 U JP3063767 U JP 3063767U
- Authority
- JP
- Japan
- Prior art keywords
- differential amplifier
- current detection
- input
- circuit
- current
- 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
- Amplifiers (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
(57)【要約】
【課題】温度特性の良好な差動増幅手段を用いた電流検
出回路を比較的簡単な回路で実現する。
【解決手段】電流を検出しようとする回路に直列に挿入
した電流検出抵抗１の両端の電位を、各々、分圧抵抗
３、４、５、６で分圧してから差動増幅手段２に入力
し、差動増幅手段２の電源を電流検出抵抗１のいずれか
の端子から取る。また、差動増幅手段２をあらかじめ不
平衡状態にさせる手段として、定電流回路７を分圧抵抗
４に並列に接続した。
(57) Abstract: A current detection circuit using a differential amplifier having good temperature characteristics is realized by a relatively simple circuit. Kind Code: A1 A potential at both ends of a current detecting resistor inserted in series in a circuit for detecting a current is divided by voltage dividing resistors, and then input to a differential amplifier. Then, the power of the differential amplifier 2 is taken from any terminal of the current detection resistor 1. Further, a constant current circuit 7 is connected in parallel to the voltage dividing resistor 4 as a means for bringing the differential amplifier 2 into an unbalanced state in advance.
Description
【０００１】[0001]
従来、回路の電流を検出する目的で、その回路に直列に挿入した電流検出抵抗 の電圧降下を差動増幅手段で検出しようとすると、差動増幅手段のために別電源 を設けるか、それを避けるためには、特性の揃った２個の定電圧源で、電流検出 抵抗の両端の電位を各々低下させた後、差動増幅手段に入力する必要があった。 Conventionally, to detect the voltage drop of the current detection resistor inserted in series with the circuit for the purpose of detecting the current of the circuit, if a differential amplifier is used to detect the voltage drop, a separate power supply must be provided for the differential amplifier. In order to avoid this, it is necessary to reduce the potentials at both ends of the current detection resistor by using two constant voltage sources having the same characteristics, and then to input the potential to the differential amplifier.
【０００２】[0002]
上記の方法では、２個の定電圧源の特性を揃えるのが困難であり、それが実現 できたとしても、部品点数が多かった。又、電源入力電圧がそれら定電圧源の電 圧以下になると、電流検出が不可能になる問題点を有していた。また、定電圧源 の代わりに抵抗分圧を使用し、且つ、差動増幅手段の出力の状態が設定電流値を 境に反転するよう動作させる目的で差動増手段の２つの入力電位に前もって差を 持たせようと、２組の抵抗分圧器の分圧比に差を持たせる場合は、その差動入力 間電位差が電源入力電圧の変動により変動するという問題点を有していた。 With the above method, it was difficult to make the characteristics of the two constant voltage sources uniform, and even if this could be achieved, the number of components was large. Further, when the power supply input voltage is lower than the voltage of the constant voltage source, there is a problem that the current cannot be detected. In addition, in order to use a resistive voltage divider in place of the constant voltage source and operate so that the output state of the differential amplifying means is inverted around the set current value, the two input potentials of the differential amplifying means are set in advance. If the voltage division ratio of the two resistive voltage dividers is made different to provide a difference, there is a problem that the potential difference between the differential inputs fluctuates due to the fluctuation of the power supply input voltage.
【０００３】[0003]
上記問題点を解決するために、電流検出抵抗１の両端の電位を、分圧抵抗３、 ４、５、６から成る２組の、分圧比が等しい抵抗分圧器で各々分圧した後、差動 増輻手段２に入力した。また、差動増幅手段２の入力端子間に電位差を持たせる ための手段として、分圧抵抗４に並列に定電流源７を接続した。 In order to solve the above problem, the potentials at both ends of the current detection resistor 1 are divided by two sets of voltage dividers 3, 4, 5, and 6 having the same voltage division ratio, and then the potential difference is obtained. Input to dynamic radiator 2. As a means for providing a potential difference between the input terminals of the differential amplifying means 2, a constant current source 7 is connected in parallel with the voltage dividing resistor 4.
【０００４】[0004]
２個の特性の揃った定電圧源が不要になり、回路が簡単で、部品点数が減った にもかかわらず、電源入力電圧の変動に強く、定電流源と差動増幅手段が動作可 能な電源電圧以上であれば、設定された検出電流値は、電源入力電圧の影響を受 けない。また、差動増幅手段を使用しているため温度特性が良好であり、高精度 な電流検出が可能になる。 Eliminates the need for two constant voltage sources with uniform characteristics, simplifies the circuit, reduces the number of components, but is resistant to fluctuations in power supply input voltage, allowing the constant current source and differential amplifier to operate. If the power supply voltage is equal to or higher than the minimum power supply voltage, the set detection current value is not affected by the power supply input voltage. Further, since the differential amplifier is used, the temperature characteristics are good, and high-precision current detection becomes possible.
【図１】本考案の回路図である。FIG. 1 is a circuit diagram of the present invention.
１ 電流検出抵抗 ２ 差動増幅手段 ３ 分圧抵抗 ４ 分圧抵抗 ５ 分圧抵抗 ６ 分圧抵抗 ７ 定電流源 ８ 電源入力 ９ 電源出力 １０ 接地 １１ 接地 １２ 差動出力１ １３ 差動出力２ DESCRIPTION OF SYMBOLS 1 Current detection resistor 2 Differential amplification means 3 Dividing resistor 4 Dividing resistor 5 Dividing resistor 6 Dividing resistor 7 Constant current source 8 Power input 9 Power output 10 Ground 11 Ground 12 Differential output 1 13 Differential output 2
Claims (1)
電位を各々２組の分圧抵抗により分圧し、差動増幅手段
の２つの入力端子に各々入力することにより、差動増幅
手段の電源を電流検出抵抗の入力側から取り、また、差
動増幅手段の２つの入力端子に前もって電位差を持たせ
る手段として、差動増幅手段の１つの入力端子に定電流
源を接続した電流検出回路。An input potential and an output potential of a current detection resistor are each divided by two sets of voltage dividing resistors, and input to two input terminals of the differential amplifier, respectively. A power supply is supplied from the input side of the current detection resistor, and a means for providing a potential difference between two input terminals of the differential amplifier means in advance by connecting a constant current source to one input terminal of the differential amplifier means. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1999004325U JP3063767U (en) | 1999-05-11 | 1999-05-11 | Current detection circuit using differential amplification means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1999004325U JP3063767U (en) | 1999-05-11 | 1999-05-11 | Current detection circuit using differential amplification means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP3063767U true JP3063767U (en) | 1999-11-26 |
Family
ID=43197459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1999004325U Expired - Lifetime JP3063767U (en) | 1999-05-11 | 1999-05-11 | Current detection circuit using differential amplification means |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3063767U (en) |
-
1999
- 1999-05-11 JP JP1999004325U patent/JP3063767U/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH08305451A (en) | Balancing circuit of power supply | |
| WO2015153176A1 (en) | Current sensing system and method | |
| MY121022A (en) | High input impedance single ended, low supply voltage magnetoresistive preamplifier circuits | |
| JP3063767U (en) | Current detection circuit using differential amplification means | |
| JPH0770935B2 (en) | Differential current amplifier circuit | |
| KR20030011833A (en) | Ft multiplier amplifier with low-power biasing circuit | |
| US20030052737A1 (en) | Operational amplifier in which the idle current of its output push-pull transistors is substantially zero | |
| JPH02134575A (en) | Power supply current measuring circuit | |
| JPH0432081U (en) | ||
| CN216485222U (en) | High-precision circuit sampling circuit | |
| JPS62227204A (en) | Differential amplifier | |
| SU997010A1 (en) | Bipolar reference voltage source | |
| JPS6041884B2 (en) | differential amplifier circuit | |
| RU12757U1 (en) | TENSION REPEATER | |
| JPH0642250Y2 (en) | Negative output voltage stabilized power supply circuit | |
| JP2712310B2 (en) | Current mirror circuit | |
| CN103076838B (en) | Current mirror and complementary bias method thereof | |
| JPH0495406A (en) | Differential amplifier circuit | |
| JP2514235Y2 (en) | Amplifier circuit | |
| US20050007094A1 (en) | Two wire hall device output detection circuit | |
| JPS584327Y2 (en) | amplifier circuit | |
| JP2524830B2 (en) | Constant current circuit | |
| JPS5818334Y2 (en) | amplifier circuit | |
| SU1401559A1 (en) | Broad-band current amplifier | |
| JPS61153778A (en) | Analog arithmetic circuit |