CN202886448U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN202886448U CN202886448U CN 201220511258 CN201220511258U CN202886448U CN 202886448 U CN202886448 U CN 202886448U CN 201220511258 CN201220511258 CN 201220511258 CN 201220511258 U CN201220511258 U CN 201220511258U CN 202886448 U CN202886448 U CN 202886448U
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Abstract
The utility model discloses a current detection circuit. One terminal of a resistor R1 is connected with a positive terminal CSN of a measuring point, and the other terminal is respectively connected with a wiring terminal 2 of a differential amplification circuit U1, one terminal of a proportion resistor R3, and one terminal of a filter capacitor C2. One terminal of a compensation resistor R2 is connected with a negative terminal CSP of the measuring point, and the other terminal is respectively connected with a wiring terminal 3 of the differential amplification circuit U1, one terminal of a proportion resistor R4, and one terminal of a filter capacitor C1. The other terminal of the proportion resistor R3 is respectively connected with a wiring terminal 6 of the differential amplification circuit U1 and a wiring terminal 1 of a variable resistor WIF. The other terminal of the filter capacitor C2 is connected with the ground. The other terminal of the proportion resistor R4 is connected with the ground. The other terminal of the filter capacitor C1 is connected with the ground. A wiring terminal 4 of the differential amplification circuit U1 is connected with a dual-power supply input -U and one terminal of the filter capacitor C4 respectively. The other terminal of the filter capacitor C4 is connected with the ground. A wiring terminal 7 of the differential amplification circuit U1 is connected with a dual-power supply input +U and one terminal of a filter capacitor C3 respectively. The other terminal of the filter capacitor C3 is connected with the ground. A wiring terminal 2 of the variable resistor WIF is connected with a resistor R5, and a wiring terminal 3 is a current signal output Uo. The other terminal of the resistor R5 is connected with the ground. The current detection circuit not only can reduce the current detection cost, but also can improve the detection precision and the mounting flexibility of the detection circuit.
Description
Technical field
The utility model relates to the shunt current detection technology field of power electronic product, relates in particular to a kind of current detection circuit.
Background technology
Existing current detecting roughly can be divided two kinds of detection modes: shunt current detecting mode and Hall element current detecting.
Wherein, described shunt current detecting mode: shunt is measured DC current and is used, and the principle that produces voltage according to DC current during by resistance at the resistance two ends is made.The shunt current detecting need to access shunt in the current return, operation inconvenience; The different range of current of shunt must be different the shunt specification, measurement range is restricted; Shunt is whole general with copper, and along with the price increase of copper material, its price also changes quite large.
Described Hall element current detecting mode: Hall element is to utilize electric current to cause by magnetic field that Hall components and parts magnetic field is strong and weak to change, and by linear amplifier and other auxiliary circuits and the output current value signal.Hall current sensor must suitably be selected according to the specified effective value of tested electric current the product of different specifications.Tested electric current exceeds the quata for a long time, can damage last utmost point power tube (referring to the magnetic compensation formula), and generally speaking, 2 times overload current duration must not be above 1 minute; So that it is quoted is range limited.
Yet in existing two kinds of current detecting processes, the designer finds prior art, and there are the following problems:
The cost height of the current detecting of existing shunt current detection technology and Hall element current detection technology is higher, precision is not high and install dumb.
The utility model content
Embodiment of the present utility model provides a kind of current detection circuit.For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of current detection circuit that the utility model provides comprises: compensating resistance R1, R2, proportion resistor R3 and R4, stake resistance R5, filter capacitor C1, C2, C3 and C4, differential amplifier circuit U1, variable resistor WIF;
Described compensating resistance R1 one end links to each other with measurement point anode CSN, the other end respectively with the terminals 2 of described differential amplifier circuit U1, described proportion resistor R3 one end, described filter capacitor C2 one end links to each other;
Described compensating resistance R2 one end links to each other with measurement point negative terminal CSP, the other end respectively with the terminals 3 of described differential amplifier circuit U1, described proportion resistor R4 one end, described filter capacitor C1 one end links to each other;
The described proportion resistor R3 other end respectively with the terminals 6 of described differential amplifier circuit U1, the terminals 1 of described variable resistor WIF link to each other;
Described filter capacitor C2 other end ground connection;
Described proportion resistor R4 other end ground connection;
Described filter capacitor C1 other end ground connection;
The terminals 4 of described differential amplifier circuit U1 respectively with dual power supply input-U, described filter capacitor C4 one end links to each other; Described filter capacitor C4 other end ground connection;
The terminals 7 of described differential amplifier circuit U1 respectively with dual power supply input+U, described filter capacitor C3 one end links to each other; Described filter capacitor C3 other end ground connection;
Described resistance R 5 other end ground connection.
Wherein, described compensating resistance R1 and R2 and measured electric current row's close contact and insulation, described compensating resistance R1 and R2 are by measured electric current row's current monitoring point conducting.
It is identical that described compensating resistance R1 and R2 and measured electric current row's resistance temperature are floated coefficient.
Described compensating resistance R1 is identical with measured electric current row's material with R2.
A kind of current detection circuit that the utility model provides links to each other with measurement point anode CSN by resistance R 1 one ends, the other end respectively with the terminals 2 of differential amplifier circuit U1, proportion resistor R3 one end, filter capacitor C2 one end links to each other; Compensating resistance R2 one end links to each other with measurement point negative terminal CSP, the other end respectively with the terminals 3 of differential amplifier circuit U1, proportion resistor R4 one end, filter capacitor C1 one end links to each other; Proportion resistor R 3 other ends respectively with the terminals 6 of differential amplifier circuit U1, the terminals 1 of variable resistor WIF link to each other; Filter capacitor C2 other end ground connection; Proportion resistor R4 other end ground connection; Filter capacitor C1 other end ground connection; The terminals 4 of differential amplifier circuit U1 respectively with dual power supply input-U, filter capacitor C4 one end links to each other; Filter capacitor C4 other end ground connection; The terminals 7 of differential amplifier circuit U1 respectively with dual power supply input+U, filter capacitor C3 one end links to each other; Filter capacitor C3 other end ground connection; Terminals 2 one ends of variable resistor WIF link to each other with resistance R 5, and terminals 3 are current signal output Uo; Resistance R 5 other end ground connection.Adopt the utility model not only can reduce the cost of current detecting, improve accuracy of detection, can also improve the Installation Flexibility of testing circuit simultaneously.
Description of drawings
A kind of current detection circuit structural representation that Fig. 1 provides for the utility model embodiment;
The detection scheme of installation that Fig. 2 arranges tested electric current for a kind of current detection circuit that the utility model embodiment provides.
Embodiment
Below in conjunction with accompanying drawing a kind of current detection circuit that the utility model embodiment provides is described in detail.
As shown in Figure 1, be a kind of current detection circuit that the utility model provides, this circuit comprises: compensating resistance R1, R2, proportion resistor R3 and R4, stake resistance R5, filter capacitor C1, C2, C3 and C4, differential amplifier circuit U1, variable resistor WIF;
Described compensating resistance R1 one end links to each other with measurement point anode CSN, the other end respectively with the terminals 2 of described differential amplifier circuit U1, described proportion resistor R3 one end, described filter capacitor C2 one end links to each other;
Described compensating resistance R2 one end links to each other with measurement point negative terminal CSP, the other end respectively with the terminals 3 of described differential amplifier circuit U1, described proportion resistor R4 one end, described filter capacitor C1 one end links to each other;
The described proportion resistor R3 other end respectively with the terminals 6 of described differential amplifier circuit U1, the terminals 1 of described variable resistor WIF link to each other;
Described filter capacitor C2 other end ground connection;
Described proportion resistor R4 other end ground connection;
Described filter capacitor C1 other end ground connection;
The terminals 4 of described differential amplifier circuit U1 respectively with dual power supply input-U, described filter capacitor C4 one end links to each other; Described filter capacitor C4 other end ground connection;
The terminals 7 of described differential amplifier circuit U1 respectively with dual power supply input+U, described filter capacitor C3 one end links to each other; Described filter capacitor C3 other end ground connection;
Described resistance R 5 other end ground connection.
In the utility model ,+U and-U is the dual power supply input of U1; CSN and CSP are respectively the measurement point positive and negative; R1 and R2 are compensating resistance; Uo is current signal output; WIF is variable resistor, is used for calibration output signal U o; GND is ground; C1, C2, C3 and C4 are filter capacitor.
Its object test installation form is applicable to the current detecting of dissimilar electric current rows' different occasions as shown in Figure 2; Key point is compensating resistance R1 and R2, need to arrange close contact and insulation with measured electric current, so just required R1 and R2 can be attached to flexible material, to adapt to different measurement surfaces, and compensating resistance need to have approaching or identical resistance temperature with electric current row and float FACTOR P PM, namely be preferably with electric current row and have identical material resistance, for example electric current row is copper bar, then resistance material is copper, flexible material surface cloth can the copper layer, make a needs resistance, so just can obtain having the resistance that identical resistance temperature is floated FACTOR P PM with copper bar, fully be attached to tested electric current row surface, current detecting carried out temperature compensation, thereby realize that current detecting reaches degree of precision.CSP and CSN are electric current row's current monitoring point, contact with electric current row conducting.
Its course of work is described below: electric current flows through from electric current row, produces voltage difference in this section of CSP to CSN electric current row length, and this is the voltage signal Upn a little less than in the of.
Upn=I*ρ*L/S （1）
Wherein: I: the electric current of electric current current drainage
ρ: the resistivity of electric current row material
The length of L:CSP to CSN current monitoring point
S: electric current row cross-sectional area
The ratio of compensating resistance R1 and R2 and proportion resistor R3 and R4 rationally is set, and then it amplifies output current signal
Uo=Upn*R3/R1 （2）
In formula (1) substitution (2)
Uo=I*ρ*L*R3/（S*R1） （3）
Be not difficult to find out that from formula (3) ρ, L, S, R3 and R1 are definite value, then current signal Uo is directly proportional with electric current current drainage excess current.
By adjusting R1, R2, R3 and R4 resistance, can realize the enlargement factor adjustment, to adapt to different range of current.
The utility model innovation ground has merged shunt and has detected the flexible of electric current principle and Hall detection electric current; Easy for installation, with low cost, greatly saved cost; And the use differential amplifier circuit adopts the compensating resistance way, has improved the precision and the reliability that detect.
Need to prove that the tested electric current row described in the utility model can be the copper bar of rectangular parallelepiped, can also be the tested electric current row of other any shapes or demand.
The above; it only is embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion by described protection domain with claim.
Claims (4)
1. a current detection circuit is characterized in that, comprising: compensating resistance R1, R2, proportion resistor R3 and R4, stake resistance R5, filter capacitor C1, C2, C3 and C4, differential amplifier circuit U1, variable resistor WIF;
Described compensating resistance R1 one end links to each other with measurement point anode CSN, the other end respectively with the terminals 2 of described differential amplifier circuit U1, described proportion resistor R3 one end, described filter capacitor C2 one end links to each other;
Described compensating resistance R2 one end links to each other with measurement point negative terminal CSP, the other end respectively with the terminals 3 of described differential amplifier circuit U1, described proportion resistor R4 one end, described filter capacitor C1 one end links to each other;
The described proportion resistor R3 other end respectively with the terminals 6 of described differential amplifier circuit U1, the terminals 1 of described variable resistor WIF link to each other;
Described filter capacitor C2 other end ground connection;
Described proportion resistor R4 other end ground connection;
Described filter capacitor C1 other end ground connection;
The terminals 4 of described differential amplifier circuit U1 respectively with dual power supply input-U, described filter capacitor C4 one end links to each other; Described filter capacitor C4 other end ground connection;
The terminals 7 of described differential amplifier circuit U1 respectively with dual power supply input+U, described filter capacitor C3 one end links to each other; Described filter capacitor C3 other end ground connection;
Terminals 2 one ends of described variable resistor WIF link to each other with described resistance R 5, and terminals 3 are current signal output Uo;
Described resistance R 5 other end ground connection.
2. current detection circuit according to claim 1 is characterized in that, described compensating resistance R1 and R2 and measured electric current row's close contact and insulation, and described compensating resistance R1 and R2 are by measured electric current row's current monitoring point conducting.
3. current detection circuit according to claim 2 is characterized in that, it is identical that described compensating resistance R1 and R2 and measured electric current row's resistance temperature are floated coefficient.
4. current detection circuit according to claim 3 is characterized in that, described compensating resistance R1 is identical with measured electric current row's material with R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511258 CN202886448U (en) | 2012-10-08 | 2012-10-08 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511258 CN202886448U (en) | 2012-10-08 | 2012-10-08 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202886448U true CN202886448U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220511258 Expired - Lifetime CN202886448U (en) | 2012-10-08 | 2012-10-08 | Current detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034938A (en) * | 2014-05-28 | 2014-09-10 | 杭州电子科技大学 | Current detection circuit in electronic voltage transformer |
| CN109030907A (en) * | 2017-06-09 | 2018-12-18 | 北京普源精电科技有限公司 | A kind of current probe and its control method |
-
2012
- 2012-10-08 CN CN 201220511258 patent/CN202886448U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034938A (en) * | 2014-05-28 | 2014-09-10 | 杭州电子科技大学 | Current detection circuit in electronic voltage transformer |
| CN104034938B (en) * | 2014-05-28 | 2017-02-08 | 杭州电子科技大学 | Current detection circuit in electronic voltage transformer |
| CN109030907A (en) * | 2017-06-09 | 2018-12-18 | 北京普源精电科技有限公司 | A kind of current probe and its control method |
| CN109030907B (en) * | 2017-06-09 | 2022-02-25 | 北京普源精电科技有限公司 | Current probe and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
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| CX01 | Expiry of patent term |