CN203133137U - Distributed current shunt - Google Patents
Distributed current shunt Download PDFInfo
- Publication number
- CN203133137U CN203133137U CN 201320147063 CN201320147063U CN203133137U CN 203133137 U CN203133137 U CN 203133137U CN 201320147063 CN201320147063 CN 201320147063 CN 201320147063 U CN201320147063 U CN 201320147063U CN 203133137 U CN203133137 U CN 203133137U
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- CN
- China
- Prior art keywords
- shunt
- operational amplifier
- current
- branches
- input end
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- 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
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Abstract
The utility model discloses a distributed current shunt, comprising copper bars, shunt branches, operational amplifiers, resistors and a general operational amplifier, wherein the shunt branches are arranged between the two copper bars, the voltage ends on the shunt branches are connected with input ends of the operational amplifiers, output ends of the operational amplifiers are connected with a first input end of the general operational amplifier through the resistors, and the first input end of the general operational amplifier is further connected with a ground wire through a resistor; and a second input end of the general operational amplifier is connected with the ground wire, and an output voltage end of the general operational amplifier is formed by an output end and the ground. The distributed current shunt has the beneficial effects that: a single shunt branch is more uniform and stable in current distribution than the integral shunt, voltages at two ends of the shunt branches can be used for measuring currents passing through the branches more accurately and stably, the requirement on the current uniform distribution of the integral shunt is lowered, and the precision and stability of the integral shunt are improved. The current value obtained by averaging or adding the currents on the shunt branches can be more accurate; in addition, the shunt has better signal-to-noise ratio and resolution after amplifying, filtering and averaging the voltage output signals.
Description
Technical field
The utility model relates to a kind of current diverter; Particularly relate to a kind of distributing current diverter.
Background technology
Can select for use shunt or Hall current sensor to measure when needs are measured a very big DC current, the precision of Hall current sensor and the linearity are poorer than resistive shunt; Shunt is attempted to eliminate the error that the uncertainty of uncontrollable distribution of current causes by the optimization of physical construction; Shunt is the accurate resistance that can pass through big electric current, when electric current flows through shunt, the voltage of a millivolt level can appear at the shunt two ends, measure this voltage by the millivolt voltage table, again the voltage that records is converted into electric current, finishes the measurement of big electric current.Fig. 1 is the schematic diagram of existing typical shunt, as shown in Figure 1, comprises the resistor disc that is connected in parallel between two copper bars and the copper bar, and two electric current in-out ends and two measure electric current at the voltage end of ohmically voltage drop.But above-mentioned large-scale shunt is subjected to temperature and stress to cause that distribution of current is inhomogeneous easily, causes influencing measuring accuracy.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of distribution of current that do not require even, and can accurately measure the distributing current diverter of electric current.
The technical scheme that the utility model adopts is: a kind of distributing current diverter comprises copper bar, shunt branch road, operational amplifier, resistance and total operational amplifier; Between two described copper bars, be provided with the shunt branch road, voltage on the described shunt branch road is connected with the input end of operational amplifier, the output terminal of described operational amplifier is connected by the first input end of resistance with total operational amplifier, and the first input end of total operational amplifier also passes through resistance R
SBe connected with ground wire; Second input end of total operational amplifier is connected with ground wire, constitutes the output voltage of total current shunt between the output terminal of total operational amplifier and the ground.
Described shunt branch road is N, and N is the positive integer greater than 1, is connected in parallel between the described shunt branch road.
The beneficial effects of the utility model are: because each shunt branch road accomplishes easily that than whole shunt distribution of current is all even stable, shunt branch road both end voltage can represent the electric current by branch road more accurately and stably, effectively reduce thus the equally distributed requirement of whole shunt electric current, improved precision and the stability of whole shunt.Electric current on each shunt branch road of measuring averaged or addition and the ultimate current value of passing through whole shunt that obtains can be more accurate; In addition, the voltage output signal makes shunt have better signal to noise ratio (S/N ratio) and resolution through amplification, filtering and average.
Description of drawings
Fig. 1 is the schematic diagram of existing shunt;
Fig. 2 is the schematic diagram of the utility model distributing current diverter.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
As shown in Figure 2, the utility model distributing current diverter is the shunt branch road that is connected in parallel that the large shunt device is decomposed into several equal resistances; By electronic devices and components, as the instrument amplifier, operational amplifier and resistance etc., the electric current of each shunt branch road difference acquisition stream warp and voltage drop thereon, voltage drop value obtains total current value through average or addition; Shunt comprises, copper bar, shunt branch road, operational amplifier, resistance and total operational amplifier; Described shunt branch road is N, and N is the positive integer greater than 1, is connected in parallel between the described shunt branch road; Voltage output signal on the described shunt branch road is amplified through instrument amplifier and is filteredly had better signal to noise ratio (S/N ratio) and a resolution; The output terminal of these instrument operational amplifiers is connected by the first input end of resistance with total operational amplifier, and the first input end of total operational amplifier also passes through resistance R
SBe connected with ground wire; Second input end of total operational amplifier is connected with ground wire, constitute the output voltage of total current shunt between the output terminal of total operational amplifier and the ground, each branch road average value of output voltage of this output voltage and all is directly proportional, just and the total current by all branch roads be directly proportional.
The utility model can reduce owing to adopt the method for measuring each shunt branch current because the influence of the drift that temperature and stress cause; Each shunt branch road is realized the even distribution of electric current easily than big shunt; Thereby make simply, convenient, the easier high precision of making.
Claims (2)
1. a distributing current diverter is characterized in that, comprises copper bar, shunt branch road, operational amplifier, resistance and total operational amplifier; Between two described copper bars, be provided with the shunt branch road, voltage on the described shunt branch road is connected with the input end of operational amplifier, the output terminal of described operational amplifier is connected by the first input end of resistance with total operational amplifier, and the first input end of total operational amplifier also passes through resistance R
SBe connected with ground wire; Second input end of total operational amplifier is connected with ground wire, constitutes the output voltage of total current shunt between the output terminal of total operational amplifier and the ground.
2. distributing current diverter according to claim 1 is characterized in that, described shunt branch road is N, and N is the positive integer greater than 1, is connected in parallel between the described shunt branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147063 CN203133137U (en) | 2013-03-28 | 2013-03-28 | Distributed current shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147063 CN203133137U (en) | 2013-03-28 | 2013-03-28 | Distributed current shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133137U true CN203133137U (en) | 2013-08-14 |
Family
ID=48941108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320147063 Expired - Lifetime CN203133137U (en) | 2013-03-28 | 2013-03-28 | Distributed current shunt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203133137U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122426A (en) * | 2014-07-25 | 2014-10-29 | 桐乡市伟达电子有限公司 | High-precision sampling diverter and production method thereof |
-
2013
- 2013-03-28 CN CN 201320147063 patent/CN203133137U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122426A (en) * | 2014-07-25 | 2014-10-29 | 桐乡市伟达电子有限公司 | High-precision sampling diverter and production method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
|
| CX01 | Expiry of patent term |