CN212845569U - Novel current-voltage converter of shielded - Google Patents
Novel current-voltage converter of shielded Download PDFInfo
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- CN212845569U CN212845569U CN202021575694.9U CN202021575694U CN212845569U CN 212845569 U CN212845569 U CN 212845569U CN 202021575694 U CN202021575694 U CN 202021575694U CN 212845569 U CN212845569 U CN 212845569U
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Abstract
The utility model belongs to the technical field of electrician's electronic instrument. A novel shielded current-to-voltage converter is characterized in that: the device comprises a standard resistor R, a voltage amplifier and a shielding box, wherein the standard resistor R is connected with the input end of the voltage amplifier in parallel; the standard resistor R and the voltage amplifier are both positioned in the shielding box; the standard resistance R is 0.1 Ω or 0.02 Ω. The voltage amplifier is a high-precision voltage amplifier. The shielding box is made of red copper sheets, and the thickness of the red copper sheets is 0.5 mm. The utility model provides a precision measurement problem of electric current, the converter still possesses characteristics small, light in weight, the energy consumption is low, the interference killing feature is strong simultaneously.
Description
Technical Field
The utility model belongs to the technical field of electrician's electronic instrument, concretely relates to novel current-voltage converter (the conversion of electric current commentaries on classics voltage device).
Background
At present, the precision measurement of large current generally uses a current transformer and a current comparator to convert the large current (such as 1000A) into 1A or 5A. At present, in China, 1A or 5A is generally used, namely the secondary current of the equipment is 1A or 5A, in order to measure the current of 1A or 5A, a precision resistor is generally connected in series in a loop, for example, 1 Ω or 0.2 Ω, so that the current of 1A or 5A is converted into 1V voltage, and then the voltage of 1V is measured, so that the secondary current can be known, and a large current value of the primary current can be known.
The prior art has the defects of large volume, heavy weight and high energy consumption.
Disclosure of Invention
An object of the utility model is to provide a novel current-voltage converter of shielded has the characteristics that the energy consumption is low, the interference killing feature is strong.
In order to achieve the above object, the utility model adopts the following technical scheme: a novel shielded current-to-voltage converter is characterized in that: the device comprises a standard resistor R, a voltage amplifier and a shielding box, wherein the standard resistor R is connected with the input end of the voltage amplifier in parallel; the standard resistor R and the voltage amplifier are both positioned in the shielding box; the standard resistance R is 0.1 Ω or 0.02 Ω.
The voltage amplifier is a high-precision voltage amplifier.
The shielding box is made of red copper sheets, and the thickness of the red copper sheets is 0.5 mm.
The utility model discloses to the current value that this kind of mutual-inductor secondary of 1A, 5A is commonly used, there is the defect with traditional measuring method, improved this traditional mode, specifically be exactly with little standard resistance, to 5A, use 0.02 Europe's resistance as sampling resistance, trun into the 5A electric current into 100mV voltage, then add a high accuracy amplifier again, enlarge 1V or 10V to 0.1V, standard resistance's consumption just reduces to 0.5W by 5W like this.
The utility model discloses a key point is:
1. firstly, a resistor with smaller resistance value is used for converting the current of 5A into smaller voltage, such as 0.1V in the example;
2. amplifying the small 0.1V voltage to 1V or 10V by a high-precision voltage amplifier;
3. the output voltage of 1V or 10V is higher, which is beneficial to reading and using of subsequent instruments.
4. Adopt the shielding box, improved the interference killing feature, whole subassembly is sealed to be a whole, has improved the wholeness ability.
The beneficial effects of the utility model reside in that: the problem of the precision measurement of electric current is solved, and the converter still possesses small, light in weight, the energy consumption is low, the strong characteristics of interference killing feature simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-shielding box.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a shielded novel current-to-voltage converter includes a standard resistor R, a voltage amplifier, and a shielding box 1, wherein the standard resistor R is connected in parallel with an input end of the voltage amplifier; the standard resistor R and the voltage amplifier are both positioned in the shielding box 1, and the input end of the standard resistor R and the output end of the voltage amplifier are both positioned outside the shielding box 1; the standard resistance R is 0.1 Ω or 0.02 Ω.
The voltage amplifier is a high-precision voltage amplifier. The standard resistor R reduces the voltage value by N times (e.g., 10 times, 100 times), and the voltage amplifier amplifies the corresponding voltage value by N times.
The shielding box is made of red copper sheets, and the thickness of the red copper sheets is about 0.5 mm.
See in particular fig. 1, at a current (I) of 5A0) For example.
R is 0.02 omega, the amplification factor of the voltage amplifier is 10 or 100 times, thus the 5A current is converted into 1V or 10V voltage (the output end V of the voltage amplifier)0) To facilitate reading of subsequent meters.
The current input to 5A is converted into 0.1V voltage through a standard resistor R of 0.02 omega, and then the voltage is amplified by a high-precision voltage amplifier by a magnification factor which can be set to be 10 times or 100 times, the implementation example gives the 10 times, and the measured data is as shown in Table 1:
TABLE 1
| Input current (I)0) | Output voltage (V)0) |
| 5A | 1.000010V |
| 2.5A | 0.500005V |
| 0.5A | 0.100002V |
The conversion precision can reach 5 x 10-5. The power consumption of the standard resistor is reduced from 5W to 0.5W.
Claims (3)
1. A novel shielded current-to-voltage converter is characterized in that: the device comprises a standard resistor R, a voltage amplifier and a shielding box, wherein the standard resistor R is connected with the input end of the voltage amplifier in parallel; the standard resistor R and the voltage amplifier are both positioned in the shielding box; the standard resistance R is 0.1 Ω or 0.02 Ω.
2. The shielded current-to-voltage converter of claim 1, wherein: the voltage amplifier is a high-precision voltage amplifier.
3. The shielded current-to-voltage converter of claim 1, wherein: the shielding box is made of red copper sheets, and the thickness of the red copper sheets is 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021575694.9U CN212845569U (en) | 2020-07-31 | 2020-07-31 | Novel current-voltage converter of shielded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021575694.9U CN212845569U (en) | 2020-07-31 | 2020-07-31 | Novel current-voltage converter of shielded |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212845569U true CN212845569U (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021575694.9U Active CN212845569U (en) | 2020-07-31 | 2020-07-31 | Novel current-voltage converter of shielded |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212845569U (en) |
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2020
- 2020-07-31 CN CN202021575694.9U patent/CN212845569U/en active Active
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