CN208795790U - A kind of High-accuracy direct current sensor - Google Patents
A kind of High-accuracy direct current sensor Download PDFInfo
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- CN208795790U CN208795790U CN201821332107.6U CN201821332107U CN208795790U CN 208795790 U CN208795790 U CN 208795790U CN 201821332107 U CN201821332107 U CN 201821332107U CN 208795790 U CN208795790 U CN 208795790U
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- current sensor
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Abstract
The utility model discloses a kind of High-accuracy direct current sensors, including difference amplifier, the input terminal of the differential amplifier inputs and signal connects, difference amplifier output end is connect by level-one precision U/F converter with isolating coupler, isolating coupler output end is connect by F/U converter with amplifier OPA, amplifier OPA output signal.The Zero drift in main amplifier of the utility model solution current acquisition conversion sensor, the precision for improving direct current transducer reaches 0.1%, meets the use occasion high for required precision, it is conveniently used for the high-precision isolation acquisition of electricity and non electrical quantity in industrial control field, is conducive to use.
Description
Technical field
The utility model relates to a kind of sensor field, specifically a kind of High-accuracy direct current sensor.
Background technique
Sensor is a kind of detection device, can experience measured information, and the information that can will be experienced, by a set pattern
Rule is for conversion into electric signal or the information output of other required forms, to meet transmission, processing, storage, the display, record of information
With control etc. require.The characteristics of sensor includes: micromation, digitlization, intelligence, multifunction, systematization, networking.It
It is to realize the automatic primary link detected and automatically control.The presence and development of sensor allow object to have tactile, the sense of taste and smell
The sense organs such as feel, allow object slowly to become to have lived.Generally according to its basic perceptional function be divided into temperature-sensitive element, light-sensitive element,
Gas sensor, force sensing element, magneto sensor, dew cell, acoustic sensor, radioactive ray sensing element, color sensor and the quick member of taste
Ten major class such as part.During modern industrial production especially automated production, life is monitored and controlled with various sensors
Parameters during production make equipment work in normal condition or optimum state, and product are made to reach best quality.In the past
The isolation acquisition of DC quantity needs to install additional tune in application circuit using hall effect sensor such as LEM company LV25-P
There is null offset to offset to wait because of the influence of earth magnetism, remanent magnetism and temperature in nulling loop.In use for some time, due to Hall
, there is null offset in the influence of sensor remanent magnetism and temperature, and measurement accuracy decline can not meet the use high for required precision
Occasion.
Utility model content
The purpose of this utility model is to provide a kind of High-accuracy direct current sensors, to solve to propose in above-mentioned background technique
The problem of.
To achieve the above object, the utility model provides the following technical solutions:
A kind of High-accuracy direct current sensor, including difference amplifier, the differential amplifier inputs and signal it is defeated
Enter end connection, difference amplifier output end is connect by level-one precision U/F converter with isolating coupler, isolating coupler output
End is connect by F/U converter with amplifier OPA, amplifier OPA output signal.
As a further solution of the present invention: the difference amplifier is that level-one independently put by self-powered difference
Big device.
The U/F inverter power supply connecting pin and DC/DC converter one as a further solution of the present invention,
Side connection.
The DC/DC converter other side is set there are two terminals as a further solution of the present invention,
One terminals of DC/DC converter connect 12V positive supply, another terminals ground connection of DC/DC converter, two group capacitors
Parallel connection, one end of shunt capacitor connect 12V positive supply, the other end ground connection of shunt capacitor.
The U/F inverter power supply connecting pin and 12V positive supply connect as a further solution of the present invention,
It connects.
Compared with prior art, the utility model has the beneficial effects that the utility model solves current acquisition conversion sensing
The Zero drift in main amplifier of device improves the precision of direct current transducer, reaches 0.1%, meets the use occasion high for required precision,
It is conveniently used for the high-precision isolation acquisition of electricity and non electrical quantity in industrial control field, is conducive to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of High-accuracy direct current sensor.
Specific embodiment
The technical solution of the patent is explained in further detail With reference to embodiment.
Embodiment one: referring to Fig. 1, a kind of High-accuracy direct current sensor, independent certainly using level-one in the input terminal of signal
The high-performance difference amplifier of charged amplifies processing to the weak electric signal of input, overcomes common mode interference signal；Again through one
Grade precision U/F converter conversion, U/F converter conversion will be converted to high frequency content by handling and obtaining voltage up to predetermined amplitude.
Need to be isolated is high-frequency signal, this just overcomes the null offset occurred during isolation coupling and transmit linear offset and misses
Difference.High frequency content after high frequency transformer is isolated is handled through special chip, is converted into DC quantity output through F/U converter.It is logical
Cross amplifier OPA output.
Electric quantity acquisition for pouring-in rotor one-point grounding protection device.Pouring-in rotor one-point grounding protection device is
The protective device of large-scale generator rotor.
By injecting the power supply of direct current 50V in generator amature cathode and big axis, 60K resistance is concatenated in circuit, works as rotor
After one point earth occurs with big axis, a circuit is just formed, the ground resistance of rotor and big axis is differentiated by the electric current of generation,
Device issues alarm signal after ground resistance is lower than definite value.
Range according to measuring and calculating electric current is the mA of 0.5mA ~ 14.
In the past using hall effect sensor (LEM company LV25-P), pass through the means such as zeroing before factory also only
It is able to satisfy 0.5% required precision, after a period of use, since hall effect sensor will receive earth magnetism, remanent magnetism and temperature
It influences, null offset occurs, measurement accuracy can not meet 0.5% required precision, and ground resistance error is more than mark after device differentiates
The 10% of alignment request；
Hall effect sensor is directly replaced using this module as electric quantity acquisition isolation processing, and it is existing to eliminate null offset
As conversion accuracy reaches 0.1%, and ground resistance error is lower than the 10% of standard requirements after device differentiates, error is significantly good lower than 5%
Cross national standard.
Embodiment two: on the basis of example 1 DC/DC converter side respectively with U/F converter, difference amplifier
Connection, the DC/DC converter other side are set there are two terminals, and a terminals of DC/DC converter connect 12V positive supply, DC/
Another terminals of DC converter are grounded, and two group capacitors are in parallel, and one end of shunt capacitor connects 12V positive supply, in parallel
The other end of capacitor is grounded, and U/F converter is connect with 12V positive supply.
It should be strongly noted that difference amplifier, U/F converter, F/U converter and its connection type are in the application
The innovative point of the application efficiently solves and null offset occurs, and measurement accuracy decline can not meet high for required precision
The problem of use occasion.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of High-accuracy direct current sensor, including difference amplifier, which is characterized in that the differential amplifier inputs with
The input terminal of signal connects, and difference amplifier output end is connect by level-one precision U/F converter with isolating coupler, and coupling is isolated
Clutch output end is connect by F/U converter with amplifier OPA, amplifier OPA output signal.
2. High-accuracy direct current sensor according to claim 1, which is characterized in that the difference amplifier is that level-one is only
Found self-powered difference amplifier.
3. High-accuracy direct current sensor according to claim 1, which is characterized in that the U/F inverter power supply connection
End is connect with DC/DC converter side.
4. High-accuracy direct current sensor according to claim 3, which is characterized in that the DC/DC converter other side
If one terminals of DC/DC converter connect 12V positive supply, another terminals of DC/DC converter there are two terminals
Ground connection, two group capacitors are in parallel, and one end of shunt capacitor connects 12V positive supply, the other end ground connection of shunt capacitor.
5. High-accuracy direct current sensor according to claim 1 or 4, which is characterized in that the U/F inverter power supply connects
End is connect to connect with 12V positive supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821332107.6U CN208795790U (en) | 2018-08-17 | 2018-08-17 | A kind of High-accuracy direct current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821332107.6U CN208795790U (en) | 2018-08-17 | 2018-08-17 | A kind of High-accuracy direct current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208795790U true CN208795790U (en) | 2019-04-26 |
Family
ID=66205928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821332107.6U Active CN208795790U (en) | 2018-08-17 | 2018-08-17 | A kind of High-accuracy direct current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208795790U (en) |
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2018
- 2018-08-17 CN CN201821332107.6U patent/CN208795790U/en active Active
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