CN204228802U - A kind of current intelligent measurement module - Google Patents
A kind of current intelligent measurement module Download PDFInfo
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- CN204228802U CN204228802U CN201420625744.8U CN201420625744U CN204228802U CN 204228802 U CN204228802 U CN 204228802U CN 201420625744 U CN201420625744 U CN 201420625744U CN 204228802 U CN204228802 U CN 204228802U
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Abstract
The utility model belongs to current measurement techniques field, is specifically related to a kind of current intelligent measurement module, and object is to solve the linearly poor of Hall element, and zero-bit is unstable, the problem that accuracy of measurement cannot improve.It is characterized in that: comprise Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit; Wherein, the output terminal of Hall current sensor is connected with the input end of zeroing circuit, the output terminal of zeroing circuit is connected with the input end of amplifier follow circuit, the output terminal of amplifier follow circuit is connected with the input end of filtering circuit, and the output terminal of filtering circuit is connected with the input end of signal processing circuit.This device, by zeroing circuit and signal transacting, effectively overcomes corresponding shortcoming, improves the linearity and the measuring accuracy of measurement module, and can return to zero according to actual conditions.
Description
Technical field
The utility model belongs to current measurement techniques field, is specifically related to a kind of current intelligent measurement module.
Background technology
Aerospace measurement system needs to use many group 28V DC power supply, these power supplys belong to different earthed systems respectively, directly measure the while that the output current of these power supplys being carried out, need to power to metering circuit respectively, and measurement result often belongs to same earthed system with tested power supply.The signal demand accumulating same earthed system carries out isolation conversion.Adopt Hall element circuit to realize indirect inspection, measurement result can not need isolation conversion, but Hall element is linearly poor, and zero-bit is unstable, and accuracy of measurement cannot improve.
Summary of the invention
The purpose of this utility model is to solve the linearly poor of Hall element, and zero-bit is unstable, and the problem that accuracy of measurement cannot improve, provides a kind of current intelligent measurement module.
The utility model is achieved in that
A kind of current intelligent measurement module, comprises Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit; Wherein, the output terminal of Hall current sensor is connected with the input end of zeroing circuit, the output terminal of zeroing circuit is connected with the input end of amplifier follow circuit, the output terminal of amplifier follow circuit is connected with the input end of filtering circuit, and the output terminal of filtering circuit is connected with the input end of signal processing circuit.
The output terminal of signal processing circuit as above is connected with local digital watch or remote computer.
Hall current sensor as above adopts ACS712-20A to realize.
Zeroing circuit as above is by 1 5K potentiometer, and the resistance of 2 10K resistance and 2 200 ohm is formed.
Amplifier follow circuit as above is realized by integrated transporting discharging OP2177 and related peripheral current-limiting resistance and proportion resistor.
Filtering circuit as above adopts RC filtering circuit to realize.
Treatment circuit as above adopts single-chip microcomputer STM32F103RE to realize, and the inside AD of STM32F103RE is 10.
The beneficial effects of the utility model are:
This device adopts Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit, by zeroing circuit and signal processing method, effectively overcome corresponding shortcoming, improve the linearity and the measuring accuracy of measurement module, and can return to zero according to actual conditions.This device is for measuring the electric current of 28 volts of direct supplys, and measurement range is 0-20A, and output voltage is 0-2V; The isolation of this device is determined by Hall current sensor, and the isolation of circuit 1 is 2100V, so this device has the isolation of 2100V; The error of Hall current sensor self is 1.5%, and this device can be better than 1% by the conversion accuracy after software compensation.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of current intelligent measurement module of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of current intelligent measurement module of the present utility model is described:
A kind of current intelligent measurement module, comprising: Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit.Wherein, the output terminal of Hall current sensor is connected with the input end of zeroing circuit, the output terminal of zeroing circuit is connected with the input end of amplifier follow circuit, zeroing circuit receives the current signal from Hall current sensor, this signal is returned to zero, guarantee that the voltage range of this signal is within the import admission scope of amplifier and follow circuit, and send it to amplifier and follow circuit.The output terminal of amplifier follow circuit is connected with the input end of filtering circuit, and the signal from zeroing circuit carries out amplifying by amplifier follow circuit and isolation is followed, and then sends to filtering circuit by processing the signal obtained.The output terminal of filtering circuit is connected with the input end of signal processing circuit, and filtering circuit carries out filtering to the received signal, then sends it to signal processing circuit.The output terminal of signal processing circuit is connected with local digital watch or remote computer, carries out segmented compensation matching to the received signal, then sends it to local digital watch and carries out showing or send to remote computer to carry out remote monitoring.
In the present embodiment, as shown in Figure 1, Hall current sensor adopts ACS712-20A to realize, and electric current flows into from 1,2 pins of ACS712, and flow out from 3,4 pins, the measuring voltage after conversion exports from the pin 7 of ACS712.Zeroing circuit is by 1 5K potentiometer, and the resistance of 2 10K resistance and 2 200 ohm is formed, and can be undertaken by this circuit.Amplifier follow circuit is realized by integrated transporting discharging OP2177 and related peripheral current-limiting resistance and proportion resistor.Filtering circuit adopts RC filtering circuit to realize.Treatment circuit adopts single-chip microcomputer STM32F103RE to realize, and the inside AD of STM32F103RE is 10, can meet the demands completely.Segmented compensation matching adopts existing segmented compensation fitting algorithm to realize.
This device adopts Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit, by zeroing circuit and signal processing method, effectively overcome corresponding shortcoming, improve the linearity and the measuring accuracy of measurement module, and can return to zero according to actual conditions.This device is for measuring the electric current of 28 volts of direct supplys, and measurement range is 0-20A, and output voltage is 0-2V; The isolation of this device is determined by Hall current sensor, and the isolation of circuit 1 is 2100V, so this device has the isolation of 2100V; The error of Hall current sensor self is 1.5%, and this device can be better than 1% by the conversion accuracy after software compensation.
Claims (7)
1. a current intelligent measurement module, is characterized in that: comprise Hall current sensor, zeroing circuit, amplifier follow circuit, filtering circuit and signal processing circuit; Wherein, the output terminal of Hall current sensor is connected with the input end of zeroing circuit, the output terminal of zeroing circuit is connected with the input end of amplifier follow circuit, the output terminal of amplifier follow circuit is connected with the input end of filtering circuit, and the output terminal of filtering circuit is connected with the input end of signal processing circuit.
2. a kind of current intelligent measurement module according to claim 1, is characterized in that: the output terminal of described signal processing circuit is connected with local digital watch or remote computer.
3. a kind of current intelligent measurement module according to claim 1 and 2, is characterized in that: described Hall current sensor adopts ACS712-20A to realize.
4. a kind of current intelligent measurement module according to claim 1 and 2, is characterized in that: described zeroing circuit is by 1 5K potentiometer, and the resistance of 2 10K resistance and 2 200 ohm is formed.
5. a kind of current intelligent measurement module according to claim 1 and 2, is characterized in that: described amplifier follow circuit is realized by integrated transporting discharging OP2177 and related peripheral current-limiting resistance and proportion resistor.
6. a kind of current intelligent measurement module according to claim 1 and 2, is characterized in that: described filtering circuit adopts RC filtering circuit to realize.
7. a kind of current intelligent measurement module according to claim 1 and 2, is characterized in that: described treatment circuit adopts single-chip microcomputer STM32F103RE to realize, and the inside AD of STM32F103RE is 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420625744.8U CN204228802U (en) | 2014-10-27 | 2014-10-27 | A kind of current intelligent measurement module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420625744.8U CN204228802U (en) | 2014-10-27 | 2014-10-27 | A kind of current intelligent measurement module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204228802U true CN204228802U (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420625744.8U Active CN204228802U (en) | 2014-10-27 | 2014-10-27 | A kind of current intelligent measurement module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204228802U (en) |
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2014
- 2014-10-27 CN CN201420625744.8U patent/CN204228802U/en active Active
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