CN208488495U - A kind of voltage and current frequency measurement sampling apparatus - Google Patents
A kind of voltage and current frequency measurement sampling apparatus Download PDFInfo
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- CN208488495U CN208488495U CN201820895556.5U CN201820895556U CN208488495U CN 208488495 U CN208488495 U CN 208488495U CN 201820895556 U CN201820895556 U CN 201820895556U CN 208488495 U CN208488495 U CN 208488495U
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Abstract
The utility model discloses a kind of voltage and current frequency measurement sampling apparatus, the utility model includes mainboard processor, FPGA module, ADC analog-to-digital conversion module, first order ranging amplifier, second level instrument amplifier, filter module, magnification ratio control module, current measurement module and voltage measurement module.The utility model passes through first order ranging amplifier, second level instrument amplifier, filter module and magnification ratio control module, to be able to achieve the switching of the amplification coefficient for different ranges, meet the voltage and current measurement of wide scope range, and dynamically track characteristic more carefully can be reached by using FPGA module, effectively improve measurement accuracy.The utility model can be widely applied in field of power detection.
Description
Technical field
The utility model relates to electronic technology field more particularly to a kind of voltage and current frequency measurement sampling apparatuses.
Background technique
Conventional power system voltage or current acquisition board measurement range is not wide in range enough, and the span usually measured is by most
Small-range position 1V to 1000V.Current sample is needed using current transformer simultaneously, and voltage sample is needed using voltage transformer,
And conventional transformer precision is usually 2/1000ths, it is difficult to realize 5/10000ths measurement request.And in frequency measurement side
Face carries out fundamental frequency latch using phaselocked loop, and the measurement accuracy of realization is difficult to meet the measurement request of 0.001Hz.Due to adopting
With phaselocked loop, the dynamic characteristic of response time and measurement frequency is bad.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of the utility model is to provide a kind of voltage electricity that can improve sampling precision
Flow frequency measurement sampling apparatus.
Technical solution adopted in the utility model is:
A kind of voltage and current frequency measurement sampling apparatus, including mainboard processor, FPGA module, ADC analog-to-digital conversion module, first
Grade ranging amplifier, second level instrument amplifier, filter module, magnification ratio control module, current measurement module and voltage are surveyed
Module is measured, the FPGA module is connected with mainboard processor and ADC analog-to-digital conversion module respectively, the current measurement module
Output end is connect with the first input end of first order ranging amplifier, the output end and first order range of the voltage measurement module
Second input terminal of amplifier connects, and the first of the output end of the first order ranging amplifier and second level instrument amplifier is defeated
Enter end connection, the first output end of the FPGA module passes through magnification ratio control module and second level instrument amplifier
The connection of second input terminal, the first output end of the second level instrument amplifier are connect with the input terminal of ADC analog-to-digital conversion module,
The second output terminal of the second level instrument amplifier is connect by filter module with the input terminal of FPGA module, described
The second output terminal of FPGA module and the input terminal of current measurement module connect.
As a further improvement of the utility model, the filter module include first order second-order low-pass filter amplifier,
Second level second-order low-pass filter amplifier, eight rank digitally tunable filters and zero-crossing comparator, the second level instrument amplifier
Second output terminal to pass sequentially through first order second-order low-pass filter amplifier, eight rank digitally tunable filters, second level second order low
Bandpass filter amplifier and zero-crossing comparator are connect with the input terminal of FPGA module in turn.
The magnification ratio control module includes the first IO decoder, simulation as a further improvement of the utility model,
Switch and resistor network, the first output end of the FPGA module pass sequentially through the first IO decoder, analog switch and resistance net
Network is connect with the second input terminal of second level instrument amplifier in turn.
The current measurement module is cut including the 2nd IO decoder, relay as a further improvement of the utility model,
Change array and current measurement resistance unit, the input terminal of output end and relay the switching array of the current measurement resistance unit
The output end of connection, the relay switching array is connect with the input terminal of first order ranging amplifier, the FPGA module
Second output terminal is connect by the 2nd IO decoder with the control signal that relay switches array.
The current measurement resistance unit uses a variety of different current measurements as a further improvement of the utility model,
Resistance is constituted.
The voltage measurement module is constituted using high-impedance resistors network as a further improvement of the utility model,.
The beneficial effects of the utility model are:
A kind of voltage and current frequency measurement sampling apparatus of the utility model is amplified by first order ranging amplifier, second level instrument
Device, filter module and magnification ratio control module meet wide model to be able to achieve the switching of the amplification coefficient for different ranges
The voltage and current measurement of range is enclosed, and preferable dynamically track characteristic can be reached by using FPGA module, is effectively improved
Measurement accuracy.
Detailed description of the invention
Fig. 1 is a kind of functional-block diagram of voltage and current frequency measurement sampling apparatus of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing:
With reference to Fig. 1, a kind of voltage and current frequency measurement sampling apparatus of the utility model, including mainboard processor, FPGA module,
ADC analog-to-digital conversion module, first order ranging amplifier, second level instrument amplifier, filter module, magnification ratio control module,
Current measurement module and voltage measurement module, the FPGA module are connected with mainboard processor and ADC analog-to-digital conversion module respectively
It connects, the output end of the current measurement module is connect with the first input end of first order ranging amplifier, the voltage measurement mould
The output end of block is connect with the second input terminal of first order ranging amplifier, the output end of the first order ranging amplifier and
The first input end of second level instrument amplifier connects, the first output end of the FPGA module by magnification ratio control module into
And it is connect with the second input terminal of second level instrument amplifier, the first output end and ADC mould of the second level instrument amplifier
The input terminal connection of number conversion module, the second output terminal of the second level instrument amplifier pass through filter module and FPGA
The input terminal of module connects, and the second output terminal of the FPGA module and the input terminal of current measurement module connect.
It is further used as preferred embodiment, the filter module includes first order second-order low-pass filter amplifier,
Second level second-order low-pass filter amplifier, eight rank digitally tunable filters and zero-crossing comparator, the second level instrument amplifier
Second output terminal passes sequentially through first order second-order low-pass filter amplifier, eight rank digitally tunable filters, second level step low-pass
Filter amplifier and zero-crossing comparator are connect with the input terminal of FPGA module in turn.
It is further used as preferred embodiment, the magnification ratio control module includes the first IO decoder, simulates and open
It closes and resistor network, the first output end of the FPGA module passes sequentially through the first IO decoder, analog switch and resistor network
And then it is connect with the second input terminal of second level instrument amplifier.
It is further used as preferred embodiment, the current measurement module includes the 2nd IO decoder, relay switching
The input terminal of array and current measurement resistance unit, output end and relay the switching array of the current measurement resistance unit connects
It connecing, the output end of relay switching array is connect with the input terminal of first order ranging amplifier, and the of the FPGA module
Two output ends are connect by the 2nd IO decoder with the control signal that relay switches array.
It is further used as preferred embodiment, the current measurement resistance unit is using a variety of different current measurement electricity
Resistance is constituted.
It is further used as preferred embodiment, the voltage measurement module is constituted using high-impedance resistors network.This reality
With in new embodiment, the current measurement resistance unit is using 5A-30A Super-Current Measurement resistance, 2A-5A Super-Current Measurement electricity
Resistance, 500mA-2A Super-Current Measurement resistance, 10mA-500mA Super-Current Measurement resistance, 1mA-10mA Super-Current Measurement resistance and
0.1mA-1mA Super-Current Measurement resistance constitute, so as to realize 0.01mA-30A current measuring range wide scope electric current
Voltage measurement, measuring accuracy is up to 5/10000ths, voltage measurement range 0.1mV-1000V, and measuring accuracy is up to 5/10000ths.
The utility model can be by voltage measurement module and current measurement module to the every electricity of A, B, C, N of electric system
Pressure, electric current carry out analog signal sampling.The utility model based on FPGA module realize to the voltage and current sampling channel of multichannel into
Row parallel acquisition, it is ensured that the phase offset between it is 0.And the multidigit in voltage and current circuit can be controlled by FPGA module
Analog switch realizes that the amplification coefficient for different ranges switches, and meets the voltage and current measurement of wide scope range.FPGA module
Data interaction, the data such as transmitting warning information, control command and status information are carried out with mainboard processor.It adopts frequency measurement part
With the mode of FPGA measurement pulsewidth, extraordinary dynamically track characteristic can be reached, measuring accuracy reaches 0.001Hz.
It is to be illustrated to the preferable implementation of the utility model, but the utility model creation is not limited to institute above
State embodiment, those skilled in the art can also make various etc. without departing from the spirit of the present invention
With deformation or replacement, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (6)
1. a kind of voltage and current frequency measurement sampling apparatus, it is characterised in that: including mainboard processor, FPGA module, ADC analog-to-digital conversion
Module, first order ranging amplifier, second level instrument amplifier, filter module, magnification ratio control module, current measurement module
And voltage measurement module, the FPGA module are connected with mainboard processor and ADC analog-to-digital conversion module respectively, the electric current is surveyed
The output end of amount module is connect with the first input end of first order ranging amplifier, the output end of the voltage measurement module and the
Second input terminal of level-one ranging amplifier connects, the output end and second level instrument amplifier of the first order ranging amplifier
First input end connection, the first output end of the FPGA module passes through magnification ratio control module and second level instrument
Second input terminal of amplifier connects, and the first output end of the second level instrument amplifier is defeated with ADC analog-to-digital conversion module
Enter end connection, the second output terminal of the second level instrument amplifier is connected by filter module and the input terminal of FPGA module
It connects, the second output terminal of the FPGA module and the input terminal of current measurement module connect.
2. a kind of voltage and current frequency measurement sampling apparatus according to claim 1, it is characterised in that: the filter module includes
First order second-order low-pass filter amplifier, second level second-order low-pass filter amplifier, eight rank digitally tunable filters and zero passage ratio
Compared with device, the second output terminal of the second level instrument amplifier passes sequentially through first order second-order low-pass filter amplifier, eight orders
Word tunable filter, second level second-order low-pass filter amplifier and zero-crossing comparator are connect with the input terminal of FPGA module in turn.
3. a kind of voltage and current frequency measurement sampling apparatus according to claim 1, it is characterised in that: the magnification ratio control
Module includes the first IO decoder, analog switch and resistor network, and the first output end of the FPGA module passes sequentially through first
IO decoder, analog switch and resistor network are connect with the second input terminal of second level instrument amplifier in turn.
4. a kind of voltage and current frequency measurement sampling apparatus according to claim 1, it is characterised in that: the current measurement module
Including the 2nd IO decoder, relay switching array and current measurement resistance unit, the output of the current measurement resistance unit
It holds and is connect with the input terminal of relay switching array, the output end and first order ranging amplifier of the relay switching array
Input terminal connection, the second output terminal of the FPGA module switch the control of array by the 2nd IO decoder with relay
Input terminal connection.
5. a kind of voltage and current frequency measurement sampling apparatus according to claim 4, it is characterised in that: the current measurement resistance
Unit is constituted using a variety of different current measurement resistances.
6. a kind of voltage and current frequency measurement sampling apparatus according to claim 1, it is characterised in that: the voltage measurement module
It is constituted using high-impedance resistors network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820895556.5U CN208488495U (en) | 2018-06-08 | 2018-06-08 | A kind of voltage and current frequency measurement sampling apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820895556.5U CN208488495U (en) | 2018-06-08 | 2018-06-08 | A kind of voltage and current frequency measurement sampling apparatus |
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| Publication Number | Publication Date |
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| CN208488495U true CN208488495U (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820895556.5U Active CN208488495U (en) | 2018-06-08 | 2018-06-08 | A kind of voltage and current frequency measurement sampling apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514883A (en) * | 2019-09-18 | 2019-11-29 | 中国电子科技集团公司第五十八研究所 | A kind of high pressure wide input range current sample operational amplifier circuit |
-
2018
- 2018-06-08 CN CN201820895556.5U patent/CN208488495U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514883A (en) * | 2019-09-18 | 2019-11-29 | 中国电子科技集团公司第五十八研究所 | A kind of high pressure wide input range current sample operational amplifier circuit |
| CN110514883B (en) * | 2019-09-18 | 2021-04-13 | 中国电子科技集团公司第五十八研究所 | High-voltage wide-input-range current sampling operational amplifier circuit |
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