CN207096325U - A kind of A/D convertor circuit of intelligent electric meter - Google Patents
A kind of A/D convertor circuit of intelligent electric meter Download PDFInfo
- Publication number
- CN207096325U CN207096325U CN201720741541.9U CN201720741541U CN207096325U CN 207096325 U CN207096325 U CN 207096325U CN 201720741541 U CN201720741541 U CN 201720741541U CN 207096325 U CN207096325 U CN 207096325U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- amplifier
- follower
- signal
- Prior art date
- 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 - Fee Related
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The utility model belongs to D/A converting circuit technical field,A kind of more particularly to A/D convertor circuit of intelligent electric meter,One end of the adjustable rheostat R6 is connected to resistance R5 one end,The sampling holder U4 outputs are connected to resistance R7 one end,The other end of the resistance R7 is connected to pull-up resistor R8 and digital analog converter U5 serial input terminal,The parallel output terminal of the digital analog converter U5 is connected to controller through parallel bus,The utility model solves prior art and D/A converting circuit be present and not only needs conversion chip,And need such as sampling hold circuit,The problem of signal conditioning circuit such as reference circuit and analog switching circuit,With not only signal acquisition is optimized,And it ensure that the integrality and continuity of signal input,It ensure that the intensity of signal input driving,Ensure the accuracy of signal measurement,Ensure the successional advantageous effects of signal sampling.
Description
Technical field
The utility model belongs to D/A converting circuit technical field, more particularly to a kind of A/D convertor circuit of intelligent electric meter.
Background technology
At present, digital-to-analogue conversion is exactly that discrete digital quantity is converted to the analog quantity of connection change, realizes the electricity of the function
Road or device are referred to as D/A converting circuit, commonly referred to as D/A converter or DAC (Digital Analog Converter), existing
Not only need conversion chip with the presence of technology D/A converting circuit, and need such as sampling hold circuit, reference circuit and
The problem of signal conditioning circuits such as analog switching circuit.
Utility model content
The utility model provides a kind of A/D convertor circuit of intelligent electric meter, existing to solve to propose in above-mentioned background technology
Technology, which has D/A converting circuit, not only needs conversion chip, and needs such as sampling hold circuit, reference circuit and mould
The problem of intending the signal conditioning circuits such as on-off circuit.
The technical problem that the utility model solves is realized using following technical scheme：A kind of AD conversion of intelligent electric meter
Circuit, including current detection circuit U1, the current detection circuit U1 outputs are connected to follower U2 negative input end, it is described with
With device U2 positive input terminal feedback link biased electrical is connected in the output end for being connected to follower U2, the follower U2 outputs
R1 one end is hindered, the other end of the biasing resistor R1 is connected to amplifier U3 positive input terminal, is set forth in the negative of amplifier U3
Input is connected to resistance R2 one end, the other end ground connection of the resistance R2, and the amplifier U3 outputs are connected to feedback electricity
R3 one end is hindered, the other end of the feedback resistance R3 is connected to amplifier U3 input, the amplifier U3 outputs connection
In resistance R4 one end, the other end of the resistance R4 is connected to sampling holder U4, the control terminal of the sampling holder U4
Adjustable rheostat R6 adjustable end is connected to, one end of the adjustable rheostat R6 is connected to resistance R5 one end, the sampling
Retainer U4 exports the one end for being connected to resistance R7, and the other end of the resistance R7 is connected to pull-up resistor R8 and digital analog converter
U5 serial input terminal, the parallel output terminal of the digital analog converter U5 are connected to controller through parallel bus.
Further, the other end connection digital power of the adjustable rheostat R6, the other end ground connection of the resistance R5.
Further, the power end parallel filtering electric capacity C1 of the sampling holder U4.
Advantageous effects：
1st, this patent is connected to follower U2 negative input end, the follower using current detection circuit U1 outputs
U2 positive input terminal feedback link is connected to biasing resistor R1 in the output end for being connected to follower U2, the follower U2 outputs
One end, the other end of the biasing resistor R1 is connected to amplifier U3 positive input terminal, is set forth in amplifier U3 negative input
End is connected to resistance R2 one end, the other end ground connection of the resistance R2, and the amplifier U3 outputs are connected to feedback resistance R3
One end, the other end of the feedback resistance R3 is connected to amplifier U3 input, and the amplifier U3 outputs are connected to electricity
R4 one end is hindered, the other end of the resistance R4 is connected to sampling holder U4, the sampling holder U4 control terminal connection
In adjustable rheostat R6 adjustable end, one end of the adjustable rheostat R6 is connected to resistance R5 one end, and the sampling is kept
Device U4 exports the one end for being connected to resistance R7, and the other end of the resistance R7 is connected to pull-up resistor R8's and digital analog converter U5
Serial input terminal, the parallel output terminal of the digital analog converter U5 is connected to controller through parallel bus, because a/d converter exists
In practical application, the simulation input mode of generally use Approach by inchmeal or parallel relatively A/D converter, due to the signal of the system
Input is exchange way, i.e., using bipolarity input, therefore appropriate adjustment should be done to input circuit, when the requirement of system
When the full scale that need to be inputted is 5V--5V, the resistance for being computed resistance is 51K, due to system front end have follower, amplifier,
The elements such as sampling holder, not only signal acquisition is optimized, and ensure that the integrality and continuity of signal input.
2nd, this patent is connected to follower U2 negative input end using current detection circuit U1 outputs, described to follow
Device U2 positive input terminal feedback link is connected to biasing resistor in the output end for being connected to follower U2, the follower U2 outputs
R1 one end, due to using follower U2, due to the high input impedance and low output impedance of follower, it ensure that signal input is driven
Dynamic intensity.
3rd, this patent is connected to amplifier U3 positive input terminal using the other end of the biasing resistor R1, is set forth in amplification
Device U3 negative input end is connected to resistance R2 one end, the other end ground connection of the resistance R2, the amplifier U3 outputs connection
In feedback resistance R3 one end, due to using signal amplifier, due to range and mismatch of the input generally with AD of signal, such as
If fruit direct measurement, the decline of the resolution ratio of signal can be caused, in order to improve the resolution ratio of signal, should signal input with
Range matching is carried out between output, to ensure the accuracy of signal measurement.
4th, this patent is connected to sampling holder U4, the control of the sampling holder U4 using the other end of the resistance R4
End processed is connected to adjustable rheostat R6 adjustable end, and one end of the adjustable rheostat R6 is connected to resistance R5 one end, described
Sampling holder U4 exports the one end for being connected to resistance R7, because sampling holder U4 has the function that signal buffering, is inputting
During analog-to-digital conversion, signal holding is carried out, on the basis of bandwidth adaptation, can guarantee that the continuity of signal sampling.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the A/D convertor circuit of intelligent electric meter of the utility model.
Embodiment
The utility model is described further below in conjunction with accompanying drawing：
In figure：U1- current detection circuits, U2- followers, R1- biasing resistors, U3- amplifiers, R2- resistance, R3- feedbacks
Resistance, R4- resistance, U4- sampling holders, R6- is adjustable rheostat, R5- resistance, R7- resistance, R8- pull-up resistors, U5- digital-to-analogues
Converter, R5- resistance, C1- filter capacitors.
Embodiment：
The present embodiment：As shown in figure 1, a kind of A/D convertor circuit of intelligent electric meter, including current detection circuit U1, the electricity
Current detection circuit U1 exports the negative input end for being connected to follower U2, and the positive input terminal feedback link of the follower U2 is in connection
In follower U2 output end, the follower U2 outputs are connected to biasing resistor R1 one end, and the biasing resistor R1's is another
One end is connected to amplifier U3 positive input terminal, and the negative input end for being set forth in amplifier U3 is connected to resistance R2 one end, described
Resistance R2 other end ground connection, the amplifier U3 outputs are connected to feedback resistance R3 one end, and the feedback resistance R3's is another
One end is connected to amplifier U3 input, and the amplifier U3 outputs are connected to resistance R4 one end, and the resistance R4's is another
One end is connected to sampling holder U4, and the control terminal of the sampling holder U4 is connected to adjustable rheostat R6 adjustable end, institute
The one end for stating adjustable rheostat R6 is connected to resistance R5 one end, and the sampling holder U4 outputs are connected to the one of resistance R7
End, the other end of the resistance R7 are connected to pull-up resistor R8 and digital analog converter U5 serial input terminal, the digital-to-analogue conversion
Device U5 parallel output terminal is connected to controller through parallel bus.
The other end connection digital power of the adjustable rheostat R6, the other end ground connection of the resistance R5.
The power end parallel filtering electric capacity C1 of the sampling holder U4.
Operation principle：
This patent is connected to follower U2 negative input end, the follower U2 by current detection circuit U1 outputs
Positive input terminal feedback link in the output end for being connected to follower U2, the follower U2 outputs are connected to biasing resistor R1's
One end, the other end of the biasing resistor R1 are connected to amplifier U3 positive input terminal, are set forth in amplifier U3 negative input end
Resistance R2 one end, the other end ground connection of the resistance R2 are connected to, the amplifier U3 outputs are connected to feedback resistance R3's
One end, the other end of the feedback resistance R3 are connected to amplifier U3 input, and the amplifier U3 outputs are connected to resistance
R4 one end, the other end of the resistance R4 are connected to sampling holder U4, and the control terminal of the sampling holder U4 is connected to
Adjustable rheostat R6 adjustable end, one end of the adjustable rheostat R6 are connected to resistance R5 one end, the sampling holder
U4 exports the one end for being connected to resistance R7, and the other end of the resistance R7 is connected to pull-up resistor R8 and digital analog converter U5 string
Row input, the parallel output terminal of the digital analog converter U5 is connected to controller through parallel bus, because a/d converter is in reality
In the application of border, the simulation input mode of generally use Approach by inchmeal or parallel relatively A/D converter, because the signal of the system is defeated
It is exchange way to enter, i.e., using bipolarity input, therefore appropriate adjustment should be done to input circuit, when the requirement of system needs
When the full scale of input is 5V--5V, the resistance for being computed resistance is 51K, because system front end has follower, amplifier, adopts
The elements such as sample retainer, the utility model solve prior art and D/A converting circuit be present and not only need conversion chip, and
The problem of needing the signal conditioning circuits such as sampling hold circuit, reference circuit and analog switching circuit, it is not only right to have
Signal acquisition is optimized, and ensure that signal input integrality and continuity, ensure that signal input driving it is strong
Degree, the accuracy for ensureing signal measurement, the successional advantageous effects for ensureing signal sampling.
Using the technical solution of the utility model, or those skilled in the art is in the inspiration of technical solutions of the utility model
Under, similar technical scheme is designed, and reach above-mentioned technique effect, it is to fall into the scope of protection of the utility model.
Claims (3)
- A kind of 1. A/D convertor circuit of intelligent electric meter, it is characterised in that including current detection circuit U1, the current detection circuit U1, which is exported, is connected to follower U2 negative input end, and the positive input terminal feedback link of the follower U2 is in being connected to follower U2 Output end, follower U2 output is connected to biasing resistor R1 one end, and the other end of the biasing resistor R1 is connected to Amplifier U3 positive input terminal, the negative input end for being set forth in amplifier U3 are connected to resistance R2 one end, and the resistance R2's is another One end is grounded, and the amplifier U3 outputs are connected to feedback resistance R3 one end, and the other end of the feedback resistance R3 is connected to Amplifier U3 input, the amplifier U3 outputs are connected to resistance R4 one end, and the other end of the resistance R4 is connected to Sampling holder U4, the control terminal of the sampling holder U4 are connected to adjustable rheostat R6 adjustable end, the adjustable variable resistance Device R6 one end is connected to resistance R5 one end, and the sampling holder U4 outputs are connected to resistance R7 one end, the resistance The R7 other end is connected to pull-up resistor R8 and digital analog converter U5 serial input terminal, and the digital analog converter U5's is parallel defeated Go out end and be connected to controller through parallel bus.
- A kind of 2. A/D convertor circuit of intelligent electric meter according to claim 1, it is characterised in that the adjustable rheostat R6 The other end connection digital power, the resistance R5 the other end ground connection.
- A kind of 3. A/D convertor circuit of intelligent electric meter according to claim 1, it is characterised in that the sampling holder U4 Power end parallel filtering electric capacity C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720741541.9U CN207096325U (en) | 2017-06-23 | 2017-06-23 | A kind of A/D convertor circuit of intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720741541.9U CN207096325U (en) | 2017-06-23 | 2017-06-23 | A kind of A/D convertor circuit of intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096325U true CN207096325U (en) | 2018-03-13 |
Family
ID=61554025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720741541.9U Expired - Fee Related CN207096325U (en) | 2017-06-23 | 2017-06-23 | A kind of A/D convertor circuit of intelligent electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096325U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683115A (en) * | 2020-12-16 | 2021-04-20 | 陕西航天时代导航设备有限公司 | Torpedo steering engine driving system based on CPLD control |
-
2017
- 2017-06-23 CN CN201720741541.9U patent/CN207096325U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112683115A (en) * | 2020-12-16 | 2021-04-20 | 陕西航天时代导航设备有限公司 | Torpedo steering engine driving system based on CPLD control |
| CN112683115B (en) * | 2020-12-16 | 2024-01-30 | 陕西航天时代导航设备有限公司 | Torpedo steering engine driving system based on CPLD control |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103634008B (en) | Multi-channel signal collecting device and collecting method | |
| CN204836096U (en) | Piezoelectric acceleration sensor's charge amplifier | |
| CN204155439U (en) | A kind of multi-channel high-accuracy data acquisition unit | |
| CN209342798U (en) | A kind of voltage sampling apparatus | |
| CN208506629U (en) | A kind of power supply circuit based on far-end feedback | |
| CN103630736A (en) | MSP430 single chip microcomputer based on-line insulator leakage current monitoring device | |
| CN207096325U (en) | A kind of A/D convertor circuit of intelligent electric meter | |
| CN211697923U (en) | High-precision constant-resistance analog load adjusted through program-controlled digital potentiometer | |
| CN201974489U (en) | Lightning arrester detector | |
| CN104811201B (en) | The single channel synchronous acquisition device and method of multiple signals bipolar square wave modulation | |
| CN103096567B (en) | Multi-channel current control circuit and control method | |
| CN203275613U (en) | Data acquisition port for DC power hardware | |
| CN206020966U (en) | A kind of dynamic adjustment sampling, the device of control accuracy | |
| CN103076480A (en) | Tiny signal collecting card | |
| CN203968060U (en) | A kind of sample circuit for photovoltaic combiner box | |
| CN204462247U (en) | A kind of current collection circuit | |
| CN204334545U (en) | High pressure analog to digital conversion circuit in battery management system | |
| CN207924003U (en) | Wisdom safety utilization of electric power monitoring detector voltage display device | |
| CN204346584U (en) | Light change-over switch input wide region optical power detection apparatus | |
| CN106342289B (en) | Avalanche photodiodes bias voltage control circuit | |
| CN103869863B (en) | Sensor conditioning circuit | |
| CN208939927U (en) | Signal sample circuit | |
| CN208079468U (en) | The controlled constant-current source circuit of Linear Control | |
| CN207991999U (en) | High precision two line system industrial dust detection device | |
| CN206505122U (en) | A kind of isolation voltage sample circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 Termination date: 20180623 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |