CN109541442A - The adjustable sample circuit of precision and measuring device - Google Patents
The adjustable sample circuit of precision and measuring device Download PDFInfo
- Publication number
- CN109541442A CN109541442A CN201910001523.0A CN201910001523A CN109541442A CN 109541442 A CN109541442 A CN 109541442A CN 201910001523 A CN201910001523 A CN 201910001523A CN 109541442 A CN109541442 A CN 109541442A
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- China
- Prior art keywords
- programmable
- mcu
- precision
- amplifier
- sample circuit
- Prior art date
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- Withdrawn
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- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
Abstract
The invention discloses a kind of adjustable sample circuits of precision comprising programmable amplifier, programmable attenuator and MCU, the programmable amplifier, for amplifying electric signal to be sampled；The programmable attenuator, for electric signal to be sampled to be decayed；The MCU, for being selected the programmable amplifier and programmable attenuator and being controlled the amplification factor of programmable amplifier or the attenuation multiple of the programmable attenuator.Sample circuit of the invention has the advantages that precision is adjustable and sample range is wide.The invention also discloses a kind of measuring devices using above-mentioned sample circuit.
Description
Technical field
The present invention relates to circuit field more particularly to a kind of adjustable sample circuit of precision and using the sample circuit
Measuring device.
Background technique
In industrial circle, it is often necessary to acquisition DC voltage, the DC quantities such as DC current, so as to control object into
Row control.In existing technology, general DC quantity is directly accessed sample circuit and measures.For more sampling environment complexity
, need the D. C. value that measures larger or smaller, in the case that the sampling precision of sample circuit cannot be adjusted, cause to answer
It is too small with range.
Summary of the invention
The purpose of the present invention is in view of the above-mentioned drawbacks of the prior art, provide a kind of adjustable sample circuit of precision and
Measuring device, to solve the small technical problem of sample circuit application range in the prior art.
In the embodiment of the present invention, a kind of adjustable sample circuit of precision is provided comprising programmable amplifier may be programmed
Attenuator and MCU,
The programmable amplifier, for amplifying electric signal to be sampled；
The programmable attenuator, for electric signal to be sampled to be decayed；
The MCU, for being selected the programmable amplifier and programmable attenuator and controlling programmable amplifier
The attenuation multiple of amplification factor or the programmable attenuator.
In the embodiment of the present invention, the adjustable sample circuit of the precision further include respectively with the programmable amplifier and
The resistor voltage divider circuit that the programmable attenuator is connected, the resistor voltage divider circuit be used for by voltage signal to be sampled into
Voltage signal after partial pressure, is then passed to the programmable amplifier and the programmable attenuator, the electricity by row partial pressure
Resistance bleeder circuit is also used to circuit current signal to be sampled being converted to voltage signal, then passes the voltage signal after conversion
Pass the programmable amplifier and the programmable attenuator.
In the embodiment of the present invention, the resistor voltage divider circuit includes resistance R1 and resistance R2, and one end reception of resistance R1 is adopted
Sample signal, one end of another terminating resistor R2, the other end ground connection of resistance R2, the connecting pin of resistance R1 and resistance R2 respectively with institute
Programmable amplifier is stated to be connected with the programmable attenuator.
In the embodiment of the present invention, the adjustable sample circuit of the precision further include respectively with the programmable amplifier,
The analog switch that the programmable attenuator is connected with the MCU, the analog switch are used for disconnected according to the instruction of the MCU
It opens and is connected, and select the voltage signal for transmitting the programmable amplifier or the programmable attenuator to the MCU.
In the embodiment of the present invention, the adjustable sample circuit of the precision further includes being connected to the analog switch and described
Voltage follower between MCU, the voltage signal that the voltage follower is used to pass over the analog switch is completely
Pass to the MCU.
In the embodiment of the present invention, the MCU detects the voltage signal received, if what is currently enabled is described
Programmable amplifier turns down the times magnification of the programmable amplifier when the voltage signal received is more than the range of setting
Number.
In the embodiment of the present invention, when the amplification factor of the programmable amplifier is transferred to minimum, if the MCU is received
To voltage signal be still more than setting range, then close the programmable amplifier, enable the programmable attenuator.
In the embodiment of the present invention, the MCU detects the voltage signal received, if what is currently enabled is described
Programmable attenuator turns down the decaying of the droop amplifier when the voltage signal received is always less than the numerical value of setting
Multiple.
In the embodiment of the present invention, when the attenuation multiple of the programmable attenuator is transferred to minimum, if the MCU is received
To voltage signal be also less than the numerical value of setting, then close the programmable attenuator, enable the programmable amplifier.
In the embodiment of the present invention, a kind of measuring device is additionally provided, uses the adjustable sample circuit of above-mentioned precision.
Compared with prior art, the adjustable sample circuit of precision of the invention uses programmable amplifier and may be programmed
Attenuator, so as to according to by the size of sampled signal come certain times that select to zoom in or out to measured signal
Number, can have broader sample range；In addition, use analog switch, by the analog sampling signal and MCU of input carry out every
From to prevent external sampled signal interference and influence the sampling accuracy of sample circuit；The analog switch can be controlled
The disconnection and conducting of sampled signal input processed, improve the safety of sample circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the sample circuit of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the resistor voltage divider circuit in Fig. 1.
Fig. 3 is the structural schematic diagram using programmable amplifier of the sample circuit of the embodiment of the present invention.
Fig. 4 is the structural schematic diagram using programmable attenuator of the sample circuit of the embodiment of the present invention.
Specific embodiment
As shown in Figure 1, providing a kind of adjustable sample circuit of precision comprising electric resistance partial pressure in the embodiment of the present invention
Circuit 1, programmable amplifier 2, programmable attenuator 3, analog switch 4, voltage follower 5 and MCU6.It carries out separately below detailed
It describes in detail bright.
As shown in Fig. 2, the resistor voltage divider circuit 1 uses a kind of typical electric resistance partial pressure electricity in the embodiment of the present invention
Road comprising receive sampled signal, one end of another terminating resistor R2, resistance R2 in one end of resistance R1 and resistance R2, resistance R1
The other end ground connection, the connecting pin of resistance R1 and resistance R2 respectively with the programmable amplifier and the programmable attenuator phase
Connection.When signal to be sampled is voltage signal, the resistor voltage divider circuit 1 is for being divided voltage signal to be sampled
Voltage signal after partial pressure, is then passed to the programmable amplifier 2 and the programmable attenuator 3 by pressure.When to be sampled
When signal is current signal, the resistor voltage divider circuit 1 is also used to circuit current signal to be sampled being converted to voltage signal,
Then the voltage signal after conversion is passed into the programmable amplifier 2 and the programmable attenuator 3.
The programmable amplifier 2, for amplifying electric signal to be sampled.It should be noted that described compile
Journey amplifier 2 is a kind of circuit that amplification factor can be adjusted by programming, and can receive the control signal of the MCU6, from
And adjust amplification factor.
The programmable attenuator 3, for electric signal to be sampled to be decayed.It should be noted that described compile
Journey attenuator 3 is a kind of circuit that attenuation multiple can be adjusted by programming, and can receive the control signal of the MCU6, from
And adjust attenuation multiple.
The analog switch 4 is connected with the programmable amplifier 2, the programmable attenuator 3 and the MCU6 respectively
It connects, is used to be disconnected and be connected according to the instruction of the MCU6, and select to transmit the programmable amplifier 2 or described compile
The voltage signal of journey attenuator 3 gives the MCU.
The voltage follower 5 is connected between the analog switch 4 and the MCU6, is used for the analog switch
4 voltage signals passed over completely pass to the MCU.
The MCU6 is connected with the programmable amplifier 2, the programmable attenuator 3 respectively, is used for described
Programmable amplifier 2 and programmable attenuator 3 are selected and are controlled the amplification factor of programmable amplifier 2 or described compiled
The attenuation multiple of journey attenuator 3.It should be noted that the MCU6 selects to compile described in unlatching by the analog switch 4
Journey amplifier 2 and programmable attenuator 3 carry out signal acquisition.Further, the MCU6 reads it and selects described may be programmed
The voltage signal that amplifier 2 or programmable attenuator 3 pass over, and the voltage signal is analyzed, thus to can
Programming amplifier and programmable attenuator are selected and are selected the multiple for amplifying or decaying.
Specifically, the working principle of above-mentioned sample circuit is as follows:
As shown in figure 3, if what is currently enabled is the programmable amplifier 2, the MCU6 to the voltage signal received into
Row detection turns down the amplification factor of the programmable amplifier 2 when the voltage signal received is more than the range of setting.When
When the amplification factor of the programmable amplifier 2 is transferred to minimum, if the voltage signal that the MCU6 is received still is more than to set
Fixed range then closes the programmable amplifier 2 by the analog switch 4, enables the programmable attenuator 3.
As shown in figure 4, if what is currently enabled is the programmable attenuator 3, when the voltage letter that the MCU6 is received
When number being always less than the numerical value of setting, the attenuation multiple of the droop amplifier is turned down.When the decaying of the programmable attenuator 3
When multiple is transferred to minimum, if the voltage signal that the MCU6 is received also is less than the numerical value of setting, pass through the simulation
Switch 4 closes the programmable attenuator, enables the programmable amplifier.
Further, in the embodiment of the present invention, a kind of measuring device is additionally provided, uses above-mentioned precision is adjustable to adopt
Sample circuit.
In conclusion the adjustable sample circuit of precision of the invention uses programmable amplifier and programmable attenuator,
It, can be with so as to according to selecting certain multiple that zooms in or out to measured signal by the size of sampled signal
With broader sample range；In addition, using analog switch, the analog sampling signal and MCU of input are isolated, thus
The sampled signal of outside is prevented to interfere and influence the sampling accuracy of sample circuit；The analog switch can control sampling letter
Number input disconnection and conducting, improve the safety of sample circuit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of adjustable sample circuit of precision, which is characterized in that including programmable amplifier, programmable attenuator and MCU,
The programmable amplifier, for amplifying electric signal to be sampled；
The programmable attenuator, for electric signal to be sampled to be decayed；
The MCU, for being selected the programmable amplifier and programmable attenuator and controlling programmable amplifier
The attenuation multiple of amplification factor or the programmable attenuator.
2. the adjustable sample circuit of precision as described in claim 1, which is characterized in that further include being put respectively with described may be programmed
The resistor voltage divider circuit that big device is connected with the programmable attenuator, the resistor voltage divider circuit are used for voltage to be sampled
Signal is divided, and the voltage signal after partial pressure is then passed to the programmable amplifier and the programmable attenuator,
The resistor voltage divider circuit is also used to circuit current signal to be sampled being converted to voltage signal, then by the voltage after conversion
Signal passes to the programmable amplifier and the programmable attenuator.
3. the adjustable sample circuit of precision as claimed in claim 2, which is characterized in that the resistor voltage divider circuit includes resistance
Sampled signal is received in one end of R1 and resistance R2, resistance R1, and the other end of one end of another terminating resistor R2, resistance R2 is grounded,
Resistance R1 is connected with the programmable amplifier and the programmable attenuator respectively with the connecting pin of resistance R2.
4. the adjustable sample circuit of precision as described in claim 1, which is characterized in that further include being put respectively with described may be programmed
The analog switch that big device, the programmable attenuator are connected with the MCU, the analog switch are used for according to the MCU's
Instruction disconnects and conducting, and selects the voltage signal for transmitting the programmable amplifier or the programmable attenuator to described
MCU。
5. the adjustable sample circuit of precision as claimed in claim 4, which is characterized in that further include being connected to the analog switch
Voltage follower between the MCU, the voltage follower are used for the voltage signal for passing over the analog switch
Completely pass to the MCU.
6. the adjustable sample circuit of precision as described in claim 1, which is characterized in that the MCU believes the voltage received
It number is detected, if what is currently enabled is the programmable amplifier, when the voltage signal received is more than the range of setting
When, turn down the amplification factor of the programmable amplifier.
7. the adjustable sample circuit of precision as claimed in claim 6, which is characterized in that when the amplification of the programmable amplifier
When multiple is transferred to minimum, if the voltage signal that the MCU is received still is more than the range of setting, close described programmable
Amplifier enables the programmable attenuator.
8. the adjustable sample circuit of precision as described in claim 1, which is characterized in that the MCU believes the voltage received
It number is detected, if what is currently enabled is the programmable attenuator, when the voltage signal received is always less than setting
When numerical value, the attenuation multiple of the droop amplifier is turned down.
9. the adjustable sample circuit of precision as claimed in claim 8, which is characterized in that when the decaying of the programmable attenuator
When multiple is transferred to minimum, if the voltage signal that the MCU is received also is less than the numerical value of setting, close described programmable
Attenuator enables the programmable amplifier.
10. a kind of measuring device, which is characterized in that using such as the adjustable sampling electricity of the described in any item precision of claim 1-9
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001523.0A CN109541442A (en) | 2019-01-02 | 2019-01-02 | The adjustable sample circuit of precision and measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910001523.0A CN109541442A (en) | 2019-01-02 | 2019-01-02 | The adjustable sample circuit of precision and measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109541442A true CN109541442A (en) | 2019-03-29 |
Family
ID=65833957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910001523.0A Withdrawn CN109541442A (en) | 2019-01-02 | 2019-01-02 | The adjustable sample circuit of precision and measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109541442A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532186A (en) * | 2020-11-04 | 2021-03-19 | 杭州爱华仪器有限公司 | Measuring amplifier for audio signal measurement |
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| JP2003018095A (en) * | 2001-07-04 | 2003-01-17 | Synclayer Inc | Optical receiver |
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| CN104242965A (en) * | 2013-06-10 | 2014-12-24 | 三星电机株式会社 | Module and method for receiving RF signal |
| CN204013558U (en) * | 2014-07-17 | 2014-12-10 | 南京创嵘盛信息技术有限公司 | A kind of main signal intensity detecting device of time division signal |
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Application publication date: 20190329 |