CN104467794B - Signal acquisition circuit - Google Patents
Signal acquisition circuit Download PDFInfo
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- CN104467794B CN104467794B CN201410815327.4A CN201410815327A CN104467794B CN 104467794 B CN104467794 B CN 104467794B CN 201410815327 A CN201410815327 A CN 201410815327A CN 104467794 B CN104467794 B CN 104467794B
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Abstract
The signal acquisition circuit of the present invention, including the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal conditioning circuit, the 4th signal conditioning circuit and A/D conversion chips, described the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal conditioning circuit, the 4th signal conditioning circuit pass through an I/O input interface and connect A/D conversion chip inputs respectively, the output end of A/D conversion chips connects a magnetic coupling isolating chip, and A/D conversion chips provide power supply by a 5V reference voltage circuit.Using magnetic coupling isolating chip, the isolation effect between whole analog input circuit and single-chip microcomputer is enhanced；Single A/D chips are employed, conversion speed is faster；Multiple modulate circuits are designed, not only sample rate is fast, and stability is also more preferable；Whole circuit structure is simple, and cost is relatively low, and service life is longer, and stability is more preferable.
Description
Technical field
The present invention relates to the refrigeration system control field of central air-conditioning, specifically a kind of signal acquisition circuit.
Background technology
In central air conditioning system, refrigeration system be it is essential be also vital part, for reality
Show the adjustment efficient, quickly and precisely of chilled water pump, it is necessary to gather the signal of simultaneously conversion sensor within the most fast time, so as to
Make and timely adjusting.In the signal acquisition circuit used in current refrigeration system, the chip and circuit of use are all relatively more multiple
Miscellaneous, not only processing speed is affected, and use cost is higher, has one to the freezing efficiency and effect of Air-condition system control
Fixed influence.
The content of the invention
The invention provides a kind of signal acquisition circuit, the speed of signal acquisition and conversion can be effectively improved, significantly
Reduce cost.
The present invention uses following technical scheme：Signal acquisition circuit, including the conditioning of the first signal conditioning circuit, secondary signal
Circuit, the 3rd signal conditioning circuit, the 4th signal conditioning circuit and A/D conversion chips, described the first signal conditioning circuit,
Binary signal modulate circuit, the 3rd signal conditioning circuit, the 4th signal conditioning circuit connect A/ by an I/O input interface respectively
D conversion chip inputs, the output end of A/D conversion chips connects a magnetic coupling isolating chip, and A/D conversion chips are by a 5V base
Quasi- potential circuit provides power supply.
Further, described A/D conversion chips are chip ADS8341.
Further, described magnetic coupling isolating chip is ADUM1411.
Further, described 5V reference voltage circuits include electric capacity C9, and electric capacity C9 one end connects A/D chips respectively
ADS8341 the 8th pin and the pins of chip MAX6164 the 6th, electric capacity C9 other ends ground connection, electric capacity C10 is in parallel with electric capacity C9, core
Piece MAX6164 second pins connect 5V voltages, chip MAX6164 earth terminals ground connection.
Further, the first described signal conditioning circuit includes resistance R18, the termination 4-20mA electric current letters of resistance R18 mono-
Number input, resistance R18 other ends ground connection, electric capacity C12 is in parallel with resistance R18, and diode D9 positive poles connect 4-20mA current signals
Input, diode D9 negative poles ground connection, amplifier U1 the 13rd pin connecting resistance R13 one end, the resistance R13 other ends connect electricity respectively
Hinder R16 one end, electric capacity C11 one end, slide rheostat R17 one end, another termination 5V voltages of resistance R16, the electric capacity C11 other ends with
The slide rheostat R17 other ends are grounded, and amplifier U1 the 12nd pin connects 4-20mA current signal inputs by resistance R14,
The pins of amplifier U1 the 12nd are grounded by resistance R15, and amplifier U1 the 14th pin connects the 13rd of amplifier U1 by resistance R12
Pin, amplifier U1 the 14th pin connects amplifier U1 the tenth pin by resistance R11, and amplifier U1 the 9th pin is by sliding
Rheostat R10 is grounded, and amplifier U1 the 8th pin is grounded by resistance R9, and amplifier U1 the 8th pin meets A/D by resistance R8
Chip ADS8341 the 5th pin.
Further, described secondary signal modulate circuit includes resistance R29, the termination 4-20mA electric current letters of resistance R29 mono-
Number input, resistance R29 other ends ground connection, electric capacity C14 is in parallel with resistance R29, and diode D10 positive poles connect 4-20mA current signals
Input, diode D10 negative poles ground connection, amplifier U2 the 13rd pin connecting resistance R24 one end, the resistance R24 other ends connect respectively
Resistance R27 one end, electric capacity C13 one end, slide rheostat R28 one end, another termination 5V voltages of resistance R27, the electric capacity C13 other ends
With slide rheostat R28 other ends ground connection, amplifier U2 the 12nd pin connects 4-20mA current signals by resistance R25 and inputted
End, the pins of amplifier U2 the 12nd are grounded by resistance R26, and amplifier U2 the 14th pin connects the of amplifier U2 by resistance R23
13 pins, amplifier U2 the 14th pin connects amplifier U1 the tenth pin by resistance R22, and amplifier U2 the 9th pin passes through
Slide rheostat R21 is grounded, and amplifier U2 the 8th pin is grounded by resistance R20, and amplifier U2 the 8th pin passes through resistance R19
Connect A/D chips ADS8341 the 4th pin.
Further, the 3rd described signal conditioning circuit includes resistance R40, the termination 4-20mA electric current letters of resistance R40 mono-
Number input, resistance R40 other ends ground connection, electric capacity C16 is in parallel with resistance R40, and diode D11 positive poles connect 4-20mA current signals
Input, diode D11 negative poles ground connection, amplifier U3 the 13rd pin connecting resistance R35 one end, the resistance R35 other ends connect respectively
Resistance R38 one end, electric capacity C15 one end, slide rheostat R39 one end, another termination 5V voltages of resistance R38, the electric capacity C15 other ends
With slide rheostat R39 other ends ground connection, amplifier U3 the 12nd pin connects 4-20mA current signals by resistance R36 and inputted
End, the pins of amplifier U3 the 12nd are grounded by resistance R37, and amplifier U3 the 14th pin connects the of amplifier U3 by resistance R34
13 pins, amplifier U3 the 14th pin connects amplifier U3 the tenth pin by resistance R33, and amplifier U3 the 9th pin passes through
Slide rheostat R32 is grounded, and amplifier U3 the 8th pin is grounded by resistance R31, and amplifier U3 the 8th pin passes through resistance R30
Connect A/D chips ADS8341 the 3rd pin.
Further, the 4th described signal conditioning circuit includes resistance R51, the termination 4-20mA electric current letters of resistance R51 mono-
Number input, resistance R51 other ends ground connection, electric capacity C18 is in parallel with resistance R51, and diode D12 positive poles connect 4-20mA current signals
Input, diode D12 negative poles ground connection, amplifier U4 the 13rd pin connecting resistance R46 one end, the resistance R46 other ends connect respectively
Resistance R49 one end, electric capacity C17 one end, slide rheostat R50 one end, another termination 5V voltages of resistance R49, the electric capacity C17 other ends
With slide rheostat R50 other ends ground connection, amplifier U4 the 12nd pin connects 4-20mA current signals by resistance R47 and inputted
End, the pins of amplifier U4 the 12nd are grounded by resistance R48, and amplifier U4 the 14th pin connects the of amplifier U4 by resistance R45
13 pins, amplifier U4 the 14th pin connects amplifier U4 the tenth pin by resistance R44, and amplifier U4 the 9th pin passes through
Slide rheostat R43 is grounded, and amplifier U4 the 8th pin is grounded by resistance R42, and amplifier U4 the 8th pin passes through resistance R41
Connect A/D chips ADS8341 the 2nd pin.
The beneficial effects of the invention are as follows：Using magnetic coupling isolating chip, enhance whole analog input circuit and single-chip microcomputer it
Between isolation effect；Single A/D chips are employed, conversion speed is faster；Multiple modulate circuits are designed, not only sample rate is fast,
And stability is also more preferable；Whole circuit structure is simple, and cost is relatively low, and service life is longer, and stability is more preferable.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the invention.
Embodiment
Signal acquisition circuit as shown in Figure 1, including first, second, third, fourth 4 road signal conditioning circuits and A/D
Conversion chip ADS8341, A/D chip ADS8341 the 9th pin connects 5V voltages, and A/D chips ADS8341 the 1st pin is grounded,
A/D chips ADS8341 the 10th, 11 pins ground connection, A/D chips ADS8341 the 12nd, 13,14,15,16 pins connect isolated core
Piece ADUM1411.
A/D chips ADS8341 the 8th pin connects 5V a reference sources, and 5V a reference sources include electric capacity C9, and electric capacity C9 one end connects respectively
A/D chips ADS8341 the 8th pin and the pins of chip MAX6164 the 6th, electric capacity C9 other ends ground connection, electric capacity C10 and electric capacity C9
Parallel connection, chip MAX6164 second pins connect 5V voltages, chip MAX6164 earth terminals ground connection.
First signal conditioning circuit includes resistance R18, the termination 4-20mA current signal inputs of resistance R18 mono-, resistance R18
The other end is grounded, and electric capacity C12 is in parallel with resistance R18, and diode D9 positive poles connect 4-20mA current signal inputs, and diode D9 is born
Pole is grounded, amplifier U1 the 13rd pin connecting resistance R13 one end, resistance R13 other ends difference connecting resistance R16 one end, electric capacity C11
One end, slide rheostat R17 one end, another termination 5V voltages of resistance R16, the electric capacity C11 other ends and slide rheostat R17 are another
End ground connection, amplifier U1 the 12nd pin connects 4-20mA current signal inputs by resistance R14, and the pins of amplifier U1 the 12nd lead to
Resistance R15 ground connection is crossed, amplifier U1 the 14th pin connects amplifier U1 the 13rd pin, the tenth of amplifier U1 the by resistance R12
Four pins connect amplifier U1 the tenth pin by resistance R11, and amplifier U1 the 9th pin is grounded by slide rheostat R10, fortune
The 8th pin for putting U1 is grounded by resistance R9, and amplifier U1 the 8th pin connects the 5th of A/D chips ADS8341 the by resistance R8
Pin.
Secondary signal modulate circuit includes resistance R29, the termination 4-20mA current signal inputs of resistance R29 mono-, resistance R29
The other end is grounded, and electric capacity C14 is in parallel with resistance R29, and diode D10 positive poles connect 4-20mA current signal inputs, diode D10
Negative pole is grounded, amplifier U2 the 13rd pin connecting resistance R24 one end, resistance R24 other ends difference connecting resistance R27 one end, electric capacity
C13 one end, slide rheostat R28 one end, another termination 5V voltages of resistance R27, the electric capacity C13 other ends and slide rheostat R28
The other end is grounded, and amplifier U2 the 12nd pin connects 4-20mA current signal inputs by resistance R25, and amplifier U2 the 12nd draws
Pin is grounded by resistance R26, and amplifier U2 the 14th pin connects amplifier U2 the 13rd pin by resistance R23, amplifier U2's
14th pin connects amplifier U1 the tenth pin by resistance R22, and amplifier U2 the 9th pin is connect by slide rheostat R21
Ground, amplifier U2 the 8th pin is grounded by resistance R20, and amplifier U2 the 8th pin connects A/D chips by resistance R19
ADS8341 the 4th pin.
3rd signal conditioning circuit includes resistance R40, the termination 4-20mA current signal inputs of resistance R40 mono-, resistance R40
The other end is grounded, and electric capacity C16 is in parallel with resistance R40, and diode D11 positive poles connect 4-20mA current signal inputs, diode D11
Negative pole is grounded, amplifier U3 the 13rd pin connecting resistance R35 one end, resistance R35 other ends difference connecting resistance R38 one end, electric capacity
C15 one end, slide rheostat R39 one end, another termination 5V voltages of resistance R38, the electric capacity C15 other ends and slide rheostat R39
The other end is grounded, and amplifier U3 the 12nd pin connects 4-20mA current signal inputs by resistance R36, and amplifier U3 the 12nd draws
Pin is grounded by resistance R37, and amplifier U3 the 14th pin connects amplifier U3 the 13rd pin by resistance R34, amplifier U3's
14th pin connects amplifier U3 the tenth pin by resistance R33, and amplifier U3 the 9th pin is connect by slide rheostat R32
Ground, amplifier U3 the 8th pin is grounded by resistance R31, and amplifier U3 the 8th pin connects A/D chips by resistance R30
ADS8341 the 3rd pin.
4th signal conditioning circuit includes resistance R51, the termination 4-20mA current signal inputs of resistance R51 mono-, resistance R51
The other end is grounded, and electric capacity C18 is in parallel with resistance R51, and diode D12 positive poles connect 4-20mA current signal inputs, diode D12
Negative pole is grounded, amplifier U4 the 13rd pin connecting resistance R46 one end, resistance R46 other ends difference connecting resistance R49 one end, electric capacity
C17 one end, slide rheostat R50 one end, another termination 5V voltages of resistance R49, the electric capacity C17 other ends and slide rheostat R50
The other end is grounded, and amplifier U4 the 12nd pin connects 4-20mA current signal inputs by resistance R47, and amplifier U4 the 12nd draws
Pin is grounded by resistance R48, and amplifier U4 the 14th pin connects amplifier U4 the 13rd pin by resistance R45, amplifier U4's
14th pin connects amplifier U4 the tenth pin by resistance R44, and amplifier U4 the 9th pin is connect by slide rheostat R43
Ground, amplifier U4 the 8th pin is grounded by resistance R42, and amplifier U4 the 8th pin connects A/D chips by resistance R41
ADS8341 the 2nd pin.
The sensor at scene is collected after signal, sends 4-20mA current signals, and signal conditioning circuit is received after signal,
The voltage signal that 0-5V is converted into after being handled through over-sampling, filtering, protection, difference, amplification etc. reaches chip ADS8341, finally
Single-chip microcomputer is transferred to by magnetic coupling isolating chip.
In addition to structure of the present invention, remaining is prior art.
Simply the preferred embodiment of the present invention described above, for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection domain.
Claims (4)
1. signal acquisition circuit, it is characterised in that including the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal
Modulate circuit, the 4th signal conditioning circuit and A/D conversion chips, described the first signal conditioning circuit, secondary signal conditioning electricity
It is defeated that road, the 3rd signal conditioning circuit, the 4th signal conditioning circuit connect A/D conversion chips by an I/O input interface respectively
Enter end, the output end of A/D conversion chips connects a magnetic coupling isolating chip, and A/D conversion chips are by a 5V reference voltage circuit
Power supply is provided；Described A/D conversion chips are chip ADS8341；Described magnetic coupling isolating chip is ADUM1411；Described
5V reference voltage circuits include electric capacity C9, and electric capacity C9 one end connects A/D chips ADS8341 the 8th pin and chip MAX6164 respectively
6th pin, electric capacity C9 other ends ground connection, electric capacity C10 is in parallel with electric capacity C9, and chip MAX6164 second pins connect 5V voltages, core
Piece MAX6164 earth terminals are grounded；The first described signal conditioning circuit includes resistance R18, the termination 4-20mA electric currents of resistance R18 mono-
Signal input part, resistance R18 other ends ground connection, electric capacity C12 is in parallel with resistance R18, and diode D9 positive poles connect 4-20mA electric currents letter
Number input, diode D9 negative poles ground connection, amplifier U1 the 13rd pin connecting resistance R13 one end, the resistance R13 other ends connect respectively
Resistance R16 one end, electric capacity C11 one end, slide rheostat R17 one end, another termination 5V voltages of resistance R16, the electric capacity C11 other ends
With slide rheostat R17 other ends ground connection, amplifier U1 the 12nd pin connects 4-20mA current signals by resistance R14 and inputted
End, the pins of amplifier U1 the 12nd are grounded by resistance R15, and amplifier U1 the 14th pin connects the of amplifier U1 by resistance R12
13 pins, amplifier U1 the 14th pin connects amplifier U1 the tenth pin by resistance R11, and amplifier U1 the 9th pin passes through
Slide rheostat R10 is grounded, and amplifier U1 the 8th pin is grounded by resistance R9, and amplifier U1 the 8th pin is connect by resistance R8
A/D chips ADS8341 the 5th pin, described amplifier U1 is chip TLC27L4.
2. signal acquisition circuit according to claim 1, it is characterised in that described secondary signal modulate circuit includes electricity
R29 is hindered, the termination 4-20mA current signal inputs of resistance R29 mono-, the resistance R29 other ends are grounded, and electric capacity C14 and resistance R29 is simultaneously
Connection, diode D10 positive poles connect 4-20mA current signal inputs, and diode D10 negative poles ground connection, amplifier U2 the 13rd pin connects
Resistance R24 one end, resistance R24 other ends difference connecting resistance R27 one end, electric capacity C13 one end, slide rheostat R28 one end, resistance
Another termination 5V voltages of R27, the electric capacity C13 other ends and slide rheostat R28 other ends ground connection, amplifier U2 the 12nd pin lead to
Cross resistance R25 and connect 4-20mA current signal inputs, the pins of amplifier U2 the 12nd are grounded by resistance R26, the tenth of amplifier U2 the
Four pins connect amplifier U2 the 13rd pin by resistance R23, and amplifier U2 the 14th pin connects amplifier U1's by resistance R22
Tenth pin, amplifier U2 the 9th pin is grounded by slide rheostat R21, and amplifier U2 the 8th pin is connect by resistance R20
Ground, amplifier U2 the 8th pin connects A/D chips ADS8341 the 4th pin by resistance R19, and described amplifier U2 is chip
TLC27L4。
3. signal acquisition circuit according to claim 1, it is characterised in that the 3rd described signal conditioning circuit includes electricity
R40 is hindered, the termination 4-20mA current signal inputs of resistance R40 mono-, the resistance R40 other ends are grounded, and electric capacity C16 and resistance R40 is simultaneously
Connection, diode D11 positive poles connect 4-20mA current signal inputs, and diode D11 negative poles ground connection, amplifier U3 the 13rd pin connects
Resistance R35 one end, resistance R35 other ends difference connecting resistance R38 one end, electric capacity C15 one end, slide rheostat R39 one end, resistance
Another termination 5V voltages of R38, the electric capacity C15 other ends and slide rheostat R39 other ends ground connection, amplifier U3 the 12nd pin lead to
Cross resistance R36 and connect 4-20mA current signal inputs, the pins of amplifier U3 the 12nd are grounded by resistance R37, the tenth of amplifier U3 the
Four pins connect amplifier U3 the 13rd pin by resistance R34, and amplifier U3 the 14th pin connects amplifier U3's by resistance R33
Tenth pin, amplifier U3 the 9th pin is grounded by slide rheostat R32, and amplifier U3 the 8th pin is connect by resistance R31
Ground, amplifier U3 the 8th pin connects A/D chips ADS8341 the 3rd pin by resistance R30, and described amplifier U3 is chip
TLC27L4。
4. signal acquisition circuit according to claim 1, it is characterised in that the 4th described signal conditioning circuit includes electricity
R51 is hindered, the termination 4-20mA current signal inputs of resistance R51 mono-, the resistance R51 other ends are grounded, and electric capacity C18 and resistance R51 is simultaneously
Connection, diode D12 positive poles connect 4-20mA current signal inputs, and diode D12 negative poles ground connection, amplifier U4 the 13rd pin connects
Resistance R46 one end, resistance R46 other ends difference connecting resistance R49 one end, electric capacity C17 one end, slide rheostat R50 one end, resistance
Another termination 5V voltages of R49, the electric capacity C17 other ends and slide rheostat R50 other ends ground connection, amplifier U4 the 12nd pin lead to
Cross resistance R47 and connect 4-20mA current signal inputs, the pins of amplifier U4 the 12nd are grounded by resistance R48, the tenth of amplifier U4 the
Four pins connect amplifier U4 the 13rd pin by resistance R45, and amplifier U4 the 14th pin connects amplifier U4's by resistance R44
Tenth pin, amplifier U4 the 9th pin is grounded by slide rheostat R43, and amplifier U4 the 8th pin is connect by resistance R42
Ground, amplifier U4 the 8th pin connects A/D chips ADS8341 the 2nd pin by resistance R41, and described amplifier U4 is chip
TLC27L4。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815327.4A CN104467794B (en) | 2014-12-25 | 2014-12-25 | Signal acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815327.4A CN104467794B (en) | 2014-12-25 | 2014-12-25 | Signal acquisition circuit |
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| CN104467794A CN104467794A (en) | 2015-03-25 |
| CN104467794B true CN104467794B (en) | 2017-10-24 |
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| CN201410815327.4A Active CN104467794B (en) | 2014-12-25 | 2014-12-25 | Signal acquisition circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109001566B (en) * | 2018-06-29 | 2020-07-31 | 国网河南省电力公司襄城县供电公司 | Intelligent warning board for transformer substation |
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|---|---|---|---|---|
| CN1558190A (en) * | 2004-01-16 | 2004-12-29 | 湖南科技大学 | Digital vibration and impact sensor |
| CN203719811U (en) * | 2014-01-14 | 2014-07-16 | 南京信息工程大学 | Weak voltage signal detection device of micro-voltage sensor |
| CN203732101U (en) * | 2014-03-14 | 2014-07-23 | 西安科技大学 | Signal collection and transmission device for portable coal mine machinery equipment performance testing instrument |
| CN204349962U (en) * | 2014-12-25 | 2015-05-20 | 李钢 | Signal acquisition circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3434301B2 (en) * | 1992-02-28 | 2003-08-04 | カシオ計算機株式会社 | Timing extraction method and timing extraction circuit |
-
2014
- 2014-12-25 CN CN201410815327.4A patent/CN104467794B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558190A (en) * | 2004-01-16 | 2004-12-29 | 湖南科技大学 | Digital vibration and impact sensor |
| CN203719811U (en) * | 2014-01-14 | 2014-07-16 | 南京信息工程大学 | Weak voltage signal detection device of micro-voltage sensor |
| CN203732101U (en) * | 2014-03-14 | 2014-07-23 | 西安科技大学 | Signal collection and transmission device for portable coal mine machinery equipment performance testing instrument |
| CN204349962U (en) * | 2014-12-25 | 2015-05-20 | 李钢 | Signal acquisition circuit |
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