CN106774029A - High-precision analog signal isolation conversion output system - Google Patents
High-precision analog signal isolation conversion output system Download PDFInfo
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- CN106774029A CN106774029A CN201710132421.3A CN201710132421A CN106774029A CN 106774029 A CN106774029 A CN 106774029A CN 201710132421 A CN201710132421 A CN 201710132421A CN 106774029 A CN106774029 A CN 106774029A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 37
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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Abstract
The invention discloses a kind of high-precision analog signal isolation conversion output system, carry out the isolation module of isolation processing and and the data signal after the isolation module isolation processing is converted into the restoration module of analog signal for converting analog signals into the sampling module of data signal, the data signal of sampling module acquisition described in a pair with one.Offer of the invention is a kind of using AD/DA sampling digitizing isolation methods, directly the analog signal being input into is acquired and is input into completely isolated with output, insulated from each other, the high-precision analog signal isolation conversion output system of elimination noise coupling with reduction, realization.
Description
Technical field
The present invention relates to analog signal isolating export technique field, more particularly to a kind of conversion of high-precision analog signal isolation
Output system.
Background technology
In the systems such as data acquisition, measurement, computer real-tune TT ＆ C, analog signal conditioning circuit is indispensable group
Into part.Under many circumstances, between analog signal processing circuit front stage due to transmission, character of circuit, device used etc. because
Element and can not altogether, it is necessary to be simulated signal isolation, will the analog signal of analog signal processing circuit prime pass through light, magnetic
Analog signal processing circuit rear class is passed to etc. non-dielectric, and disclosure satisfy that reaching certain error, speed, noise etc. refers to
Mark.Traditional analog signal isolating method has transformer isolation and linear optical coupling etc., in the presence of some clearly disadvantageous parts.Such as
Conventional analog signal transformer isolation method can only be directed to specific frequency and the signal of wave band is filtered and isolated；Linearly
Optocoupler analog signal isolating method is most easy and effective analog signal isolating method in the prior art, but because optocoupler transmission is prolonged
It is larger late, to ensure that switching device opens the accuracy with shut-off, it is necessary to which the structural parameters on Shi Ge roads are consistent, the delay on Shi Ge roads
Unanimously, and this is often difficult to, and the switching speed of optocoupler is slower, to the front and rear along producing larger time delay, shadow of driving pulse
Ring control accuracy.
The content of the invention
The present invention is deposited when carrying out isolation processing to analog signal for the partition method such as optocoupler of the prior art or magnetic coupling
In the isolation not high defect of conversion accuracy, it is therefore intended that provide a kind of using AD/DA sampling digitizing isolation methods, directly to defeated
The analog signal for entering is acquired and reduces, and realizes input and exports completely isolated, eliminates the high-precision analog letter of noise coupling
Number isolation conversion output system.
Realizing the technical scheme of above-mentioned purpose is：
High-precision analog signal isolation conversion output system of the present invention, the isolation conversion output system is sequentially connected in series
Having one is used to convert analog signals into the sampling module of data signal, a control module, sampling module acquisition described in a pair
Data signal carries out the isolation module of isolation processing and and the data signal after the isolation module isolation processing is converted into mould
Intend the restoration module of signal；The control module be for control the sampling module convert analog signals into data signal and
Control the restoration module that the data signal after the isolation module isolation processing is converted into the control module of analog signal.
The sampling module be sequentially connected in series one for gather be input into analog signal voltage positive-negative polarity symbol
The analog signal of input is converted into the absolute value circuit of its correspondence absolute value and and processes the absolute value circuit by circuit, one
Analog signal afterwards is converted into the AD sampling A/D chips of data signal；The AD sampling A/D chips and the control AD sampling A/D chips pair
The control module that the analog signal of input is sampled is connected in series, and the symbolic circuit is connected in series with the control module.
The isolation module have one with the control module be connected in series for carrying out isolation processing to data signal
Isolation Serial Peripheral Interface (SPI) circuit and be used to provide the isolated DC-DC change-over circuit of isolated working voltage.
The restoration module has a DA circuits, and the DA circuits have one to isolate Serial Peripheral Interface (SPI) circuit string with described
Join the high accuracy DA chips of connection and the analog signal that the high accuracy DA chips are obtained is adjusted and is increased by export ratio
The operational amplifier of making alive biasing；The control module controls the high accuracy DA chips by the isolation Serial Peripheral Interface (SPI)
Data signal after circuit isolation processing is converted into corresponding analog signal；The isolated DC-DC change-over circuit with it is described
High accuracy DA chip-in series are connected, for providing isolated working voltage to the high accuracy DA chips, the operational amplifier.
The isolation conversion output system has one for being input into outside DA input modules, one of analog signal for exporting
The isolation DA output modules of the analog signal after isolation processing；It is provided between the outside DA input modules and the sampling module
One first voltage for being used to increase analog signal input impedance follows circuit；The restoration module isolates DA output modules with described
Between be provided with a second voltage for increasing analog signal input impedance and follow circuit.
The symbolic circuit has resistance R6~resistance R10 and operational amplifier U4A；One end of the resistance R6 and simulation
Signal U1 is connected in series, other end one end, one end of the resistance R7, the operational amplifier successively with the resistance R8
No. 3 pin serial connections connection of U4A, No. 2 pins of operational amplifier U4A one end, the electricity respectively with the resistance R9
Hinder one end connection of R10；The power supply of the other end of the resistance R7, the other end of the resistance R9 with the symbolic circuit is electric
Pressure is connected in series, and the other end of the resistance R8, the other end of the resistance R10 are connected in series with earth terminal；The computing
No. 1 pin of amplifier U4A is the output end of the analog signal U1 polarity of voltage results of collection, company of being connected with the control module
Connect；
The absolute value circuit have resistance R2~resistance R5, operational amplifier U2, operational amplifier U3, diode D1 and
Diode D2；No. 2 pins of the operational amplifier U2 are connected in series with the analog signal U1, and No. 7 pins are absolute with described
The positive supply of value circuit is connected in series, and No. 4 pins are connected in series with the negative supply of the absolute value circuit, No. 6 pins respectively with
No. 2 pins connection of No. 1 pin and diode D2 of diode D1, No. 3 pins are connected in series with earth terminal；One end of resistance R2
It is connected with No. 2 pin serial connections of the operational amplifier U2, the other end is connected with No. 2 pin serial connections of diode D1, resistance R3
One end be connected with No. 2 pin serial connections of the operational amplifier U2, No. 1 pin of the other end and diode D2 and resistance R4's
One end is connected in series；The other end of resistance R4 is connected in series with No. 2 pins of operational amplifier U3 and one end of resistance R5, two poles
No. 2 pins of pipe D1 are connected with No. 3 pin serial connections of operational amplifier U3；No. 7 pins of the operational amplifier U3 with it is described
The positive supply of absolute value circuit is connected in series, and No. 4 pins are connected in series with the negative supply of the absolute value circuit, and No. 6 pins are
The output end of the analog signal U2 that output is processed by the absolute value circuit, the other end and the AD sampling A/D chips with resistance R5
It is connected in series.
It is described isolation Serial Peripheral Interface (SPI) circuit have No. 1 pin of isolating chip U8, the isolating chip U8 with it is described
The supply voltage for isolating Serial Peripheral Interface (SPI) circuit is connected in series, and No. 3 pins are connected in series with Enable Pin SS, No. 4 pins and I2C
The clock control line SCK of line is connected in series, and No. 5 pins are connected in series with main output from input MOSI, No. 6 pins and primary input
It is connected in series from output end MISO, No. 11 pins are connected in series with serial data output port DOUT, No. 12 pins and serial number
It is connected in series according to input port DIN, No. 13 pins are connected in series with serial clock SCLK, No. 14 pins are connected with chip selection signal CS
Connection, No. 16 pins are connected in series with negative supply voltage VEE, No. 2 pins, No. 8 pins, No. 9 pins and No. 15 pins with connect
Ground terminal is connected in series.
The DA circuits have resistance R11, high accuracy DA chips U5 and operational amplifier U6；The high accuracy DA chips U5
No. 1 pin be connected in series with reference voltage, No. 2 pins are connected in series with chip selection signal CS, and No. 3 pins are input into clock sequence
End CLK is connected in series, and No. 4 pins are connected in series with serial data input port DIN, the power supply of No. 7 pins and the DA circuits
Voltage Series are connected, and No. 8 pins are connected with earth terminal, and No. 6 pins are connected with No. 3 pin serial connections of the operational amplifier U6；
One end of resistance R11 is connected with No. 2 pin serial connections of the operational amplifier U6, the other end and the 6 of the operational amplifier U6
Number pin serial connection connects；No. 7 pins of the operational amplifier U6 and the positive electricity subject string of the supply voltage of the operational amplifier U6
Connection connection, No. 4 pins are connected in series with the negative supply of the supply voltage of operational amplifier U6, and No. 6 pins are with described to isolate DA defeated
Go out module to be connected in series.
The isolation DA output modules have resistance R12, resistance R13 and operational amplifier U7；Resistance R12 one end and ground connection
End connection, the other end is connected in series with No. 2 pins of the operational amplifier U7 and one end of resistance R13, and resistance R13's is another
End is connected in series with signal positive feedback end, No. 3 pins of the operational amplifier U7 and the operational amplifier U6 of the DA circuits
No. 6 pins and one end of resistance R14 be connected in series, the other end and the signal negative-feedback end of resistance R14 are connected in series；The fortune
No. 7 pins for calculating amplifier U7 are connected in series with the positive supply of the supply voltage of operational amplifier U7, No. 4 pins and operation amplifier
The negative supply of the supply voltage of device U7 is connected in series, and No. 5 pins are connected with earth terminal, and No. 6 pins are analog signal output.
The voltage follower circuit has electric capacity C1 and operational amplifier U1A；One end of electric capacity C1 and input voltage signal
No. 3 pin serial connections connection of Uin and operational amplifier U1A, the other end and the earth terminal of electric capacity C1 are connected in series；Operational amplifier
No. 2 pins of U1 are connected with No. 1 pin serial connection of the operational amplifier U1A of output analog signal voltage U1, operational amplifier U1
No. 8 pins be connected in series with the positive supply of the voltage follower circuit, the negative supply of No. 4 pins and the voltage follower circuit
It is connected in series.
Positive effect of the invention is：
High-precision analog signal isolation conversion output system of the invention, it is to avoid use light-coupled isolation of the prior art
The isolation of the method to analog signal such as isolate with magnetic coupling and cause the not high defect of precision, isolated using AD/DA sampling digitizings
Mode, isolates to data signal, and error is smaller by load effect, realizes that isolation signals are substantially undistorted, while can be directed to
Generating positive and negative voltage carries out high accuracy isolation and without dead band, proportional to input signal DA values can adjust isolation and amplifier DA values, is applicable
Sampling or the occasion of analog output in high-precision requirement.
The technique effect of design of the invention, concrete structure and generation is described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description of the drawings
Fig. 1 is the structural representation of high-precision analog signal isolation conversion output system of the present invention；
Fig. 2 is the symbolic circuit figure of high-precision analog signal isolation conversion output system of the present invention；
Fig. 3 is the absolute value circuit figure of high-precision analog signal isolation conversion output system of the present invention；
Fig. 4 is the isolation Serial Peripheral Interface (SPI) circuit diagram of high-precision analog signal isolation conversion output system of the present invention；
Fig. 5 is the DA circuit diagrams of the restoration module of high-precision analog signal isolation conversion output system of the present invention；
Fig. 6 is high-precision analog signal isolation conversion output system voltage follower circuit figure of the present invention；
Fig. 7 is the four-wire system output of the isolation DA output modules of high-precision analog signal isolation conversion output system of the present invention
Circuit diagram；
Fig. 8 is the operation principle block diagram of high-precision analog signal isolation conversion output system of the present invention.
Specific embodiment
With reference to Fig. 1 to Fig. 8, high-precision analog signal isolation conversion output system of the invention is carried out specifically
It is bright.
As shown in figure 1, the high-precision analog signal isolation conversion output system of the present embodiment, be sequentially connected in series for
Convert analog signals into the sampling module 10 of data signal, control module 20, the data signal that sampling module 10 is obtained is entered
The isolation module 30 of row isolation processing, the recovery mould that the data signal after the isolation processing of isolation module 30 is converted into analog signal
Block 40, the isolation DA outputs for being input into the outside DA input modules 50 of analog signal and for exporting the analog signal after isolation
Module 60.For controlling, sampling module 10 converts analog signals into data signal to control module 20 and control restoration module 40 will
Data signal after the isolation module isolation processing is converted into analog signal.Wherein, DA is represented and for digital quantity to be converted to simulation
Amount, AD is represented and for analog quantity to be converted into digital quantity.In one preferred embodiment, control module 20 is single-chip microcomputer.
As shown in Figures 2 to 4, sampling module 10 is sequentially connected in series positive and negative for gathering the voltage of input analog signal
The symbolic circuit 11 of polarity, by the analog signal of input be converted into its correspondence absolute value absolute value circuit 12 and by absolute value electricity
Analog signal after the treatment of road 12 is converted into the AD sampling A/D chips 13 of data signal.AD sampling A/D chips 13, symbolic circuit 11 are equal
Directly it is connected in series with control module 20, the analog signal of the control AD 13 pairs of inputs of sampling A/D chip of control module 20 is sampled.
Control module 20 can obtain the desired value of the corresponding analog signal of data signal of the sampling of AD sampling A/D chips 13.
As shown in Fig. 2 symbolic circuit 11 has resistance R6~resistance R10 and operational amplifier U4A；One end of resistance R6 with
Analog signal U1 is connected in series, the other end and one end, one end of resistance R7, the first operational amplifier U4A successively with resistance R8
The connection of No. 3 pin serial connections, No. 2 pins of the first operational amplifier U4A one end, one end of resistance R10 respectively with resistance R9
Connection；The other end of resistance R7, the other end of resistance R9 are connected in series with the supply voltage of symbolic circuit, and resistance R8's is another
End, the other end of resistance R10 are connected in series with earth terminal GND；No. 1 pin of the first operational amplifier U4A is simulated for output
The output end of signal U1 polarity of voltages, is connected in series with control module 20.
Operational amplifier U4A's act as voltage comparator, and resistance R5 and resistance R7 plays partial pressure effect, input
Analog signal U1 voltages drop to the value that will not damage operational amplifier U4A, and No. 2 pin ground connection represent that comparing voltage value is zero.When
Analog signal U1 be on the occasion of when, operational amplifier U4A export+5V magnitude of voltage；When analog signal U1 is negative value, operation amplifier
Device U4A is output as 0V, so as to the purpose that the analog signal U1 voltages positive-negative polarity reached to being input into judges.
As shown in figure 3, absolute value circuit has resistance R2~resistance R5, operational amplifier U2, operational amplifier U3, two poles
Pipe D1 and diode D2；No. 2 pins of operational amplifier U2 connect with No. 1 pin serial connection of the operational amplifier U4A of symbolic circuit
Connect, No. 7 pins are connected in series with the positive supply of absolute value circuit, No. 4 pins are connected in series with the negative supply of absolute value circuit, 6
Number pin is connected with No. 1 pin of diode D1 and No. 2 pins of diode D2 respectively, and No. 3 pins are connected company with earth terminal GND
Connect；One end of resistance R2 is connected with No. 2 pin serial connections of the operational amplifier U2, No. 2 pins of the other end and diode D1
It is connected in series, one end of resistance R3 is connected with No. 2 pin serial connections of operational amplifier U2, and the other end draws with No. 1 of diode D2
One end of pin and resistance R4 are connected in series；The other end of resistance R4 and No. 2 pins of operational amplifier U3 and one end of resistance R5
It is connected in series, No. 2 pins of diode D1 are connected with No. 3 pin serial connections of operational amplifier U3；No. 7 of operational amplifier U3 are drawn
Pin is connected in series with the positive supply of absolute value circuit, and No. 4 pins are connected in series with the negative supply of absolute value circuit, and No. 6 pins are
The output end of the analog signal U2 processed by absolute value circuit is exported, is connected with the other end and the AD sampling A/D chips of resistance R5
Connection.
When input analog signal U1 be on the occasion of when, diode D2 conducting and diode D1 end, by two stage amplifer it
Afterwards, obtain size it is constant on the occasion of；When the analog signal U1 of input is negative value, diode D1 is turned on and diode D2 ends,
After two stage amplifer, the analog signal U1 of input by negative value become on the occasion of.
Isolation module 30 has isolates with what control module 20 was connected in series for carrying out isolation processing to data signal
Serial Peripheral Interface (SPI) circuit 31 and the (isolated DC-straight of isolated DC-DC change-over circuit 32 for providing isolated working voltage
Stream change-over circuit, is also called isolation DC/DC circuits).
As shown in figure 4, isolation Serial Peripheral Interface (SPI) circuit 31 has an isolating chip U8, No. 1 pin of isolating chip U8 with
The supply voltage VCC of isolation Serial Peripheral Interface (SPI) circuit 31 is connected in series, and No. 3 pins are connected in series with Enable Pin SS, No. 4 pins
Clock control line SCK with I2C lines is connected in series, and No. 5 pins are connected in series with main output from input MOSI, No. 6 pins with
Primary input is connected in series from output end MISO, and No. 11 pins are connected in series with serial data output port DOUT, No. 12 pins with
Serial data input port DIN is connected in series, and No. 13 pins are connected in series with serial clock SCLK, No. 14 pins and chip selection signal
CS is connected in series, and No. 16 pins are connected in series with negative supply voltage VEE, No. 2 pins, No. 8 pins, No. 9 pins and No. 15 pins
It is connected in series with earth terminal.The single-chip microcomputer of control module 20 is led to restoration module 40 by isolating Serial Peripheral Interface (SPI)
News, the purpose of communication isolation is reached by isolating chip U8.
Restoration module 40 has DA circuits 41, and DA circuits 41 have and isolate what Serial Peripheral Interface (SPI) circuit 31 was connected in series
High accuracy DA chips 411 and the analog signal that high accuracy DA chips 411 are obtained is adjusted by export ratio and increases voltage
The operational amplifier 412 of biasing.The control high accuracy DA of control module 20 chips 411 isolate isolation Serial Peripheral Interface (SPI) circuit 31
Data signal after treatment is converted into corresponding analog signal.Isolated DC-DC change-over circuit 32 and high accuracy DA chips 411
It is connected in series, for providing isolated working voltage to high accuracy DA chips 411, operational amplifier 412.
As shown in fig. 6, DA circuits 41 have resistance R11, high accuracy DA chips U5 and operational amplifier U6.High accuracy DA cores
No. 1 pin of piece U5 is connected in series with reference voltage Vref, and No. 2 pins are connected in series with chip selection signal CS, No. 3 pins and clock
Sequence inputting end CLK is connected in series, and No. 4 pins are connected in series with serial data input port DIN, No. 7 pins and DA circuits 41
Supply voltage be connected in series, No. 8 pins are connected with earth terminal GND, No. 3 pin serial connections of No. 6 pins and operational amplifier U6
Connection.One end of resistance R11 is connected with No. 2 pin serial connections of operational amplifier U6, and the other end draws with No. 6 of operational amplifier U6
Pin series connection connects.No. 7 pins and the positive supply of the supply voltage of operational amplifier U6 of operational amplifier U6 are connected in series, and No. 4 are drawn
Pin is connected in series with the negative supply of the supply voltage of operational amplifier U6, and No. 6 pins are connected in series with DA output modules 60 are isolated.
High accuracy DA chips U5 is communicated with the single-chip microcomputer of control module 20 by isolating Serial Peripheral Interface (SPI) circuit 31, output voltage
To No. 3 pins of operational amplifier U6, negative-feedback circuit, the output voltage values for being needed are constituted by resistance R11.
The first electricity for increasing analog signal input impedance is provided between outside DA input modules 50 and sampling module 10
Pressure follows circuit 70；Restoration module 40 with isolate be provided between DA output modules 60 for increase analog signal input impedance
Two voltage follower circuits 80.
As shown in fig. 6, first voltage follows circuit 70, second voltage to follow circuit 80 to be respectively provided with electric capacity C1 and operation amplifier
Device U1A.One end of electric capacity C1 is connected with No. 3 pin serial connections of input voltage signal Uin and operational amplifier U1A, electric capacity C1's
The other end is connected in series with earth terminal GND；No. 2 pins of operational amplifier U1 and the operation amplifier for exporting analog signal voltage U1
No. 1 pin serial connection connection of device U1A, No. 8 pins of operational amplifier U1 are connected company with the positive supply VCC+ of voltage follower circuit
Connect, No. 4 pins are connected in series with the negative supply VCC- of the voltage follower circuit.
By No. 3 pins of operational amplifier U1A as voltage input signal, the anode 3 of operational amplifier U1A draws
Pin as voltage signal input, No. 2 pins of negative terminal are directly connected with No. 1 pin of output end of operational amplifier U1A, are formed
Feedback circuit, increases the input impedance of circuit.
As shown in fig. 7, isolation DA output modules 60 have resistance R12, resistance R13 and operational amplifier U7.Resistance R12 mono-
End is connected with earth terminal GND, and the other end is connected in series with No. 2 pins of operational amplifier U7 and one end of resistance R13, resistance
The other end of R13 is connected in series with signal positive feedback end, No. 3 pins of operational amplifier U7 and the operational amplifier of DA circuits 41
No. 6 pins of U6 and one end of resistance R14 are connected in series, and the other end and the signal negative-feedback end of resistance R14 are connected in series；Computing
No. 7 pins and the positive supply of the supply voltage of operational amplifier U7 of amplifier U7 are connected in series, No. 4 pins and operational amplifier
The negative supply of the supply voltage of U7 is connected in series, and No. 5 pins are connected with earth terminal GND, and No. 6 pins are analog signal output.
Resistance R12 and resistance R13 composition feedback circuits, differential signal is formed with the feedback circuit that resistance R14 is constituted, and is exported by amplifier
As Sign+ and VOUT, while used as load positive terminal, Sign- and GND is used as carrying ground end.
As shown in figure 8, the operation principle of high-precision analog signal isolation conversion output system of the present invention is specific as follows：
Step1, by the input system of outside DA input module 50, analog signal DA values are K1 to analog signal；
Step2, the polarity of voltage of the analog signal of input is gathered by symbolic circuit 11 and collection result is sent into control
Molding block 20；The analog signal DA values K1 being input into by absolute value circuit 12 is converted to corresponding absolute value | K1 |；
It is right that Step3, the control AD of control module 20 sampling A/D chip 13 pairs obtains analog signal DA values via absolute value circuit 12
Absolute value | the K1 | for answering carries out sampling processing, obtains the corresponding data signal AD values of analog signal DA values, control module 20 via
The AD values for collecting obtain its corresponding target DA value；
Step4, the analog signal voltage polarity data of the collection collection of symbolic circuit 11 of control module 20, judges input simulation
Whether signal is low level, i.e. the analog signal voltage polarity of the collection of symbolic circuit 11 is negative polarity, if symbolic circuit 11 is
Low level, the then analog signal being input into is negative voltage, and control module 20 is by isolating the Communication Control of Serial Peripheral Interface (SPI) circuit 31
The output desired value K ' of high accuracy DA chips 41=- | K1 |+K2, wherein K2 are side-play amount, it is ensured that-| K1 |+K2>0.Wherein, K2
Value is any satisfaction guarantee-| K1 |+K2>0 arbitrary value.If symbolic circuit 11 is not low level, then the simulation letter being input into
Number it is positive voltage, control module 20 is by isolating output phase of the Communication Control high accuracy DA chips 41 of Serial Peripheral Interface (SPI) circuit 31
Prestige value K '=K1+K2, K2 are side-play amount, K1+K2>0.Wherein, K2 values meet guarantee K1+K2 for any>0 arbitrary value.
After the output desired value K ' of Step5, high accuracy DA chip 41 is translated into isolation via operational amplifier 42
Analog signal K1 '=a*K ', wherein a are linear scale value, a>0；In one preferred embodiment, a spans are 0~2；
Step6, the analog signal K1 ' after isolation is exported via isolation DA output modules 60.
Claims (10)
1. a kind of high-precision analog signal isolation conversion output system, it is characterised in that the isolation conversion output system is successively
Be connected in series with one for converting analog signals into the sampling module of data signal, a control module, mould of sampling described in a pair
The data signal that block is obtained carries out the isolation module and of isolation processing by the data signal after the isolation module isolation processing
It is converted into the restoration module of analog signal；The control module is for controlling the sampling module to convert analog signals into number
The data signal after the isolation module isolation processing is converted into the control of analog signal for word signal and the control restoration module
Molding block.
2. high-precision analog signal isolation conversion output system as claimed in claim 1, it is characterised in that
The sampling module be sequentially connected in series one for gather be input into analog signal voltage positive-negative polarity symbolic circuit,
The analog signal of input is converted into the absolute value circuit of its correspondence absolute value and by after absolute value circuit treatment by one
Analog signal is converted into the AD sampling A/D chips of data signal；The AD sampling A/D chips and the control AD sampling A/D chips are to input
The control module sampled of analog signal be connected in series, the symbolic circuit is connected in series with the control module.
3. high-precision analog signal isolation conversion output system as claimed in claim 2, it is characterised in that the isolation module
With one with the control module be connected in series for data signal is carried out isolation processing isolate Serial Peripheral Interface (SPI) electricity
Road and one is used to provide the isolated DC-DC change-over circuit of isolated working voltage.
4. high-precision analog signal isolation conversion output system as claimed in claim 3, it is characterised in that the restoration module
With a DA circuits, the DA circuits have one with the high accuracy DA chips for isolating the connection of Serial Peripheral Interface (SPI) circuit connected in series
It is adjusted by export ratio and increases the operation amplifier of voltage bias with by the analog signal that the high accuracy DA chips are obtained
Device；The control module controls the high accuracy DA chips by the numeral after the isolation Serial Peripheral Interface (SPI) circuit isolation processing
Signal is converted into corresponding analog signal；The isolated DC-DC change-over circuit is connected with the high accuracy DA chip-in series,
For providing isolated working voltage to the high accuracy DA chips, the operational amplifier.
5. high-precision analog signal isolation conversion output system as claimed in claim 1, it is characterised in that the isolation conversion
Output system has one for being input into outside DA input modules, one of analog signal for exporting the analog signal after isolation processing
Isolation DA output modules；One is provided between the outside DA input modules and the sampling module defeated for increasing analog signal
The first voltage for entering impedance follows circuit；The restoration module with it is described isolate one is provided between DA output modules for increasing mould
The second voltage for intending signal input impedance follows circuit.
6. high-precision analog signal isolation conversion output system as claimed in claim 2, it is characterised in that the symbolic circuit
With resistance R6~resistance R10 and operational amplifier U4A；One end of the resistance R6 is connected in series with analog signal U1, another
End one end successively with the resistance R8, one end of the resistance R7, No. 3 pin serial connections of the operational amplifier U4A are connected,
No. 2 pins of operational amplifier U4A one end respectively with the resistance R9, one end of the resistance R10 are connected；The electricity
Hinder the supply voltage of the other end, the other end of the resistance R9 of R7 with the symbolic circuit to be connected in series, the resistance R8
The other end, the other end of the resistance R10 is connected in series with earth terminal；No. 1 pin of the operational amplifier U4A is to adopt
The output end of the analog signal U1 polarity of voltage results of collection, is connected in series with the control module；
The absolute value circuit has resistance R2~resistance R5, operational amplifier U2, operational amplifier U3, diode D1 and two poles
Pipe D2；No. 2 pins of the operational amplifier U2 are connected in series with the analog signal U1, and No. 7 pins and the absolute value are electric
The positive supply on road is connected in series, and No. 4 pins are connected in series with the negative supply of the absolute value circuit, No. 6 pins respectively with two poles
No. 2 pins connection of No. 1 pin and diode D2 of pipe D1, No. 3 pins are connected in series with earth terminal；One end of resistance R2 and institute
No. 2 pin serial connections connection of operational amplifier U2 is stated, the other end is connected with No. 2 pin serial connections of diode D1, the one of resistance R3
End is connected with No. 2 pin serial connections of the operational amplifier U2, No. 1 pin and one end of resistance R4 of the other end and diode D2
It is connected in series；The other end of resistance R4 is connected in series with No. 2 pins of operational amplifier U3 and one end of resistance R5, diode D1
No. 2 pins be connected with No. 3 pin serial connections of operational amplifier U3；No. 7 pins of the operational amplifier U3 are absolute with described
The positive supply of value circuit is connected in series, and No. 4 pins are connected in series with the negative supply of the absolute value circuit, and No. 6 pins are output
The output end of the analog signal U2 processed by the absolute value circuit, connects with the other end and the AD sampling A/D chips of resistance R5
Connection.
7. high-precision analog signal isolation conversion output system as claimed in claim 3, it is characterised in that the isolation is serial
No. 1 pin that peripheral interface circuit has isolating chip U8, the isolating chip U8 isolates Serial Peripheral Interface (SPI) circuit with described
Supply voltage be connected in series, No. 3 pins are connected in series with Enable Pin SS, and No. 4 pins are gone here and there with the clock control line SCK of I2C lines
Connection connection, No. 5 pins are connected in series with main output from input MOSI, and No. 6 pins and primary input are connected company from output end MISO
Connect, No. 11 pins are connected in series with serial data output port DOUT, No. 12 pins are connected company with serial data input port DIN
Connect, No. 13 pins are connected in series with serial clock SCLK, No. 14 pins are connected in series with chip selection signal CS, No. 16 pins and negative electricity
Source voltage VEE is connected in series, and No. 2 pins of the isolating chip U8, No. 8 pins, No. 9 pins and No. 15 pins are and earth terminal
It is connected in series.
8. high-precision analog signal isolation conversion output system as claimed in claim 4, it is characterised in that the DA circuits tool
There are resistance R11, high accuracy DA chips U5 and operational amplifier U6；No. 1 pin and reference voltage of the high accuracy DA chips U5
Vref is connected in series, and No. 2 pins are connected in series with chip selection signal CS, and No. 3 pin pin are connected company with clock sequence input CLK
Connect, No. 4 pins are connected in series with serial data input port DIN, No. 7 pins are connected company with the supply voltage of the DA circuits
Connect, No. 8 pins are connected with earth terminal GND, No. 6 pins are connected with No. 3 pin serial connections of the operational amplifier U6；Resistance R11
One end be connected with No. 2 pin serial connections of the operational amplifier U6, No. 6 pin strings of the other end and the operational amplifier U6
Connection connects；No. 7 pins of the operational amplifier U6 are connected in series with the positive supply of the supply voltage of the operational amplifier U6, and 4
Number pin is connected in series with the negative supply of the supply voltage of operational amplifier U6, and No. 6 pins isolate DA output module strings with described
Connection connection.
9. high-precision analog signal isolation conversion output system as claimed in claim 5, it is characterised in that the isolation DA is defeated
Going out module has resistance R12, resistance R13 and operational amplifier U7；Resistance R12 one end is connected with earth terminal, the other end with it is described
No. 2 pins of operational amplifier U7 and one end of resistance R13 are connected in series, and the other end and the signal positive feedback end of resistance R13 are gone here and there
Connection connection, No. 3 pins of the operational amplifier U7 and No. 6 pins and resistance R14 of the operational amplifier U6 of the DA circuits
One end be connected in series, the other end and the signal negative-feedback end of resistance R14 are connected in series；No. 7 of the operational amplifier U7 are drawn
Pin is connected in series with the positive supply of the supply voltage of operational amplifier U7, the supply voltage of No. 4 pins and operational amplifier U7
Negative supply is connected in series, and No. 5 pins are connected with earth terminal, and No. 6 pins are analog signal output.
10. high-precision analog signal isolation conversion output system as claimed in claim 5, it is characterised in that the voltage with
There is electric capacity C1 and operational amplifier U1A with circuit；One end of electric capacity C1 and input voltage signal Uin and operational amplifier U1A
No. 3 pin serial connections connection, the other end and the earth terminal of electric capacity C1 are connected in series；No. 2 pins of operational amplifier U1 and output
No. 1 pin serial connection connection of the operational amplifier U1A of analog signal voltage U1, No. 8 pins and the electricity of operational amplifier U1
Pressure follows the positive supply of circuit to be connected in series, and No. 4 pins are connected in series with the negative supply of the voltage follower circuit.
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| CN201710132421.3A CN106774029A (en) | 2017-03-07 | 2017-03-07 | High-precision analog signal isolation conversion output system |
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| CN107272489A (en) * | 2017-06-29 | 2017-10-20 | 山东省科学院激光研究所 | Signal pickup assembly, method and system |
| CN109211400A (en) * | 2018-11-07 | 2019-01-15 | 福州鑫奥特纳科技有限公司 | A kind of vibration of elevator data acquisition circuit that analog and digital signal is isolated entirely |
| CN110601688A (en) * | 2019-10-09 | 2019-12-20 | 赵明 | Matrix type multifunctional signal isolation transmitter |
| CN111490772A (en) * | 2020-04-27 | 2020-08-04 | 云南拓普特种电源科技有限公司 | High-speed isolated acquisition and restoration system and time sequence control method |
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