CN207703924U - A kind of low cost DC voltage isolation picking circuit - Google Patents
A kind of low cost DC voltage isolation picking circuit Download PDFInfo
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- CN207703924U CN207703924U CN201721486951.XU CN201721486951U CN207703924U CN 207703924 U CN207703924 U CN 207703924U CN 201721486951 U CN201721486951 U CN 201721486951U CN 207703924 U CN207703924 U CN 207703924U
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Abstract
The utility model discloses and provides a kind of low cost DC voltage isolation picking circuit, it includes DC voltage importation, resistance mode is depressured part, isolation output feedback circuit, amplifier Differential input circuit, isolation voltage direct current output part, resistance mode decompression part carries out the output end voltage of DC voltage importation the input terminal of input isolation output feedback circuit after decompression pressure limiting, the output end of isolation output feedback circuit is divided into isolation output and feedback signal two parts are connected with amplifier Differential input circuit and isolation voltage direct current output part, DC isolation voltage is exported by isolation voltage direct current output part.Due to using common double photoelectric isolating circuits and operational amplifier circuit, introducing corresponding feedback circuit, realizes DC voltage isolation, acquisition function, input all the way, in addition do and feed back all the way, export corresponding isolated DC voltage.So having the advantages that at low cost and circuit is simple.
Description
Technical field
The utility model is related to DC voltage Acquisition Circuit more particularly to a kind of low cost DC voltage isolation picking electricity
Road.
Background technology
DC voltage isolation Acquisition Circuit mainly has the following two kinds at present：(1）Linear optical coupling adds isolation DC-DC power source, this
Scheme is by linear optical coupling isolation, transmission of analogue signal, and the DC-DC of isolation provides isolated from power for linear optical coupling；(2）By
The DC-DC power source of ADC special chips, signal, isolated from power composition, this scheme are to acquire simulation letter by dedicated ADC chips
Number, corresponding analog voltage is being exported by digital isolating chip and power supply.The above two direct current being widely used at present
Pressure isolation Acquisition Circuit, the former adds isolated power supply mode by linear optical coupling, and the latter is using ADC special chips, signal, isolation electricity
There is of high cost, the defect of circuit complexity in source mode, the two.
Utility model content
Technical problem to be solved in the utility model is overcome the deficiencies in the prior art, provides a kind of at low cost, circuit
Acquisition Circuit is isolated in simple DC voltage.
Technical solution used by the utility model is：A kind of low cost DC voltage isolation picking circuit, it includes straight
Voltage input section, resistance mode decompression part, isolation voltage direct current output part are flowed, it further includes isolation output feedback electricity
Road, amplifier Differential input circuit, the DC voltage importation, resistance mode decompression part, isolation output feedback circuit, fortune
Put Differential input circuit, isolation voltage direct current output part is sequentially connected electrically, the input terminal company of the DC voltage importation
Different grades of DC voltage is connect, the output end of the DC voltage importation connects the resistance mode and is depressured part, institute
State resistance mode decompression part to the output end voltage of the DC voltage importation input after decompression pressure limiting it is described every
The output end of input terminal from output feedback circuit, the isolation output feedback circuit is divided into isolation output and feedback signal two
Divide and is connected with the amplifier Differential input circuit and isolation voltage direct current output part, it is defeated by the isolation voltage direct current
Go out part output DC isolation voltage.
The resistance mode decompression portion point includes the 6th resistance, the 7th resistance, and the 6th resistance, the series connection of the 7th resistance connect
It connects, the other end of the 6th resistance connects the output end of the DC voltage importation, and the 7th resistance other end connects
Connect this circuit isolation ground terminal, the 6th resistance and the 7th resistance series connection tie point connect it is described be isolated export the defeated of feedback circuit
Enter end.
The isolation output feedback circuit includes first resistor, 3rd resistor, the 4th resistance, double photoelectric isolating circuits, institute
The one end for stating first resistor is connect with the resistance mode decompression portion split-phase, and the other end of the first resistor connects double light
2nd foot of the 1st foot of electric isolating circuit, double photoelectric isolating circuits connects one end of the 3rd resistor, the third electricity
The other end of resistance connects described circuit isolation ground terminal, and the 3rd resistor is resistance value adjustable resistance, double Phototube Coupling electricity
3rd foot on road is connect with the input terminal of isolation voltage direct current output part, the 4th foot connection of double photoelectric isolating circuits
The other end of one end of the 4th resistance, the 4th resistance connects circuit altogether, the 6th foot of double photoelectric isolating circuits
Power vd D, the 5th foot and the 7th foot and the amplifier Differential input circuit of double photoelectric isolating circuits are connected with the 8th foot
Input terminal corresponding points are correspondingly connected with.
The amplifier Differential input circuit include operational amplifier circuit, second resistance, the 5th resistance, the first capacitance, the second capacitance,
Third is held, and the 3rd foot of the operational amplifier circuit connects one end of second capacitance, one end of the second resistance, double light
7th foot of electric isolating circuit, the 2nd foot of the operational amplifier circuit connect one end of the third capacitance, the 5th resistance one
It holds, one end of the 5th foot of double photoelectric isolating circuits, first capacitance, the second resistance, the 5th resistance, the second electricity
Altogether, the 1st foot of the operational amplifier circuit connects the other end of first capacitance, institute to the other end connection circuit that appearance, third are held
The input terminal of isolation voltage direct current output part is stated, the anode of the operational amplifier circuit connects power vd D, the operational amplifier circuit
Negative terminal connects circuit altogether.
The utility model has the beneficial effects that：The utility model it include DC voltage importation, resistance mode decompression
Partly, isolation voltage direct current output part, it further includes isolation output feedback circuit, amplifier Differential input circuit, the direct current
Voltage input section, resistance mode decompression part, isolation output feedback circuit, amplifier Differential input circuit, isolation voltage direct current
Output par, c is sequentially connected electrically, and the input terminal of the DC voltage importation connects different grades of DC voltage, described straight
The output end for flowing voltage input section connects resistance mode decompression part, and resistance mode decompression part is to the direct current
The output end voltage of voltage input section input after decompression pressure limiting the input terminal of the isolation output feedback circuit, it is described every
Output end from output feedback circuit is divided into isolation output and feedback signal two parts and the amplifier Differential input circuit and institute
It states isolation voltage direct current output part to be connected, DC isolation voltage is exported by isolation voltage direct current output part.Due to
The utility model introduces corresponding feedback circuit using common double photoelectric isolating circuits and operational amplifier circuit, realize DC voltage every
From, acquisition function, input all the way, in addition do and feed back all the way, export corresponding isolated DC voltage.So at low cost and
The simple advantage of circuit.
Description of the drawings
Fig. 1 is the utility model circuit theory schematic diagram.
Specific implementation mode
As shown in Figure 1, the utility model it include a kind of low cost DC voltage isolation picking circuit, it includes direct current
Importation 1, resistance mode decompression part 2, isolation voltage direct current output part 5 are pressed, it further includes isolation output feedback circuit
3, amplifier Differential input circuit 4, the DC voltage importation 1, resistance mode decompression part 2, isolation output feedback circuit
3, amplifier Differential input circuit 4, isolation voltage direct current output part 5 are sequentially connected electrically, the DC voltage importation 1 it is defeated
Enter end and connect different grades of DC voltage, the output end of the DC voltage importation 1 connects the resistance mode decompression
Part 2, after resistance mode decompression part 2 carries out decompression pressure limiting to the output end voltage of the DC voltage importation 1
Input it is described isolation output feedback circuit 3 input terminal, it is described isolation output feedback circuit 3 output end be divided into isolation output and
Feedback signal two parts are connected with the amplifier Differential input circuit 4 and isolation voltage direct current output part 5, by described
Isolation voltage direct current output part 5 exports DC isolation voltage.
Resistance mode decompression part 2 includes the 6th resistance R6, the 7th resistance R7, the 6th resistance R6, the 7th electricity
Resistance R7 is connected in series with, and the other end of the 6th resistance R6 connects the output end of the DC voltage importation 1, and the described 7th
The resistance R7 other ends connect this circuit isolation ground terminal, the 6th resistance R6 and the 7th resistance R7 be connected in series with connect described in every
Input terminal from output feedback circuit 3.
The isolation output feedback circuit 3 includes first resistor R1,3rd resistor R3, the 4th resistance R4, double Phototube Couplings
One end of circuit OC1, the first resistor R1 are connected with resistance mode decompression part 2, and the first resistor R1's is another
One end connects the 1st foot of double photoelectric isolating circuit OC1, and the 2nd foot of double photoelectric isolating circuit OC1 connects the third
The other end of one end of resistance R3, the 3rd resistor R3 connects described circuit isolation ground terminal, and the 3rd resistor R3 is resistance
It is worth adjustable resistance, the 3rd foot of double photoelectric isolating circuit OC1 connects with the input terminal of isolation voltage direct current output part 5
It connects, the 4th foot of double photoelectric isolating circuit OC1 connects one end of the 4th resistance R4, and the 4th resistance R4's is another
Altogether, the 6th foot of double photoelectric isolating circuit OC1 and the 8th foot connect power vd D, double Phototube Couplings to end connection circuit
The 5th foot of circuit OC1 and the input terminal corresponding points of the 7th foot and the amplifier Differential input circuit 4 are correspondingly connected with.
The amplifier Differential input circuit 4 includes operational amplifier circuit U1A, second resistance R2, the 5th resistance R5, the first capacitance
C1, the second capacitance C2, third hold C3, and the 3rd foot of the operational amplifier circuit U1A connects one end of the second capacitance C2, described the
One end of two resistance R2, double photoelectric isolating circuit OC1 the 7th foot, the 2nd foot connection described the of the operational amplifier circuit U1A
One end of three capacitance C3, one end of the 5th resistance R5, double photoelectric isolating circuit OC1 the 5th foot, first capacitance
One end of C1, the second resistance R2, the 5th resistance R5, the second capacitance C2, third hold the other end connection circuit of C3 altogether, institute
State operational amplifier circuit U1A the 1st foot connect the other end of the first capacitance C1, isolation voltage direct current output part 5 it is defeated
Enter end, the negative terminal connection circuit of anode connection the power vd D, the operational amplifier circuit U1A of the operational amplifier circuit U1A are altogether.
In the present embodiment, using common double photoelectric isolating circuits and operational amplifier circuit, corresponding feedback circuit is introduced, is realized straight
The isolation of galvanic electricity pressure, acquisition function, input, in addition do and feed back all the way, export corresponding isolated DC voltage all the way.So having
The at low cost and simple advantage of circuit.Extensive use can improve working efficiency and economic benefit.
Claims (4)
1. a kind of low cost DC voltage isolation picking circuit, it includes DC voltage importation（1）, resistance mode decompression portion
Point（2）, isolation voltage direct current output part（5）, it is characterised in that：It further includes isolation output feedback circuit（3）, amplifier difference
Input circuit（4）, the DC voltage importation（1）, resistance mode be depressured part（2）, isolation output feedback circuit（3）、
Amplifier Differential input circuit（4）, isolation voltage direct current output part（5）It is sequentially connected electrically, the DC voltage importation（1）
Input terminal connect different grades of DC voltage, the DC voltage importation（1）Output end connect the resistive square
Formula is depressured part（2）, resistance mode decompression part（2）To the DC voltage importation（1）Output end voltage into
The isolation output feedback circuit is inputted after row decompression pressure limiting（3）Input terminal, the isolation exports feedback circuit（3）Output
End is divided into isolation output and feedback signal two parts and the amplifier Differential input circuit（4）With the isolation voltage direct current output
Part（5）It is connected, by isolation voltage direct current output part（5）Export DC isolation voltage.
2. low cost DC voltage isolation picking circuit according to claim 1, it is characterised in that：The resistance mode drop
Laminate section（2）Including the 6th resistance R6, the 7th resistance R7, the 6th resistance R6, the 7th resistance R7 are connected in series with, and the described 6th
The other end of resistance R6 connects the DC voltage importation（1）Output end, the 7th resistance R7 other ends connection this
Circuit is isolated ground terminal, the 6th resistance R6 and the 7th resistance R7 be connected in series with a connection it is described be isolated export feedback circuit（3）
Input terminal.
3. low cost DC voltage isolation picking circuit according to claim 2, it is characterised in that：The isolation output is anti-
Current feed circuit（3）Including first resistor R1,3rd resistor R3, the 4th resistance R4, double photoelectric isolating circuit OC1, the first resistor
One end of R1 is depressured part with the resistance mode（2）It is connected, the other end of the first resistor R1 connects double photoelectricity
2nd foot of the 1st foot of isolation circuit OC1, double photoelectric isolating circuit OC1 connects one end of the 3rd resistor R3, described
The other end of 3rd resistor R3 connects described circuit isolation ground terminal, and the 3rd resistor R3 is resistance value adjustable resistance, described double
The 3rd foot of photoelectric isolating circuit OC1 and isolation voltage direct current output part（5）Input terminal connection, double photoelectricity every
From one end that the 4th foot of circuit OC1 connects the 4th resistance R4, the other end of the 4th resistance R4 connects circuit altogether,
The 6th foot of double photoelectric isolating circuit OC1 and the 8th foot connect power vd D, the 5th foot of double photoelectric isolating circuit OC1
With the 7th foot and the amplifier Differential input circuit（4）Input terminal corresponding points be correspondingly connected with.
4. low cost DC voltage isolation picking circuit according to claim 3, it is characterised in that：The amplifier difference is defeated
Enter circuit（4）Including operational amplifier circuit U1A, second resistance R2, the 5th resistance R5, the first capacitance C1, the second capacitance C2, third capacitance
The 3rd foot of C3, the operational amplifier circuit U1A connect one end of the second capacitance C2, the second resistance R2 one end, described double
2nd foot of the 7th foot of photoelectric isolating circuit OC1, the operational amplifier circuit U1A connects one end of the third capacitance C3, described
One end of five resistance R5, the 5th foot of double photoelectric isolating circuit OC1, the first capacitance C1 one end, the second resistance
R2, the 5th resistance R5, the second capacitance C2, third capacitance C3 the other end connection circuit altogether, the 1st of the operational amplifier circuit U1A the
Foot connects the other end of the first capacitance C1, isolation voltage direct current output part（5）Input terminal, the operational amplifier circuit
The negative terminal connection circuit of anode connection the power vd D, the operational amplifier circuit U1A of U1A are altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721486951.XU CN207703924U (en) | 2017-11-09 | 2017-11-09 | A kind of low cost DC voltage isolation picking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721486951.XU CN207703924U (en) | 2017-11-09 | 2017-11-09 | A kind of low cost DC voltage isolation picking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207703924U true CN207703924U (en) | 2018-08-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721486951.XU Expired - Fee Related CN207703924U (en) | 2017-11-09 | 2017-11-09 | A kind of low cost DC voltage isolation picking circuit |
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| CN (1) | CN207703924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
-
2017
- 2017-11-09 CN CN201721486951.XU patent/CN207703924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 Termination date: 20211109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |