CN106706993A - Optocoupler current detection circuit - Google Patents
Optocoupler current detection circuit Download PDFInfo
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- CN106706993A CN106706993A CN201710051109.1A CN201710051109A CN106706993A CN 106706993 A CN106706993 A CN 106706993A CN 201710051109 A CN201710051109 A CN 201710051109A CN 106706993 A CN106706993 A CN 106706993A
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- China
- Prior art keywords
- optocoupler
- operational amplifier
- current detection
- input
- detection circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
Abstract
The present invention discloses an optocoupler current detection circuit. The optocoupler current detection circuit comprises a current detection unit, an optocoupler negative feedback unit and a reverse amplification unit; the input end of the current detection unit is adopted as the input end of the optocoupler current detection circuit; the output end of the reverse amplification unit is adopted as the output end of the optocoupler current detection circuit; and the current detection unit, the optocoupler negative feedback unit and the reverse amplification unit are connected with one another sequentially. According to the optocoupler current detection circuit provided by the technical schemes of the invention, an optocoupler is adopted in the current detection unit, so that the application of a high-resistance resistor is avoided, and therefore, the accuracy of the detection of the circuit will not be affected by the instability of the high-resistance resistor when the circuit is used under high-temperature high-humidity harsh environments; and an optocoupler can be adopted to constitute the negative feedback circuit so as to play the role of automatic adjustment, and detection results can be stable and balanced.
Description
Technical field
The present invention relates to current detecting field, more particularly to a kind of optocoupler current detection circuit.
Background technology
Generally need to detect the output current size of high voltage power supply in the both laser printer systems come required for adjusting it
Analog signal.Because being that output current in high-tension circuit is detected, if using differential electrical current detection circuit, then poor
The positive and reversed-phase output of point operational amplifier are not fee from can limit its positive and anti-phase using the resistance to high value
The input current of output end obtains less output voltage signal simultaneously, circuit be linked into the voltage of test point it is higher required for
Resistance is bigger.But the resistance of high value is under hot and humid environment, after the time is long, resistance can change.
If positive anti-phase resistance temperature characterisitic is inconsistent, when intensity of variation is different, it will cause its analog signal result for detecting to be sent out
Changing, this is likely to make printer misoperation；And this change is also irreversible, that is to say, that work as high resistance measurement
After changing, it is transferred in the environment of ambient temperature and moisture from hot and humid environment, the resistance after change is not returned to yet
Original resistance.There is change in resistance because of the ambient influnence that technological reason is particularly easy to by hot humid in high resistance measurement.
It is as shown in Figure 1 traditional current detection circuit schematic diagram, is sampled by sampling resistor R1, R2, R3 and R4
In input to operational amplifier, because the voltage at current detecting is negative high voltage signal -1350V, while in operational amplifier
Normal phase input end has accessed the bias voltage of+0.39V, therefore the value of sampling resistor R1, R2, R3 and R4 needs very greatly, otherwise electricity
Road cannot normal work, and the value of negative high voltage signal is bigger, and corresponding sampling resistor R1, R2, R3 and R4 also will be corresponding to increases.
But because the resistance of high value, worked long hours in power supply and when under hot and humid environment, the resistance of high resistance measurement is because of work
The reason for skill, stability was poor in the presence of a harsh environment, if the amplitude of the amplitude of variation of sampling resistor R1 and R2 and sampling resistor R3 and R4
When inconsistent, also easily drifted about on the basis of original in the voltage of the testing result Vout of operational amplifier output.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of optocoupler current detection circuit.
The purpose of the present invention is achieved through the following technical solutions：
A kind of optocoupler current detection circuit, including：Current detecting unit, optocoupler negative-feedback unit and anti-phase amplifying unit,
Wherein, the input of the current detecting unit as the optocoupler current detection circuit input, it is described reverse to amplify single
Unit output end as the optocoupler current detection circuit output end；
The current detecting unit, the optocoupler negative-feedback unit and the anti-phase amplifying unit are sequentially connected.
Wherein in one embodiment, the current detecting unit includes：First photoelectrical coupler ISO1, the first diode
D1, first resistor R1, the first sampling resistor R2 and the second sampling resistor R3, wherein, the hair of the first photoelectrical coupler ISO1
The anode of optical diode as the current detecting unit input, one end of the first sampling resistor R2 is used as the electricity
Flow detection unit the first output end, the second sampling resistor R3 as the current detecting unit the second output end；
The negative electrode of the light emitting diode of the first photoelectrical coupler ISO1 is connected with one end of the first resistor R1；
The first diode D1 is connected anti-parallel to the light emitting diode of the first photoelectrical coupler ISO1；
The colelctor electrode connection power Vcc of the phototriode of the first photoelectrical coupler ISO1, emitter stage is connected to institute
State one end of the first sampling resistor R2；
The other end of the first sampling resistor R2 is connected to reference ground GND；
One end of the second sampling resistor R3 is connected to reference ground GND.
Wherein in one embodiment, the current detecting unit also includes：First electric capacity C1, the first electric capacity C1's
One end is connected to the negative electrode of the first diode D1, and the other end is connected to one end of the first resistor R1.
Wherein in one embodiment, the current detecting unit also includes：Second electric capacity C2, the second electric capacity C2 is simultaneously
It is coupled to the first sampling resistor R2.
Wherein in one embodiment, the optocoupler negative-feedback unit includes：First operational amplifier U1A and the second photoelectricity
Coupler ISO2, wherein, the normal phase input end of the first operational amplifier U1A is used as the first of the optocoupler negative-feedback unit
Input, inverting input as the optocoupler negative-feedback unit the second input, the second photoelectrical coupler ISO2's
The negative electrode of light emitting diode as the optocoupler negative-feedback unit output end；
The normal phase input end of the first operational amplifier U1A is connected to one end of the first sampling resistor R2,
Inverting input is connected to one end of the second sampling resistor R3；
The output end of the first operational amplifier U1A is connected to the light emitting diode of the second photoelectrical coupler ISO2
Anode；
The power end of first operational amplifier is connected to power Vcc, and earth terminal is connected to reference ground GND；
The colelctor electrode of the phototriode of the second photoelectrical coupler ISO2 is connected to power Vcc, and emitter stage is connected to
The inverting input of the first operational amplifier U1A.
Wherein in one embodiment, the optocoupler negative-feedback unit also includes：3rd electric capacity C3, the 3rd electric capacity C3
One end be connected to the inverting input of the first operational amplifier U1A, the other end is connected to first operational amplifier
Output end.
Wherein in one embodiment, the optocoupler negative-feedback unit also includes：4th electric capacity C4, the 4th electric capacity C4
One end be connected to the power end of the first operational amplifier U1A, the other end is connected to reference ground GND.
Wherein in one embodiment, the anti-phase amplifying unit includes：4th resistance R4, the 5th resistance R5, the 6th electricity
Resistance R6 and the second operational amplifier U1B, wherein, one end of the 4th resistance R4 is first defeated as the anti-phase amplifying unit
Enter end, one end of the 5th resistance R5 as the anti-phase amplifying unit the second input, second operational amplifier
The output end of U1B as the anti-phase amplifying unit output end；
One end of the 4th resistance R4 is connected to the negative electrode of the light emitting diode of the second photoelectrical coupler ISO2, separately
One end is connected to the inverting input of the second operational amplifier U1B；
One end of the 5th resistance R5 is connected to bias supply, and the other end is connected to the second operational amplifier U1B
Anode input；
One end of the 6th resistance R6 is connected to the inverting input of the second operational amplifier U1B, and the other end connects
It is connected to the output end of the second operational amplifier U1B.
The technical scheme of this application has following beneficial effect compared to prior art：
1. the use of high resistance measurement is avoided, and the easy control of precision, testing result is accurate, in hot humid environment temperature
Stability inferior is stronger, and circuit is relatively reliable.
2. negative-feedback circuit is constituted with photoelectric coupled device, can be good at keeping the stabilization of detection voltage, while right
Influence of the wet environment to photoelectric coupled device also very little.
Brief description of the drawings
Fig. 1 is that conventional current detects circuit theory diagrams；
Fig. 2 is the optocoupler current detection circuit frame diagram in the present embodiment；
Fig. 3 is the optocoupler current detection circuit schematic diagram in the present embodiment.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give better embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to herein
Described implementation method.On the contrary, the purpose for providing these implementation methods is to make to understand more the disclosure
Plus it is thorough comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left side ",
For illustrative purposes only, it is unique implementation method to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all of combination of related Listed Items.
A kind of optocoupler current detection circuit is illustrated in figure 2, reference picture 3 is please combined in the lump, including：Current detecting unit
100th, optocoupler negative-feedback unit 200 and anti-phase amplifying unit 300, wherein, the input of the current detecting unit 100 is used as institute
The input of optocoupler current detection circuit is stated, the output end of the reverse amplifying unit 300 is used as optocoupler current detecting electricity
The output end on road；
The current detecting unit 100, the optocoupler negative-feedback unit 200 and the anti-phase amplifying unit 300 connect successively
Connect.
It should be noted that negative high voltage input on the basis of negative high voltage input, sensed current is from current detecting unit
Input input, there is provided detection signal.
Also, it should be noted that current detecting unit 100 is also attached to the A end points in high-voltage output end, i.e. Fig. 2.
Specifically, the current detecting unit 100 includes：First photoelectrical coupler ISO1, the first diode D1, the first electricity
Resistance R1, the first sampling resistor R2 and the second sampling resistor R3, wherein, the light emitting diode of the first photoelectrical coupler ISO1
Anode as the current detecting unit 100 input, one end of the first sampling resistor R2 is used as the current detecting
First output end of unit 100, the second sampling resistor R3 as the current detecting unit 100 the second output end；
The negative electrode of the light emitting diode of the first photoelectrical coupler ISO1 is connected with one end of the first resistor R1；
The first diode D1 is connected anti-parallel to the light emitting diode of the first photoelectrical coupler ISO1；
The colelctor electrode connection power Vcc of the phototriode of the first photoelectrical coupler ISO1, emitter stage is connected to institute
State one end of the first sampling resistor R2；
The other end of the first sampling resistor R2 is connected to reference ground GND；
One end of the second sampling resistor R3 is connected to reference ground GND.
It should be noted that the presence of the first diode D1 is the first photoelectrical coupler ISO1 of protection.
Also, it should be noted that first resistor R1 is divider resistance, the light-emitting diodes of the first photoelectrical coupler ISO1 are prevented
Pipe protects light emitting diode because of the excessive damage of voltage.
Further, the current detecting unit 100 also includes：One end of first electric capacity C1, the first electric capacity C1 connects
The negative electrode of the first diode D1 is connected to, the other end is connected to one end of the first resistor R1.
Further, the current detecting unit 100 also includes：Second electric capacity C2, the second electric capacity C2 is parallel to institute
State the first sampling resistor R2.
It should be noted that the first electric capacity C1 and the second electric capacity C2 is filter capacitor, noise jamming is eliminated.
Specifically, the optocoupler negative-feedback unit 200 includes：First operational amplifier U1A and the second photoelectrical coupler
ISO2, wherein, the normal phase input end of the first operational amplifier U1A is first defeated as the optocoupler negative-feedback unit 200
Enter end, inverting input as the optocoupler negative-feedback unit 200 the second input, the second photoelectrical coupler ISO2's
The negative electrode of light emitting diode as the optocoupler negative-feedback unit 200 output end；
The normal phase input end of the first operational amplifier U1A is connected to one end of the first sampling resistor R2,
Inverting input is connected to one end of the second sampling resistor R3；
The output end of the first operational amplifier U1A is connected to the light emitting diode of the second photoelectrical coupler ISO2
Anode；
The power end of first operational amplifier is connected to power Vcc, and earth terminal is connected to reference ground GND；
The colelctor electrode of the phototriode of the second photoelectrical coupler ISO2 is connected to power Vcc, and emitter stage is connected to
The inverting input of the first operational amplifier U1A.
It should be noted that the emitter stage of the phototriode of the second photoelectrical coupler ISO2 is connected to the first operation amplifier
The inverting input of device U1A, plays a part of Current Negative Three-Point Capacitance, and a pressure drop can be produced in the second sampling resistor R3, by negative
The effect of feedback so that the voltage of the first operational amplifier U1A output ends can follow the voltage of normal phase input end, plays automatic tune
Whole effect, so as to pin down the voltage change of output end so that output end voltage stabilization.
Further, the optocoupler negative-feedback unit 200 also includes：3rd electric capacity C3, one end of the 3rd electric capacity C3
The inverting input of the first operational amplifier U1A is connected to, the other end is connected to the output of first operational amplifier
End.
Further, the optocoupler negative-feedback unit 200 also includes：4th electric capacity C4, one end of the 4th electric capacity C4
The power end of the first operational amplifier U1A is connected to, the other end is connected to reference ground GND.
It should be noted that the 3rd electric capacity C3 is the effect of profound and negative feedbck and energy stabilizing circuit output characteristics, the 4th electricity
Appearance C4 is filter action.
Also, it should be noted that power Vcc is 25V power supplys.
Specifically, the anti-phase amplifying unit 300 includes：4th resistance R4, the 5th resistance R5, the 6th resistance R6 and second
Operational amplifier U1B, wherein, one end of the 4th resistance R4 as the anti-phase amplifying unit 300 first input end, institute
One end of the 5th resistance R5 is stated as the second input of the anti-phase amplifying unit 300, the second operational amplifier U1B's
Output end as the anti-phase amplifying unit 300 output end；
One end of the 4th resistance R4 is connected to the negative electrode of the light emitting diode of the second photoelectrical coupler ISO2, separately
One end is connected to the inverting input of the second operational amplifier U1B；
One end of the 5th resistance R5 is connected to bias supply, and the other end is connected to the second operational amplifier U1B
Anode input；
One end of the 6th resistance R6 is connected to the inverting input of the second operational amplifier U1B, and the other end connects
It is connected to the output end of the second operational amplifier U1B.
It should be noted that bias supply is 0.39V power supplys, for the second operational amplifier U1B provides bias voltage.
Also, it should be noted that the first photoelectrical coupler ISO1 and the second photoelectrical coupler in optocoupler current detection circuit
ISO2 should be close to each other as far as possible in layout so that the first photoelectrical coupler ISO1 and the second photoelectrical coupler ISO2 are in height
The environment temperature that can be consistent in the environment of warm high humidity, it is ensured that the first photoelectrical coupler ISO1 and the second photoelectrical coupler
ISO2 characteristically occurs without obvious difference, and along with the effect due to negative-feedback, the testing result of output can keep steady
Weighing apparatus is allocated, the stability and reliability of circuit is improved.
The above implementation method only expresses several embodiments of the invention, and its description is more specific and detailed, but
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of optocoupler current detection circuit, it is characterised in that including：Current detecting unit, optocoupler negative-feedback unit and anti-phase
Amplifying unit, wherein, the input of the current detecting unit as the optocoupler current detection circuit input, it is described anti-
To amplifying unit output end as the optocoupler current detection circuit output end；
The current detecting unit, the optocoupler negative-feedback unit and the anti-phase amplifying unit are sequentially connected.
2. optocoupler current detection circuit according to claim 1, it is characterised in that the current detecting unit includes：The
One photoelectrical coupler ISO1, the first diode D1, first resistor R1, the first sampling resistor R2 and the second sampling resistor R3, wherein,
The anode of the light emitting diode of the first photoelectrical coupler ISO1 as the current detecting unit input, described first
One end of sampling resistor R2 as the current detecting unit the first output end, the second sampling resistor R3 is used as the electricity
Flow the second output end of detection unit；
The negative electrode of the light emitting diode of the first photoelectrical coupler ISO1 is connected with one end of the first resistor R1；
The first diode D1 is connected anti-parallel to the light emitting diode of the first photoelectrical coupler ISO1；
The colelctor electrode connection power Vcc of the phototriode of the first photoelectrical coupler ISO1, emitter stage is connected to described the
One end of one sampling resistor R2；
The other end of the first sampling resistor R2 is connected to reference ground GND；
One end of the second sampling resistor R3 is connected to reference ground GND.
3. optocoupler current detection circuit according to claim 2, it is characterised in that the current detecting unit also includes：
First electric capacity C1, one end of the first electric capacity C1 is connected to the negative electrode of the first diode D1, and the other end is connected to described
One end of first resistor R1.
4. optocoupler current detection circuit according to claim 3, it is characterised in that the current detecting unit also includes：
Second electric capacity C2, the second electric capacity C2 is parallel to the first sampling resistor R2.
5. optocoupler current detection circuit according to claim 4, it is characterised in that the optocoupler negative-feedback unit includes：
First operational amplifier U1A and the second photoelectrical coupler ISO2, wherein, the normal phase input end of the first operational amplifier U1A
Used as the first input end of the optocoupler negative-feedback unit, inverting input is input into as the second of the optocoupler negative-feedback unit
End, the negative electrode of the light emitting diode of the second photoelectrical coupler ISO2 as the optocoupler negative-feedback unit output end；
The normal phase input end of the first operational amplifier U1A is connected to one end of the first sampling resistor R2, anti-phase
Input is connected to one end of the second sampling resistor R3；
The output end of the first operational amplifier U1A is connected to the sun of the light emitting diode of the second photoelectrical coupler ISO2
Pole；
The power end of first operational amplifier is connected to power Vcc, and earth terminal is connected to reference ground GND；
The colelctor electrode of the phototriode of the second photoelectrical coupler ISO2 is connected to power Vcc, and emitter stage is connected to described
The inverting input of the first operational amplifier U1A.
6. optocoupler current detection circuit according to claim 5, it is characterised in that the optocoupler negative-feedback unit is also wrapped
Include：3rd electric capacity C3, one end of the 3rd electric capacity C3 is connected to the inverting input of the first operational amplifier U1A, separately
One end is connected to the output end of first operational amplifier.
7. optocoupler current detection circuit according to claim 6, it is characterised in that the optocoupler negative-feedback unit is also wrapped
Include：4th electric capacity C4, one end of the 4th electric capacity C4 is connected to the power end of the first operational amplifier U1A, the other end
It is connected to reference ground GND.
8. optocoupler current detection circuit according to claim 7, it is characterised in that the anti-phase amplifying unit includes：The
Four resistance R4, the 5th resistance R5, the 6th resistance R6 and the second operational amplifier U1B, wherein, one end of the 4th resistance R4 is made
It is the first input end of the anti-phase amplifying unit, one end of the 5th resistance R5 is used as the second of the anti-phase amplifying unit
Input, the output end of the second operational amplifier U1B as the anti-phase amplifying unit output end；
One end of the 4th resistance R4 is connected to the negative electrode of the light emitting diode of the second photoelectrical coupler ISO2, the other end
It is connected to the inverting input of the second operational amplifier U1B；
One end of the 5th resistance R5 is connected to bias supply, and the other end is being connected to the second operational amplifier U1B just
End input；
One end of the 6th resistance R6 is connected to the inverting input of the second operational amplifier U1B, and the other end is connected to
The output end of the second operational amplifier U1B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710051109.1A CN106706993B (en) | 2017-01-23 | 2017-01-23 | Optocoupler current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710051109.1A CN106706993B (en) | 2017-01-23 | 2017-01-23 | Optocoupler current detection circuit |
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| Publication Number | Publication Date |
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| CN106706993A true CN106706993A (en) | 2017-05-24 |
| CN106706993B CN106706993B (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710051109.1A Active CN106706993B (en) | 2017-01-23 | 2017-01-23 | Optocoupler current detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152557A (en) * | 2017-12-26 | 2018-06-12 | 常州三立精图光电有限公司 | Sample circuit is isolated in a kind of feedback current |
| CN110967540A (en) * | 2019-12-12 | 2020-04-07 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
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| US5517154A (en) * | 1995-01-13 | 1996-05-14 | Tektronix, Inc. | Split-path linear isolation circuit apparatus and method |
| CN101923111A (en) * | 2009-06-11 | 2010-12-22 | 北京中纺锐力机电有限公司 | Isolation detection circuit of DC bus voltage |
| CN202757980U (en) * | 2012-08-27 | 2013-02-27 | 无锡安邦电气有限公司 | Analog signal isolation detection circuit |
| CN203561672U (en) * | 2013-10-23 | 2014-04-23 | 珠海思创电气有限公司 | A cell voltage sampling circuit used for microcomputer protection |
| CN206594217U (en) * | 2017-01-23 | 2017-10-27 | 惠州三华工业有限公司 | A kind of optocoupler current detection circuit |
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2017
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517154A (en) * | 1995-01-13 | 1996-05-14 | Tektronix, Inc. | Split-path linear isolation circuit apparatus and method |
| CN101923111A (en) * | 2009-06-11 | 2010-12-22 | 北京中纺锐力机电有限公司 | Isolation detection circuit of DC bus voltage |
| CN202757980U (en) * | 2012-08-27 | 2013-02-27 | 无锡安邦电气有限公司 | Analog signal isolation detection circuit |
| CN203561672U (en) * | 2013-10-23 | 2014-04-23 | 珠海思创电气有限公司 | A cell voltage sampling circuit used for microcomputer protection |
| CN206594217U (en) * | 2017-01-23 | 2017-10-27 | 惠州三华工业有限公司 | A kind of optocoupler current detection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152557A (en) * | 2017-12-26 | 2018-06-12 | 常州三立精图光电有限公司 | Sample circuit is isolated in a kind of feedback current |
| CN110967540A (en) * | 2019-12-12 | 2020-04-07 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
| CN110967540B (en) * | 2019-12-12 | 2022-03-25 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
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| Publication number | Publication date |
|---|---|
| CN106706993B (en) | 2023-06-13 |
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