CN101034492A - Photoisolator and manufacturing method thereof - Google Patents
Photoisolator and manufacturing method thereof Download PDFInfo
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- CN101034492A CN101034492A CN 200610056924 CN200610056924A CN101034492A CN 101034492 A CN101034492 A CN 101034492A CN 200610056924 CN200610056924 CN 200610056924 CN 200610056924 A CN200610056924 A CN 200610056924A CN 101034492 A CN101034492 A CN 101034492A
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Abstract
The invention relates to a photoelectricity disconnector which is composed by non-linear input unit, comparison adjustment unit, the linearity output unit, among, in relative to the input end of linearity output unit and between output port Uout which is in question, the comparison adjustment unit multiple connected with the linearity output unit in question; In relative to the linearity output unit another input end in question, the non-linear input unit accompany with input port Uin series connected with the linearity output unit which is in question. In this installment, the photoelectricity isolation component in the comparison adjustment unit is a mirror image of photoelectricity isolation component in the input unit which is in question, and, primarily states of disconnector may not to use the sur-power source; it is extremely loose to the sublevel electric power supply target request; This photoelectricity disconnector structure is simple, the volume is small, is suitable for the many kinds of situations use.
Description
Technical field
The present invention relates to a kind of isolated amplifier that is used for simulating signal is isolated transmission, specifically a kind of photoisolator and preparation method thereof.
Background technology
The isolation of analog electrical signal be transmitted in the engineering use very general.Use isolating device to be generally mutual inductor, Hall type sensor, transformer coupled type isolated amplifier, capacitor type isolated amplifier, photoelectric coupling type isolator etc. at present.Existing isolated amplifier has possessed high linearity and stability indicator, and the photoisolator electrical separation is good, life-span length, bandwidth, reliable operation etc., is subjected to everybody welcome.But the high volume of product price is big, has restricted its application in many instances.Especially problem is more outstanding when many signals and general general device are used.Do with common optocoupler pipe that the light-coupled isolation circuit is simple, price is very cheap.For a long time, many technician do one's utmost at circuit or calculate enterprising line linearity effort, owing to the not only linear difference of optocoupler itself but also to the very responsive problem that is difficult to resolve in the engineering reality of environment temperature.This and also reflected a kind of circumstances in the actual engineering.In addition, a class problem that runs in the engineering is also a lot: the simulating signal quantity that transmit is a lot of and each signal is in different reference potentials or system, will provide numerous independently insulating power supplies this moment, realize that this kind requirement is very difficult.Typical example such as battery cell are patrolled and examined, the battery pack role is extremely important, and the appearance of a large amount of monograph articles, a large amount of battery detection equipment producer illustrates that the necessity of the monitoring of battery more and more is much accounted of, therefore, the monitoring sampling device demand in order to battery is a lot.But consider to select for use isolating device to be difficult to take into account from volume, price, speed, performance and secure context.
Summary of the invention
Technical matters to be solved by this invention provides the preparation method of a kind of photoisolator and this isolator, be intended to realize solving the electric signal distortion that need isolate transmission little, control the temperature drift problem, can satisfy again that the low price of product own, volume are little, the purpose of good linearity, requirement that stability is high.
For this reason, the technical scheme that the present invention solves described problem is: a kind of photoisolator, constitute by the non-linear input block with buffer action, comparison adjustment unit, linearity output unit, wherein, between input end and output port Uout with respect to described linearity output unit, described relatively adjustment unit and described linearity output unit are connected in parallel; At another input end with respect to described linearity output unit, described non-linear input block and the described linearity output unit that has input port Uin is connected in series.And non-linear input block wherein is made of at least one the photoelectric coupled device V1 as input stage, input resistance R3, output resistance R1, and whole non-linear input block has buffer action in described photoisolator, and its output terminal is connected with the electrode input end of described linearity output unit; Comparison adjustment unit wherein is made of mirror image photoelectric isolating device V2 and input resistance R4, an output resistance R2 as described photoelectric coupled device V1, and between negative input and output terminal with respect to described linearity output unit, described relatively adjustment unit is connected with described linearity output unit parallel connection; Linearity output unit wherein is made of at least one operational amplifier V3.
For realizing the rational deployment of said structure, the present invention has provided the method step of making photoisolator further, have: a. selects a pair of its parameter, characteristic unanimity or close photoelectric coupled device V1, V2 with respect to non-linear input block, comparison adjustment unit; B. specifying described V1 is the isolating device of input stage, realizes the isolation of primary circuit and secondary circuit; C. specifying described V2 is the mirror image of described V1; D. with respect to linearity output unit, select for use operational amplifier V3 more than one or one and capacitor C 1 to make comparisons to amplify and use; E. optocoupler input resistance R3, the R4 and optocoupler output resistance R1, the R2 that select for use two resistances to equate respectively at the difference of optocoupler V1, V2, can suitably finely tune the resistance of one of them resistance; F. dispose an output circuit that can supply described photoisolator to select for use; G. dispose an input circuit that can supply described photoisolator to select for use; H. dispose an active combinational circuit that can supply described photoisolator to select for use; I. by step a. to step f. to step g. make an elementary passive photoisolator; J. make an elementary active photoisolator by step a. to h..
Compared to existing technology, outstanding substantive distinguishing features and significant technical progress that the present invention had can reflect from following good effect: the photoisolator that the present invention relates to is made up of three cell mesh, promptly non-linear input block, comparison adjustment unit, linearity output unit.Photoelectric isolating device in its non-linear input block has played the buffer action of this device, elementary as isolator, and it can be without additional power source; And V2 can be as the mirror image of V1, no matter and pilot process have great non-linear and can reach linear output; Secondary power supply magnitude of voltage changes in very wide scope, the technical indicator of isolator is almost constant, its meaning is to provide good basis for the technical indicator that promotes this device, also feasible very loose to the index request of secondary power supply, can be in circuit structure less to having only an operational amplifier; If then can strengthen or increase the function of this device when using a plurality of amplifier.Photoelectric isolating device can be operated in the inelastic region and working current is little, and power consumption is minimum.
Description of drawings
Fig. 1 is the cellular construction block diagram of the photoisolator that the present invention relates to;
Fig. 2 is the electrical block diagram about the embodiment of Fig. 1;
Fig. 3 is another electrical block diagram about Fig. 1;
Fig. 4 is about the elementary active electrical block diagram of having of Fig. 1;
Fig. 5 is the electrical block diagram about an embodiment of non-linear input block among Fig. 1;
Fig. 6 is the electrical block diagram about another embodiment of non-linear input block among Fig. 1;
Fig. 7 is the electrical block diagram about another embodiment of non-linear input block among Fig. 1;
Fig. 8 is a process flow diagram of making a photoisolator.
Embodiment
By Fig. 1 and in conjunction with Fig. 2 to Fig. 8, the present invention relates to a kind of photoisolator, this device is to be made of the non-linear input block with buffer action, comparison adjustment unit, linearity output unit, wherein, between input end and output port Uout with respect to described linearity output unit, described relatively adjustment unit and described linearity output unit are connected in parallel; At the input end with respect to described linearity output unit, described non-linear input block and the described linearity output unit that has input port Uin is connected in series.And, described non-linear input block is made of at least one the photoelectric isolating device V1 as input stage, input resistance R3, output resistance R1, and whole non-linear input block has buffer action in described device, and its output terminal is connected with the electrode input end of described linearity output unit.And described relatively adjustment unit is made of photoelectric isolating device V2 and input resistance R4, an output resistance R2 as described photoelectric isolating device V1 mirror image, and between negative input and output terminal with respect to described linearity output unit, described relatively adjustment unit is connected with described linearity output unit parallel connection.And described linearity output unit is made of at least one operational amplifier V3.Again referring to Fig. 3; described non-linear input block; be provided with one by diode D2, resistance R 5, to the former holding circuit that extremely constitutes of described photoelectric isolating device V1 at its input end; wherein; with respect to described input port Uin, described diode D2, resistance R 5, filter capacitor C2 are connected in parallel.Simultaneously, referring to Fig. 5, described non-linear input block extremely is provided with a voltage stabilizing biasing circuit that is made of resistance R 7, stabilivolt D3 its described photoelectric isolating device V1 former, and wherein, the positive terminal of described stabilivolt D3 is connected with described resistance 7.Simultaneously, referring to Fig. 6, described non-linear input block, extremely be provided with a voltage stabilizing biasing circuit that constitutes by resistance R 8, R9, stabilivolt D4 its described photoelectric isolating device V1 former, wherein, the positive terminal ground connection of described stabilivolt D4, the negative pole end of stabilivolt D4 is connected with branch pressure side between described resistance R 8, the R9.Simultaneously, referring to Fig. 7, described non-linear input block extremely is provided with a voltage follower or an amplifier that is made of operational amplifier V4 its described photoelectric isolating device V1 former, wherein, the output terminal of described operational amplifier V4 is connected with described input resistance R3.Simultaneously, referring to Fig. 4, described linear input block, a diode D1 in parallel between its output port Uout and its negative pole.
Based on the unitary construction of this device, the present invention's step as follows is prepared: a. selects a pair of its parameter, characteristic unanimity or close photoelectric coupled device V1, V2 with respect to non-linear input block, comparison adjustment unit; B. specifying described V1 is the isolating device of input stage, realizes the isolation of primary circuit and secondary circuit; C. specifying described V2 is the mirror image of described V1; D. with respect to linearity output unit, select for use operational amplifier V3 more than one or one and capacitor C 1 to make comparisons to amplify and use; E. optocoupler input resistance R3, the R4 and optocoupler output resistance R1, the R2 that select for use two resistances to equate respectively at the difference of optocoupler V1, V2, can suitably finely tune the resistance of one of them resistance; F. dispose an output circuit that can supply described photoisolator to select for use; G. dispose an input circuit that can supply described photoisolator to select for use; H. dispose an active combinational circuit that can supply described photoisolator to select for use; I. by step a. to step f. to step g. make an elementary passive photoisolator; J. make an elementary active photoisolator by step a. to h..
In more detail, the photoisolator that this case relates to (seeing Fig. 3 especially), its basic building block comprise optocoupler V1, optocoupler V2, amplifier V3, diode D1, diode D2 and resistance, electric capacity unit device.As the input resistance (when R5 does not insert) of two optocouplers, resistance R 1 and R2 are respectively the output resistances of two optocouplers respectively for resistance R 3 and R4.When these two input resistances equated, two output resistances also can equate.Optocoupler V1 is as the isolating device of non-linear input block, with its effect of optocoupler and residing situation in common circuit be duplicate.The characteristic of V2 and V1 is the same in this case, and particularly optocoupler V2 can regard the mirror image of optocoupler V1 as.When selecting the close a pair of optocoupler of parameter for use, the difference of optocoupler V2 and V1 optocoupler can be finely tuned compensation with resistance or variohm.And operational amplifier V3 is a comparison amplifier in this case.In practice, this photoisolator also can use a plurality of amplifiers to strengthen or to increase the function of this coupling mechanism.Under current intelligence, the input signal variation of photoisolator can make the output signal of V1 change, also make in the linearity output unit operational amplifier V3 its+,-change of input terminal voltage difference, make V3 output Uout take place to change greatly like this, relatively same the variation takes place in adjustment unit V2 input end, and then by coupling the V2 output voltage is changed, this will make V3+,-the input terminal voltage value equates.In other words, the output voltage values of promptly representing two optocouplers equates; Because V2 is the same with V1 optocoupler characteristic, two optocoupler input resistances and output resistance resistance are identical, so two optocoupler input voltage Uin, Uout necessarily also equate; That is to say that optocoupler output voltage U out equals V1 optocoupler input voltage Uin, so far, has realized the purpose of linear output.Optocoupler V1 has also realized the isolation of primary circuit and secondary circuit simultaneously, like this, no matter how big the pilot process of two-stage circuit produce and to have non-linearly, all can realize linear transfer to this device of output voltage signal.Because V1, V2 are in identical duty, power source change can be offset fully to the influence of V1, V2, when secondary power supply magnitude of voltage changes in very wide scope, and the technical indicator effect of this device " almost constant ".The effect of capacitor C 1 is to make amplifying circuit stable.The effect of diode D1 is too little and when being lower than the forward voltage (threshold voltage) of the primary diode of optocoupler V1 at input voltage Uin, the V1 output voltage is zero, because there is input offset voltage in operational amplifier V3, might high negative value occur at output terminal, this voltage is obviously unusual.Installation diode D1 will limit the minimum voltage output of Uout in the circuit, make its minimum voltage output near zero.In input circuit, resistance R 3 and diode D2 constitute the reverse-voltage protection circuit.Resistance R 3 and resistance R 5 dividing potential drops improve the input voltage amplitude with expansion maximum input voltage scope.Resistance R 3 and capacitor C 2 are formed filtering circuit to improve antijamming capability, and the effect of capacitor C 1 is to make the amplifying circuit working stability, also the high frequency interference in the filtering input signal.Fig. 5 in this case, Fig. 6 are the examples again of non-linear input block in the linear photoconductor isolator, also can be referred to as the active combinational circuit in the linear photoconductor isolator, the voltage stabilizing diode D3 among its figure, resistance R 7; Voltage stabilizing diode D4, resistance R 8, R9 are respectively the voltage stabilizing biasing circuit of optocoupler V1; Wherein, what use among Fig. 5 is negative supply, and what use among Fig. 6 is positive supply, and their effect is to make the input signal working range expand to zero or minus zone.And for example shown in Figure 7, at the input front end of non-linear input block a voltage follower or an amplifying circuit that is made of operational amplifier is set input impedance is improved, or expansion small-signal input voltage working range.
Because this device basic circuit is simple, it is little to take volume, and for combination of circuits is provided convenience, the while also can be used in combination with basic circuit commonly used, and this device is non-constant width pine to the index request of elementary power supply.
Claims (10)
1. photoisolator, it is characterized in that, described photoisolator, constitute by the non-linear input block with buffer action, comparison adjustment unit, linearity output unit, wherein, between input end and output port Uout with respect to described linearity output unit, described relatively adjustment unit and described linearity output unit are connected in parallel; At another input end with respect to described linearity output unit, described non-linear input block and the described linearity output unit that has input port Uin is connected in series.
2. photoisolator according to claim 1, it is characterized in that, described non-linear input block is made of at least one the photoelectric isolating device V1 as input stage, input resistance R3, output resistance R1, and whole non-linear input block has buffer action in described precision photoelectric coupler, and its output terminal is connected with the electrode input end of described linearity output unit.
3. photoisolator according to claim 1, it is characterized in that, described relatively adjustment unit is made of photoelectric isolating device V2 and input resistance R4, an output resistance R2 as described photoelectric isolating device V1 mirror image, and between negative input and output terminal with respect to described linearity output unit, described relatively adjustment unit is connected with described linearity output unit parallel connection.
4. photoisolator according to claim 1 is characterized in that, described linearity output unit is made of at least one operational amplifier V3.
5. photoisolator according to claim 1 and 2 is characterized in that, described non-linear input block; be provided with a holding circuit that constitutes by diode D2, resistance R 5 at its input end; wherein, with respect to described input port Uin, described diode D2, resistance R 5 are connected in parallel.
6. photoisolator according to claim 1 and 2, it is characterized in that, described non-linear input block, extremely be provided with a voltage stabilizing biasing circuit that constitutes by resistance R 7, stabilivolt D3 its described photoelectric isolating device V1 former, wherein, the positive terminal of described stabilivolt D3 is connected with described resistance 7, the negative pole end ground connection of stabilivolt 3.
7. photoisolator according to claim 1 and 2, it is characterized in that, described non-linear input block, extremely be provided with a voltage stabilizing biasing circuit that constitutes by resistance R 8, R9, stabilivolt D4 its described photoelectric isolating device V1 former, wherein, the positive terminal ground connection of described stabilivolt D4, the negative pole end of stabilivolt D4 is connected with branch pressure side between described resistance R 8, the R9.
8. photoisolator according to claim 1 and 2, it is characterized in that, described non-linear input block, extremely be provided with a voltage follower that constitutes by operational amplifier V4 its described photoelectric isolating device V1 former, wherein, the output terminal of described operational amplifier V4 is connected with described input resistance R3.
9. according to claim 1 or 4 described photoisolators, it is characterized in that described linearity output unit, a diode D1 in parallel, a capacitor C 1 between its output port Uout and its negative input end.
10. the preparation method by the described photoisolator of claim 1 is characterized in that, comprises the following steps:
A. with respect to non-linear input block, comparison adjustment unit, select a pair of its parameter, characteristic unanimity or close photoelectric coupled device V1, V2;
B. specifying described V1 is the isolating device of input stage, realizes the isolation of primary circuit and secondary circuit;
C. specifying described V2 is the mirror image of described V1;
D. with respect to linearity output unit, select for use operational amplifier V3 more than one or one and capacitor C 1 to make comparisons to amplify and use;
E. optocoupler input resistance R3, the R4 and optocoupler output resistance R1, the R2 that select for use two resistances to equate respectively at the difference of optocoupler V1, V2, can suitably finely tune the resistance of one of them resistance;
F. dispose an output circuit that can supply described photoisolator to select for use;
G. dispose an input circuit that can supply described photoisolator to select for use;
H. dispose an active combinational circuit that can supply described photoisolator to select for use;
I. by step a. to step f. to step g. make an elementary passive photoisolator;
J. make an elementary active photoisolator by step a. to h..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610056924 CN101034492A (en) | 2006-03-07 | 2006-03-07 | Photoisolator and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610056924 CN101034492A (en) | 2006-03-07 | 2006-03-07 | Photoisolator and manufacturing method thereof |
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| CN101034492A true CN101034492A (en) | 2007-09-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794042A (en) * | 2014-01-25 | 2014-05-14 | 济南诺辉节能技术开发有限公司 | Sensor signal transmission module |
| CN107395191A (en) * | 2017-06-16 | 2017-11-24 | 薄焕林 | A kind of passive linear optical coupling isolator |
| CN108512544A (en) * | 2018-04-24 | 2018-09-07 | 中国船舶重工集团公司第七二六研究所 | conversion circuit |
-
2006
- 2006-03-07 CN CN 200610056924 patent/CN101034492A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794042A (en) * | 2014-01-25 | 2014-05-14 | 济南诺辉节能技术开发有限公司 | Sensor signal transmission module |
| CN107395191A (en) * | 2017-06-16 | 2017-11-24 | 薄焕林 | A kind of passive linear optical coupling isolator |
| CN108512544A (en) * | 2018-04-24 | 2018-09-07 | 中国船舶重工集团公司第七二六研究所 | conversion circuit |
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Open date: 20070912 |