CN2872496Y - Photoelectric isolator - Google Patents
Photoelectric isolator Download PDFInfo
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- CN2872496Y CN2872496Y CN 200620007437 CN200620007437U CN2872496Y CN 2872496 Y CN2872496 Y CN 2872496Y CN 200620007437 CN200620007437 CN 200620007437 CN 200620007437 U CN200620007437 U CN 200620007437U CN 2872496 Y CN2872496 Y CN 2872496Y
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Abstract
The utility model discloses a photoelectric isolator consisting of a non-linear input unit with isolating function, a contrast adjustment unit and a linear output unit, wherein the contrast adjustment unit is connected in parallel with the linear output unit between the input end and output end (Uout) of the linear output unit..Relative to the other input end of the linear input unit, the non-linear unit with an input end (Uin) is connected in parallel with the linear output unit. The optical coupler V2 in the contrast adjustment unit can be viewed as a mirror image of V1 in the non-linear input unit; the mirror image does not need additional power supply in the first stage and has quite loose requirements for secondary power supply. The operation amplifier V3 in the linear output unit serves the function of contrast amplification. The utility model has advantages of simple structure, small size and applicability in all kinds of situations.
Description
Technical field
The utility model relates to a kind of linear isolation amplifier that is used for simulating signal is isolated transmission, specifically a kind of photoisolator.
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, because the not only linear difference of optocoupler itself but also very responsive to environment temperature is difficult to resolve the problem in the engineering reality.This has 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 problem to be solved in the utility model provides a kind of linear photoconductor 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 utility model solves described problem is: a kind of photoisolator, wherein, 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; With respect to another input end of 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 with buffer action can be made of a photoelectric isolating device V1 as input stage, input resistance R3, output resistance R1, and the output terminal of described photoelectric isolating device V1 is connected with the positive input terminal of described linearity output unit.Described relatively adjustment unit can be made of mirror image photoelectric isolating device V2, input resistance R4, an output resistance R2 as described photoelectric isolating device V1, and the output terminal of described output resistance R2 is connected with the negative input end of described linearity output unit.Described linearity output unit can be made of at least one operational amplifier V3 and capacitor C 1, and its linear output port Uout is connected with the described input resistance R4 that compares in the adjustment unit.Described non-linear input block can be provided with a holding circuit that is made of diode D2, resistance R 5 at its input end, and wherein, described diode D2, resistance R 5 relative the former of photoelectric isolating device V1 extremely are connected in parallel.Described non-linear input block, its photoelectric isolating device V1 former a voltage stabilizing biasing circuit that is made of resistance R 7, stabilivolt D3 can be set extremely, wherein, the positive pole of described stabilivolt D3 is connected the minus earth of stabilivolt D3 with described resistance R 7.Described non-linear input block, extremely can be provided with a voltage stabilizing biasing circuit that constitutes by resistance R 8, R9, stabilivolt D4 its photoelectric isolating device V1 former, wherein, the plus earth of described stabilivolt D4, the negative pole of stabilivolt D4 is connected with branch pressure side between resistance R 8, the R9.At described non-linear input block, extremely can be provided with a voltage follow or an amplifying circuit that constitutes by operational amplifier V4 its photocoupler V1 former, wherein, the output terminal of described operational amplifier V4 is connected with described optocoupler input resistance R3.Described linearity output unit, being connected in parallel one between its linear output port Uout and its negative pole end keeps the stable diode D1 of output port Uout voltage.
Compared to existing technology, outstanding contributions of the present utility model show: described isolator only is made up of three cell mesh, promptly non-linear input block, comparison adjustment unit, linearity output unit.Elementary as isolator can be without additional power source; V2 can regard the mirror image of V1 as, and secondary power supply magnitude of voltage changes in very wide scope, and the technical indicator of isolator is almost constant; Very loose to secondary power supply index request; The V3 amplification usefulness of making comparisons can then can strengthen or increase the function of isolator less to having only an operational amplifier when using a plurality of amplifier in whole device; Photoelectric isolating device in the circuit can be operated in the inelastic region, and working current is little, and the power consumption of isolator is little, and security is good.
Description of drawings
Fig. 1 is the cellular construction block diagram of the linear isolator that relates to of the utility model;
Fig. 2 is the electrical block diagram about 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.
Embodiment
By Fig. 1 and in conjunction with Fig. 2 to Fig. 7, the utility model relates to a kind of photoisolator, wherein, 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; With respect to another input end of 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 with buffer action can be made of a photoelectric isolating device V1 as input stage, input resistance R3, output resistance R1, and the output terminal of described photoelectric isolating device V1 is connected with the positive input terminal of described linearity output unit.Described relatively adjustment unit can be made of mirror image photoelectric isolating device V2, input resistance R4, an output resistance R2 as described photoelectric isolating device V1, and the output terminal of described output resistance R2 is connected with the negative input end of described linearity output unit.Described linearity output unit can be made of at least one operational amplifier V3 and capacitor C 1, and its linear output port Uout is connected with the described input resistance R4 that compares in the adjustment unit.Described non-linear input block can be provided with a holding circuit that is made of diode D2, resistance R 5 at its input end, and wherein, described diode D2, resistance R 5 relative the former of photoelectric isolating device V1 extremely are connected in parallel.Described non-linear input block, its photoelectric isolating device V1 former a voltage stabilizing biasing circuit that is made of resistance R 7, stabilivolt D3 can be set extremely, wherein, the positive pole of described stabilivolt D3 is connected the minus earth of stabilivolt D3 with described resistance R 7.Described non-linear input block, extremely can be provided with a voltage stabilizing biasing circuit that constitutes by resistance R 8, R9, stabilivolt D4 its photoelectric isolating device V1 former, wherein, the positive pole of described stabilivolt D4 connects with reference to ground, and the negative pole of stabilivolt D4 is connected with branch pressure side between resistance R 8, the R9.At described non-linear input block, extremely can be provided with a voltage follow or an amplifying circuit that constitutes by operational amplifier V4 its photocoupler V1 former, wherein, the output terminal of described operational amplifier V4 is connected with described optocoupler input resistance R3.Described linearity output unit, being connected in parallel one between its linear output port Uout and its negative pole end keeps the stable diode D1 of output port Uout voltage.
In more detail, (seeing Fig. 3 especially), the linear photoconductor isolator that this device relates to, its basic building block comprises photoelectric isolating device V1, V2, amplifier V3, diode D1, diode D2 and resistance, capacitance component.When R5 did not insert, as the input resistance of two photoelectric isolating devices, resistance R 1 and R2 were respectively the output resistances of two photoelectric isolating devices respectively for resistance R 3 and R4.Here said two its resistances of input resistance equate, two its resistances of output resistance equate.Photoelectric isolating device 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 optocoupler characteristic of optocoupler 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 optocoupler V1 can be finely tuned compensation with variohm R4; And operational amplifier V3 is a comparison amplifier in this case.In concrete the application, this linear photoconductor isolator also can use a plurality of amplifiers to strengthen or to increase its function.For example, under current intelligence, the photoisolator input signal changes, and the V1 output signal is changed, make V3 in the linearity output unit+,-change of input terminal voltage difference, make V3 output Uout take place greatly to change like this, relatively same the variation takes place in the optocoupler V2 input voltage in the adjustment unit, and then changes by coupling V2 output voltage, this will make V3+,-the input terminal voltage difference changes again, enter circulation, its result finally 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, for output voltage signal, has realized linear transfer.
Because V2 and V1 are in identical duty, power source change can be offset fully to the influence of V1, V2, and when secondary power supply magnitude of voltage changed in very wide scope, the technical indicator effect of photoisolator was " almost constant ".The effect of capacitor C 1 is to make amplifying circuit stable.The effect of diode D1 be when input voltage Uin too little, and when being lower than the forward voltage (threshold voltage) of the primary diode of optocoupler V1, 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 R5 dividing potential drop improve the input voltage amplitude with expansion maximum input voltage scope.Resistance R 3 and electric capacity 2 constitute filtering circuit to improve antijamming capability.The effect of capacitor C 1 is to make the amplifying circuit working stability, also the high frequency interference in the filtering input signal.
Square frame among the figure " output circuit " means the scope etc. that can be transformed into current output signal or digital output signal to voltage signal or change output signal.
Fig. 5 in this case, Fig. 6 are the examples again of non-linear input block in the precision photoelectric coupler, also can be referred to as the active combinational circuit in the precision photoelectric coupler, 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, and Fig. 5 uses negative supply, and Fig. 6 uses positive supply, and their effect is to make the input signal working range expand to zero or minus zone.
Because this device circuit is simple, it is little to take volume, provides convenience to combination of circuits.Being used in combination of several modes more than the easier realization in element circuit, module, or be used in combination with basic circuit commonly used.Use stabilivolt and operational amplifier to allow elementary power supply magnitude of voltage to change in very wide scope in the circuit, this makes the linear photoconductor isolator also is non-constant width pine to the index request of elementary power supply.
Claims (9)
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; With respect to another input end of 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 with buffer action is made of a photoelectric isolating device V1 as input stage, input resistance R3, output resistance R1, and the output terminal of described photoelectric isolating device V1 is connected with the positive input terminal of described linearity output unit.
3. photoisolator according to claim 1, it is characterized in that, described relatively adjustment unit is made of mirror image photoelectric isolating device V2, input resistance R4, an output resistance R2 as described photoelectric isolating device V1, and the output terminal of described output resistance R2 is connected with the negative input end of described linearity output unit.
4. photoisolator according to claim 1 is characterized in that, described linearity output unit is made of at least one operational amplifier V3, and its linear output port Uout is connected with the described input resistance R4 that compares in the adjustment unit.
5. photoisolator according to claim 1 and 2; it 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, described diode D2, resistance R 5 relative the former of photoelectric isolating device V1 extremely 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 photoelectric isolating device V1 former, wherein, the positive pole of described stabilivolt D3 is connected the minus earth of stabilivolt D3 with described resistance R 7.
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 photoelectric isolating device V1 former, wherein, the plus earth of described stabilivolt D4, the negative pole of stabilivolt D4 is connected with branch pressure side between resistance R 8, the R9.
8. photoisolator according to claim 1 and 2, it is characterized in that, at described non-linear input block, extremely be provided with a voltage follow or an amplifying circuit that constitutes by operational amplifier V4 its photocoupler V1 former, wherein, the output terminal of described operational amplifier V4 is connected with described optocoupler input resistance R3.
9. according to claim 1 or 4 described photoisolators, it is characterized in that, described linearity output unit, being connected in parallel one between its linear output port Uout and its negative input end keeps the stable diode D1 of output port Uout voltage, capacitor C 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620007437 CN2872496Y (en) | 2006-03-07 | 2006-03-07 | Photoelectric isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620007437 CN2872496Y (en) | 2006-03-07 | 2006-03-07 | Photoelectric isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2872496Y true CN2872496Y (en) | 2007-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620007437 Expired - Fee Related CN2872496Y (en) | 2006-03-07 | 2006-03-07 | Photoelectric isolator |
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| CN (1) | CN2872496Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895290A (en) * | 2009-05-20 | 2010-11-24 | 上海宝信软件股份有限公司 | Level converting circuit |
| CN101645708B (en) * | 2009-07-21 | 2011-10-05 | 叶克江 | Linear isolating circuit based on optical couplers and method |
| CN103199917A (en) * | 2013-03-19 | 2013-07-10 | 启东文鑫电子有限公司 | Optoelectronic isolator |
-
2006
- 2006-03-07 CN CN 200620007437 patent/CN2872496Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895290A (en) * | 2009-05-20 | 2010-11-24 | 上海宝信软件股份有限公司 | Level converting circuit |
| CN101645708B (en) * | 2009-07-21 | 2011-10-05 | 叶克江 | Linear isolating circuit based on optical couplers and method |
| CN103199917A (en) * | 2013-03-19 | 2013-07-10 | 启东文鑫电子有限公司 | Optoelectronic isolator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070221 Termination date: 20100307 |