CN204425315U - A kind of photoisolator - Google Patents
A kind of photoisolator Download PDFInfo
- Publication number
- CN204425315U CN204425315U CN201420724351.2U CN201420724351U CN204425315U CN 204425315 U CN204425315 U CN 204425315U CN 201420724351 U CN201420724351 U CN 201420724351U CN 204425315 U CN204425315 U CN 204425315U
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- voltage
- resistance
- optocoupler
- photoisolator
- follow unit
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Abstract
The utility model discloses a kind of photoisolator, comprise optocoupler, voltage stabilizing didoe, voltage follow unit, voltage input end, voltage output end, wherein, the plus earth of described voltage stabilizing didoe, and also by series connection the first resistance and the second resistance be connected to described voltage input end, negative pole is connected to the negative electrode of described optocoupler, also be connected to the tie point of described first resistance and the second resistance by the 3rd resistance of series connection and electric capacity, the anode of described optocoupler is connected to described voltage input end by the 4th resistance, grounded emitter, collector electrode connects the input of described voltage follow unit, the output of described voltage follow unit is connected to described voltage output end.The utility model can make the direct connection not having electricity between segregate two parts circuit, can also pass through feedback regulation output voltage, reach voltage stabilizing object.
Description
Technical field
The utility model relates to field of photoelectric technology, particularly relates to a kind of photoisolator.
Background technology
Optocoupler take light as the media transmission signal of telecommunication.It has good buffer action, so it is widely used in various circuit to input, the output signal of telecommunication.There is many no small ringing pulses in commercial Application environment, these ringing pulses can have influence on the transmission of data, even injure the equipment of interconnection, in order to obtain faultless transfer of data in high-speed field bus communication, industrial system design engineer must process these interference.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of photoisolator, can make the direct connection not having electricity between segregate two parts circuit, can also pass through feedback regulation output voltage, reach voltage stabilizing object.
In order to solve the problems of the technologies described above, the utility model provides a kind of photoisolator, comprise optocoupler, voltage stabilizing didoe, voltage follow unit, voltage input end, voltage output end, wherein, the plus earth of described voltage stabilizing didoe, and also by series connection the first resistance and the second resistance be connected to described voltage input end, negative pole is connected to the negative electrode of described optocoupler, also be connected to the tie point of described first resistance and the second resistance by the 3rd resistance of series connection and electric capacity, the anode of described optocoupler is connected to described voltage input end by the 4th resistance, grounded emitter, collector electrode connects the input of described voltage follow unit, the output of described voltage follow unit is connected to described voltage output end.
Wherein, the collector electrode of described optocoupler also connects optocoupler supply power voltage by the 5th resistance.
Wherein, described voltage follow unit comprises triode and the 6th resistance, and the base stage of described triode is connected to the input of described voltage follow unit, and collector electrode is connected to described optocoupler supply power voltage, emitter is connected to the output of described voltage follow unit, also by described 6th grounding through resistance.
Implement the utility model, there is following beneficial effect: photoisolator makes not have between segregate two parts circuit the direct connection of electricity, between the control circuit mainly preventing the interference, particularly low pressure caused because there being the connection of electricity and external high pressure circuit.Can also change output duty ratio by regulating input in addition, regulation output voltage swing, reaches accurate voltage stabilizing object.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the photoisolator that the utility model embodiment provides;
The circuit diagram of voltage follow unit in Fig. 2 Fig. 1.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the circuit diagram of the photoisolator that the utility model embodiment provides, comprise optocoupler U1, voltage stabilizing didoe D1, voltage follow unit, voltage input end Ui, voltage output end Uo, wherein, the plus earth of voltage stabilizing didoe D1, and also by series connection the first resistance R1 and the second resistance R2 be connected to voltage input end Ui, negative pole is connected to the negative electrode of optocoupler U1, also be connected to the tie point of the first resistance R1 and the second resistance R2 by the 3rd resistance R3 of series connection and electric capacity C1, the anode of optocoupler U1 is connected to voltage input end Ui by the 4th resistance R4, grounded emitter, collector electrode connects the input in of voltage follow unit, the output out of voltage follow unit is connected to voltage output end Uo.The collector electrode of optocoupler U1 also connects optocoupler supply power voltage Ud by the 5th resistance R5.
Wherein, the former limit of optocoupler U1 is equivalent to a light-emitting diode, and primary current If is larger, and light intensity is stronger, and the electric current I c of secondary triode is larger.The ratio of secondary triode electric current I c and former limit diode current If is called the current amplification factor of optocoupler, and this coefficient varies with temperature and changes, and temperature influence is larger.
As shown in Figure 2, voltage follow unit comprises triode Q1 and the 6th resistance R6, and the base stage of triode Q1 is connected to the input of voltage follow unit, and collector electrode is connected to optocoupler supply power voltage Ud, emitter is connected to the output of voltage follow unit, also by the 6th grounding through resistance.Voltage follow unit plays buffering, isolation, improves load capacity.
Wherein, triode Q1 is NPN type triode.The optocoupler U1 of optocoupler U1 to be model be TLP521 or PC817.The voltage stabilizing didoe D1 of voltage stabilizing didoe D1 to be model be 2CW.
Utility model works principle is: when voltage input end Ui raises, the anode voltage of optocoupler U1 rises, cathode voltage declines, the primary current If of optocoupler U1 increases, the other end output current Ic of optocoupler increases, and the voltage drop on resistance R5 increases, and optocoupler collector voltage declines, duty ratio reduces, and voltage output end Uo output voltage reduces; Otherwise when voltage input end Ui reduces, adjustment process is similar.
Photoisolator of the present utility model makes the direct connection not having electricity between segregate two parts circuit, between the control circuit mainly preventing the interference, particularly low pressure caused because there being the connection of electricity and external high pressure circuit.Can also change output duty ratio by regulating input in addition, regulation output voltage swing, reaches accurate voltage stabilizing object.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or device and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or device.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the device comprising this key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a photoisolator, it is characterized in that, comprise optocoupler, voltage stabilizing didoe, voltage follow unit, voltage input end, voltage output end, wherein, the plus earth of described voltage stabilizing didoe, and also by series connection the first resistance and the second resistance be connected to described voltage input end, negative pole is connected to the negative electrode of described optocoupler, also be connected to the tie point of described first resistance and the second resistance by the 3rd resistance of series connection and electric capacity, the anode of described optocoupler is connected to described voltage input end by the 4th resistance, grounded emitter, collector electrode connects the input of described voltage follow unit, the output of described voltage follow unit is connected to described voltage output end.
2. photoisolator as claimed in claim 1, is characterized in that, the collector electrode of described optocoupler also connects optocoupler supply power voltage by the 5th resistance.
3. photoisolator as claimed in claim 2, it is characterized in that, described voltage follow unit comprises triode and the 6th resistance, the base stage of described triode is connected to the input of described voltage follow unit, collector electrode is connected to described optocoupler supply power voltage, emitter is connected to the output of described voltage follow unit, also by described 6th grounding through resistance.
4. photoisolator as claimed in claim 3, it is characterized in that, described triode is NPN type triode.
5. photoisolator as claimed in claim 1, is characterized in that, the optocoupler of described optocoupler to be model be TLP521 or PC817.
6. photoisolator as claimed in claim 1, is characterized in that, the voltage stabilizing didoe of described voltage stabilizing didoe to be model be 2CW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420724351.2U CN204425315U (en) | 2014-11-26 | 2014-11-26 | A kind of photoisolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420724351.2U CN204425315U (en) | 2014-11-26 | 2014-11-26 | A kind of photoisolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204425315U true CN204425315U (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420724351.2U Expired - Fee Related CN204425315U (en) | 2014-11-26 | 2014-11-26 | A kind of photoisolator |
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| CN (1) | CN204425315U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518782A (en) * | 2014-11-26 | 2015-04-15 | 苏州速腾电子科技有限公司 | Optoelectronic isolator |
-
2014
- 2014-11-26 CN CN201420724351.2U patent/CN204425315U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104518782A (en) * | 2014-11-26 | 2015-04-15 | 苏州速腾电子科技有限公司 | Optoelectronic isolator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20151126 |