CN101854168A - Photoelectric coupler isolated communication circuit - Google Patents
Photoelectric coupler isolated communication circuit Download PDFInfo
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- CN101854168A CN101854168A CN201010149089A CN201010149089A CN101854168A CN 101854168 A CN101854168 A CN 101854168A CN 201010149089 A CN201010149089 A CN 201010149089A CN 201010149089 A CN201010149089 A CN 201010149089A CN 101854168 A CN101854168 A CN 101854168A
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- triode
- resistor
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- photoelectric coupler
- isolated communication
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Abstract
The invention discloses a photoelectric coupler isolated communication circuit, which comprises a photoelectric coupler, a first pull-up resistor, a second pull-up resistor, a first triode and a first auxiliary resistor. The photoelectric coupler comprises a light emitting diode arranged in a primary loop and a photistor arranged in a secondary loop. The anode of the light emitting diode is connected with a first voltage source through the first pull-up resistor, the cathode of the light emitting diode receives primary signals, the collector of the photistor is coupled with a second voltage source and outputs secondary signals, the base of the first triode is connected with the emitter of the photistor through the first auxiliary resistor, the emitter of the first triode is grounded, and the collector of the first triode is connected with the second voltage source through the second pull-up resistor. Through adding the first triode and the relevant auxiliary resistor to form a two-stage drive structure, high-speed isolated communication can be realized without adopting any high-speed photoelectric coupler and the cost of the circuit is low.
Description
Technical field
The present invention relates to electronic communication equipment, particularly a kind of photoelectric coupler isolated communication circuit.
Background technology
In existing telecommunication circuit, the isolated communication circuit of employing common optoelectronic coupler (abbreviation optocoupler) is difficult to satisfy the requirement of high-speed isolated communication.Fig. 1 has provided the isolated communication circuit topology of being made up of common optocoupler (for example model is PS2701), and Fig. 2 and Fig. 3 have provided the waveform of the signal rising response speed and the decline response speed of this isolated communication circuit respectively.Among Fig. 2, abscissa 1 lattice are 20uS, and ordinate one lattice are 1V, and two places that holding wire and vertical line intersect are respectively voltage and rise to 10% and 90% point, and Δ: 56.8uS represents from 10% to 90% rise time Tr, and promptly Shi Ce rise time Tr is 56.8us.Among Fig. 3, abscissa 1 lattice are 10uS, and ordinate one lattice are 1V, and two places that holding wire and vertical line intersect are respectively voltage and drop to 90% and 10% point, and Δ: 20.8uS represents from 90% to 10% Tf fall time, and promptly Shi Ce Tf fall time is 20.8us.If according to rise time of signal in the high-speed communication with respectively be no more than 1/10 the calculating of high level of transmission signals fall time, the dynamic responding speed of this circuit is lower, and therefore can only be used for signal rate is the following communication as 1200bps of 1760bps.For satisfying the requirement of high-speed communication, adopt high speed photo coupling to replace common optocoupler usually, yet though this scheme can reach requirement on communication speed, because high speed photo coupling is than common optocoupler on price expensive several times, so the cost of product is higher.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of photoelectric coupler isolated communication circuit cheaply that high-speed isolated communication requires that satisfies is provided.
For achieving the above object, the present invention is by the following technical solutions:
A kind of photoelectric coupler isolated communication circuit, comprise photoelectrical coupler, first pull-up resistor and second pull-up resistor, described photoelectrical coupler comprises light-emitting diode that is arranged in primary return and the phototriode that is arranged in the secondary loop, the anode of described light-emitting diode connects first voltage source by described first pull-up resistor, the negative electrode of described light-emitting diode receives primary signal, the collector coupled of described phototriode is to second voltage source and export secondary signal, described photoelectric coupler isolated communication circuit also comprises first triode, first auxiliary resistance and second auxiliary resistance, the base stage of described first triode connects the emitter of described phototriode by described first auxiliary resistance, the grounded emitter of described first triode, the collector electrode of described first triode connects described second voltage source by described second pull-up resistor.
Described photoelectric coupler isolated communication circuit also comprises second auxiliary resistance, and the emitter of described first triode connects the base stage of described first triode by described second auxiliary resistance.
Preferably, described photoelectric coupler isolated communication circuit also comprises first electric capacity, and described first electric capacity is attempted by the described first pull-up resistor two ends.
Beneficial technical effects of the present invention is:
The present invention has increased by first triode and first auxiliary resistance at photoelectric coupler isolated communication circuit, the base stage of first triode connects the emitter of phototriode by first auxiliary resistance, the grounded emitter of first triode also is connected to the base stage of first triode, and the collector electrode of first triode connects second voltage source by second pull-up resistor, the emitter current of phototriode is as the base current of first triode, thereby formed two-stage drive structure, this two-stage drive structure plays the effect that improves the photoelectric coupler isolated communication circuit dynamic response, make signal rise, response speed during decline improves, reduce the rise time and the fall time of signal, satisfied the requirement of high-speed isolated communication; Simultaneously, compare with the isolated communication circuit of existing employing high speed photo coupling, the present invention constitutes two-stage drive structure by increasing by first triode with relevant auxiliary resistance, do not need to adopt high speed photo coupling just can realize high-speed isolated communication, so the cost of circuit is lower.
Preferably, can and connect first electric capacity at the first pull-up resistor two ends, first electric capacity plays the function that moment provides big electric current at the trailing edge of signal, thereby can further reduce the fall time of signal.
Description of drawings
Fig. 1 is the isolated communication circuit topology figure of the existing common optocoupler that adopts;
Fig. 2 is the oscillogram of signal rising response speed in the isolated communication circuit shown in Figure 1;
Fig. 3 is the oscillogram of signal decline response speed in the isolated communication circuit shown in Figure 1;
The photoelectric coupler isolated communication circuit topological diagram of Fig. 4 institute an embodiment of the present invention;
Fig. 5 is the photoelectric coupler isolated communication circuit topological diagram of a kind of preferred embodiment of the present invention;
Fig. 6 is the oscillogram of signal rising response speed in the isolated communication circuit shown in Figure 5;
Fig. 7 is the oscillogram of signal decline response speed in the isolated communication circuit shown in Figure 5.
Embodiment
In conjunction with the accompanying drawings the present invention is further described in detail by the following examples.
Please refer to Fig. 4, in one embodiment, photoelectric coupler isolated communication circuit comprises photoelectrical coupler U15, the first pull-up resistor R88, the second pull-up resistor R92, the first triode Q4 and the first auxiliary resistance R19, wherein, photoelectrical coupler U15 comprises light-emitting diode D1 that is arranged in primary return and the phototriode T1 that is arranged in the secondary loop.At the optocoupler primary return, the anode of light-emitting diode D1 connects first voltage source V 1 (as 3.3V) by the first pull-up resistor R88, and the negative electrode of light-emitting diode receives primary signal TXD0; In the optocoupler secondary loop, the collector coupled of phototriode T1 is to second voltage source V 2 (as 5V) and export secondary signal TXD0O, the base stage of first triode connects the emitter of phototriode T1 by the first auxiliary resistance R19, the grounded emitter GND1 of the first triode Q4, the collector electrode of the first triode Q4 connects second voltage source V 2 by the second pull-up resistor R92.Preferably set up the second auxiliary resistance R98, the emitter of the first triode Q4 connects the base stage of the first triode Q4 by the second auxiliary resistance R98.
According to the foregoing circuit topology, the base stage of the first triode Q4 connects the emitter of phototriode T1 by the first auxiliary resistance R19, make the emitter current of phototriode T1 as the base current of the first triode Q4, thereby formed two-stage drive structure, this two-stage drive structure can be improved the dynamic response capability of photoelectric coupler isolated communication circuit, improve signal rising, the response speed when descending, reduce the rise time and the fall time of signal.Adopt this circuit, the rise time Tr of signal from 10% to 90% is 1.22us, and from 90% to 10% Tf fall time is 300ns, and communication speed reaches 46 times of existing scheme.According to 1/10 calculating that respectively is no more than rise time and fall time high level, this circuit can be supported the high speed communication of 84745bps, and owing to be not to realize that by the employing high speed photo coupling at a high speed, the cost of this circuit is also lower, thereby obtained high-performance with minimum cost.
Please refer to Fig. 5, in a preferred embodiment, photoelectric coupler isolated communication circuit also is provided with first capacitor C, 10, the first capacitor C 10 and is attempted by the first pull-up resistor R88 two ends except increasing by the first triode Q4, the first auxiliary resistance R19 and the second auxiliary resistance R98.Owing to increase by first electric capacity at the optocoupler primary return, first electric capacity plays the function that moment provides big electric current at the trailing edge of signal, thereby the photoelectric coupler isolated communication circuit of present embodiment can further reduce the fall time of signal.
Fig. 6 and Fig. 7 have provided embodiment illustrated in fig. 5 when adopting common optocoupler respectively, the waveform of signal rising response speed and decline response speed.Among Fig. 6, abscissa 1 lattice are 400nS, and ordinate one lattice are 1V, and two places that holding wire and vertical line intersect are respectively voltage and rise to 10% and 90% point, and Δ: 1.18uS represents that from 10% to 90% rise time Tr is 1.18uS.Among Fig. 7, abscissa 1 lattice are 20nS, and ordinate one lattice are 1V, and two places that holding wire and vertical line intersect are respectively and drop to 90% and 10% point, and Δ: 30.4nS represents that from 90% to 10% Tf fall time is 30.4nS.Can see that the signal of this circuit rises and the isolated communication circuit of the common optocoupler of all more existing employing fall time shortens dramatically, dynamic responding speed improves greatly, reaches 48 times of existing scheme.Owing to still be not by adopting high speed photo coupling to realize that at a high speed, the cost of this circuit is also lower.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (3)
1. photoelectric coupler isolated communication circuit, comprise photoelectrical coupler, first pull-up resistor and second pull-up resistor, described photoelectrical coupler comprises light-emitting diode that is arranged in primary return and the phototriode that is arranged in the secondary loop, the anode of described light-emitting diode connects first voltage source by described first pull-up resistor, the negative electrode of described light-emitting diode receives primary signal, the collector coupled of described phototriode is to second voltage source and export secondary signal, it is characterized in that, described photoelectric coupler isolated communication circuit also comprises first triode and first auxiliary resistance, the base stage of described first triode connects the emitter of described phototriode by described first auxiliary resistance, the grounded emitter of described first triode, the collector electrode of described first triode connects described second voltage source by described second pull-up resistor.
2. photoelectric coupler isolated communication circuit as claimed in claim 1 is characterized in that described photoelectric coupler isolated communication circuit also comprises second auxiliary resistance, and the emitter of described first triode connects the base stage of described first triode by described second auxiliary resistance.
3. photoelectric coupler isolated communication circuit as claimed in claim 1 or 2 is characterized in that described photoelectric coupler isolated communication circuit also comprises first electric capacity, and described first electric capacity is attempted by the described first pull-up resistor two ends.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010149089A CN101854168A (en) | 2010-04-06 | 2010-04-06 | Photoelectric coupler isolated communication circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010149089A CN101854168A (en) | 2010-04-06 | 2010-04-06 | Photoelectric coupler isolated communication circuit |
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| CN101854168A true CN101854168A (en) | 2010-10-06 |
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| CN201010149089A Pending CN101854168A (en) | 2010-04-06 | 2010-04-06 | Photoelectric coupler isolated communication circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109166689A (en) * | 2018-09-26 | 2019-01-08 | 浙江众邦机电科技有限公司 | A kind of high-speed isolated driving circuit, solenoid driver circuit system |
| CN109861682A (en) * | 2019-03-21 | 2019-06-07 | 联桥科技有限公司 | A kind of photoelectric coupled circuit and photoelectrical coupler for middling speed communication |
| CN110456129A (en) * | 2019-08-09 | 2019-11-15 | 锐捷网络股份有限公司 | A kind of current potential difference detecting circuit, detection method and POE system |
| CN110515880A (en) * | 2019-08-22 | 2019-11-29 | 烟台东方威思顿电气有限公司 | A method of improving light-coupled isolation serial communication rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5550224A (en) * | 1978-10-09 | 1980-04-11 | Toshiba Corp | Light logic control device |
| US4667212A (en) * | 1984-09-03 | 1987-05-19 | Kabushiki Kaisha Toshiba | Integrated optical and electric circuit device |
| CN1219815A (en) * | 1998-08-15 | 1999-06-16 | 深圳市华为电气股份有限公司 | Secondary power tube driving circuit for medium and large power ringing current converter |
| CN101262220A (en) * | 2008-05-08 | 2008-09-10 | 上海聚新电子科技有限公司 | Optical coupling acceleration circuit |
-
2010
- 2010-04-06 CN CN201010149089A patent/CN101854168A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550224A (en) * | 1978-10-09 | 1980-04-11 | Toshiba Corp | Light logic control device |
| US4667212A (en) * | 1984-09-03 | 1987-05-19 | Kabushiki Kaisha Toshiba | Integrated optical and electric circuit device |
| CN1219815A (en) * | 1998-08-15 | 1999-06-16 | 深圳市华为电气股份有限公司 | Secondary power tube driving circuit for medium and large power ringing current converter |
| CN101262220A (en) * | 2008-05-08 | 2008-09-10 | 上海聚新电子科技有限公司 | Optical coupling acceleration circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109166689A (en) * | 2018-09-26 | 2019-01-08 | 浙江众邦机电科技有限公司 | A kind of high-speed isolated driving circuit, solenoid driver circuit system |
| CN109861682A (en) * | 2019-03-21 | 2019-06-07 | 联桥科技有限公司 | A kind of photoelectric coupled circuit and photoelectrical coupler for middling speed communication |
| CN109861682B (en) * | 2019-03-21 | 2023-11-28 | 联桥科技有限公司 | Optical coupler circuit and optical coupler for medium-speed communication |
| CN110456129A (en) * | 2019-08-09 | 2019-11-15 | 锐捷网络股份有限公司 | A kind of current potential difference detecting circuit, detection method and POE system |
| CN110515880A (en) * | 2019-08-22 | 2019-11-29 | 烟台东方威思顿电气有限公司 | A method of improving light-coupled isolation serial communication rate |
| CN110515880B (en) * | 2019-08-22 | 2021-06-04 | 烟台东方威思顿电气有限公司 | Method for improving optical coupling isolation serial communication rate |
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Application publication date: 20101006 |