CN201699683U - Photoelectrical coupling circuit for improving data transfer rate - Google Patents
Photoelectrical coupling circuit for improving data transfer rate Download PDFInfo
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- CN201699683U CN201699683U CN201020245675XU CN201020245675U CN201699683U CN 201699683 U CN201699683 U CN 201699683U CN 201020245675X U CN201020245675X U CN 201020245675XU CN 201020245675 U CN201020245675 U CN 201020245675U CN 201699683 U CN201699683 U CN 201699683U
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Abstract
The utility model discloses a photoelectrical coupling circuit for improving the data transfer rate, which comprises a signal input circuit and a general photoelectric coupler, wherein the output end of the general photoelectric coupler is connected with an output circuit, the output circuit comprises a switching triode and a triode drive power supply, wherein the base electrode of the switching triode is connected with the emitting electrode of a photistor in the general photoelectric coupler through a current-limiting resistance, the collector electrode of the switching triode is connected with the collector electrode of the photistor through the current-limiting resistance, a triode drive power supply plays the role of supplying power, the emitting electrode of the switching triode is connected with the ground, and the emitting electrode of the photistor is connected with the emitting electrode of the switching triode through the current-limiting resistance. The utility model connects the signal output circuit with the output end of the general photoelectric coupler, so the photistor works in an amplifying area when being switched on, the turn off time of an optocoupler is greatly shortened, so the utility model realizes the effective shaping of the output waveform of the optocoupler, and improves the transmission speed of the optocoupler.
Description
Technical field
The utility model relates to a kind of photoelectricity coupling circuit that is used to improve message transmission rate.
Background technology
Universal optocoupler, inside comprises light-emitting diode and phototriode, because its excellent electric insulating and antijamming capability, therefore be widely used in the various signal circuits that need electrical isolation, photoelectric coupled circuit is because when the optocoupler conducting, phototriode is in saturation condition, this moment, collector current and base current were not contacted directly, but by externally fed voltage and load resistance decision, like this when the base current vanishing, collector current is vanishing at once not, therefore it is longer that triode returns to the cut-off state required time, cause the rise time of signal output waveform longer, therefore universal optocoupler can only be used for the circuit that signal transmission rate is not higher than 10Kbps usually, and the application scenario is high more to rate request, the power consumption of system also increases many more, certainly, the signal transmission rate of high speed photo coupling can arrive more than the 10Mbps, and is expensive a lot of but the more universal optocoupler of its cost is wanted.
The utility model content
The purpose of this utility model is to provide a kind of message transmission rate that improves, the photoelectricity coupling circuit that reduces cost.
This photoelectricity coupling circuit that is used to improve message transmission rate that the utility model provides, comprise signal input circuit, the general light electric coupling, described general photoelectric coupler output end is connected to output circuit, this output circuit comprises switch triode, the triode driving power, the base stage of wherein said switch triode links to each other with the emitter of phototriode in the described general light electric coupling by a current-limiting resistance, the collector electrode of described switch triode and phototriode links to each other by a current-limiting resistance, and unification is powered by the triode driving power, described switch triode grounded emitter, described phototriode emitter links to each other by a current-limiting resistance with described switch triode emitter.
Be serially connected with current-limiting resistance between described phototriode and the switch triode emitter much smaller than the current-limiting resistance that links to each other with described switch triode base stage, make when described phototriode emitter current is excessive to have only the fraction electric current to flow into described switch triode base stage.The current-limiting resistance that is serially connected with between described phototriode and the switch triode emitter is also connected with a diode, to suppress the reverse current of switch triode emitter.
Adopting the universal optical electric coupling to carry out in the process of signal transmission, because the operating state of phototriode is difficult to accurate control, make it be easy to enter degree of depth saturation condition at work, and under degree of depth saturation condition, the output signal and the input signal of phototriode are not contacted directly, when input signal changes, time-delay can appear in output signal, the utility model provides, and this photoelectricity coupling circuit that is used to improve message transmission rate has added signal output apparatus at the output of photoelectrical coupler, phototriode also is operated in magnifying state when making phototriode be operated in the amplification region of triode when conducting, and current characteristics is as can be known when being operated in magnifying state according to triode: under magnifying state, and collector current I
CWith base current I
BThere is following linear relationship: I
C=β I
B(β is a constant), therefore when base current changes, collector current can be believed linear change takes place simultaneously, under magnifying state, time-delay can not appear in the transmission of signal like this, thereby has shortened the turn-off time of optocoupler greatly, realized the effective shaping of optocoupler output waveform, improved the transmission rate (speed can reach about 40Kbps usually) of optocoupler, reduced power consumption, the utility model circuit is simple simultaneously, cost is lower.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model.
Embodiment
As can be seen from Figure 1, the photoelectricity coupling circuit that this practicality newly is used to improve message transmission rate comprises signal input circuit, the general light electric coupling, signal output apparatus, wherein signal input circuit comprises power supply VCC and resistance R 1, general light electric coupling U1 comprises light-emitting diode and phototriode, wherein light-emitting diode is anodal links to each other with driving power VCC by resistance R 1, negative pole connects input signal, signal output apparatus comprises switch triode Q1, diode D1, current-limiting resistance R2, R3, R4 and power vd D, wherein the base stage of switch triode Q1 links to each other with the emitter of phototriode by current-limiting resistance R2, the collector electrode of switch triode Q1 and phototriode links to each other by current-limiting resistance R4, and unification is powered by triode driving power VDD, the grounded emitter of switch triode Q1, diode D1 is used for suppressing the reverse current of Q1 emitter, D1 links to each other with the phototriode emitter with current-limiting resistance R3 serial connection back one end, and the other end links to each other with switch triode Q1 emitter, and wherein R2 is much larger than R3, IN is the signal input part pin, and OUT is the signal output part pin.
The concrete working method of the utility model is:
Signal input circuit pin IN receiving inputted signal, when light-emitting diodes is driven when luminous, the phototriode conducting, the triode driving power VDD provide electric current to phototriode, (for example R3 can get about 50 ohm because R2 is much larger than R3, R2 can get about 2K), diode D1 meeting conducting, and the phototriode emitter current is most of can to arrive ground by diode D1 and resistance R 3, make the flow through undercurrent of triode Q1 base stage saturated to allow triode Q1 enter the degree of depth, simultaneously since the conduction voltage drop of diode very little (the silicone tube tube voltage drop is about about 0.7V, the germanium tube tube voltage drop is about about 0.3V), the resistance of resistance R 3 is also smaller, so voltage of the emitter of phototriode (being diode D1 and resistance R 3 voltage sums) lower (usually about 1V), can be very not approaching with the collector voltage of phototriode, it is saturated equally also to make phototriode can not enter the degree of depth, phototriode and switch triode Q1 or be in cut-off state in signals transmission like this, be in magnifying state, can shorten the time-delay of signal transmission greatly.Therefore when the light-emitting diode conducting, the phototriode conducting that is triggered, the switch triode conducting that at once also is triggered, and all be in the amplification operating state, the signal normal transmission, when light-emitting diode ends, phototriode ends, its emitter current moment is almost nil, Q1 ends fast according to IC=β IB switch triode, even the level of OUT pin (for example 10K) its rise time when the R4 value is big also can shorten greatly like this, basically signal transmission rate can reach about 40K, and universal optocoupler is under situation about not quickening, and general R1 value is about 1.5K, the R4 value is the speed that just can reach 10K about 1K, has promptly realized reaching transmission speed faster with lower power consumption.
Claims (3)
1. be used to improve the photoelectricity coupling circuit of message transmission rate, comprise signal input circuit, the general light electric coupling, it is characterized in that described general photoelectric coupler output end is connected to output circuit, this output circuit comprises switch triode, the triode driving power, the base stage of wherein said switch triode links to each other with the emitter of phototriode in the described general light electric coupling by a current-limiting resistance, described switch triode collector electrode links to each other with the collector electrode of described phototriode by a current-limiting resistance, and unification is powered by the triode driving power, the switch triode grounded emitter, described phototriode emitter links to each other by a current-limiting resistance with the switch triode emitter.
2. want 1 described a kind of photoelectricity coupling circuit that is used to improve message transmission rate according to right, it is characterized in that being serially connected with current-limiting resistance between described phototriode and the switch triode emitter much smaller than the current-limiting resistance that links to each other with described switch triode base stage, make when described phototriode emitter current is excessive to have only the fraction electric current to flow into described switch triode base stage.
3. a kind of photoelectricity coupling circuit that is used to improve message transmission rate according to claim 1, the current-limiting resistance that it is characterized in that being serially connected with between described phototriode and the switch triode emitter is also connected with a diode, to suppress the reverse current of described switch triode emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020245675XU CN201699683U (en) | 2010-07-02 | 2010-07-02 | Photoelectrical coupling circuit for improving data transfer rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020245675XU CN201699683U (en) | 2010-07-02 | 2010-07-02 | Photoelectrical coupling circuit for improving data transfer rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201699683U true CN201699683U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020245675XU Expired - Lifetime CN201699683U (en) | 2010-07-02 | 2010-07-02 | Photoelectrical coupling circuit for improving data transfer rate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN104038203A (en) * | 2013-03-06 | 2014-09-10 | 欣旺达电子股份有限公司 | Optocoupler communication acceleration system |
| CN105703611A (en) * | 2016-03-11 | 2016-06-22 | 深圳市华星光电技术有限公司 | Voltage feedback circuit of flyback switching power supply and flyback switching power supply |
| CN106941349A (en) * | 2016-01-05 | 2017-07-11 | 浙江盾安机械有限公司 | A kind of low delay optical coupling isolation circuit and RS485 isolate telecommunication circuit |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
| CN110581704A (en) * | 2019-09-04 | 2019-12-17 | 华润半导体（深圳）有限公司 | optical coupler |
-
2010
- 2010-07-02 CN CN201020245675XU patent/CN201699683U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694541A (en) * | 2011-03-24 | 2012-09-26 | 海洋王照明科技股份有限公司 | Self-locking loop circuit |
| CN104038203A (en) * | 2013-03-06 | 2014-09-10 | 欣旺达电子股份有限公司 | Optocoupler communication acceleration system |
| CN104038203B (en) * | 2013-03-06 | 2017-04-05 | 欣旺达电子股份有限公司 | Optocoupler communication acceleration system |
| CN106941349A (en) * | 2016-01-05 | 2017-07-11 | 浙江盾安机械有限公司 | A kind of low delay optical coupling isolation circuit and RS485 isolate telecommunication circuit |
| CN105703611A (en) * | 2016-03-11 | 2016-06-22 | 深圳市华星光电技术有限公司 | Voltage feedback circuit of flyback switching power supply and flyback switching power supply |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
| CN110581704A (en) * | 2019-09-04 | 2019-12-17 | 华润半导体（深圳）有限公司 | optical coupler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110105 |
|
| CX01 | Expiry of patent term |