CN201188607Y - Actinoelectricity coupling circuit for boosting of data transmission - Google Patents
Actinoelectricity coupling circuit for boosting of data transmission Download PDFInfo
- Publication number
- CN201188607Y CN201188607Y CNU2008200581936U CN200820058193U CN201188607Y CN 201188607 Y CN201188607 Y CN 201188607Y CN U2008200581936 U CNU2008200581936 U CN U2008200581936U CN 200820058193 U CN200820058193 U CN 200820058193U CN 201188607 Y CN201188607 Y CN 201188607Y
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- triode
- phototriode
- phototransistor
- data transmission
- coupling circuit
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Abstract
A photoelectric coupling circuit used for accelerating data transmission, which comprises a photoelectric coupler, a triode, a diode and a current limiting resistor, wherein, the photoelectric coupler comprises a phototransistor, and the collecting electrode of the phototransistor is connected with the positive electrode of a power supply; the current limiting resistor is connected between the emitting electrode of the phototransistor and the base electrode of the triode; the diode is connected between the emitting electrode of the phototransistor and the collecting electrode of the triode; the emitting electrode of the triode is grounded. By the mode that a simple and effective accelerating circuit is added to the output end of a universal photoelectric coupler with a base electrode lead wire or without a base electrode lead wire, the photoelectric coupling circuit can make the phototransistor operate in an amplification region of the triode when the phototransistor is conducted, and excess charge carriers can not be stored in the PN node of the base electrode, thus the shutoff speed of the photoelectric coupler is increased, and simultaneously, the reshaping of output signals is realized. Therefore, the universal photoelectric coupler can reach high data transmission rate. Simultaneously, compared with high-speed photoelectric coupler, the cost and the price of the photoelectric coupling circuit are largely reduced.
Description
Technical field
The utility model relates to a kind of photoelectricity coupling circuit that is used for the expedited data transmission.
Background technology
In the various signal circuits that need electrical isolation, optocoupler is the most frequently used isolating device.The kind of optocoupler is a lot, mainly contains universal (two kinds of no base lead and base leads), Darlington type, Schmidt's type, high-speed type, light controllable silicon, light field effect pipe etc.Universal optocoupler as shown in Figure 1, inside only is made up of two kinds of elements, is respectively light-emitting diode and phototriode.This optocoupler is because simple in structure, and cost is very low, therefore is widely used in the transmission and the low speed data transmission of Switching Power Supply feedback loop, control signal.When transmission of digital signals, typical photoelectric coupled circuit is because phototriode is in saturation condition when conducting (lumination of light emitting diode), the rise time of output waveform is very long, as shown in Figure 2, store excess in the PN junction of base stage, light-emitting diode stop luminous after, phototriode must be waited until that the charge carrier of base stage extracts and finishes and could turn-off.Therefore the message transmission rate of general optocoupler is very low, can only reach 5-10kbps usually.High speed photo coupling at light receiving part except light receiving element, circuit such as signal amplification, shaping have also been increased, though high speed photo coupling can reach the above message transmission rate of 10Mbps, with respect to general optocoupler, the cost and price of high speed photo coupling will increase a lot.
The utility model content
The purpose of this utility model is, a kind of photoelectricity coupling circuit that is used for the expedited data transmission is provided, and is low to overcome existing universal optocoupler message transmission rate, and the very high shortcoming of high speed photo coupling cost.
A kind of photoelectricity coupling circuit that is used for the expedited data transmission, comprise: optocoupler, triode, diode and current-limiting resistance, described optocoupler comprises phototriode, the collector electrode of described phototriode links to each other with the positive pole of power supply, described current-limiting resistance is connected between the base stage of the emitter of described phototriode and described triode, described diode is connected between the collector electrode of the emitter of described phototriode and described triode, the grounded emitter of described triode.
As a kind of improvement of the present utility model, also be connected with a resistance between the emitter of described phototriode and the emitter of described triode.
As another improvement of the present utility model, also be connected with resistance to earth between the base stage of described phototriode and the ground.
Wherein, described phototriode is a bipolar transistor.
Wherein, described triode is a bipolar transistor.
The utility model is by increasing a simple and effective accelerating circuit at the output that base lead is arranged or do not have a general optocoupler of base lead, can make phototriode when conducting, be operated in the amplification region of triode, can not store excess in the PN junction of base stage, improved the turn-off speed of optocoupler, realize the shaping of output signal simultaneously, thereby make general optocoupler can reach higher message transmission rate.Even do not needing the more occasion of high transfer rate, use the utility model to be used for after the photoelectricity coupling circuit of expedited data transmission, also can make the square-wave waveform of output better than original, improve the reliability of communication; With respect to high speed photo coupling, its cost and price reduces greatly simultaneously.
Description of drawings
Fig. 1 is the typical circuit of general optocoupler;
Fig. 2 is the waveform of typical circuit oscilloscope output;
Fig. 3 is circuit theory diagrams of the present utility model;
Fig. 4 is the waveform of the utility model oscilloscope output;
Fig. 5 is the second embodiment schematic diagram of the present utility model;
Fig. 6 is the 3rd an embodiment schematic diagram of the present utility model.
Embodiment
Embodiment one
As shown in Figure 3, a kind of photoelectricity coupling circuit that is used for the expedited data transmission, comprise: optocoupler U1, triode Q1, diode D1 and current-limiting resistance R3, described optocoupler U1 comprises phototriode, the collector electrode of described phototriode links to each other with the anodal Vcc of power supply, the emitter of described phototriode is linked the base stage of described triode Q1 by described current-limiting resistance R3, described diode D1 is connected between the collector electrode of the emitter of described phototriode and described triode Q1, the grounded emitter of described triode Q1.The forward current direction of described diode D1 flows to triode Q1 from phototriode.The collector electrode of described triode is the output of accelerating circuit, is connected to the anodal Vcc of power supply by first resistance R 4.The operation principle of present embodiment one is described below:
At first, described phototriode is operated in its amplification region when conducting, can not store excess in the PN junction of its base stage, and the shutoff of phototriode just can be very fast like this.Owing to be operated in the amplification region, the output voltage swing of phototriode is restricted, and by using described triode Q1 the output voltage swing of phototriode is amplified, to obtain better digital output signal.Described triode Q1 is the same with phototriode among the optocoupler U1, all belongs to bipolar transistor, so triode Q1 will avoid entering the saturation region equally, and the effect of diode D1 just can prevent that triode Q1 from entering the saturation region.Diode D1 prevents that the saturated principle of triode Q1 from being: when triode Q1 was operated in the amplification region, output voltage was controlled at a lower value, was low level, for example 0.4V-1V as long as guarantee output logic; If triode Q1 base current increases, make triode Q1 begin to enter the saturation region, output voltage will reduce, the base current that increases can make the pressure drop of current-limiting resistance R3 two ends increase again, the forward voltage drop of diode D1 increases like this, diode D1 begins forward conduction, and diode D1 conducting will be shunted the base current that flows through current-limiting resistance R3 later, makes triode Q1 can further not enter the saturation region.Because output voltage is controlled at lower level, and because the existence of diode D1, the emitter voltage of phototriode can not rise very near power source voltage Vcc (collector voltage just), and the phototriode in the optocoupler just can not enter the saturation region like this.
By adjusting the resistance value of accelerating circuit, can make this circuit be applicable to different Vcc supply voltages, and high speed photo coupling is because the restriction of inner amplifying circuit can only be used for specific Vcc supply voltage usually.
Fig. 4 is used for the oscilloscope output waveform of the photoelectricity coupling circuit of expedited data transmission for present embodiment, as can be seen from the figure, adopt accelerating circuit of the present utility model after, the rise time of output waveform obviously shortens.
Embodiment two
As shown in Figure 5, a kind of photoelectricity coupling circuit that is used for the expedited data transmission, it is on the basis of embodiment one, in optocoupler U1, increase a resistance R 5 between the emitter of the emitter of phototriode and described triode Q1, resistance R 5 mainly contains two effects: the dark current that at first can be used for absorbing phototriode, prevent that dark current from flowing through the base stage of triode Q1, secondly triode Q1 from conducting change over to by the time, resistance R 5 can provide bleed-off circuit for the charge carrier in the triode Q1 base stage PN junction, accelerates the shutoff of triode Q1.
Embodiment three
As shown in Figure 6, a kind of photoelectricity coupling circuit that is used for the expedited data transmission, it adopts the photoelectricity coupling circuit that is used for the expedited data transmission that base lead is arranged on the basis of embodiment one, also be connected with resistance to earth R6 between the base stage of the phototriode of this optocoupler U1 and the ground.
Claims (2)
1, a kind of photoelectricity coupling circuit that is used for the expedited data transmission, comprise: optocoupler, triode, diode and current-limiting resistance, it is characterized in that: described optocoupler comprises phototriode, the collector electrode of described phototriode links to each other with the positive pole of power supply, described current-limiting resistance is connected between the base stage of the emitter of described phototriode and described triode, described diode is connected between the collector electrode of the emitter of described phototriode and described triode, the grounded emitter of described triode; Also be connected with a resistance between the emitter of phototriode and the emitter of triode; Also be connected with resistance to earth between the base stage of phototriode and the ground.
2, the photoelectricity coupling circuit that is used for the expedited data transmission according to claim 1, it is characterized in that: described phototriode and triode are bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200581936U CN201188607Y (en) | 2008-05-08 | 2008-05-08 | Actinoelectricity coupling circuit for boosting of data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200581936U CN201188607Y (en) | 2008-05-08 | 2008-05-08 | Actinoelectricity coupling circuit for boosting of data transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201188607Y true CN201188607Y (en) | 2009-01-28 |
Family
ID=40311628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200581936U Expired - Lifetime CN201188607Y (en) | 2008-05-08 | 2008-05-08 | Actinoelectricity coupling circuit for boosting of data transmission |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201188607Y (en) |
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2008
- 2008-05-08 CN CNU2008200581936U patent/CN201188607Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI RUIPU INFORMATION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SHANGHAI JUXIN ELECTRONIC TECHNOLOGY CO., LTD. Effective date: 20141229 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200433 YANGPU, SHANGHAI TO: 200093 YANGPU, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20141229 Address after: 200093 404E room, No. 301 Shuangyang Road, Shanghai, Yangpu District Patentee after: Shanghai Ruipu Mdt InfoTech Ltd Address before: 200433, room 5, building 128, No. 206 Xiang Yin Road, Shanghai, Yangpu District Patentee before: Shanghai Juxin Electronic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090128 |
|
| CX01 | Expiry of patent term |