CN207782768U - The optical coupling isolation circuit of serial communication - Google Patents
The optical coupling isolation circuit of serial communication Download PDFInfo
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- CN207782768U CN207782768U CN201721871860.8U CN201721871860U CN207782768U CN 207782768 U CN207782768 U CN 207782768U CN 201721871860 U CN201721871860 U CN 201721871860U CN 207782768 U CN207782768 U CN 207782768U
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- transmitting
- isolation circuit
- interface
- photoelectrical coupler
- reception
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Abstract
The utility model provides a kind of optical coupling isolation circuit of serial communication, it is easy when solving prior art communication by technical problems such as electromagnetic interferences.The optical coupling isolation circuit of this serial communication, it includes transmitting photoelectrical coupler to emit isolation circuit, it includes receiving photoelectrical coupler to receive isolation circuit, transmitting positive input is connected with the OUT pins of level switch module, transmitting reverse input end is connected with internal emission interface, emit the first output end with external power supply to be connected, transmitting second output terminal is connected with external receiving interface, and transmitting third output end is connected with external ground end；Positive input is received with external power supply to be connected, reverse input end is received with external emission interface to be connected, it receives the first output end with the OUT pins of level switch module to be connected, receives second output terminal and be connected with internal receipt interface, receive third output end and be connected with inner ground end.Advantage is：The electromagnetic interference that serial communication is subject to can be reduced, isolation effect is good.
Description
Technical field
The utility model belongs to isolation circuit technical field, more particularly, to a kind of optical coupling isolation circuit of serial communication.
Background technology
Serial communication refers to the serial of data between main frame and peripheral hardware and between host system and host system
Transmission.Using a data line, one ground of data is transmitted successively, it is long that each data occupies a regular time
Degree.It only needs several lines that can exchange information between system, especially suitable for computer and computer, computer with
Telecommunication between peripheral hardware.But existing serial communication is not provided with isolation circuit, when communication, is easy by electromagnetism
Interference.
Invention content
The purpose of this utility model can be reduced serial in view of the above-mentioned problems, provide a kind of reasonable design, simple in structure
Communicate the optical coupling isolation circuit of the serial communication for the electromagnetic interference being subject to.
In order to achieve the above objectives, the utility model uses following technical proposal：The optical coupling isolation circuit of this serial communication,
Including the transmitting isolation circuit being set between internal emission interface and external receiving interface, and it is set to internal receipt interface
Reception isolation circuit between external emission interface, the transmitting isolation circuit includes transmitting photoelectrical coupler, described
It includes receiving photoelectrical coupler to receive isolation circuit, the transmitting positive input and level conversion of the transmitting photoelectrical coupler
The OUT pins of module are connected, and the transmitting reverse input end of the transmitting photoelectrical coupler is connected with internal emission interface, described
The first output end of transmitting of transmitting photoelectrical coupler be connected with external power supply, the transmitting second of the transmitting photoelectrical coupler
Output end is connected with external receiving interface, the transmitting third output end and external ground end phase of the transmitting photoelectrical coupler
Even；The reception positive input of the reception photoelectrical coupler is connected with external power supply, the reception photoelectrical coupler
It receives reverse input end with external emission interface to be connected, the first output end of reception of the reception photoelectrical coupler turns with level
The OUT pins for changing the mold block are connected, and the reception second output terminal of the reception photoelectrical coupler is connected with internal receipt interface, institute
The reception third output end for the reception photoelectrical coupler stated is connected with inner ground end.
In the optical coupling isolation circuit of above-mentioned serial communication, the emitter of the transmitting reverse input end and triode
It is connected, the base stage of the triode is connected with internal emission interface, collector and the signal ground end phase of the triode
Even.
In the optical coupling isolation circuit of above-mentioned serial communication, it is connected between external receiving interface and external ground end
First filter capacitor is connected with the second filter capacitor between internal receiving interface and inner ground end.
In the optical coupling isolation circuit of above-mentioned serial communication, between transmitting positive input and transmitting reverse input end
It is connected with third filter capacitor, the 4th filter capacitor is connected between receiving positive input and receiving reverse input end.
In the optical coupling isolation circuit of above-mentioned serial communication, emitting between the first output end and transmitting second output terminal
It is connected with first resistor, second resistance is connected between receiving the first output end and receiving second output terminal.
In the optical coupling isolation circuit of above-mentioned serial communication, in the OUT of transmitting positive input and level switch module
It is connected with 3rd resistor between pin, the 4th resistance is connected between positive input and external power supply receiving.
In the optical coupling isolation circuit of above-mentioned serial communication, connect between transmitting second output terminal and external receiving interface
It is connected to the 5th resistance, the 6th resistance is connected between second output terminal and internal receipt interface receiving.
It is reversed defeated in OUT pins and the transmitting of level switch module in the optical coupling isolation circuit of above-mentioned serial communication
Enter end between be connected with the 7th resistance and the first light emitting diode being serially connected, the OUT pins of level switch module with connect
It is connected with the 8th resistance and the second light emitting diode being serially connected between receipts second output terminal.
In the optical coupling isolation circuit of above-mentioned serial communication, the internal emission interface passes through the first TVS pipe and letter
Number ground terminal is connected, and the internal receipt interface is connected by the second TVS pipe with signal ground end.
In the optical coupling isolation circuit of above-mentioned serial communication, the external power supply and external ground end respectively with DCDC
The power input pin of power conversion module is connected with ground connection input pin, and internal electric source and inner ground end are respectively by DCDC electricity
The power supply output pin of source conversion module and ground connection output pin output, the power supply output of the DCDC power conversion modules are drawn
Foot is connected with the IN pins of level switch module, ground connection output pin and the level conversion mould of the DCDC power conversion modules
The GND pin of block is connected, and two OUT pins of the level switch module are connected with each other, between IN pins and GND pin
It is connected with the 5th filter capacitor, the 6th filter capacitor is connected between OUT pins and GND pin.
Compared with prior art, the advantages of optical coupling isolation circuit of this serial communication, is：
1, the electromagnetic interference that serial communication is subject to can be reduced, isolation effect is good；
2, emit photoelectrical coupler and receive photoelectrical coupler and select high speed photo coupling, serial communication rate can be met and wanted
It asks；
3, the first light emitting diode and the second light emitting diode are respectively intended to instruction and send and receive signal, and debugging is facilitated to see
It examines；
4, when the first TVS pipe and the second TVS pipe are for preventing static discharge or hot plugging, internal emission interface and interior
The voltage-to-ground of portion's receiving interface exceeds safe range, it is made to have certain hot plug ability.
Description of the drawings
Fig. 1 provides the circuit diagram of the utility model.
In figure, transmitting photoelectrical coupler 1, transmitting positive input 11, transmitting reverse input end 12, the first output end of transmitting
13, emit second output terminal 14, transmitting third output end 15, receive photoelectrical coupler 2, receive positive input 21, receive it is anti-
To input terminal 22, receive the first output end 23, receive second output terminal 24, receive third output end 25, level switch module 3,
It is internal emission interface TX, internal receipt interface RX, external emission interface TXL, external receiving interface RXL, external power supply VCCL, outer
Portion ground terminal GNDL, internal electric source VCC, inner ground end DGND, triode 4, the first light emitting diode 41, the second light-emitting diodes
Pipe 42, the first TVS pipe 43, the second TVS pipe 44, the first filter capacitor 51, the second filter capacitor 52, third filter capacitor 53,
Four filter capacitors 54, the 5th filter capacitor 55, the 6th filter capacitor 56, first resistor 61, second resistance 62,3rd resistor 63,
4th resistance 64, the 5th resistance 65, the 6th resistance 66, the 7th resistance 67, the 8th resistance 68, signal ground end 7, DCDC power supplys turn
Change the mold block 8.
Specific implementation mode
The technical issues of in order to keep the utility model solved, technical solution and advantageous effect are more clearly understood, below
The utility model is described further with reference to the drawings and specific embodiments, but the utility model is not limited to described implementation
Example, on the contrary, the utility model includes whole modifications, modification and the equivalent fallen within the scope of the appended claims.
As shown in Figure 1, the optical coupling isolation circuit of this serial communication, including be set to internal emission interface TX and received with external
Transmitting isolation circuit between interface RXL, and the reception that is set between internal receipt interface RX and external emission interface TXL
Isolation circuit, transmitting isolation circuit include transmitting photoelectrical coupler 1, and it includes receiving photoelectrical coupler 2 to receive isolation circuit, transmitting
The transmitting positive input 11 of photoelectrical coupler 1 is connected with the OUT pins of level switch module 3, emits the hair of photoelectrical coupler 1
It penetrates reverse input end 12 with internal emission interface TX to be connected, emits the first output end of transmitting 13 and external electrical of photoelectrical coupler 1
Source VCCL is connected, and the transmitting second output terminal 14 of transmitting photoelectrical coupler 1 is connected with outside receiving interface RXL, emits photoelectricity coupling
The transmitting third output end 15 of clutch 1 is connected with external ground end GNDL；Receive the reception positive input 21 of photoelectrical coupler 2
It is connected with external power supply VCCL, the reception reverse input end 22 for receiving photoelectrical coupler 2 is connected with external emission interface TXL, connects
The first output end of reception 23 for receiving photoelectrical coupler 2 is connected with the OUT pins of level switch module 3, receives photoelectrical coupler 2
Reception second output terminal 24 be connected with internal receipt interface RX, receive photoelectrical coupler 2 reception third output end 25 with it is interior
Portion ground terminal DGND is connected；Transmitting reverse input end 12 is connected with the emitter of triode 4, and the base stage of triode 4 is sent out with internal
It penetrates interface TX to be connected, the base stage of triode 4 is preferably connected by the 9th resistance with internal emission interface TX, the collection of triode 4
Electrode is connected with signal ground end 7.The electromagnetic interference that serial communication is subject to can be reduced, isolation effect is good；Emit photoelectric coupling
Device 1 and reception photoelectrical coupler 2 select high speed photo coupling, can meet serial communication rate requirement.
The first filter capacitor 51 is connected between external receiving interface RXL and external ground end GNDL, in internal receipt
The second filter capacitor 52 is connected between interface RX and inner ground end DGND；It is reversed defeated with transmitting in transmitting positive input 11
Enter and be connected with third filter capacitor 53 between holding 12, is connected between receiving positive input 21 and receiving reverse input end 22
There is the 4th filter capacitor 54；It is connected with first resistor 61 between the first output end 13 and transmitting second output terminal 14 emitting,
It receives and is connected with second resistance 62 between the first output end 23 and reception second output terminal 24；Transmitting positive input 11 with
Be connected with 3rd resistor 63 between the OUT pins of level switch module 3, receive positive input 21 and external power supply VCCL it
Between be connected with the 4th resistance 64；It is connected with the 5th resistance 65 between transmitting second output terminal 14 and external receiving interface RXL,
It receives and is connected with the 6th resistance 66 between second output terminal 24 and internal receipt interface RX.
It is connected with the 7th electricity being serially connected between the OUT pins and transmitting reverse input end 12 of level switch module 3
Resistance 67 and the first light emitting diode 41 are connected with phase between the OUT pins and reception second output terminal 24 of level switch module 3
Mutual concatenated 8th resistance 68 and the second light emitting diode 42.First light emitting diode 41 and the second light emitting diode 42 are used respectively
It indicates to send and receive signal, debugging is facilitated to observe.
Internal emission interface TX is connected by the first TVS pipe 43 with signal ground end 7, and internal receipt interface RX passes through second
TVS pipe 44 is connected with signal ground end 7.First TVS pipe 43 and the second TVS pipe 44 are for preventing static discharge or with electric mortiser
When pulling out, the voltage-to-ground of internal emission interface TX and internal receipt interface RX exceed safe range, so that it is had certain heat and insert
Pull out ability.
External power supply VCCL and external ground end GNDL respectively with the power input pin of DCDC power conversion modules 8 and
It is grounded input pin to be connected, internal electric source VCC and inner ground end DGND are exported by the power supply of DCDC power conversion modules 8 respectively
Pin and ground connection output pin output, the power supply output pin of DCDC power conversion modules 8 and the IN pins of level switch module 3
It is connected, the ground connection output pin of DCDC power conversion modules 8 is connected with the GND pin of level switch module 3, level switch module
3 two OUT pins are connected with each other, and the 5th filter capacitor 55 is connected between IN pins and GND pin, OUT pins with
The 6th filter capacitor 56 is connected between GND pin.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Although transmitting photoelectrical coupler 1, transmitting positive input 11, transmitting reverse input end is used more herein
12, emit the first output end 13, transmitting second output terminal 14, transmitting third output end 15, receive photoelectrical coupler 2, receive just
To input terminal 21, receive reverse input end 22, the first output end 23 of reception, reception second output terminal 24, reception third output end
25, level switch module 3, internal emission interface TX, internal receipt interface RX, external emission interface TXL, external receiving interface
RXL, external power supply VCCL, external ground end GNDL, internal electric source VCC, inner ground end DGND, triode 4, first luminous two
Pole pipe 41, the second light emitting diode 42, the first TVS pipe 43, the second TVS pipe 44, the first filter capacitor 51, the second filter capacitor
52, third filter capacitor 53, the 4th filter capacitor 54, the 5th filter capacitor 55, the 6th filter capacitor 56, first resistor 61,
Two resistance 62,3rd resistor 63, the 4th resistance 64, the 5th resistance 65, the 6th resistance 66, the 7th resistance 67, the 8th resistance 68,
The terms such as signal ground end 7, DCDC power conversion modules 8, but it does not preclude the possibility of using other terms.Use these
Term is used for the purpose of more easily describing and explaining the essence of the utility model；It is construed as the additional limit of any type
System is all contrary to the spirit of the present invention.
Claims (10)
1. a kind of optical coupling isolation circuit of serial communication, including it is set to internal emission interface (TX) and external receiving interface
(RXL) the transmitting isolation circuit between, and it is set to connecing between internal receipt interface (RX) and external emission interface (TXL)
Isolation circuit is received, the transmitting isolation circuit includes transmitting photoelectrical coupler (1), and the reception isolation circuit includes receiving
Photoelectrical coupler (2), which is characterized in that the transmitting positive input (11) of the transmitting photoelectrical coupler (1) turns with level
The OUT pins for changing the mold block (3) are connected, the transmitting reverse input end (12) and internal emission of the transmitting photoelectrical coupler (1)
Interface (TX) is connected, and the first output end of transmitting (13) of the transmitting photoelectrical coupler (1) is connected with external power supply (VCCL),
The transmitting second output terminal (14) of the transmitting photoelectrical coupler (1) is connected with external receiving interface (RXL), the transmitting
The transmitting third output end (15) of photoelectrical coupler (1) is connected with external ground end (GNDL)；The reception photoelectrical coupler
(2) reception positive input (21) is connected with external power supply (VCCL), and the reception of the reception photoelectrical coupler (2) is reversed
Input terminal (22) is connected with external emission interface (TXL), the first output end of reception (23) of the reception photoelectrical coupler (2)
Be connected with the OUT pins of level switch module (3), the reception second output terminal (24) of the reception photoelectrical coupler (2) with
Internal receipt interface (RX) is connected, reception third output end (25) and the inner ground end of the reception photoelectrical coupler (2)
(DGND) it is connected.
2. the optical coupling isolation circuit of serial communication according to claim 1, which is characterized in that the transmitting reversely inputs
End (12) is connected with the emitter of triode (4), and the base stage of the triode (4) is connected with internal emission interface (TX), institute
The collector for the triode (4) stated is connected with signal ground end (7).
3. the optical coupling isolation circuit of serial communication according to claim 2, which is characterized in that in external receiving interface
(RXL) it is connected with the first filter capacitor (51) between external ground end (GNDL), is connect with inside in internal receiving interface (RX)
The second filter capacitor (52) is connected between ground terminal (DGND).
4. the optical coupling isolation circuit of serial communication according to claim 3, which is characterized in that in transmitting positive input
(11) it is connected with third filter capacitor (53) between transmitting reverse input end (12), is receiving positive input (21) and is receiving
The 4th filter capacitor (54) is connected between reverse input end (22).
5. the optical coupling isolation circuit of serial communication according to claim 4, which is characterized in that emitting the first output end
(13) it is connected with first resistor (61) between transmitting second output terminal (14), is receiving the first output end (23) and is receiving second
Second resistance (62) is connected between output end (24).
6. the optical coupling isolation circuit of serial communication according to claim 5, which is characterized in that in transmitting positive input
(11) 3rd resistor (63) is connected between the OUT pins of level switch module (3), in reception positive input (21) and outside
The 4th resistance (64) is connected between portion's power supply (VCCL).
7. the optical coupling isolation circuit of serial communication according to claim 6, which is characterized in that in transmitting second output terminal
(14) it is connected with the 5th resistance (65) between external receiving interface (RXL), is receiving second output terminal (24) and internal receipt
The 6th resistance (66) is connected between interface (RX).
8. according to the optical coupling isolation circuit of claim 1-7 any one of them serial communications, which is characterized in that in level conversion
It is connected with the 7th resistance (67) being serially connected and the first hair between the OUT pins and transmitting reverse input end (12) of module (3)
Optical diode (41) is connected between the OUT pins and reception second output terminal (24) of level switch module (3) and is serially connected
The 8th resistance (68) and the second light emitting diode (42).
9. according to the optical coupling isolation circuit of claim 1-7 any one of them serial communications, which is characterized in that the inside
Emission interface (TX) is connected by the first TVS pipe (43) with signal ground end (7), and the internal receipt interface (RX) passes through
Two TVS pipes (44) are connected with signal ground end (7).
10. according to the optical coupling isolation circuit of claim 1-7 any one of them serial communications, which is characterized in that described is outer
Portion's power supply (VCCL) and external ground end (GNDL) are defeated with the power input pin of DCDC power conversion modules (8) and ground connection respectively
Enter pin to be connected, internal electric source (VCC) and inner ground end (DGND) are exported by the power supply of DCDC power conversion modules (8) respectively
Pin and ground connection output pin output, the power supply output pin and level switch module of the DCDC power conversion modules (8)
(3) IN pins are connected, the GND of the ground connection output pin and level switch module (3) of the DCDC power conversion modules (8)
Pin is connected, and two OUT pins of the level switch module (3) are connected with each other, and are connected between IN pins and GND pin
There is the 5th filter capacitor (55), the 6th filter capacitor (56) is connected between OUT pins and GND pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721871860.8U CN207782768U (en) | 2017-12-27 | 2017-12-27 | The optical coupling isolation circuit of serial communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721871860.8U CN207782768U (en) | 2017-12-27 | 2017-12-27 | The optical coupling isolation circuit of serial communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207782768U true CN207782768U (en) | 2018-08-28 |
Family
ID=63225199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721871860.8U Expired - Fee Related CN207782768U (en) | 2017-12-27 | 2017-12-27 | The optical coupling isolation circuit of serial communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207782768U (en) |
-
2017
- 2017-12-27 CN CN201721871860.8U patent/CN207782768U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180828 Termination date: 20201227 |