CN110417400A - A kind of isolation communicating circuit, system and method - Google Patents
A kind of isolation communicating circuit, system and method Download PDFInfo
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- CN110417400A CN110417400A CN201910641551.9A CN201910641551A CN110417400A CN 110417400 A CN110417400 A CN 110417400A CN 201910641551 A CN201910641551 A CN 201910641551A CN 110417400 A CN110417400 A CN 110417400A
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- 230000008878 coupling Effects 0.000 claims abstract description 96
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- 230000003287 optical effect Effects 0.000 claims abstract description 96
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- 238000004891 communication Methods 0.000 claims description 30
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
- H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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Abstract
This application discloses a kind of isolation communicating circuit, system and method, the isolation communicating circuit includes: signal sending end, for inputting the transmission signal of first device；The primary side of first optical coupling isolator, the first optical coupling isolator is connect with signal sending end；First isolation module, between signal sending end and the primary side of the first optical coupling isolator；Signal port component is connect with the secondary side of the first optical coupling isolator, including multiple signal connection ends, for being attached with second device；Second isolation module, between the secondary side and signal port component of the first optical coupling isolator；The primary side of second optical coupling isolator, the second optical coupling isolator is connect with signal port component, the second isolation module；And signal receiving end, it is connect with the secondary side of the second optical coupling isolator, for exporting the output signal of second device.The embodiment of the present application can effectively improve the interference free performance of isolation communicating circuit.
Description
Technical field
This application involves domain of communication equipment, in particular to a kind of isolation communicating circuit, system and method.
Background technique
With the increase in demand that intelligent product designs, function intensified and internet cloud calculates the application of database, just
Need between intellectual product and other intellectual products, carry out data exchange between intellectual product and equipment, and the rate that communicates and
Stability directly affects the performance and user experience effect of intellectual product, can be very good to solve using isolation communicating circuit design
The problem of rate and stability, anti-interference；
Existing isolation communicating circuit is to be connect by directly connecting with product communication interface optical coupling isolator using product communication
Mouthful control voltage directly drive the primary side of optical coupling isolator, and output a signal to one by the secondary side of the optical coupling isolator
Signal port.
Although certain communication buffer action can be played using optical coupling isolator, for the requirement of certain communication qualities
In higher system, existing isolation communicating circuit still has the problem of interference free performance deficiency.
Summary of the invention
The application provides a kind of isolation communicating circuit, system and method, and the anti-interference of isolation communicating circuit can be improved
Energy.
The embodiment of the present application provides a kind of isolation communicating circuit, applied to the company between first device and second device
News are connected, the isolation communicating circuit includes:
Signal sending end, for inputting the transmission signal of the first device；
The primary side of first optical coupling isolator, first optical coupling isolator is connect with the signal sending end；
First isolation module, between the signal sending end and the primary side of first optical coupling isolator；
Signal port component is connect with the secondary side of first optical coupling isolator, including multiple signal connection ends, for it is described
Second device is attached；
Second isolation module, between the secondary side and the signal port component of first optical coupling isolator；
Second optical coupling isolator, the primary side of second optical coupling isolator and the signal port component, second isolation mode
Block connection；And
Signal receiving end is connect, for exporting the output signal of the second device with the secondary side of second optical coupling isolator.
Optionally, first isolation module, comprising:
First switch transistor, control terminal are connect by first resistor with the signal sending end, driving end and described first
The primary side of optical coupling isolator connects；
Wherein, the first switch transistor is switching transistor or switch metal-oxide-semiconductor.
Optionally, the first switch transistor be switching transistor, first isolation module further include input power,
Second resistance and first capacitor；
The base stage of the first switch transistor is connect with the first resistor, the original of collector and first optical coupling isolator
The anode connection on side, emitter are connect with the cathode of the primary side of first optical coupling isolator；
Anode of the input power in the collector of the first switch transistor and the primary side of first optical coupling isolator
Between be in series with a pull-up resistor；
The second resistance is in parallel with the primary side of first optical coupling isolator with first capacitor.
Optionally, second isolation module, comprising:
Second switch transistor, control terminal are connect with the secondary side of first optical coupling isolator, and driving end is connected to the letter
Number port assembly and with reference between ground and between the primary side of second optical coupling isolator；
Wherein, the second switch transistor is switching transistor or switch metal-oxide-semiconductor.
Optionally, the second switch transistor is switching transistor；
The base stage of the second switch transistor is connected by the emitter on 3rd resistor and the secondary side of first optical coupling isolator
It connects, collector is connect with the signal port component, and emitter is connect with reference.
Optionally, the signal port component includes first port and second port and third port, in which:
The first port is connect by 3rd resistor with the collector of the second switch transistor；
The second port is connected to one end of the 4th resistance, the other end of the 4th resistance by the first protection diode with
The collector of the second switch transistor connects, and connect with the collector on the secondary side of first optical coupling isolator；
The third port is connect with reference；
The anode of first protection diode is connect with one end of the 4th resistance, cathode and the second switch transistor
Collector connection.
Optionally, second isolation module further include:
Second protection diode, anode are connected between the collector and the 3rd resistor of the second switch transistor,
Cathode is connected to the emitter of the second switch transistor and with reference between ground.
Optionally, the 5th resistance and second are also parallel between the collector and emitter of the second switch transistor
Capacitor.
The embodiment of the present application also discloses a kind of isolation communication system, comprising:
First device；
Second device, including PORT COM；And
Communicating circuit is isolated, is set between the first device and the second device, wherein the isolation communicating circuit is such as
Isolation communicating circuit described in upper any one；
The signal sending end of the isolation communicating circuit connect the first device, the isolation communicating circuit with signal receiving end
Signal port component connect the PORT COM.
The embodiment of the present application also discloses a kind of isolation means of communication, is applied to above-described isolation communication system, institute
The method of stating includes:
When first device transmits signal to second device, the transmission signal passes through the first isolation module, the first light-coupled isolation
Device, the second isolation module and signal port component are transferred to the second device；
When the second device transmits signal to the first device, the second device will be described by the PORT COM
The first port of signal port component is placed in low level；The output signal is transferred to described first by the second optical coupling isolator
Device.
From the foregoing, it will be observed that isolation communicating circuit, system and method in the application, do not use only optical coupling isolator conduct
Signal isolation means, and also realized by the first isolation module, the second isolation module and its mutual circuit design into one
The signal isolation of step effectively improves the interference free performance of isolation communicating circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of isolation communicating circuit provided by the embodiments of the present application.
Fig. 2 is another structural schematic diagram of isolation communicating circuit provided by the embodiments of the present application.
Fig. 3 is the structural schematic diagram of isolation communication system provided by the embodiments of the present application.
Fig. 4 is the implementation flow chart of the isolation means of communication provided by the embodiments of the present application.
Specific embodiment
The preferred embodiment of the application is described in detail with reference to the accompanying drawing so that the advantages of the application and feature more
It is easily readily appreciated by one skilled in the art, to make apparent define to the protection scope of the application.
Referring to Fig. 1, showing the structure of isolation communicating circuit provided by the embodiments of the present application in figure.
Wherein, which is applied to the connecting communication between first device and second device.Specifically, should
First device and second device can refer to independent EM equipment module, such as with independent process, the battery pack of ability to communicate
Deng may also mean that a certain circuit module with communication function, such as the circuit with MCU processing unit.The first device
And the particular content of second device can be selected according to the actual situation, the embodiment of the present application is not construed as limiting this.
As shown in Figure 1, the isolation communicating circuit includes signal sending end 10, the first optical coupling isolator 30, the first isolation mode
Block 20, signal port component 50, the second isolation module 40, the second optical coupling isolator 60 and signal receiving end 70.
The signal sending end 10, for inputting the transmission signal of first device.Wherein, which can access
To the transmitting terminal of first device, which can will send signal by the signal sending end 10 and be input to isolation communication electricity
Road.
The primary side of first optical coupling isolator 30/U1, first optical coupling isolator 30/U1 are connect with signal sending end 10；The
One isolation module 20, between signal sending end 10 and the primary side of the first optical coupling isolator 30/U1.Wherein, the transmission signal
It is transmitted to the primary side of the first optical coupling isolator 30 by first isolation module 20, is made using the isolation of first isolation module 20
With avoiding the first optical coupling isolator 30/U1 from being directly connected with signal sending end 10, preferably protect the first optical coupling isolator 30/
U1。
Referring to Fig. 2, showing another structure of isolation communicating circuit provided by the embodiments of the present application in figure.
Specifically, control terminal passes through the as shown in Fig. 2, first isolation module 20 includes first switch transistor Q1
One resistance R1 is connect with signal sending end 10, and driving end is connect with the primary side of the first optical coupling isolator 30/U1.Wherein, this first
Switching transistor Q1 is switching transistor or switch metal-oxide-semiconductor.Using first switch transistor Q1 as the element of isolation module,
Not only signal isolation can be played the role of by the characteristic of switching transistor, but also can be enhanced to the first optical coupling isolator
The driving capability of 30/U1 improves the switching rate of the first optical coupling isolator 30/U1.
In some embodiments, which is switching transistor, which further includes
Input power VCC, second resistance R2 and first capacitor C1；
The base stage of first switch transistor Q1 is connect with first resistor R1, the primary side of collector and the first optical coupling isolator 30
Anode connection, emitter are connect with the cathode of the primary side of the first optical coupling isolator 30；The input power is in first switch transistor
A pull-up resistor is in series between the anode of the primary side of the collector of Q1 and the first optical coupling isolator 30；Second resistance R2 and first
Capacitor C1 is in parallel with the primary side of the first optical coupling isolator 30.
In real work, when signal sending end 10TX exports high level, signal is opened by first resistor R1 driving first
Transistor Q1 is closed, first switch transistor Q1 work is connected and exports low level, ends the primary side of optical coupling isolator U1.Work as letter
When number transmitting terminal 10TX output low level, signal drives first switch transistor Q1, first switch crystal by first resistor R1
Pipe Q1 work cut-off output high level, high level signal make the primary side ON operation of optical coupling isolator U1 by pull-up resistor, into
And the secondary side of optical coupling isolator U1 is connected.
Signal port component 50 is connect with the secondary side of the first optical coupling isolator 30/U1, including multiple signal connection ends, is used
It is attached in second device；Second isolation module 40, secondary side and signal port group set on the first optical coupling isolator 30/U1
Between part 50.
Wherein, which can be used for connecting the PORT COM of second device, the signal port component 50
Specific implementation form can according to the actual situation depending on, such as use the port 3PIN or more PIN port assemblies 50, the application couple
This is not construed as limiting.
Specifically, as shown in Fig. 2, second isolation module 40, including second switch transistor Q2, control terminal and first
The secondary side of optical coupling isolator 30/U1 connects, and driving end is connected between signal port component 50 and reference ground and the second optocoupler
Between the primary side of isolator 60.Wherein, which is switching transistor or switch metal-oxide-semiconductor.
During the transmission signal is transferred to signal port component 50 by the secondary side of the first optical coupling isolator 30, pass through
Second isolation module 40 can carry out the isolation again of signal, play the role of further enhancing anti-jamming effectiveness.
In some embodiments, which is switching transistor；The base of second switch transistor Q2
Pole is connect by second resistance with the emitter on the secondary side of the first optical coupling isolator 30, and collector and signal port component 50 connect
It connects, emitter is connect with reference.
The signal level exported by the secondary side of the first optical coupling isolator 30, can control second switch transistor Q2's
On or off, to drive 50 output signal of signal port component.
More specifically, which includes first port P1-1 and second port P1-2 and third port
P1-3, in which:
First port P1-1 is connect by 3rd resistor with the collector of second switch transistor Q2；Second port P1-2 connects
It is connected to one end of the 4th resistance, the other end of the 4th resistance passes through the collection of the first protection diode and second switch transistor Q2
Electrode connection, and connect with the collector on the secondary side of the first optical coupling isolator 30；Third port P1-3 is connect with reference；It should
The anode of first protection diode is connect with one end of the 4th resistance, and cathode is connect with the collector of second switch transistor Q2.
In addition, being also parallel with the 5th resistance and the second electricity between the collector and emitter of second switch transistor Q2
Hold, so that the course of work of second switch transistor Q2 is more stable, reliable.
In real work, when the first optical coupling isolator 30 is connected namely signal sending end 10 is low level, secondary side is defeated
High level drives the base stage of second switch transistor Q2 to be connected out, at this time the first port P1-1 inspection in signal port component 50
Measure low level signal；When the cut-off of the first optical coupling isolator 30 namely signal sending end 10 are high level, second switch is brilliant
Body pipe Q2 is in off state, and first port P1-1 can detecte high level signal at this time.It is moved towards by above-mentioned signal
Mode can complete first device and transmit to the signal of second device.
The circuit connecting mode of above-mentioned second isolation module 40 not only may insure first optocoupler in isolation communicating circuit
Isolation effect between isolator 30 and signal port component 50, and signal fan-out capability and transmission speed can be enhanced.
Second optical coupling isolator 60, the primary side and signal port component 50, the second isolation mode of second optical coupling isolator 60
Block 40 connects.Signal receiving end 70 is connect with the secondary side of the second optical coupling isolator 60, and the output for exporting second device is believed
Number.
It wherein, can be by signal port component 50 through second optocoupler when which needs to send output signal
Isolator 60 is transferred to the signal receiving end 70 in the isolation communicating circuit, and is sent to connect with the signal receiving end 70
One device.
Specifically, the primary side of second optical coupling isolator 60 is parallel with resistance R7 and capacitor C3, the anode of primary side is logical
It crosses the 4th resistance to connect with second port P1-2, cathode is connect by 3rd resistor with first port P1-1, and and second switch
The collector of transistor Q2 connects.The collector on the secondary side of second optical coupling isolator 60 is connect with signal receiving end 70, cathode
It connects with reference to ground, also, between the collector and signal receiving end 70 on the secondary side of second optical coupling isolator 60, also passes through resistance R9
It is connect with input power.
In existing isolation communicating circuit, since sending and receiving for signal is two independent communication process, in order to keep away
Exempt to interfere, independent circuit is needed to ensure interference free performance.
To solve the above-mentioned problems, in some embodiments, when second device sends output signal to first device, only
The first port P1-1 of signal port component 50 need to be set to low level, so that second switch transistor Q2 is in off state,
It avoids signal port component 50 from interfering when sending the output signal the first optical coupling isolator 30, promotes the anti-dry of the circuit
Immunity energy.
Also, the transmission of output signal, the output of second port P1-2 can be carried out by second port P1-2 at this time
Signal is sent through the second optical coupling isolator 60, is received the signal of the signal port component 50 and is realized again with sending function
With.
Specifically, first port P1-1 input low level makes the when second device sends output signal to first device
Two switching transistor Q2 cut-off.At this point, the high level signal is by third electricity when second port P1-2 input high level signal
Output low level to signal receives after resistance and the second optical coupling isolator 60/U2, the second optical coupling isolator 60/U2 work conducting
End 70, and it is input to first device；When second port P1-2 input low level signal, which passes through 3rd resistor
And the second optical coupling isolator 60/U2, the second optical coupling isolator 60/U2 cut-off, input power output high level to signal connect
Receiving end 70, and it is input to first device.
It should be understood that all components in the isolation communicating circuit, including optical coupling isolator, resistance, capacitor and
The concrete model of switching transistor can be adjusted according to the actual situation using common element model, and the application is real
It applies example and this is not construed as limiting.
From the foregoing, it will be observed that the isolation communicating circuit in the application, does not use only optical coupling isolator as signal isolation hand
Section, and also by the first isolation module, the second isolation module and its mutual circuit design realize further signal every
From, effectively improve isolation communicating circuit interference free performance.
Referring to Fig. 3, showing the structure of isolation communication system provided by the embodiments of the present application in figure.
As shown in figure 3, the isolation communication system include sequentially connected first device 110, isolation communicating circuit 120 and
Second device 130, wherein the isolation communicating circuit 120 is applied to the connection between first device 110 and second device 130
Communication.Specifically, the first device 110 and second device 130 can refer to independent EM equipment module, such as with independent place
Reason, battery pack of ability to communicate etc. may also mean that a certain circuit module with communication function, such as single with MCU processing
The circuit of member.The first device 110 and the particular content of second device 130 can be selected according to the actual situation, this Shen
Please embodiment this is not construed as limiting.
In order to avoid repeating, specifically describing for the isolation communicating circuit 120 can be with reference to the isolation communication as described in Fig. 1-2
The embodiment of circuit.
Optical coupling isolator is used in the isolation communication system as signal isolation means, and also passes through the first isolation mode
Further signal isolation is realized in block, the second isolation module and its mutual isolation communicating circuit design, is effectively improved
The interference free performance of communicating circuit is isolated.
Referring to Fig. 4, showing the implementation process of the isolation means of communication provided by the embodiments of the present application in figure.
The isolation means of communication be applied to Fig. 3 described in isolation communication system, the isolation communication system include first device,
Second device and isolation communicating circuit.Wherein, which can refer to isolation communicating circuit described in Fig. 1-2.
As shown in figure 4, the isolation means of communication include:
201, first device transmits signal to second device.
202, it sends signal and passes through the first isolation module, the first optical coupling isolator, the second isolation module and signal port
Component is transferred to second device.
Wherein, using the first isolation module and the second isolation module, not only can be improved the first optical coupling isolator and
The transmission rate of signal port component, but also dual resisteance can be played the role of, enhance first in the isolation communication system
Interference free performance of the device into second device communication process improves system stability.
301, second device transmits signal to first device.
302, the first port of signal port component is placed in low level by PORT COM by second device.
303, output signal is transferred to first device by the second optical coupling isolator.
It wherein, can be by exporting low level for the second isolation circuit when the second device needs to send output signal
Ended, avoids interference of the output signal to the first optical coupling isolator, and realize signal isolation using the second optical coupling isolator
Output, enhances interference free performance of the second device into first device communication process.
From the foregoing, it will be observed that the isolation means of communication can effectively improve the interference free performance of isolation communicating circuit.
Presently filed embodiment is explained in detail above in conjunction with attached drawing, but the application is not limited to above-mentioned implementation
Mode within the knowledge of a person skilled in the art can also be under the premise of not departing from the application objective
Various changes can be made.
Claims (10)
1. a kind of isolation communicating circuit, applied to the connecting communication between first device and second device, which is characterized in that institute
Stating isolation communicating circuit includes:
Signal sending end, for inputting the transmission signal of the first device；
The primary side of first optical coupling isolator, first optical coupling isolator is connect with the signal sending end；
First isolation module, between the signal sending end and the primary side of first optical coupling isolator；
Signal port component is connect with the secondary side of first optical coupling isolator, including multiple signal connection ends, for it is described
Second device is attached；
Second isolation module, between the secondary side and the signal port component of first optical coupling isolator；
Second optical coupling isolator, the primary side of second optical coupling isolator and the signal port component, second isolation mode
Block connection；And
Signal receiving end is connect, for exporting the output signal of the second device with the secondary side of second optical coupling isolator.
2. isolation communicating circuit as described in claim 1, which is characterized in that first isolation module, comprising:
First switch transistor, control terminal are connect by first resistor with the signal sending end, driving end and described first
The primary side of optical coupling isolator connects；
Wherein, the first switch transistor is switching transistor or switch metal-oxide-semiconductor.
3. isolation communicating circuit as claimed in claim 2, which is characterized in that the first switch transistor is three pole of switch
Pipe, first isolation module further includes input power, second resistance and first capacitor；
The base stage of the first switch transistor is connect with the first resistor, the original of collector and first optical coupling isolator
The anode connection on side, emitter are connect with the cathode of the primary side of first optical coupling isolator；
Anode of the input power in the collector of the first switch transistor and the primary side of first optical coupling isolator
Between be in series with a pull-up resistor；
The second resistance is in parallel with the primary side of first optical coupling isolator with first capacitor.
4. isolation communicating circuit as described in claim 1, which is characterized in that second isolation module, comprising:
Second switch transistor, control terminal are connect with the secondary side of first optical coupling isolator, and driving end is connected to the letter
Number port assembly and with reference between ground and between the primary side of second optical coupling isolator；
Wherein, the second switch transistor is switching transistor or switch metal-oxide-semiconductor.
5. isolation communicating circuit as claimed in claim 4, which is characterized in that the second switch transistor is three pole of switch
Pipe；
The base stage of the second switch transistor is connected by the emitter on 3rd resistor and the secondary side of first optical coupling isolator
It connects, collector is connect with the signal port component, and emitter is connect with reference.
6. isolation communicating circuit as claimed in claim 5, which is characterized in that the signal port component include first port with
And second port and third port, in which:
The first port is connect by 3rd resistor with the collector of the second switch transistor；
The second port is connected to one end of the 4th resistance, the other end of the 4th resistance by the first protection diode with
The collector of the second switch transistor connects, and connect with the collector on the secondary side of first optical coupling isolator；
The third port is connect with reference；
The anode of first protection diode is connect with one end of the 4th resistance, cathode and the second switch transistor
Collector connection.
7. isolation communicating circuit as claimed in claim 6, which is characterized in that second isolation module further include:
Second protection diode, anode are connected between the collector and the 3rd resistor of the second switch transistor,
Cathode is connected to the emitter of the second switch transistor and with reference between ground.
8. isolation communicating circuit as described in claim 1, which is characterized in that the collector and hair of the second switch transistor
The 5th resistance and the second capacitor are also parallel between emitter-base bandgap grading.
9. a kind of isolation communication system characterized by comprising
First device；
Second device, including PORT COM；And
Communicating circuit is isolated, is set between the first device and the second device, wherein the isolation communicating circuit is power
Benefit requires isolation communicating circuit described in 1-8 any one；
The signal sending end of the isolation communicating circuit connect the first device, the isolation communicating circuit with signal receiving end
Signal port component connect the PORT COM.
10. a kind of isolation means of communication are applied to isolation communication system as claimed in claim 9, which is characterized in that the method
Include:
When first device transmits signal to second device, the transmission signal passes through the first isolation module, the first light-coupled isolation
Device, the second isolation module and signal port component are transferred to the second device；
When the second device transmits signal to the first device, the second device will be described by the PORT COM
The first port of signal port component is placed in low level；The output signal is transferred to described first by the second optical coupling isolator
Device.
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| CN201910641551.9A CN110417400A (en) | 2019-07-16 | 2019-07-16 | A kind of isolation communicating circuit, system and method |
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| CN201910641551.9A CN110417400A (en) | 2019-07-16 | 2019-07-16 | A kind of isolation communicating circuit, system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111404796A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Communication device, communication assembly and vehicle-mounted air conditioner |
| CN113783584A (en) * | 2021-11-11 | 2021-12-10 | 汇智机器人科技(深圳)有限公司 | Isolated single-wire serial communication device and method |
| CN114745224A (en) * | 2022-05-20 | 2022-07-12 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN115037569A (en) * | 2022-06-06 | 2022-09-09 | 无锡市朗迪测控技术有限公司 | LIN bus interface circuit |
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| CN113783584A (en) * | 2021-11-11 | 2021-12-10 | 汇智机器人科技(深圳)有限公司 | Isolated single-wire serial communication device and method |
| CN114745224A (en) * | 2022-05-20 | 2022-07-12 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN114745224B (en) * | 2022-05-20 | 2023-11-21 | 淮安威灵电机制造有限公司 | Isolated asynchronous communication circuit and method of household appliance and household appliance |
| CN115037569A (en) * | 2022-06-06 | 2022-09-09 | 无锡市朗迪测控技术有限公司 | LIN bus interface circuit |
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