CN207518568U - A kind of high-speed bidirectional communication isolation circuit based on double optocouplers - Google Patents
A kind of high-speed bidirectional communication isolation circuit based on double optocouplers Download PDFInfo
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Abstract
The utility model discloses a kind of high-speed bidirectional communication isolation circuits based on double optocouplers, including the first input-output unit, double optical couplers and the second input-output unit, first input-output unit is connect with double optical coupler one end, the other end of double optical couplers is connect with the second input-output unit, the symmetrical configuration of first input-output unit and the second input-output unit, the circuit is only by 6 transistors, two optocouplers and 12 resistance compositions.The utility model is simple in structure, low in energy consumption, and communication can be realized without additional control port, and interlocking situation is avoided to occur.
Description
Technical field
The utility model is related to photoelectric coupler isolated communication circuits, double more specifically to a kind of high speed based on double optocouplers
To communication isolation circuit.
Background technology
With the fast development of Internet of Things, using more and more extensive, deep；The front-end information collecting device needed is also got over
Come more, function also becomes more complicated, and these equipment all need access intelligent control device, realize according to rendezvous protocol
Information sharing and intelligentized collection are transmitted, processing, are performed, and the seamless access of equipment needs a large amount of controller.Substation
Multi-dimensional intelligent monitoring system contains numerous front-end collection units, such as humiture collection, SF6 information collections, light, air-conditioning control
System, track camera control etc., the connection communication stability of each monitoring unit are the important guarantees that system is stablized.In order to grasp user
Make maximization that is simplified, realizing controller benefit, controlled as possible with the I/O mouths of a controller, receive one or more equipment；
In a communications system in order to enhance system stability, communication isolating need to be carried out between main control module and external module, with
The development of electronic technology, it is desirable that the isolation between circuit system and circuit is higher and higher；Because between reception and transmitting signal every
From will not enough influence receiving sensitivity, cause channel interference or influence the bit error rate；Being isolated between circuit bad signal matter will occurs
Amount is poor, spuious to increase, and mutually makes an uproar and degenerates or even phenomena such as circuit self-excitation, therefore the isolation in modern system between circuit becomes
It is particularly important.
Common isolation method has electromagnetic isolation, modulation isolation, Phototube Coupling etc. in communication system at present, wherein using light
The photoelectric isolating circuit of coupler composition is most widely used, and the major advantage of photo-coupler is one-way transmission signal, input terminal
Electrical isolation is fully achieved with output terminal, strong antijamming capability, service life is long, and efficiency of transmission is high.It is widely used in level
Isolation, switching circuit, distant signal transmission, pulse amplifying, solid-state relay (SSR), instrument between conversion, signal isolation, grade
In instrument, communication equipment and microcomputer interface.In single-chip switching power supply, opto-coupled feedback electricity is may make up using linear optocoupler
Road changes duty ratio by adjusting control end electric current, reaches accurate voltage stabilizing purpose.
In existing bi-directional digital isolation circuit, much using Magnetic isolation, still, Magnetic isolation is difficult to static level
It is identified, it usually needs additional control circuit, which results in additional control overhead, while increasing circuit complexity,
Also increase the power consumption of circuit.In the practical application of circuit, part bi-directional digital isolation circuit employs the design of double optocouplers,
Isolation is achieved the purpose that, but many designs increase the power consumption of equipment or bus physical layer communication rule have been violated in part
Model, the equipment damage be easy to causeing in bus, it is difficult to promote and apply.
Application No. is 201210273608.2, utility model is entitled, and " the high-speed bidirectional communication isolating based on double optocouplers is electric
The Chinese patent application on road " discloses a kind of two-way communication optical coupling isolation circuit based on triode.In the circuit, can
Above-mentioned technical problem is solved, while reduces requirement of the isolation circuit to the optocoupler parameter that communicates, has reached high two-way communication speed
Rate.Per side input-output unit respectively comprising an optocoupler, four triodes or metal-oxide-semiconductor, multiple resistance in isolation circuit
With a speed-up capacitor, the stability and communication efficiency of circuit operation are significantly improved.But required electronics is first in the circuit
Device is still more, and structure is more complicated, and requirement of the circuit to power supply precision is harsher, and antijamming capability is weaker, operation
Power consumption also has the space further promoted.
Therefore, it is necessary to a kind of simple and efficient, reducing to the parameter request of component and operation power consumption, communication efficiency is high,
Serial bus communication specification is complied with standard, is suitable for the isolation circuit of serial bus structure.
Utility model content
To solve the above-mentioned problems, the purpose of the utility model is to provide a kind of circuit structure is simple, operation is low in energy consumption,
The high high-speed bidirectional communication isolation circuit based on double optocouplers of communication efficiency.
The utility model adopts the following technical solution to achieve these goals：A kind of high-speed bidirectional based on double optocouplers leads to
Believe isolation circuit, including the first input-output unit, double optical couplers and the second input-output unit, the first input-output unit with
The connection of double optical coupler one end, the other end of double optical couplers are connect with the second input-output unit, the first input-output unit and the
The symmetrical configuration of two input-output units；First input-output unit include triode Q4, Q5 and Q6, resistance R7, R8,
R9, R10, R11 and R12, the emitter of triode Q5 and the emitter of triode Q6 are connect respectively with power supply VCC, the first input
Output terminal IN1 is connect by collectors of the resistance R8 respectively with the base stage of triode Q5 and triode Q6, the transmitting of triode Q4
Pole is connect by pull-up resistor R7 with power supply VCC, and the first input/output terminal IN1 is connect with the collector of triode Q4, triode
The emitter ground connection of Q4, the collector of triode Q5 are connect with the anode of optocoupler U1, and the cathode of optocoupler U1 is connect by resistance R12
Ground, the base stage of triode Q6 are connect by pull-up resistor R9 with power supply VCC, and the base stage of triode Q6 passes through resistance R10 and optocoupler
The collector connection of U2, the emitter of optocoupler U2 are connect with the base stage of triode Q4, and the base stage of triode Q4 is connect by resistance R11
Ground；Second input-output unit include triode Q1, Q2 and Q3, resistance R1, R2, R3, R4, R5 and R6, thus form with
First input-output unit symmetrical structure.
In said program, the resistance value of the resistance R3 is more than the resistance value of resistance R5, and the resistance value of resistance R9 is more than resistance R11
Resistance value.
More specifically, described triode Q2, Q3, Q5 and Q6 select PNP transistor, triode Q1 and Q4 select NPN type
Transistor.
The utility model have the advantage that including：
1, the isolation circuit of the utility model, device is few, and the operation is stable, overall structure is simple and efficient, and two lateral circuits are complete
Full equity, can freely exchange, without additional communication control end.
2, the isolation circuit of the utility model is reduced to the requirement of the parameter designing of electronic component, required number of devices compared with
It is few, conducive to the integrated of circuit.
3, the isolation circuit of the utility model, communication is reliable, and stability is good, can reach higher two-way communication rate,
It after tested in the frequency of 5V power supplys, 100kHZ, loads as that can be worked normally under 400pF capacitances, in the course of work, optocoupler is without complete
Full on or off is equivalent to the rising for improving optocoupler or fall time, while circuit overall power is reduced, is promoted
Optocoupler performance.
4, the isolation circuit of the utility model, micro power consumption during normal operation, when being emulated with circuit shown in Fig. 2,
Circuit is operated under the frequency of 5V power supplys, 100kHZ, both sides total power consumption in 25mW (practical 22.4mW) below.
Description of the drawings
Fig. 1 is the two-way communication separation principle circuit of the utility model；
Fig. 2 is an application example of isolation circuit；
Fig. 3 is the signal relation schematic diagram of isolation circuit shown in Fig. 2.
Specific embodiment
Referring to Fig. 1, the utility model includes the first input-output unit, double optical couplers and the second input-output unit, the
One input-output unit is connect with double optical coupler one end, and the other end of double optical couplers is connect with the second input-output unit, and first
The symmetrical configuration of input-output unit and the second input-output unit.
First input-output unit includes triode Q4, Q5 and Q6, resistance R7, R8, R9, R10, R11 and R12, and three
The emitter of pole pipe Q5 and the emitter of triode Q6 are connect respectively with power supply VCC, and the first input/output terminal IN1 passes through resistance R8
The collector with the base stage of triode Q5 and triode Q6 is connect respectively, and the emitter of triode Q4 passes through pull-up resistor R7 and electricity
Source VCC connections, the first input/output terminal IN1 are connect with the collector of triode Q4, the emitter ground connection of triode Q4, triode
The collector of Q5 is connect with the anode of optocoupler U1, and the cathode of optocoupler U1 is grounded by resistance R12, and the base stage of triode Q6 passes through upper
Pull-up resistor R9 is connect with power supply VCC, and the base stage of triode Q6 is connect by resistance R10 with the collector of optocoupler U2, optocoupler U2's
Emitter is connect with the base stage of triode Q4, and the base stage of triode Q4 is grounded by resistance R11.Triode Q5 and Q6 select PNP
Transistor npn npn, triode Q4 select NPN transistor.
Second input-output unit includes triode Q1, Q2 and Q3, resistance R1, R2, R3, R4, R5 and R6, triode
The emitter of Q2 and the emitter of triode Q3 are connect respectively with power supply VCC, and the second input/output terminal IN2 is distinguished by resistance R2
It is connect with the base stage of triode Q2 and the collector of triode Q3, the emitter of triode Q1 passes through pull-up resistor R1 and power supply
VCC connections, the second input/output terminal IN2 are connect with the collector of triode Q1, the emitter ground connection of triode Q1, triode Q2
Collector connect with the anode of optocoupler U2, the cathode of optocoupler U2 is grounded by resistance R6, and the base stage of triode Q3 passes through pull-up
Resistance R3 is connect with power supply VCC, and the base stage of triode Q3 is connect by resistance R4 with the collector of optocoupler U1, the transmitting of optocoupler U1
Pole is connect with the base stage of triode Q1, and the base stage of triode Q1 is grounded by resistance R5.Triode Q2 and Q3 select positive-negative-positive crystal
Pipe, triode Q1 select NPN transistor.
Originally it is that the operation principle of utility model is as follows based on above scheme：
When IN1 becomes low level by high level, triode Q5 base stages are low levels, and triode Q5 is connected, and collector is defeated
Go out high level, at this time the photodiode conducting of optocoupler U1；After optocoupler conducting, it is both turned on right side circuit Q1, Q3.Q1 is connected
Afterwards, IN2 outputs low level on the right side of circuit, so as to which the low level in left side is smoothly sent to right side, completes signal transmission.
In addition, since Q3 is connected, Q2 transistor bases are in high level, and Q2 is locked.It is hindered by choosing R3 resistance values more than R5
Value can be such that triode Q3 is connected prior to Q1, and than ending after Q1, so that it is guaranteed that during Q1 is connected, Q2 triodes are locked high electricity
It is flat, make optocoupler U2 that can not take electricity, avoid the low level reverse transfers of Q1 that circuit both sides colleague is caused low level occur and lock.
When the first input/output terminal IN1 becomes high level by low level, the base stage of triode Q5 becomes high level, three poles
Pipe Q5 is in by state, at this time optocoupler U1 dead electricity cut-off, and the base stage of triode Q1, Q3 become high level, and triode Q1 ends,
Output terminal IN2 becomes high level, and since R3 resistance is more than R5, before Q1 cut-offs, Q3 will not end, and ensure that in low level
Q2 is in by state always when being converted to high level.
Q1 and Q3 is output transistor in foregoing circuit, there is enlarging function to optocoupler signal, and Q2 and Q5 are realized in optocoupler
The power supply control of photodiode, Q6 and Q3 realize the Self-unlocking during circuit communication.Above-mentioned all triodes work with
On off state, the amplification factor the big more is conducive to the steady operation of circuit.In circuit, R3, R5 and R9, this 4 resistance of R11
Value is the key that circuit design, and due to Q6 and Q4, Q3 is suitable with Q1 base-emitter conducting voltages, and therefore, when design only needs to ensure
R3 is bigger than the value of R5, and R9 is bigger than the value of R11, you can Q1 is not turned on before ensureing Q3 conductings, and Q3 is still connected when Q1 ends.For
Ensure the quick response of optocoupler in circuit, the two resistance values also should not be too large, and usually be led in 1k or so, R4, R10 for optocoupler
Current-limiting resistance when logical ensures the normal work of optocoupler, usually in hundreds of Europe or so, it is ensured that optocoupler output can quickly be rung
It should.R6, R12 are the current-limiting resistance of photodiode, and resistance value is generally near 1k, which should not be too large, it is necessary to ensure that photoelectricity
Diode being capable of fast conducting and shutdown；R2, R8 are the base stage current-limiting resistance of Q2 and Q5, usually in 10k or so.R1, R7 are total
Line pull-up resistor, it is ensured that when idle, circuit is in high level, the two values can adjust according to bus load situation, work as bus
When capacitive load is larger, it need to suitably reduce resistance value, when capacitive load is smaller, it is possible to increase or even cancel the pull-up electricity of R1 and R7
It hinders (can not cancel when selecting MOS device).
For foregoing circuit in static state, power consumption is extremely low, is close to 0, due to using open-drain output, can be directly realized by between circuit
Parallel connection, facilitate bus extension, when circuit use parameter as shown in Figure 2 when, work in the simulated conditions of 100kHz in circuit
Under, for the entire circuit power consumption in both sides less than 25mW, the power consumption of circuit is extremely low.Its input/output signal relationship is as shown in Figure 3.
Claims (4)
1. a kind of high-speed bidirectional communication isolation circuit based on double optocouplers, including the first input-output unit, double optical couplers and
Two input-output units, the first input-output unit are connect with double optical coupler one end, the other end of double optical couplers and the second input
Output unit connects, the symmetrical configuration of the first input-output unit and the second input-output unit, it is characterised in that：Described first
Input-output unit include triode Q4, Q5 and Q6, resistance R7, R8, R9, R10, R11 and R12, the emitter of triode Q5 and
The emitter of triode Q6 is connect respectively with power supply VCC, and the first input/output terminal IN1 is by resistance R8 respectively with triode Q5's
Base stage is connected with the collector of triode Q6, and the emitter of triode Q4 is connect by pull-up resistor R7 with power supply VCC, and first is defeated
The collector for entering output terminal IN1 with triode Q4 is connect, the emitter ground connection of triode Q4, the collector and optocoupler of triode Q5
The anode connection of U1, the cathode of optocoupler U1 are grounded by resistance R12, and the base stage of triode Q6 passes through pull-up resistor R9 and power supply
VCC connections, the base stage of triode Q6 are connect by resistance R10 with the collector of optocoupler U2, the emitter and triode of optocoupler U2
The base stage connection of Q4, the base stage of triode Q4 are grounded by resistance R11；Second input-output unit include triode Q1,
Thus Q2 and Q3, resistance R1, R2, R3, R4, R5 and R6 are formed and the first input-output unit symmetrical structure.
2. a kind of high-speed bidirectional communication isolation circuit based on double optocouplers according to claim 1, it is characterised in that：The electricity
The resistance value for hindering R3 is more than the resistance value of resistance R5, and the resistance value of resistance R9 is more than the resistance value of resistance R11.
3. a kind of high-speed bidirectional communication isolation circuit based on double optocouplers according to claim 2, it is characterised in that：The electricity
The resistance value that the resistance value of resistance R3 and resistance R9 is selected as 1k Ω, resistance R5 and resistance R11 is selected as 866 Ω.
4. according to a kind of any one of Claim 1-3 high-speed bidirectional communication isolation circuit based on double optocouplers, feature exists
In：Described triode Q2, Q3, Q5 and Q6 select PNP transistor, and triode Q1 and Q4 select NPN transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721470826.XU CN207518568U (en) | 2017-11-07 | 2017-11-07 | A kind of high-speed bidirectional communication isolation circuit based on double optocouplers |
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| CN201721470826.XU CN207518568U (en) | 2017-11-07 | 2017-11-07 | A kind of high-speed bidirectional communication isolation circuit based on double optocouplers |
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| CN207518568U true CN207518568U (en) | 2018-06-19 |
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