CN109450762A - A kind of monobus communication signal isolation circuit with monitoring function - Google Patents
A kind of monobus communication signal isolation circuit with monitoring function Download PDFInfo
- Publication number
- CN109450762A CN109450762A CN201811590816.9A CN201811590816A CN109450762A CN 109450762 A CN109450762 A CN 109450762A CN 201811590816 A CN201811590816 A CN 201811590816A CN 109450762 A CN109450762 A CN 109450762A
- Authority
- CN
- China
- Prior art keywords
- optocoupler
- connect
- monitoring
- collector
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 88
- 238000002955 isolation Methods 0.000 title claims abstract description 26
- 230000006854 communication Effects 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 title claims abstract description 21
- 230000005669 field effect Effects 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000008054 signal transmission Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 24
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The present invention discloses a kind of monobus communication signal isolation circuit with monitoring function, first optocoupler, its control terminal is connect with host interface port, and the collector of first optocoupler is connect with the slave interface end, and the emitter of first optocoupler is connect with the ground wire at the slave interface end；Second optocoupler, control terminal are connect with the slave interface end, and the collector of second optocoupler is connect with the host interface port, and the emitter of second optocoupler is connect with the ground wire at the host interface port；First monitoring unit is connected to the collector and emitter of first optocoupler, the electric signal on collector and emitter for monitoring first optocoupler；Second monitoring unit is connected to the collector and emitter of second optocoupler, the electric signal on collector and emitter for monitoring second optocoupler.The present invention solves the technical issues of signal transmission can not be monitored effectively in monobus communication process.
Description
Technical field
The present invention relates to communication technique fields, and in particular to a kind of monobus communication signal isolation electricity with monitoring function
Road.
Background technique
The universal serial bus carried out data transmission between currently used microcomputer and peripheral hardware mainly have I2C bus, spi bus and
SCI bus.Wherein I2C bus is communicated (clock lines, a data line) in a manner of 2 line of synchronous serial, and spi bus is then
It is communicated in a manner of 3 line of synchronous serial (clock lines, a data input line, a data output line), and SCI bus
It is to be communicated (a data input line, a data output line) in an asynchronous manner.These buses at least need two or
Two or more signal wires.In recent years, it is proposed distinctive monobus (1-Wire Bus) technology.The technology and above-mentioned total
Line is different, it uses single signal wire, can not only transmit clock, but also can transmit data, and data transmission is two-way, thus this
The advantages that kind Single Wire Bus Technology has route simple, and hardware spending is few, low in cost, convenient for bus extension and safeguards.
Monobus is suitable for single host system, can control one or more slave devices.Host can be microcontroller,
Slave can be single wire bus device, and the data exchange between them only passes through a signal line.When only one slave devices,
System can be operated by single node system；When there is a plurality of slave devices, system then presses multi-node system operation.
But there are host sides and slave end signal to interfere with each other for current this monobus communication modes, causes to monitoring signals
Also interference is generated, so that can not effectively monitor to signals transmission.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
The monobus communication signal isolation circuit with monitoring function that the object of the present invention is to provide a kind of, host and from
Be provided with the signal monitoring unit of Phototube Coupling on the communication line of machine, signals transmission be monitored, at the same by
Host side and isolated location is respectively set from generator terminal, is effectively isolated host side and from generator terminal and to form mutually independent power-supply system
And earthed system, it eliminates host side and from the interference extremely in information exchange, improves the accuracy of signal transmission, solve list
The technical issues of signal transmission can not be monitored effectively during bus communication.
In order to realize these purposes according to the present invention and other advantages, a kind of monobus with monitoring function is provided
Communication signal isolation circuit, comprising:
First optocoupler, control terminal are connect with host interface port, and the collector of first optocoupler and the slave interface end connect
It connects, the emitter of first optocoupler is connect with the ground wire at the slave interface end；
Second optocoupler, control terminal are connect with the slave interface end, the collector of second optocoupler and the host interface
End connection, the emitter of second optocoupler are connect with the ground wire at the host interface port；
First monitoring unit is connected to the collector and emitter of first optocoupler, for monitoring first optocoupler
Electric signal on collector and emitter；
Second monitoring unit is connected to the collector and emitter of second optocoupler, for monitoring second optocoupler
Electric signal on collector and emitter.
Preferably, the host interface port is provided with the first comparing unit, and first comparing unit includes:
First diode, cathode are connect with the host interface port, and the host interface port is also connected with one first pull-up resistor；
First comparator, non-inverting input terminal are connect with the first diode anode；
First resistor, first end are connect with power end, the same phase of the second end of the first resistor and the first comparator
Input terminal connection.
Preferably, the light-emitting diodes tube cathode of first optocoupler is connect with the output end of the first comparator, described
The light-emitting diodes tube cathode of first optocoupler is connected to power end, the light emitting diode sun of first optocoupler by a second resistance
Pole is connected to power end by a 3rd resistor.
It preferably, further include that the first reference signal generates unit, first reference signal generates unit and includes:
First buffer, input terminal are connect with the collector of second optocoupler；
4th resistance, first end are connect with power end, and the second end of the 4th resistance is connected to first buffer
Input terminal；
First bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, the input terminal of first bleeder circuit
It is connect with the output end of first buffer, the output end of first bleeder circuit and the reverse phase of the first comparator are defeated
Enter end connection.
Preferably, the slave interface end is provided with the second comparing unit, and second comparing unit includes:
Second diode, cathode are connect with the slave interface end, and the slave interface end is also connected with one second pull-up resistor；
Second comparator, non-inverting input terminal are connect with second diode anode；
7th resistance, first end are connect with power end, the second end and the same phase of second comparator of the 7th resistance
Input terminal connection.
Preferably, the light-emitting diodes tube cathode of second optocoupler is connect with the output end of second comparator, described
The light-emitting diodes tube cathode of second optocoupler is connected to power end, the light emitting diode sun of second optocoupler by one the 8th resistance
Pole is connected to power end by one the 9th resistance.
It preferably, further include that the second reference signal generates unit, second reference signal generates unit and includes:
Second buffer, input terminal are connect with the collector of first optocoupler；
Tenth resistance, first end are connect with power end, and the second end of the tenth resistance is connected to second buffer
Input terminal；
Second bleeder circuit comprising the eleventh resistor and twelfth resistor being arranged in series, second bleeder circuit it is defeated
Enter end to connect with the output end of second buffer, the output end of second bleeder circuit is anti-with second comparator
The connection of phase input terminal.
It preferably, further include one first driving unit, first driving unit includes that the first field-effect tube and first are non-
Door, first field-effect tube are N-type field-effect tube, the source electrode of first field-effect tube connect with the host interface port,
Grounded drain, the grid of first field-effect tube connect the output end of first NOT gate, the input termination of first NOT gate
The collector of second optocoupler；
It further include one second driving unit, second driving unit includes the second field-effect tube and the second NOT gate, and described second
Field-effect tube is N-type field-effect tube, and the source electrode of second field-effect tube connect with the slave interface end, grounded drain, institute
The grid for stating the second field-effect tube connects the output end of second NOT gate, and the input of second NOT gate terminates first optocoupler
Collector.
Preferably, first monitoring unit includes:
Third diode, cathode connect the collector of first optocoupler；
First controllable triode, base stage connect the anode of the third diode by a thirteenth resistor, and described first can
Emitter connection the first monitoring power end of triode is controlled, the collector of the first controllable triode is connected by the 14th resistance
It is connected to the emitter of first optocoupler, the collector of the first controllable triode is connected to the first monitoring side.
Preferably, second monitoring unit includes:
4th diode, cathode connect the collector of second optocoupler；
Second controllable triode, base stage connect the anode of the 4th diode by 1 the 15th resistance, and described second can
Control emitter connection the second monitoring power end of triode, the hair of the collector connection third optocoupler of the second controllable triode
The light-emitting diodes tube cathode of optical diode anode, the third optocoupler is connected to the hair of second optocoupler by the 16th resistance
Emitter-base bandgap grading；
Wherein, the collector of the third optocoupler is connected to the second monitoring side, and second monitoring side passes through the 17th resistance
It is connected to the first monitoring power end, the emitter of the third optocoupler connects the first monitoring ground wire, the 14th resistance second end
Connect the first monitoring ground wire, the second monitoring of the 16th resistance second termination ground wire.
Compared with prior art, the beneficial effect that the present invention includes is:
1, the present invention is provided with monitoring unit in host side and signal transmssion line from generator terminal, is monitored to data transmission,
And signal transmitting and receiving end is fed back to, preferably to carry out feedback control；
2, two signal monitoring units carry out signal isolation, eliminate interfering with each other on signal monitoring end, improve to signal monitoring
Accuracy and reliability；
3, by the way that light-coupled isolation is respectively set in host side and from generator terminal, by host and slave processors be isolated into mutually indepedent power-supply system and
Earthed system is eliminated the signal interference between host and slave processors；
4, signal transmission error rates are reduced, the reliability of monobus signal transmission is improved；
5, the variation benchmark that unit is generated by reference signal, improves signal in the stability of transmission process.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to comment
It can implement accordingly.
As shown in Figure 1, the present invention provides a kind of monobus communication signal isolation circuit with monitoring function, including master
Machine transmission circuit and slave transmission circuit, host transmission circuit include the first pull-up resistor Rup1, the first comparing unit, the first light
Coupling U3 and the first reference signal generate unit.Slave transmission circuit includes the second pull-up resistor Rup2, the second comparing unit, second
Optocoupler U6 and the second reference signal generate unit.
In order to which host transmission circuit and slave transmission circuit realize electrical isolation, eliminates host transmission circuit and slave is received and dispatched
Signal interference between circuit improves the accuracy and reliability communicated between host transmission circuit and slave transmission circuit, and
Propose technical solution of the present invention.
First pull-up resistor Rup1 is connect with host interface port SBUS1, under normal condition, passes through the first pull-up resistor Rup1
The voltage of host interface port SBUS1 is maintained at high level.
First comparing unit is connected between host interface port SBUS1 and the first optocoupler U3, specifically, described first compares
Unit includes: first diode D1, first comparator OP1 and first resistor R1, the cathode of first diode D1 and the host
Interface end SBUS1 connection, the non-inverting input terminal of first comparator OP1 are connect with the first diode D1 anode, pass through first
Diode D1 avoids the reception signal of host from generating interference to the first comparing unit.The anti-phase input of the first comparator OP1
The output end for generating unit with first reference signal is held to connect.The first end of first resistor R1 is connect with power end Vcc, institute
The second end for stating first resistor R1 is connect with the non-inverting input terminal of the first comparator OP1, under normal condition, is compared for first
The non-inverting input terminal of device OP1 provides high level signal.
Wherein, the power end Vdd of the power end Vcc of the host interface port SBUS1 and slave interface end SBUS2 is protected
Isolation is held, and each power end Vcc voltage of the host interface port SBUS1 is consistent, the slave interface end SBUS2's
Each power end Vdd voltage is consistent.
Specifically, in the present embodiment, each power end Vcc of host side and each power end Vdd from generator terminal mutually every
From setting, the voltage of Vcc and Vdd can be set to 5V, and the resistance value of each resistance can be equal.
The control terminal of first optocoupler U3 is connect with the first comparing unit output end, specifically, the first optocoupler U3
Light-emitting diodes tube cathode connect with the output end of the first comparator OP1, the light emitting diode of the first optocoupler U3 yin
Pole is connected to power end Vcc by a second resistance R2, and the light-emitting diodes tube anode of the first optocoupler U3 passes through third electricity
Resistance R3 is connected to power end Vcc, and first comparator OP1 exports low level, then the lumination of light emitting diode of the first optocoupler U3.
The input terminal that first reference signal generates unit is connect with the collector of the second optocoupler U6, and described first
The inverting input terminal of comparator OP1 is connect with the output end that first reference signal generates unit.Specifically, first base
It includes: the first buffer U1, the 4th resistance R4 and the first bleeder circuit, the input terminal of the first buffer U1 that calibration signal, which generates unit,
It is connect with the collector of the second optocoupler U6；4th resistance R4 first end is connect with power end Vcc, the 4th resistance R4's
Second end is connected to the input terminal of the first buffer U1；First bleeder circuit includes the 5th resistance R5 being arranged in series and
Six resistance R6, the first end of the 5th resistance R5 are connect with the output end of the first buffer U1, the second end of the 6th resistance R6
Ground connection.The connects end altogether of 5th resistance R5 and the 6th resistance R6 is connect with the inverting input terminal of first comparator OP1.
First driving unit includes the first field-effect tube Q1 and the first NOT gate U2, the first field-effect tube Q1 is N
The driving capability of type field-effect tube, N-type field-effect tube is stronger, improves signal transmission distance and accuracy.First field-effect
The source electrode of pipe Q1 connect with the host interface port SBUS1, grounded drain, and the grid of the first field-effect tube Q1 connects described
The output end of one NOT gate U2, the input of the first NOT gate U2 terminate the collector of the second optocoupler U6.
Slave transmission circuit is consistent with host transmission circuit structure, and slave transmission circuit and host transmission circuit are staggeredly pair
Claim setting.Specifically, the second pull-up resistor Rup2 is connect with slave interface end SBUS2, the output end of the first optocoupler U3 with
The slave interface end SBUS2 connection, the signal that host is sent is successively by comparing and being sent to slave interface end after shaping
SBUS2。
The non-inverting input terminal of second comparing unit is connect with the slave interface end SBUS2, second comparing unit
Inverting input terminal is connect with the output end that first reference signal generates unit.Specifically, second comparing unit includes:
Second diode D2, the second comparator OP2 and the 7th resistance R7, the cathode of the second diode D2 and the slave interface end
SBUS2 connection；The non-inverting input terminal of second comparator OP2 is connect with the second diode D2 anode, second comparator
The inverting input terminal of OP2 is connect with the output end that second reference signal generates unit.
The first end of 7th resistance R7 is connect with power end Vdd, and the second end of the 7th resistance R7 and described second compares
Non-inverting input terminal connection compared with device OP2.
Second optocoupler U6 control terminal is connect with the second comparing unit output end, specifically, the second optocoupler U6
Light-emitting diodes tube cathode is connect with the output end of the second comparator OP2, the light-emitting diodes tube cathode of the second optocoupler U6
It is connected to power end Vdd by one the 8th resistance R8, the light-emitting diodes tube anode of the second optocoupler U6 passes through one the 9th resistance
R9 is connected to power end Vdd.Second comparator OP2 exports low level, then the lumination of light emitting diode of the second optocoupler U6.
Wherein, the emitter of the first optocoupler U3 is connect with the ground wire at the slave interface end SBUS2, and described second
The emitter of optocoupler U6 is connect with the ground wire at the host interface port SBUS1, so that the emitter and current collection of the first optocoupler U3
Using the system voltage of slave interface end SBUS2, the emitter and collector of the second optocoupler U6 connects using host for pole
The system voltage of mouth end SBUS1.To which the system of the system voltage of host interface port SBUS1 and slave interface end SBUS2 is electric
Pressure realizes isolation by the first optocoupler U3 and the second optocoupler U6.
The input terminal that second reference signal generates unit is connect with the collector of the first optocoupler U3, and described second
The output end that reference signal generates unit is connect with the inverting input terminal of the second comparator OP2.Specifically, second base
It includes: the second buffer U4, the tenth resistance R10 and the second bleeder circuit, the input of the second buffer U4 that calibration signal, which generates unit,
End is connect with the collector of the first optocoupler U3；The first end of tenth resistance R10 is connect with power end Vdd, the tenth electricity
The second end of resistance R10 is connected to the input terminal of the second buffer U4；Second bleeder circuit includes the 11 be arranged in series
Resistance R11 and twelfth resistor R12, the first end of eleventh resistor R11 are connect with the output end of the second buffer U4, the
The second end of 12 resistance R12 is grounded.The connects end altogether of eleventh resistor R11 and twelfth resistor R12 are with the second comparator OP2's
Inverting input terminal connection.
Second driving unit includes the second field-effect tube Q2 and the second NOT gate U5, the second field-effect tube Q2 is N
Type field-effect tube, the source electrode of the second field-effect tube Q2 connect with the slave interface end SBUS2, grounded drain, and described
The grid of two field-effect tube Q2 connects the output end of the second NOT gate U5, and the input of the second NOT gate U5 terminates first light
The collector of coupling U3.
The course of work is as follows:
When host interface port SBUS1 issues high level signal, i.e., voltage is pulled to high level by the first pull-up resistor Rup1, defeated
Enter to the non-inverting input terminal of first comparator OP1, first comparator OP1 exports high level, and the first optocoupler U3 is not triggered, the first light
Coupling U3 is remained off, by the effect of the tenth resistance R10, the input terminal input high level of the second NOT gate U5, second effect
Should pipe Q2 control terminal input low level, remain off, since the voltage pull-up of the second pull-up resistor Rup2 acts on, slave connect
Mouth end SBUS2 keeps high level, is equivalent to and receives high level signal.
Meanwhile the effect by the tenth resistance R10, the second buffer U4 input terminal keep high level, the second comparator OP2
Inverting input terminal keeps high level, and the second comparator OP2 exports low level, triggers the second optocoupler U6, the second optocoupler U6 conducting, the
The input terminal input low level of one buffer U1, that is, the input terminal input low level of the first bleeder circuit, first comparator
The inverting input terminal input low level of OP1, so that first comparator OP1 stablizes output high level signal, final slave interface end
SBUS2 keeps high level.
In above-mentioned signals transmission, Phototube Couplings are carried out by two optocouplers, eliminate host end system and from generator terminal system
Signal interference between system improves signal and transmits accuracy.Meanwhile the first light emitting diode and host end system on optocoupler U3
It connects, the triode on the first optocoupler U3 is connect with slave end system；It is corresponding, light emitting diode on the second optocoupler U6 with from
Generator terminal system connects, and the triode on the second optocoupler U6 is connect with host end system；To by host end system and from generator terminal system
The ground wire of system is isolated.
When host interface port SBUS1 issues low level signal, it is input to the non-inverting input terminal of first comparator OP1, the
One comparator OP1 exports low level, the first optocoupler U3 triggering, the first optocoupler U3 conducting, the input end grounding of the second NOT gate U5, phase
When in input low level, the second field-effect tube Q2 control terminal input high level, triggering and conducting, slave interface end SBUS2 ground connection, from
Machine interface end SBUS2 becomes low level, is equivalent to and receives low level signal.
Meanwhile the second buffer U4 input end grounding, the second buffer U4 input terminal receive low level, the second comparator
OP2 inverting input terminal receives low level, and the second comparator OP2 exports high level, and the second optocoupler U6 is disconnected, the first buffer U1's
Input terminal input high level, that is, the input terminal input high level of the first bleeder circuit, the anti-phase input of first comparator OP1
Input high level is held, so that first comparator OP1 stablizes output low level signal, final slave interface end SBUS2 keeps low electricity
It is flat.
From the above mentioned, two systems are subjected to photosignal isolation by two optocouplers, while by by two optocouplers
Ground wire isolation connection, it is finally that host and slave processors system is mutually isolated, two independent receive-transmit systems are formed, elimination is interfered with each other, mentioned
The reliability and accuracy of high RST transmission.
In above process, the benchmark that reference signal generates unit output end changes, steady to keep signal to transmit
It is qualitative.
When slave interface end SBUS2 sends signal, and host interface port SBUS1 receives signal, the course of work and above-mentioned master
The process that machine interface end SBUS1 sends a signal to slave interface end SBUS2 is consistent.
First monitoring unit is connected to the collector and emitter of the first optocoupler U3, for monitoring first optocoupler
Electric signal on the collector and emitter of U3, that is, transmission signal of the host interface port to slave interface end is supervised
It surveys.
First monitoring unit includes: the controllable triode Q3 of third diode D3 and first, the yin of third diode D3
Pole connects the collector of the first optocoupler U3；The base stage of first controllable triode Q3 passes through a thirteenth resistor R13 connection institute
The anode of third diode D3 is stated,
Emitter connection the first monitoring power end Vp1 of the first controllable triode Q3, the first controllable triode Q3's
Collector is connected to the emitter of the first optocoupler U3, the collection of the first controllable triode Q3 by the 14th resistance R14
Electrode is connected to the first monitoring side Moni1.
Second monitoring unit is connected to the collector and emitter of the second optocoupler U6, for monitoring second optocoupler
Electric signal on the collector and emitter of U6, that is, transmission signal of the slave interface end to host interface port is supervised
It surveys.
Second monitoring unit includes: the controllable triode Q4 of the 4th diode D4 and second, the yin of the 4th diode D4
Pole connects the collector of the second optocoupler U6；The base stage of second controllable triode Q4 passes through 1 the 15th resistance R15 connection institute
State the anode of the 4th diode D4, the second monitoring of the emitter connection power end Vp2 of the second controllable triode Q4, described the
The light-emitting diodes tube anode of the collector connection third optocoupler U7 of two controllable triode Q4, the light-emitting diodes of the third optocoupler U7
Tube cathode is connected to the emitter of the second optocoupler U7 by the 16th resistance R16.
Wherein, the collector of the third optocoupler U7 is connected to the second monitoring side Moni2, and second monitoring side passes through
17th resistance R17 is connected to the first monitoring power end Vp1, and the emitter of the third optocoupler U7 meets the first monitoring ground wire Vp1_
The first monitoring of Gnd, the 14th resistance R14 second termination ground wire Vp1_Gnd, the 16th resistance R16 second termination the
Two monitoring ground wire Vp2_Gnd.
It follows that power end used by the first monitoring unit and the second monitoring unit is mutually indepedent, the ground wire of use
Independently of each other, interfering with each other between two monitoring unit, while the first monitoring side Moni1 and the second monitoring side Moni2 are eliminated
It is all built up in side, is convenient for monitoring observation.
Monitoring process is as follows:
The first controllable controllable triode Q2 of triode Q3 and second is p-type triode, when high level on the first optocoupler U3 collector
When, the first controllable triode Q3 is disconnected, and the first monitoring side Moni1 receives low level；When low electricity on the first optocoupler U3 collector
Usually, the first controllable triode Q3 is opened, and the first monitoring side Moni1 receives high level.
When high level on the second optocoupler U6 collector, the second controllable triode Q4 is disconnected, and third optocoupler U7 is not triggered, the
Two monitoring side Moni2 receive high level.When low level on the second optocoupler U6 collector, the second controllable triode Q4 is opened,
Third optocoupler U7 is triggered, and the second monitoring side Moni2 receives low level.
The level signal on slave connection can be monitored by two monitoring unit.
From the above mentioned, the present invention is provided with monitoring unit in host side and signal transmssion line from generator terminal, passes to data
It is defeated to be monitored, and signal transmitting and receiving end is fed back to, preferably to carry out feedback control；Meanwhile two signal monitoring units carry out
Signal isolation eliminates interfering with each other on signal monitoring end, improves the accuracy and reliability to signal monitoring；On the other hand,
The present invention by the way that light-coupled isolation is respectively set in host side and from generator terminal, by host and slave processors be isolated into mutually indepedent power-supply system and
Earthed system is eliminated the signal interference between host and slave processors；Meanwhile signal transmission error rates are reduced, it improves single total
The reliability of line signal transmission.Also, the variation benchmark that unit is generated by reference signal, improves signal in transmission process
Stability.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easy
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of monobus communication signal isolation circuit with monitoring function characterized by comprising
First optocoupler, control terminal are connect with host interface port, and the collector of first optocoupler is connect with slave interface end, institute
The emitter for stating the first optocoupler is connect with the ground wire at the slave interface end；
Second optocoupler, control terminal are connect with the slave interface end, the collector of second optocoupler and the host interface
End connection, the emitter of second optocoupler are connect with the ground wire at the host interface port；
First monitoring unit is connected to the collector and emitter of first optocoupler, for monitoring first optocoupler
Electric signal on collector and emitter；
Second monitoring unit is connected to the collector and emitter of second optocoupler, for monitoring second optocoupler
Electric signal on collector and emitter.
2. as described in claim 1 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that the master
Machine interface end is provided with the first comparing unit, and first comparing unit includes:
First diode, cathode are connect with the host interface port, and the host interface port is also connected with one first pull-up resistor；
First comparator, non-inverting input terminal are connect with the first diode anode；
First resistor, first end are connect with power end, the same phase of the second end of the first resistor and the first comparator
Input terminal connection.
3. as claimed in claim 2 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that described the
The light-emitting diodes tube cathode of one optocoupler is connect with the output end of the first comparator, the light emitting diode yin of first optocoupler
Pole is connected to power end by a second resistance, and the light-emitting diodes tube anode of first optocoupler is connected to by a 3rd resistor
Power end.
4. as claimed in claim 3 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that further include
First reference signal generates unit, and first reference signal generates unit and includes:
First buffer, input terminal are connect with the collector of second optocoupler；
4th resistance, first end are connect with power end, and the second end of the 4th resistance is connected to first buffer
Input terminal；
First bleeder circuit comprising the 5th resistance being arranged in series and the 6th resistance, the input terminal of first bleeder circuit
It is connect with the output end of first buffer, the output end of first bleeder circuit and the reverse phase of the first comparator are defeated
Enter end connection.
5. as claimed in claim 4 with monitoring function monobus communication signal isolation circuit, which is characterized in that it is described from
Machine interface end is provided with the second comparing unit, and second comparing unit includes:
Second diode, cathode are connect with the slave interface end, and the slave interface end is also connected with one second pull-up resistor；
Second comparator, non-inverting input terminal are connect with second diode anode；
7th resistance, first end are connect with power end, the second end and the same phase of second comparator of the 7th resistance
Input terminal connection.
6. as claimed in claim 5 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that described the
The light-emitting diodes tube cathode of two optocouplers is connect with the output end of second comparator, the light emitting diode yin of second optocoupler
Pole is connected to power end by one the 8th resistance, and the light-emitting diodes tube anode of second optocoupler is connected to by one the 9th resistance
Power end.
7. as claimed in claim 6 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that further include
Second reference signal generates unit, and second reference signal generates unit and includes:
Second buffer, input terminal are connect with the collector of first optocoupler；
Tenth resistance, first end are connect with power end, and the second end of the tenth resistance is connected to second buffer
Input terminal；
Second bleeder circuit comprising the eleventh resistor and twelfth resistor being arranged in series, second bleeder circuit it is defeated
Enter end to connect with the output end of second buffer, the output end of second bleeder circuit is anti-with second comparator
The connection of phase input terminal.
8. as claimed in claim 7 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that further include
One first driving unit, first driving unit include the first field-effect tube and the first NOT gate, and first field-effect tube is N
Type field-effect tube, the source electrode of first field-effect tube connect with the host interface port, grounded drain, first field-effect
The grid of pipe connects the output end of first NOT gate, and the input of first NOT gate terminates the collector of second optocoupler；
It further include one second driving unit, second driving unit includes the second field-effect tube and the second NOT gate, and described second
Field-effect tube is N-type field-effect tube, and the source electrode of second field-effect tube connect with the slave interface end, grounded drain, institute
The grid for stating the second field-effect tube connects the output end of second NOT gate, and the input of second NOT gate terminates first optocoupler
Collector.
9. as claimed in claim 8 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that described the
One monitoring unit includes:
Third diode, cathode connect the collector of first optocoupler；
First controllable triode, base stage connect the anode of the third diode by a thirteenth resistor, and described first can
Emitter connection the first monitoring power end of triode is controlled, the collector of the first controllable triode is connected by the 14th resistance
It is connected to the emitter of first optocoupler, the collector of the first controllable triode is connected to the first monitoring side.
10. as claimed in claim 9 with the monobus communication signal isolation circuit of monitoring function, which is characterized in that described
Second monitoring unit includes:
4th diode, cathode connect the collector of second optocoupler；
Second controllable triode, base stage connect the anode of the 4th diode by 1 the 15th resistance, and described second can
Control emitter connection the second monitoring power end of triode, the hair of the collector connection third optocoupler of the second controllable triode
The light-emitting diodes tube cathode of optical diode anode, the third optocoupler is connected to the hair of second optocoupler by the 16th resistance
Emitter-base bandgap grading；
Wherein, the collector of the third optocoupler is connected to the second monitoring side, and second monitoring side passes through the 17th resistance
It is connected to the first monitoring power end, the emitter of the third optocoupler connects the first monitoring ground wire, the 14th resistance second end
Connect the first monitoring ground wire, the second monitoring of the 16th resistance second termination ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590816.9A CN109450762B (en) | 2018-12-20 | 2018-12-20 | Single-bus communication signal isolation circuit with monitoring function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590816.9A CN109450762B (en) | 2018-12-20 | 2018-12-20 | Single-bus communication signal isolation circuit with monitoring function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109450762A true CN109450762A (en) | 2019-03-08 |
| CN109450762B CN109450762B (en) | 2024-05-10 |
Family
ID=65535447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811590816.9A Active CN109450762B (en) | 2018-12-20 | 2018-12-20 | Single-bus communication signal isolation circuit with monitoring function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109450762B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674381A (en) * | 2005-03-10 | 2005-09-28 | 上海交通大学 | Under-voltage isolating monitoring circuit |
| US20080152063A1 (en) * | 2006-12-26 | 2008-06-26 | Hon Hai Precision Industry Co., Ltd. | Serial interface connecting circuit |
| CN101216506A (en) * | 2008-01-02 | 2008-07-09 | 江苏省电力公司无锡供电公司 | Optical coupling isolation control interface circuit structure |
| CN201118630Y (en) * | 2007-11-09 | 2008-09-17 | 深圳天行健电子有限公司 | A non-polarity two-core communication bus receiver/transmitter for photoelectrical separation |
| CN205679749U (en) * | 2016-06-06 | 2016-11-09 | 武汉奇星电子有限公司 | Power on/off observation circuit |
| CN206835082U (en) * | 2017-06-08 | 2018-01-02 | 深圳市拓普泰克电子有限公司 | Serial ports isolates communication interface circuit and electronic equipment |
| CN209250666U (en) * | 2018-12-20 | 2019-08-13 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal isolation circuit with monitoring function |
-
2018
- 2018-12-20 CN CN201811590816.9A patent/CN109450762B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674381A (en) * | 2005-03-10 | 2005-09-28 | 上海交通大学 | Under-voltage isolating monitoring circuit |
| US20080152063A1 (en) * | 2006-12-26 | 2008-06-26 | Hon Hai Precision Industry Co., Ltd. | Serial interface connecting circuit |
| CN201118630Y (en) * | 2007-11-09 | 2008-09-17 | 深圳天行健电子有限公司 | A non-polarity two-core communication bus receiver/transmitter for photoelectrical separation |
| CN101216506A (en) * | 2008-01-02 | 2008-07-09 | 江苏省电力公司无锡供电公司 | Optical coupling isolation control interface circuit structure |
| CN205679749U (en) * | 2016-06-06 | 2016-11-09 | 武汉奇星电子有限公司 | Power on/off observation circuit |
| CN206835082U (en) * | 2017-06-08 | 2018-01-02 | 深圳市拓普泰克电子有限公司 | Serial ports isolates communication interface circuit and electronic equipment |
| CN209250666U (en) * | 2018-12-20 | 2019-08-13 | 苏州路之遥科技股份有限公司 | A kind of monobus communication signal isolation circuit with monitoring function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109450762B (en) | 2024-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109525475A (en) | A kind of monobus communication signal isolation circuit | |
| CN104776559B (en) | A kind of convertible frequency air-conditioner and its bus-type electric current loop communication system | |
| CN106209543B (en) | A kind of bidirectional bus telecommunication circuit and communication means | |
| CN207926616U (en) | A kind of meter bus communication circuit device | |
| CN203982576U (en) | M-BUS slave telecommunication circuit | |
| CN206313786U (en) | MBUS principal and subordinate's monitoring devices | |
| CN101826243A (en) | Two-wire active infrared detection alarm system | |
| CN201118630Y (en) | A non-polarity two-core communication bus receiver/transmitter for photoelectrical separation | |
| CN1819522A (en) | M-Bus host interface device | |
| CN209250666U (en) | A kind of monobus communication signal isolation circuit with monitoring function | |
| CN209250665U (en) | A kind of monobus communication signal isolation circuit | |
| CN209250667U (en) | A kind of monobus communication signal enhancing circuit with monitoring function | |
| CN109474505B (en) | Single-bus communication signal enhancement circuit with monitoring function | |
| CN109450762A (en) | A kind of monobus communication signal isolation circuit with monitoring function | |
| CN203520392U (en) | Communication circuit for electronic exploration detonator | |
| CN208154732U (en) | Slave telecommunication circuit, slave, electrical equipment and slave telecommunication circuit | |
| CN108108318B (en) | TTL changes MBUS communication terminal | |
| CN209248523U (en) | A kind of monobus communication signal repeat circuit | |
| CN109726160B (en) | Single-bus communication signal relay circuit with monitoring function | |
| CN202025203U (en) | Feeding type communication circuit | |
| CN109522260A (en) | A kind of monobus communication signal repeat circuit | |
| AU2008200997A1 (en) | A conversion circuit | |
| CN201869212U (en) | Two-wire-system host computer circuit | |
| CN109586750A (en) | A kind of monobus communication signal enhancing circuit | |
| CN209149104U (en) | A kind of activation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |