CN206389387U - CAN signal transmitting device for intrinsic safe explosion-proof field - Google Patents
CAN signal transmitting device for intrinsic safe explosion-proof field Download PDFInfo
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- CN206389387U CN206389387U CN201720054433.4U CN201720054433U CN206389387U CN 206389387 U CN206389387 U CN 206389387U CN 201720054433 U CN201720054433 U CN 201720054433U CN 206389387 U CN206389387 U CN 206389387U
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Abstract
The CAN signal transmitting device for intrinsic safe explosion-proof field of present patent application, including：At least one first CAN signal transmission line part, including：For the limit energy protection module for connecting the first CAN signal transceiver of hazardous area external equipment and being connected between the first CAN signal transceiver and hazardous area external equipment；At least one second CAN signal transmission line part, including for connecting the second CAN signal transceiver of place of safety external equipment；Second CAN signal transmission line part includes the limit energy protection module between the second CAN signal transceiver and the second CAN signal transceiver of connection and place of safety external equipment；First isolation transmitter part communicates to connect the first RXD ends and the 2nd TXD ends respectively；Second isolation transmitter part communicates to connect the 2nd RXD ends and the first TXD ends respectively, realizes that CAN signal is transmitted in the two-way isolation of physical layer, meets intrinsic safe explosion-proof requirement.
Description
Technical field
Present patent application is related to CAN communication technical field, and the more particularly to CAN signal for intrinsic safe explosion-proof field is transmitted
Device.
Background technology
The terminal of the first CAN signal transceiver is connected by CAN, is that a kind of serial communication of multiple host pattern is total
Line, Basic Design code requirement has higher bit rate, high anti-interference type, and is capable of detecting when any mistake of generation.Letter
When number transmission range reaches 10Km, up to 5Kbps message transmission rate still can be provided.Due to CAN serial communication bus tool
Have these characteristics, it is natural in automobile, manufacturing industry and aircraft industry by extensive use.
CAN points are data link layer and physical layer, and wherein data link layer is divided into media access control sublayer and LLC sublayers, link layer
Function is that the signal for receiving physical layer is organized into significant message, and provides the transmission control flow such as transmission Wrong control.Tool
Say body, be exactly frame, arbitration, response, the detection of mistake or the report of message.The function of data link layer is generally in CAN controls
Performed in the hardware of device processed.
Physical layer defines the actual sending method of signal, bit timing, the coded system of position and the step of synchronization.But it is specific
Ground says, signal level, communication speed, sampled point, electrical characteristic, the form of connector of driver and bus etc. are undefined.
These must be by user according to system, and these functions are typically realized by CAN transceiver.
At present, a CAN system is mainly comprised the following steps connects the first CAN signal receipts by CAN
Send out terminal, CAN transceiver, CAN controller and executive component (sensor) of device etc..
If CAN system will be applied to essential safety (abbreviation intrinsic safety) field of explosion, need by various safe designs, with
Avoid the problems such as non-security signal for flowing into place of safety enters hazardous area and triggers danger.
The content of the invention
The shortcoming of prior art in view of the above, the purpose of present patent application is to provide for intrinsic safe explosion-proof field
CAN signal transmitting device, solves problem of the prior art, lifts the security of the CAN signal transmission for intrinsic safe explosion-proof field.
In order to achieve the above objects and other related objects, present patent application provides a kind of CAN for intrinsic safe explosion-proof field
Signal transmitting apparatus, including：At least one first CAN signal transmission line part, it includes：For connecting hazardous area external equipment
The first CAN signal transceiver and the limit energy that is connected between the first CAN signal transceiver and hazardous area external equipment
Protection module；The first CAN signal transceiver includes：First RXD ends and the first TXD ends；At least one second CAN signal is transmitted
Circuit pack, including：The second CAN signal transceiver for connecting place of safety external equipment；The second CAN signal transceiver
It includes：2nd RXD ends and the 2nd TXD ends；First isolation transmitter part, its sending side and receiving side communicate to connect described respectively
First RXD ends and the 2nd TXD ends；Second isolation transmitter part, its sending side and receiving side communicate to connect the 2nd RXD respectively
End and the first TXD ends.
In an embodiment of present patent application, the limit energy protection module includes：Connected intrinsic safety limit can module and EMC
Immunity module.
In an embodiment of present patent application, the intrinsic safety limit energy module connection hazardous area external equipment, the EMC resists
Interference module connects the intrinsic safety limit can module, the EMC immunity modules connection the first CAN signal transceiver.
In an embodiment of present patent application, the limit energy protection module includes：For connection hazardous area external equipment
First CANH signal ends and the first CANL signal ends；And for connection the first CAN signal transceiver the 2nd CANH signal ends and
And the 2nd CANL signal end.
In an embodiment of present patent application, the intrinsic safety limit energy module includes：First resistor, one end is connected to described
First CANH signal ends, its other end is connected to the 2nd CANH signal ends；Second resistance, one end is connected to described first
CANL signal ends, its other end is connected to the 2nd CANL signal ends；At least two branch roads, are connected to the 2nd CANH letters
Number end the 2nd CANL signal ends between；Every the branch road includes：Two voltage-regulator diodes；Described two voltage-regulator diodes
Negative electrode is connected, the anodes of described two voltage-regulator diodes be respectively connecting to the first resistor the other end and second resistance it is another
One end.
In an embodiment of present patent application, the EMC immunity modules include：It is connected to the 2nd CANH signals
Hold and at least one tie point between the 2nd CANL signal ends and at least one the second branch roads；The tie point includes：
First diode and the second diode, negative electrode is connected and anode is respectively connecting to the 2nd CANH signal ends and the 2nd CANL letters
Number end；The negative electrode of first diode and the second diode is connected to one first common port；Second branch road includes：3rd
Diode and the 4th diode, anode is connected and negative electrode is respectively connecting to the 2nd CANH signal ends and the 2nd CANL signals
End；The anode of 3rd diode and the 4th diode is connected to one second common port；TVS pipe, its two ends are respectively connecting to
First common port and the second common port；5th diode, its negative electrode connects first common port, its plus earth；The
Six diodes, its anode connects second common port, its minus earth.
In an embodiment of present patent application, the hazardous area external equipment includes：Described is connected by CAN
The terminal of one CAN signal transceiver；The place of safety external equipment includes：CAN controller.
In an embodiment of present patent application, described CAN signal transmitting device, including：First CAN signal control electricity
Road, including：First switch device and the first logical device；The first switch device, it has the first connection end, the second connection
End and the first control end for controlling first connection end and the second connection end break-make；First connection end connects institute
The first RXD ends are stated, second connection end connects the sending side of the first isolation transmitter part, the first TXD ends communication
It is connected to first control end；Second CAN signal controls circuit, including：Second switch device and the second logical device；It is described
Second switch device, it has the 3rd connection end, the 4th connection end and for controlling the 3rd connection end and the 4th connection end
Second control end of break-make；3rd connection end connects the 2nd RXD ends, the 4th connection end connection described second every
From the sending side of transmission apparatus, the 2nd TXD ends are communicatively coupled to second control end.
In an embodiment of present patent application, the reverser of the two-stage series connection of the first TXD ends one is connected to first
Control end；The reverser of the two-stage series connection of 2nd TXD ends one is connected to the second control end.
In an embodiment of present patent application, the first isolation transmitter part and/or the second isolation transmitter part bag
Include：Magnetic coupling transmission device, optical coupling transmission apparatus or optical fiber.
As described above, present patent application provides a kind of CAN signal transmitting device for intrinsic safe explosion-proof field, including：Extremely
Few one first CAN signal transmission line part, it includes：For connect hazardous area external equipment the first CAN signal transceiver,
And it is connected to the limit energy protection module between the first CAN signal transceiver and hazardous area external equipment；First CAN
Signal transceiver includes：First RXD ends and the first TXD ends；At least one second CAN signal transmission line part, including：For even
Connect the second CAN signal transceiver of place of safety external equipment；The second CAN signal transceiver it include：2nd RXD ends and
Two TXD ends；First isolation transmitter part, its sending side and receiving side communicate to connect the first RXD ends and the 2nd TXD respectively
End；Second isolation transmitter part, its sending side and receiving side communicate to connect the 2nd RXD ends and the first TXD ends respectively, realize
CAN signal is transmitted in the two-way isolation of physical layer, while meeting intrinsic safe explosion-proof requirement.
Brief description of the drawings
Fig. 1 is shown as the circuit module schematic diagram of present patent application CAN signal transmitting device in an embodiment.
Fig. 2 is shown as the circuit theory schematic diagram of limit energy protection module of the present patent application in an embodiment
Fig. 3 is shown as the circuit theory schematic diagram of present patent application CAN signal transmitting device in an embodiment.
Component label instructions
11 first CAN signal transmission line parts
111 first CAN signal transceivers
112 limits can protection module
113 first CAN signals control circuit
12 second CAN signal transmission line parts
121 second CAN signal transceivers
122 second CAN signals control circuit
13 first isolation transmitter parts
14 second isolation transmitter parts
Embodiment
Illustrate the embodiment of present patent application below by way of specific instantiation, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages and effect of present patent application easily.Present patent application can also be by addition
Different embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints with answering
With, without departing from present patent application spirit under carry out various modifications or alterations.It should be noted that, in situation about not conflicting
Under, the feature in following examples and embodiment can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates the basic of present patent application in a schematic way
Conception, then in schema only display with relevant component in present patent application rather than according to component count during actual implement, shape
And size is drawn, it is actual when implementing, and kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout
Kenel may also be increasingly complex.
Referring to Fig. 1, in order to which CAN signal transmission is applied into intrinsic safe explosion-proof field, improving signal transmission rate, reduction connects
Line cost etc., present patent application provides a kind of CAN signal transmitting device for intrinsic safe explosion-proof field, including：At least one first
CAN signal transmission line part 11, at least one second CAN signal transmission line part 12, the first isolation transmitter part 13 and
Two isolation transmitter parts 14.
The first CAN signal transmission line part 11, it includes：The first CAN for connecting hazardous area external equipment
Signal transceiver 111 and the limit being connected between the first CAN signal transceiver 111 and hazardous area external equipment can be protected
Protect module 112；The first CAN signal transceiver 111 includes：First RXD ends and the first TXD ends.
The second CAN signal transmission line part 12, it includes：2nd RXD ends and the 2nd TXD ends；2nd CAN
Signal transmission line part 12 includes：Second CAN signal transceiver 121；The second CAN signal transceiver 121 includes：Second
RXD ends and the 2nd TXD ends.
The first isolation transmitter part 13, its sending side and receiving side communicate to connect the first RXD ends and respectively
Two TXD ends, form the first transmission channel to transmit the signal that the first RXD ends are sent to the 2nd TXD ends for connection.
The second isolation transmitter part 14, its sending side and receiving side communicate to connect the 2nd RXD ends and respectively
One TXD ends, form the second transmission channel to transmit the signal that the 2nd RXD ends are sent to the first TXD ends for connection.
In an embodiment, the first isolation transmitter part 13 and the second isolation transmitter part 14 can be that magnetic coupling is passed
Any one of defeated device, optical coupling transmission apparatus or optical fiber, in Fig. 3 embodiment, use optical coupling transmission
Mode.
In an embodiment, described CAN signal transmitting device, in addition to：First CAN signal controls circuit 113 and the
Two CAN signals control circuit 122；First CAN signal control circuit 113 is connected to the first RXD ends and the first isolation transmitter part
Between 13, and its control end having connects the first TXD ends；Second CAN signal control circuit 122 is connected to second
Between RXD ends and the second isolation transmitter part 14, and its control end having connects the 2nd TXD ends.
In an embodiment of present patent application, the limit energy protection module 112 includes：Connected intrinsic safety limit can module and
EMC immunity modules；The intrinsic safety limit energy module connection hazardous area external equipment, the EMC immunity modules connect described
Peace limit can module, the EMC immunity modules connection the first CAN signal transceiver 111 or the second CAN signal transceiver
121。
CAN signal first passes around intrinsic safety limit energy module, limits non-intrinsic safety before the first CAN signal transceiver 111 is entered
Voltage, electric current and energy, it is to avoid the energy of non-intrinsic safety side enters hazardous side and set off an explosion；Then EMC anti-jamming circuits are passed through,
This circuit mainly absorbs the EMC interference such as EMC interference, including electric fast-pulse group impact, surge, electrostatic, so as to improve passage
Antijamming capability.
Certainly, the outside CANH signal ends of the second CAN signal transceiver 121 and CANL signal ends can also connect one
The limit energy protection module, to cause two ends to connect hazardous area external equipment, versatility is good and can prevent reversed；It is preferred that
, it is anti-interference that the outside CANH signal ends of the second CAN signal transceiver 121 and CANL signal ends can also connect an EMC
Module, is disturbed with trap signal.
Illustrate the CAN signal transmitting procedure of present patent application device：
First CAN signal transceiver 111 monitors the CAN signal of CAN, and CAN signal is by limit energy protection module 112
After protection, into the first CAN signal transceiver 111, emulation bus signal is converted into corresponding digital bit stream, by the first RXD
End sends CAN data frames, and the of the second CAN signal transceiver 121 of place of safety is transferred to by the first isolation transmitter part 13
Two TXD ends, the second CAN signal transceiver 121 will receive the CAN data frames of hazardous area transmission, be sent to the CAN controls of rear end
Device.
Specifically, CAN data frames originate (Start of), arbitration domain (Arbitration Field), control domain control by frame
Domain (Control Field) processed, data field (DataField), CRC domains (CRC Field), Acknowledge (ACK Field) and frame
End up (End of) composition.Wherein Acknowledge is receives affirmation mechanism, for ensureing that at least one recipient is properly received；Send
Side is sent in CAN signal comprising 1 recessive position (" 1 ")；Any recipient receives data, then dominant to sender's transmission 1
Position (" 0 ") is to show response, and " 0 " can cover " 1 "；Sender can also receive while sending, wait sender being received
The Acknowledge of CAN signal detects 1 dominant bit " 0 ", then sender thinks that this frame is sent correctly.
Therefore, after CAN controller receives the CAN data frames, reply comprising dominant bit " 0 " signal (ACK) to show
Receive successfully, the second CAN signal transceiver 121 sends this ack signal by its 2nd RXD end, and is passed by the second isolation
Defeated device 14 is transferred to the first CAN signal transceiver 111, and its first TXD end receives this ack signal, is converted into corresponding mould
Intend bus signals, and control circuit 113 to be hidden by this dominant bit unsteady state operation in the ack signal by the first CAN signal
Property position, it is ensured that the Acknowledge of the transmission frame transmitted by the first CAN signal transceiver 111 includes recessive position；So as to successfully realize CAN
Signal is transmitted in the two-way isolation of physical layer, while meeting intrinsic safe explosion-proof requirement.
As shown in Fig. 2 showing the structure of the limit energy protection module 112, the structure includes：For being set outside connection hazardous area
Standby the first CANH signal ends (CANH on right side) and the first CANL signal ends (CANL on right side)；And for the first CAN of connection
The 2nd CANH signal ends (CANH in left side) and and the 2nd CANL signal ends (CANL in left side) of signal transceiver 111.
The intrinsic safety limit energy module includes：First resistor R3, one end is connected to the first CANH signal ends, its other end
It is connected to the 2nd CANH signal ends；Second resistance R4, one end is connected to the first CANL signal ends, the connection of its other end
To the 2nd CANL signal ends；At least two branch roads, be connected to the 2nd CANH signal ends and the 2nd CANL signal ends it
Between；Every the branch road includes：Two voltage-regulator diodes Z1 and Z2, or Z3 and Z4；Described two voltage-regulator diode Z1 and Z2, or
Z3 is connected with Z4 negative electrode, and the anode of described two voltage-regulator diodes is respectively connecting to the other end and of the first resistor R3
The two resistance R4 other end.
The EMC immunity modules include：It is connected between the 2nd CANH signal ends and the 2nd CANL signal ends
At least one tie point and at least one the second branch roads；The tie point includes：First diode D1 and the second diode
D3, negative electrode is connected and anode is respectively connecting to the 2nd CANH signal ends and the 2nd CANL signal ends；First diode
D1 and the second diode D3 negative electrode are connected to one first common port；Second branch road includes：3rd diode D2 and the 4th
Diode D4, anode is connected and negative electrode is respectively connecting to the 2nd CANH signal ends and the 2nd CANL signal ends；Described 3rd
Diode D2 and the 4th diode D4 anode are connected to one second common port；TVS pipe TVS1, its two ends are respectively connecting to described
First common port and the second common port；5th diode D5, its negative electrode connects first common port, its plus earth；6th
Diode D6, its anode connects second common port, its minus earth.
Specifically, CAN signal first has to pass through R3 before the first CAN signal transceiver 111 is entered, R4, Z1, Z2, Z3,
The intrinsic safety limit energy circuit of Z4 compositions, intrinsic safety limit energy module is by specific voltage-stabiliser tube and resistance, to limit voltage, the electricity of non-intrinsic safety
Stream and energy, it is to avoid the energy of non-intrinsic safety side enters hazardous side, and sets off an explosion.
Specifically, CAN signal is after intrinsic safety limits energy module, into what is be made up of D1, D2, D3, D4, D5, D6 and TVS1
EMC anti-jamming circuits, this circuit mainly absorbs the EMC interference such as EMC interference, including electric fast-pulse group impact, surge, electrostatic.
When EMC interference (magnitude of voltage exceedes the voltage of TVS pipe) seals in loop,
1) it is line interference to ground：If the 2nd CANH signal ends are just (i.e. the 2nd CANL signal ends are negative), interference signal
Ground terminal is returned to after D3, TVS1 and D6, so as to absorb interference.If the 2nd CANH signal ends are negative (i.e. the 2nd CANL signal ends
For just), then interference signal is by D2, TVS1 and D5 to ground.
2) disturbed for Line To Line：If the 2nd CANH signal ends are just (i.e. the 2nd CANL signal ends are negative), interference signal
The 2nd CANL signal ends are returned to through D3, TVS1 and D4.If the 2nd CANH signal ends are negative (i.e. the 2nd CANL signal ends is just),
Interference signal through D1, TVS1 and D2 return to the 2nd CANH signal ends so as to avoid interference signal seal in after terminal shortcircuit.
Further, since equivalent capacity is formed in parallel by D1, D2 and TVS1 three's equivalent capacity between CANH and CANL, because
This equivalent capacity is very small, so that while EMC interference is absorbed, it is ensured that the normal transmission of CAN signal.
Also referring to Fig. 1 and Fig. 3, to illustrate that it is former that the CAN signal of CAN signal control device of present patent application is transmitted
Reason：
Specifically, U1 is the first CAN signal transceiver, its pin 6 is the first CANH signal ends, and pin 7 is the first CANL
Signal end, pin 4 is the receiving side (pin 6) that the first RXD ends connect the second isolation transmitter part O1, and its pin 1 is the first TXD
End；The first CAN signal control circuit includes：First switch device U2 and the first logical device；The first switch device
U2, its have the first connection end (pin 1), the second connection end (pin 2) and for control first connection end and second connect
Connect the first control end (pin 4) of end break-make；First connection end (pin 1) connects the first RXD ends, and described second connects
The sending side (pin 3) that end (pin 2) connects the first isolation transmitter part O2 is connect, the first TXD ends are through R5 connections institute
The input (pin 2) of the first logical device is stated, the output end of first logical device connects first control end.
U5 is the second CAN signal transceiver, and its pin 6 is the 2nd CANL signal ends, and pin 7 is the 2nd CANH signal ends,
Pin 4 is the 2nd RXD ends, and its pin 1 is the receiving side (pin 6) that the 2nd TXD ends connect the first isolation transmitter part O2；It is described
Second CAN signal controls circuit, including：Second switch device U6 and the second logical device (two reverser U7 of series connection and
U8)；The second switch device U6, it has the 3rd connection end (pin 1), the 4th connection end (pin 2) and for controlling
State the second control end (pin 4) of the 3rd connection end and the 4th connection end break-make；3rd connection end (pin 1) connection is described
2nd RXD ends (pin 4), the 4th connection end (pin 2) connects the sending side (pin of the second isolation transmitter part O1
3), input of the first TXD ends (pin 1) through resistance R12 connections second logical device (being made up of U7 and U8) (connects
Pin 2), the output end of second logical device connects second control end.
First logical device is made up of the reverser U3 and U4 connected, and second logical device is reverse by what is connected
Device U7 and U8 are constituted, and for leading directly to TXD signals and eliminating interference, can also not need described first in other embodiments certainly
Logical device and the second logical device, are not limited with Fig. 3 embodiments；Present patent application is controlled using the signal at TXD ends
The on off state of switch element.
In figure, the circuit of CAN transmitting devices is full symmetric, therefore can transmit CAN signal with two-way isolation.
Principle analysis only is transmitted by taking a direction transmission channel as an example, another direction transmission principle is identical.Simultaneously
It is assumed that the first CAN signal transceiver (U1) access CAN on right side, the second CAN signal transceiver (U2) access CAN in left side
Controller.
CAN signal isolated transmission principle is following (data transfer direction is from right to left)：
U1 monitors CAN, and the analog signal in bus is converted into corresponding digital bit stream, i.e. CAN data frames.By U1
The first RXD ends send, but its data send by U1 the first TXD ends signal and be made up of U2, U3, U4 first
CAN control circuit controls；When U1 the first RXD ends send data frame, the first TXD ends are constantly in high level, pass through first
Logical device (U3 and U4) (can certainly directly connect) is delivered to U2 the first control end, and U2 switch closures, data frame leads to
Cross U1 the first RXD rectify it is normal send, after transmission terminates, U1 the first RXD ends are driven high, and are isolated by O2 and are transferred to the of U5
Data frame is sent to the CAN controller of rear end by two TXD ends, U5, and CAN controller is replied the ACK for including 1 dominant bit, passed through
U5 the 2nd RXD ends are sent.But this ACK transmission is by the 2nd CAN being made up of U5 the 2nd TXD end signals and U6, U7, U8
Control circuit control；After terminating due to the data frame transmission at the first RXD ends, U1 the first RXD ends level is driven high, therefore O2
Light emitting diode is not turned on, and the TXD for making U5 is high level, through the second logical device (U7 and U8) (can certainly directly connect)
To U6 the second control end, U6 switch closures are made, the ACK for including 1 dominant bit is isolated by U5 the 2nd RXD ends through O1
U1 the first TXD ends are transferred to, so that the analog signal 1 dominant bit ACK is converted in CAN is sent, dominant bit is
" 0 " makes U1 the first TXD ends be low level, is delivered to the first control end and makes U2 disconnect, and prevents U1 the first RXD ends from sending dominant
Position, it is to avoid bus is paralysed.
So far, a CAN data frame is sent completely, and successfully realizes that CAN signal is transmitted in the two-way isolation of physical layer.
In summary, present patent application provides a kind of CAN signal transmitting device for intrinsic safe explosion-proof field, including：Extremely
Few one first CAN signal transmission line part, it includes：For connect hazardous area external equipment the first CAN signal transceiver,
And it is connected to the limit energy protection module between the first CAN signal transceiver and hazardous area external equipment；First CAN
Signal transceiver includes：First RXD ends and the first TXD ends；At least one second CAN signal transmission line part, including：For even
Connect the second CAN signal transceiver of place of safety external equipment；The second CAN signal transceiver it include：2nd RXD ends and
Two TXD ends；First isolation transmitter part, its sending side and receiving side communicate to connect the first RXD ends and the 2nd TXD respectively
End；Second isolation transmitter part, its sending side and receiving side communicate to connect the 2nd RXD ends and the first TXD ends respectively, realize
CAN signal is transmitted in the two-way isolation of physical layer, while meeting intrinsic safe explosion-proof requirement.
The principle and its effect of above-described embodiment only illustrative present patent application, not for limitation this patent Shen
Please.Any person skilled in the art can all be carried out without prejudice under the spirit and scope of present patent application to above-described embodiment
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in present patent application
God and all equivalent modifications completed under technological thought or change, should be covered by the claim of present patent application.
Claims (10)
1. a kind of CAN signal transmitting device for intrinsic safe explosion-proof field, it is characterised in that including：
At least one first CAN signal transmission line part, it includes：The first CAN signal for connecting hazardous area external equipment
Transceiver and the limit energy protection module being connected between the first CAN signal transceiver and hazardous area external equipment；It is described
First CAN signal transceiver includes：First RXD ends and the first TXD ends；
At least one second CAN signal transmission line part, including：The second CAN signal for connecting place of safety external equipment is received
Send out device；The second CAN signal transceiver it include：2nd RXD ends and the 2nd TXD ends；
First isolation transmitter part, its sending side and receiving side communicate to connect the first RXD ends and the 2nd TXD ends respectively；
Second isolation transmitter part, its sending side and receiving side communicate to connect the 2nd RXD ends and the first TXD ends respectively.
2. CAN signal transmitting device according to claim 1, it is characterised in that the limit energy protection module includes：It is connected
Intrinsic safety limit can module and EMC immunity modules.
3. CAN signal transmitting device according to claim 2, it is characterised in that the intrinsic safety limit can module connection danger
Area's external equipment, the EMC immunity modules connect the intrinsic safety limit can module, the EMC immunity modules connection described the
One CAN signal transceiver.
4. CAN signal transmitting device according to claim 2, it is characterised in that the limit energy protection module includes：For even
Connect the first CANH signal ends and the first CANL signal ends of hazardous area external equipment；And for the first CAN signal transceiver of connection
The 2nd CANH signal ends and and the 2nd CANL signal ends.
5. CAN signal transmitting device according to claim 4, it is characterised in that the intrinsic safety limit energy module includes：
First resistor, one end is connected to the first CANH signal ends, and its other end is connected to the 2nd CANH signal ends；
Second resistance, one end is connected to the first CANL signal ends, and its other end is connected to the 2nd CANL signal ends；
At least two branch roads, are connected between the 2nd CANH signal ends and the 2nd CANL signal ends；The every branch road bag
Include：Two voltage-regulator diodes；The negative electrode of described two voltage-regulator diodes is connected, and the anode of described two voltage-regulator diodes connects respectively
It is connected to the other end of the first resistor and the other end of second resistance.
6. CAN signal transmitting device according to claim 4, it is characterised in that the EMC immunity modules include：
It is connected at least one tie point and at least one between the 2nd CANH signal ends and the 2nd CANL signal ends
Second branch road；The tie point includes：First diode and the second diode, negative electrode is connected and anode be respectively connecting to it is described
2nd CANH signal ends and the 2nd CANL signal ends；It is public that the negative electrode of first diode and the second diode is connected to one first
Hold altogether；Second branch road includes：3rd diode and the 4th diode, anode is connected and negative electrode is respectively connecting to described second
CANH signal ends and the 2nd CANL signal ends；It is public that the anode of 3rd diode and the 4th diode is connected to one second
End；
TVS pipe, its two ends are respectively connecting to first common port and the second common port；
5th diode, its negative electrode connects first common port, its plus earth；
6th diode, its anode connects second common port, its minus earth.
7. CAN signal transmitting device according to claim 1, it is characterised in that the hazardous area external equipment includes：It is logical
Cross the terminal that CAN connects the first CAN signal transceiver；The place of safety external equipment includes：CAN controller.
8. CAN signal transmitting device according to claim 1, it is characterised in that including：
First CAN signal controls circuit, including：First switch device and the first logical device；The first switch device, it has
There are the first connection end, the second connection end and the first control end for controlling first connection end and the second connection end break-make；
First connection end connects the first RXD ends, and second connection end connects the transmission of the first isolation transmitter part
Side, the first TXD ends are communicatively coupled to first control end；
Second CAN signal controls circuit, including：Second switch device and the second logical device；The second switch device, it has
There are the 3rd connection end, the 4th connection end and the second control end for controlling the 3rd connection end and the 4th connection end break-make；
3rd connection end connects the 2nd RXD ends, and the 4th connection end connects the transmission of the second isolation transmitter part
Side, the 2nd TXD ends are communicatively coupled to second control end.
9. CAN signal transmitting device according to claim 8, it is characterised in that the two-stage series connection of the first TXD ends one
Reverser be connected to the first control end；The reverser of the two-stage series connection of 2nd TXD ends one is connected to the second control end.
10. CAN signal transmitting device according to claim 1, it is characterised in that the first isolation transmitter part and/
Or second isolation transmitter part include：Magnetic coupling transmission device, optical coupling transmission apparatus or optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720054433.4U CN206389387U (en) | 2017-01-17 | 2017-01-17 | CAN signal transmitting device for intrinsic safe explosion-proof field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720054433.4U CN206389387U (en) | 2017-01-17 | 2017-01-17 | CAN signal transmitting device for intrinsic safe explosion-proof field |
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| CN206389387U true CN206389387U (en) | 2017-08-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789518A (en) * | 2017-01-17 | 2017-05-31 | 上海辰竹仪表有限公司 | For the CAN signal transmitting device in intrinsic safe explosion-proof field |
| WO2020140526A1 (en) * | 2019-01-04 | 2020-07-09 | 珠海格力电器股份有限公司 | Can waveform simulation device and method, and can waveform transmitter |
-
2017
- 2017-01-17 CN CN201720054433.4U patent/CN206389387U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106789518A (en) * | 2017-01-17 | 2017-05-31 | 上海辰竹仪表有限公司 | For the CAN signal transmitting device in intrinsic safe explosion-proof field |
| WO2020140526A1 (en) * | 2019-01-04 | 2020-07-09 | 珠海格力电器股份有限公司 | Can waveform simulation device and method, and can waveform transmitter |
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