CN208820779U - A kind of Bus isolation transmission circuit peculiar to vessel - Google Patents
A kind of Bus isolation transmission circuit peculiar to vessel Download PDFInfo
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- CN208820779U CN208820779U CN201821701629.9U CN201821701629U CN208820779U CN 208820779 U CN208820779 U CN 208820779U CN 201821701629 U CN201821701629 U CN 201821701629U CN 208820779 U CN208820779 U CN 208820779U
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- optical coupling
- photoelectrical coupler
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Abstract
The utility model discloses a kind of Bus isolation transmission circuits peculiar to vessel, including NMEA2000 bus, CAN transceiver and CAN controller；The CAN transceiver is connect with NMEA2000 bus；Also there is isolation circuit, the isolation circuit includes the first optical coupling isolation circuit and the second optical coupling isolation circuit between the CAN transceiver and CAN controller.A kind of Bus isolation transmission circuit peculiar to vessel of the utility model, isolation circuit use the first optical coupling isolation circuit and the second optical coupling isolation circuit, meet DC and AC insulation request, and be able to satisfy strict demand of the maritime frequency bands to parasitic radiation again.
Description
Technical field
The utility model relates to ship communication technical fields, more particularly to a kind of Bus isolation transmission circuit peculiar to vessel.
Background technique
NMEA2000 is the maritime communication bus protocol to grow up on the basis of automobile CAN-bus, it uses a letter
Single cable system replaces the mutual contact mode of a plurality of cable used now.NMEA2000 is adapted to navigating equipment, generator
Group, turbine, navigation, rudder system, fire alarm and the requirement of control.The same cable is all enjoyed in data and instruction transmission, and backbone network is long
Up to 250Kbits/ seconds traffic rate can be supported in the case of 250 meters of degree.NMEA2000 is self-configuring, without setting, also not
Need controller.In the case where not closing network, equipment can be added or remove.
To prevent the interference and damage of other equipment and signal to NMEA2000 network, NMEA2000 protocol physical layers are wanted
Ask NMEA2000 circuit that must be isolated with communication equipment, index request: (any outside with the non-NMEA2000 of equipment is isolated in DC
Impedance between terminal) it is not less than 100K Ω；(with the capacitance between any external terminal of the non-NMEA2000 of equipment) is isolated no in AC
Greater than 100pF.
The CAN transceiver IC, such as Analog being applicable on current some automobiles for doing quarantine measures using integrated transformer
The ADM3054 of Devices has encoding and decoding although can meet DC the and AC insulation request of NMEA2000 inside such IC
Device needs timing (1 microsecond of interval) to refresh codec, this can generate some unnecessary parasitic radiation signals to cause sea
The EMC performance of thing frequency range is not up to standard.
In addition, the end BUS (NET-H and NET-L) of standard requirements NMEA2000 require to bear certain voltage misconnection and
It is not damaged, existing standard is ± 18V.But the receiving voltage of new standard ± 36V will be implemented.The common CAN of NMEA2000
Transceiver ic is TI
ISO1050, this IC carry isolation features, can meet DC the and AC insulation request of NMEA2000, but its bus
Terminal can only bear -27V ~+40V misconnection voltage, not be able to satisfy the receiving voltage of new standard ± 36V.
Utility model content
In order to meet DC the and AC insulation request of NMEA2000 specification, and parasitic radiation is not generated, the utility model provides
A kind of Bus isolation transmission circuit peculiar to vessel.
A kind of Bus isolation transmission circuit peculiar to vessel provided by the utility model, including NMEA2000 bus, CAN transceiver and
CAN controller；The CAN transceiver is connect with NMEA2000 bus；Also have between the CAN transceiver and CAN controller
Isolation circuit, the isolation circuit include the first optical coupling isolation circuit and the second optical coupling isolation circuit.One kind of the utility model
Bus isolation transmission circuit peculiar to vessel, isolation circuit use the first optical coupling isolation circuit and the second optical coupling isolation circuit, meet DC and
AC insulation request, and it is able to satisfy strict demand of the maritime frequency bands to parasitic radiation again.
Further, the CAN transceiver includes data receiver and data sending terminal, and the CAN controller, which has, to be connect
Receiving end and transmitting terminal；First optical coupling isolation circuit be connected to CAN transceiver data receiver and CAN controller receiving end it
Between；Second optical coupling isolation circuit is connected between CAN transceiver data sending terminal and CAN controller transmitting terminal.
NMEA2000 bus data realizes differential to single-ended data conversion by CAN transceiver, is connect by CAN transceiver data
The input terminal of the second optical coupling isolation circuit of receiving end feed-in, after the conversion of the second optical coupling isolation circuit, by the second optical coupling isolation circuit
Output end be output to CAN controller receiving end and by CAN controller carry out follow-up data processing.
The input terminal of the first optical coupling isolation circuit of data feed-in from CAN controller transmitting terminal, by the first optocoupler every
After Phototube Coupling conversion from circuit, the data sending terminal of feed-in CAN transceiver (, single-ended-difference number is realized by CAN transceiver
According to converting and be fed in NMEA2000 bus and received by other equipment.
Further, first optical coupling isolation circuit includes the first photoelectrical coupler, first photoelectrical coupler
Input anode is connect by the first pull-up resistor with the first power supply；The input cathode and CAN of first photoelectrical coupler control
The connection of device transmitting terminal；The collector of first photoelectrical coupler is connect with CAN transceiver data transmitting terminal；First photoelectricity
The emitter of coupler is grounded.
Further, second optical coupling isolation circuit includes the second photoelectrical coupler, second photoelectrical coupler
Input anode is connect by the second pull-up resistor with second source；The input cathode and CAN of second photoelectrical coupler are received and dispatched
The connection of device receiving end；The collector of second photoelectrical coupler is connect with CAN controller receiving end；Second photoelectric coupling
The emitter of device is grounded.
Further, the CAN transceiver is SN65HVD251.
Further, the CAN transceiver is the one of which in TLE6250, PCA82C251, SN65HVD233.
A kind of Bus isolation transmission circuit peculiar to vessel of the utility model, using general CAN transceiver SN65HVD251, or it is same
Any of them in performance person TLE6250, PCA82C251, SN65HVD233, the reachable ± 36V of error connection proof voltage.It can expire
Sufficient new standard requires the end BUS of NMEA2000 to require energy receiving ± 36V voltage misconnection without impaired requirement.And it will not generate
Parasitic radiation is to cause the EMC performance of maritime frequency bands not up to standard.
Further, the NMEA2000 bus further includes bus power source connecting pin；The end the CAN transceiver VCC and total
There is voltage conversion circuit between line power connector end.Because the supply voltage of CAN transceiver requires, generally no more than
7V, and the supply voltage range of NMEA2000 bus is 9V ~ 36V, voltage conversion circuit can be voltage step-down to work appropriate
Make voltage.
Further, the voltage conversion circuit includes DC-DC converter.
Further, the voltage conversion circuit further includes filter capacitor.
Further, the output voltage terminal of the first optical coupling isolation circuit is connect with the output end of the voltage conversion circuit；
The input anode of first optical coupling isolation circuit is connect by the second pull-up resistor with the output end of the voltage conversion circuit.
Further, the NMEA2000 bus includes data signal bus end；The end BUS of CAN transceiver with
The data signal bus end of NMEA2000 bus connects.
The utility model has the advantages that
1, the utility model uses the first optical coupling isolation circuit and the second optical coupling isolation circuit, meets DC and AC isolation and wants
It asks, and parasitic radiation will not be generated to cause the EMC performance of maritime frequency bands not up to standard.
2, further, the reachable ± 36V of error connection proof voltage.Can satisfy new standard requires the end BUS of NMEA2000 to want
Ask energy receiving ± 36V voltage misconnection without impaired requirement.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of Bus isolation transmission circuit peculiar to vessel provided by the utility model embodiment；
Fig. 2 is a kind of circuit diagram of Bus isolation transmission circuit peculiar to vessel provided by the utility model embodiment.
Appended drawing reference:
1-NMEA2000 bus, 2- voltage conversion circuit, 3-CAN transceiver, 4- isolation circuit, 5-CAN controller, 11-
Data signal bus end, 12- bus power source connecting pin, the first optical coupling isolation circuit of 41-, the second optical coupling isolation circuit of 42-.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
It is shown in Figure 1, a kind of Bus isolation transmission circuit peculiar to vessel provided by the embodiment of the utility model, including
NMEA2000 bus 1, CAN transceiver 3 and CAN controller 5；The CAN transceiver 3 is connect with NMEA2000 bus 1；It is described
Also there is isolation circuit 4, the isolation circuit 4 includes the first optical coupling isolation circuit 41 between CAN transceiver 3 and CAN controller 5
With the second optical coupling isolation circuit 42.A kind of Bus isolation transmission circuit peculiar to vessel of the utility model, CAN controller 5 can be with general
Logical controller, isolation circuit use the first optical coupling isolation circuit and the second optical coupling isolation circuit, meet DC and AC insulation request,
And parasitic radiation will not be generated to cause the EMC performance of maritime frequency bands not up to standard, maritime frequency bands is able to satisfy to parasitic radiation
It is strict with.
It is shown in Figure 2, specifically, CAN controller 5 includes receiving end CAN-RX and transmitting terminal CAN-TX.CAN transmitting-receiving
Device 3 be specially CAN transceiver U1, with data receiver RXD(U1 4 feet) and data sending terminal TXD(U1 1 foot).Second
Optical coupling isolation circuit 42 is connected to the receiving end CAN-RX of CAN controller 5 and the data receiver RXD(4 foot of CAN transceiver 3)
Between；First optical coupling isolation circuit 41 is connected to the data sending terminal TXD(1 foot of CAN transceiver 3) and CAN controller 5 transmission
It holds between CAN-TX.
Working principle is as follows:
Data from NMEA2000 bus realize differential to single-ended data conversion by CAN transceiver 3, by CAN transceiver
4 feet of 3 data receiver RXD(U1) the second optical coupling isolation circuit of feed-in 42 input terminal, through the second optical coupling isolation circuit 42
After conversion, the receiving end CAN-RX of CAN controller 5 is output to by the output end of the second optical coupling isolation circuit 42 and is controlled by CAN
Device carries out follow-up data processing.
The input terminal of the first optical coupling isolation circuit of data feed-in 41 of transmitting terminal CAN-TX from CAN controller 5 passes through
After the Phototube Coupling conversion of first optical coupling isolation circuit 41,1 foot of the data sending terminal TXD(U1 of feed-in CAN transceiver 3), by
CAN transceiver 3 realizes that single-ended-differential data is converted and is fed in NMEA2000 bus and received by other equipment.
As shown in Fig. 2, the first optical coupling isolation circuit 41 includes the first photoelectrical coupler Q1, the input of the first photoelectrical coupler
Positive (the 1st foot of Q1) is connect by the first pull-up resistor R427 with the first power supply (3V3), in a specific embodiment, the
One power supply is 3V power supply.The transmitting terminal CAN-TX of input cathode (the 3rd foot of Q1) and CAN controller of first photoelectrical coupler Q1
Connection.1 foot of the data transmitting terminal TXD(U1 of the collector (the 5th foot of Q1) and CAN transceiver 3 of first photoelectrical coupler Q1)
Connection.The emitter (4 feet of U1) of first photoelectrical coupler Q1 is grounded.
Second optical coupling isolation circuit 42 includes the input anode (Q2 of the second photoelectrical coupler Q2, the second photoelectrical coupler Q2
The 1st foot) connect with second source (5V_N2K) by the second pull-up resistor R429, in a specific embodiment, second is electric
Source is 5V power supply.The data receiver RXD(U1 of input cathode (the 3rd foot of Q2) and CAN transceiver of second photoelectrical coupler Q2
4 feet) connection.The collector (the 5th foot of Q2) of second photoelectrical coupler Q2 is connect with the receiving end CAN-RX of CAN controller 5.
The emitter (the 4th foot of Q2) of second photoelectrical coupler Q2 is grounded.
Preferably, the CAN transceiver 3, specially CAN transceiver U1, model SN65HVD251.
As the alternative solution of CAN transceiver 3, the CAN transceiver 3, specially CAN transceiver U1, model CAN are received
Sending out device is the one of which in TLE6250, PCA82C251, SN65HVD233.
A kind of Bus isolation transmission circuit peculiar to vessel of the utility model, using general CAN transceiver SN65HVD251, or it is same
Any of them in performance person TLE6250, PCA82C251, SN65HVD233, the reachable ± 36V of error connection proof voltage.It can expire
Sufficient new standard requires the end BUS of NMEA2000 to require energy receiving ± 36V voltage misconnection without impaired requirement, and will not generate
Parasitic radiation is to cause the EMC performance of maritime frequency bands not up to standard.
NMEA2000 bus 1 includes data signal bus end 11, the also known as end BUS, including bus differential data-signal anode
NET-H and bus differential data-signal negative terminal NET-L.The signal wire connecting end of CAN transceiver 3 includes 6 feet of CANL(U1),
7 feet of CANH(U1), the signal wire connecting end of CAN transceiver 3 is connect with the data signal bus end 11 of NMEA2000 bus 1.
NMEA2000 bus 1 further includes bus power source connecting pin 12, the end VCC (3 feet of U1) of CAN transceiver U1 and total
There is voltage conversion circuit 2 between line power connector end 12.Because the supply voltage of CAN transceiver U1 requires, generally cannot
More than 7V, and the supply voltage range of NMEA2000 bus 1 is generally 9V ~ 36V, and voltage conversion circuit 2 can be the electricity of bus
Source voltage step-down is to operating voltage appropriate, such as 5V.
Specifically, voltage conversion circuit 2 includes DC-DC converter U2, there is input terminal VIN, output end VOUT.
Further, the voltage conversion circuit 2 further includes filter capacitor.Filter capacitor includes the first filter capacitor
C1, the second filter capacitor C2.
Bus power source connecting pin 12 includes bus power source anode NET-S and bus power source negative terminal NET-C.First filter capacitor
C1 is connected between bus power source anode NET-S and bus power source negative terminal NET-C, and wherein one end of the first filter capacitor C1 is also
Connect DC-DC converter U2.
The input terminal VIN of DC-DC converter U2 is connect with bus power source connecting pin 12, the output end of DC-DC converter U2
VOUT is connect with the end VCC (3 feet of U1) of CAN transceiver U1.
The output voltage terminal (the 6th foot of Q1) of first photoelectrical coupler Q1 connects third power supply, in a specific embodiment
In, third power supply is 5V power supply.
The output voltage terminal (the 6th foot of Q2) of second photoelectrical coupler Q2 connects the 4th power supply, in a specific embodiment
In, the 4th power supply is 3V power supply.
As a preferred option, the voltage of second source can be by voltage conversion circuit 2, that is, DC-DC converter U2
Output end VOUT provide, the input of the second photoelectrical coupler Q2 positive (the 1st foot of Q2) by the second pull-up resistor R429 with
The output end of voltage conversion circuit 2 connects.
As a preferred option, the voltage of third power supply can also be provided by the output end VOUT of DC-DC converter U2, the
The output voltage terminal (the 6th foot of Q1) of one photoelectrical coupler Q1 is connect with the output end of voltage conversion circuit 2.
The utility model has the advantages that
1, the utility model uses the first optical coupling isolation circuit and the second optical coupling isolation circuit, meets DC and AC isolation and wants
It asks, and parasitic radiation will not be generated to cause the EMC performance of maritime frequency bands not up to standard.
2, further, the reachable ± 36V of error connection proof voltage.Can satisfy new standard requires the end BUS of NMEA2000 to want
Ask energy receiving ± 36V voltage misconnection without impaired requirement.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
All these improvement or transformation all should belong within the protection scope of the appended claims for the utility model.
Claims (10)
1. a kind of Bus isolation transmission circuit peculiar to vessel, including NMEA2000 bus, CAN transceiver and CAN controller；Its feature exists
In the CAN transceiver is connect with NMEA2000 bus；Also there is isolation electricity between the CAN transceiver and CAN controller
Road, the isolation circuit include the first optical coupling isolation circuit and the second optical coupling isolation circuit.
2. Bus isolation transmission circuit peculiar to vessel according to claim 1, which is characterized in that the CAN transceiver includes number
According to receiving end and data sending terminal, the CAN controller has receiving end and transmitting terminal；The first optical coupling isolation circuit connection
Between CAN transceiver data receiver and CAN controller receiving end；Second optical coupling isolation circuit is connected to CAN transmitting-receiving
Between device data sending terminal and CAN controller transmitting terminal.
3. Bus isolation transmission circuit peculiar to vessel according to claim 2, which is characterized in that first optical coupling isolation circuit
Including the first photoelectrical coupler, the input anode of first photoelectrical coupler is connected by the first pull-up resistor and the first power supply
It connects；The input cathode of first photoelectrical coupler is connect with CAN controller transmitting terminal；The current collection of first photoelectrical coupler
Pole is connect with CAN transceiver data transmitting terminal；The emitter of first photoelectrical coupler is grounded.
4. Bus isolation transmission circuit peculiar to vessel according to claim 2, which is characterized in that second optical coupling isolation circuit
Including the second photoelectrical coupler, the input anode of second photoelectrical coupler is connected by the second pull-up resistor and second source
It connects；The input cathode of second photoelectrical coupler is connect with CAN transceiver receiving end；The current collection of second photoelectrical coupler
Pole is connect with CAN controller receiving end；The emitter of second photoelectrical coupler is grounded.
5. Bus isolation transmission circuit peculiar to vessel according to claim 1, which is characterized in that the CAN transceiver is
SN65HVD251。
6. Bus isolation transmission circuit peculiar to vessel according to claim 1, which is characterized in that the CAN transceiver is
One of which in TLE6250, PCA82C251, SN65HVD233.
7. Bus isolation transmission circuit peculiar to vessel according to claim 1, which is characterized in that the NMEA2000 bus is also wrapped
Include bus power source connecting pin；There is voltage conversion circuit between the end the CAN transceiver VCC and bus power source connecting pin.
8. Bus isolation transmission circuit peculiar to vessel according to claim 7, which is characterized in that the voltage conversion circuit includes
DC-DC converter.
9. Bus isolation transmission circuit peculiar to vessel according to claim 7, which is characterized in that the first optical coupling isolation circuit it is defeated
Voltage end is connect with the output end of the voltage conversion circuit out；The input anode of first optical coupling isolation circuit passes through the second pull-up
Resistance is connect with the output end of the voltage conversion circuit.
10. Bus isolation transmission circuit peculiar to vessel according to claim 1, which is characterized in that the NMEA2000 bus packet
Include data signal bus end；The end BUS of CAN transceiver is connect with the data signal bus end of NMEA2000 bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821701629.9U CN208820779U (en) | 2018-10-19 | 2018-10-19 | A kind of Bus isolation transmission circuit peculiar to vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821701629.9U CN208820779U (en) | 2018-10-19 | 2018-10-19 | A kind of Bus isolation transmission circuit peculiar to vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208820779U true CN208820779U (en) | 2019-05-03 |
Family
ID=66279919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821701629.9U Active CN208820779U (en) | 2018-10-19 | 2018-10-19 | A kind of Bus isolation transmission circuit peculiar to vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208820779U (en) |
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2018
- 2018-10-19 CN CN201821701629.9U patent/CN208820779U/en active Active
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20210207 Address after: 518000 Room 401, No.2 factory building, hainengda technology factory, No.3, Baolong 4th Road, Baolong community, Baolong street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen fuchuang superior technology Co., Ltd Address before: 518116 No.1 plant (3rd and 6th floor), No.2 plant (4th and 5th floor) and No.3 plant of hainengda technology plant, No.3 Baolong 4th Road, Baolong street, Longgang District, Shenzhen City, Guangdong Province Patentee before: Norsat International Inc. |