CN108944742A - A kind of new-energy automobile CAN bus signal resolution circuit - Google Patents
A kind of new-energy automobile CAN bus signal resolution circuit Download PDFInfo
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- CN108944742A CN108944742A CN201810879300.XA CN201810879300A CN108944742A CN 108944742 A CN108944742 A CN 108944742A CN 201810879300 A CN201810879300 A CN 201810879300A CN 108944742 A CN108944742 A CN 108944742A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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Abstract
The invention discloses a kind of new-energy automobile CAN bus signal resolution circuits, high level bus end including first transceiver module is connected with the high level bus end of the first bus, the low level bus end of first transceiver module is connected with the low level bus end of the first bus, the information transmitting terminal of first transceiver module is connected with the first information receiving end of controller, and the information receiving end of first transceiver module is connected with the first information transmitting terminal of controller；The high level bus end of second transceiver module is connected with the high level bus end of the second bus, the low level bus end of second transceiver module is connected with the low level bus end of the second bus, the information transmitting terminal of second transceiver module is connected with the second information receiving end of controller, and the information receiving end of second transceiver module is connected with the second information transmitting terminal of controller.The present invention can reduce external condition and impact to the interference of transceiver, be conducive to the normal transmitting of signal.
Description
Technical field
The present invention relates to a kind of vehicle CAN bus technical fields, more particularly to a kind of new-energy automobile CAN bus signal
Parser circuitry.
Background technique
CAN is the abbreviation (hereinafter referred to as CAN) of Controller Area Network, is the serial of ISO International standardization
Communication protocol.It is various for the requirement to safety, comfort, convenience, low nuisanceless, low cost in automobile industry
Electronic control system be developed.Due to communicating data type used between these systems and to the requirement of reliability
There are many case where being not quite similar, being made of multiple bus, and the quantity of harness is consequently increased." number of harness is reduced for adaptation
Amount ", the needs of " by multiple LAN, carrying out the high-speed communication of mass data ", electrical quotient Bosch of Germany in 1986 develops
CAN communication agreement towards automobile.Hereafter, CAN is standardized by ISO11898 and ISO11519, has been vapour in Europe
The standard agreement of vehicle network.The high-performance and reliability of CAN is accepted, and be widely used in industrial automation, ship,
Medical Devices, industrial equipment etc..Fieldbus is one of the hot spot of nowadays automatic field technology development, is known as automatic
The computer LAN in change field.Its appearance is that dcs realizes that real-time, reliable data are led between each node
Letter provides strong technical support.
Automobile is in thunderstorm weather or other environment downward drivings, when lightning stroke or other strong interference occurs, huge energy
If amount have little time to release, transceiver (transceiving chip) will be damaged, in order to prevent to the damage of transceiver, be now at present urgently
It solves the problems, such as.
Summary of the invention
The present invention is directed at least solve the technical problems existing in the prior art, a kind of new energy is especially innovatively proposed
Automobile CAN-bus signal resolution circuit.
In order to realize above-mentioned purpose of the invention, the present invention provides a kind of new-energy automobile CAN bus signal resolution electricity
Road, including first transceiver module, second transceiver module, the first power supply module and the second power supply module；
The high level bus end of first transceiver module is connected with the high level bus end of the first bus, first transceiver mould
The low level bus end of block is connected with the low level bus end of the first bus, the information transmitting terminal and control of first transceiver module
The first information receiving end of device is connected, the first information transmitting terminal phase of the information receiving end and controller of first transceiver module
Even；
The high level bus end of second transceiver module is connected with the high level bus end of the second bus, second transceiver mould
The low level bus end of block is connected with the low level bus end of the second bus, the information transmitting terminal and control of second transceiver module
Second information receiving end of device is connected, the second information transmitting terminal phase of the information receiving end and controller of second transceiver module
Even；
The power input of the power input of first power supply module and the second power supply module is connected with on-vehicle battery respectively,
The power output end of the power output end of first power supply module and the second power supply module is respectively first transceiver module, the second receipts
Send out device module and controller power supply.
In the preferred embodiment of the present invention, first transceiver module includes transceiving chip U2, transceiving chip U2
High level bus end CANH respectively with the first end of wire jumper JP1, the first end of capacitor C4, Transient Suppression Diode TVS4
One end is connected with the first end of thermistor PTC1, and the second end of wire jumper JP1 is connected with the first end of resistance R5, and the of resistance R5
Two ends respectively with the low level bus end CANL of transceiving chip U2, the first end of capacitor C5, Transient Suppression Diode TVS5
One end is connected with the first end of thermistor PTC2, and the second end of capacitor C4 inhibits two with the second end of capacitor C5, transient state respectively
The first end of pole pipe TVS3 is connected with power ground, the second end of Transient Suppression Diode TVS3 respectively with Transient Suppression Diode
The second end of TVS4 is connected with the second end of Transient Suppression Diode TVS5, the second end of thermistor PTC1 respectively with discharge tube
First end, the first end of discharge tube BC2 of BC1 is connected with the high level bus end of the first bus, and the second of thermistor PTC2
End is connected with the low level bus end of the second end of discharge tube BC1, the first end of discharge tube BC3 and the first bus respectively, discharges
The second end of pipe BC2 and the second end of discharge tube BC3 are connected with power ground respectively, the reference voltage output terminal of transceiving chip U2
Vref is connected with the first end of capacitor C3, the second end of capacitor C3 respectively with the ground terminal GND of transceiving chip U2, resistance R4
One end, capacitor C6 first end be connected with power ground, the second end of resistance R4 is connected with the selection end RS of transceiving chip U2, capacitor
The second end of C6 is connected with the power output end of the power end VCC of transceiving chip U2 and the first power supply module respectively, transceiving chip
The information receiving end RXD of U2 is connected with the first information transmitting terminal of controller, the information transmitting terminal TXD and resistance of transceiving chip U2
The first end of R7 is connected, and the second end of resistance R7 is connected with the first information receiving end of controller.When lightning stroke occurring or other are strong
When strong interference, if huge energy has little time to release, transceiver will be damaged, interferes the damage to transceiver in order to prevent,
Increase discharge tube (discharge tube BC1, discharge tube BC2 and discharge tube BC3), Transient Suppression Diode (Transient Suppression Diode
TVS3, Transient Suppression Diode TVS4 and Transient Suppression Diode TVS5) and thermistor (thermistor PTC1 and thermistor
PTC2) make bus protection.When being struck by lightning, the discharge tube being attempted by bus can release energy, under normal circumstances, put
The reaction speed of fulgurite is slow, clamp voltage height (about 800V), and Transient Suppression Diode can clamp down on the pressure difference of bus
Hereinafter, in this way when being interfered, Transient Suppression Diode can play a protective role 6.8V quickly；Thermistor can protect receipts
Device is sent out from the impact of overcurrent.The capacitor (capacitor C4 and capacitor C5) that one is respectively connect between CAN H and CAN L and ground, can
To play the role of filtering out the High-frequency Interference and anti-electromagnetic radiation in bus.
It in the preferred embodiment of the present invention, further include isolating chip U3 and isolating chip U4, isolating chip U3
Power input VDD respectively with the enable end EN of isolating chip U3, the first end of capacitor C7, the first end of resistance R6, be isolated
The power input VDD of chip U4, the enable end EN of isolating chip U4, the first end of capacitor C8, the first end of resistance R8 and
The power output ends of two power supply modules is connected, the second end of capacitor C7 respectively with the ground terminal GND and power ground of isolating chip U3
It is connected, the signal output end Vo of isolating chip U3 is connected with the information receiving end RXD of the second end of resistance R6 and transceiving chip U2,
The second end of capacitor C8 is connected with the ground terminal GND and power ground of isolating chip U4 respectively, the signal output end of isolating chip U4
Vo is connected with the first information receiving end of the second end of resistance R8 and controller, the cathode Vin of isolating chip U3 and controller
First information transmitting terminal is connected, and the cathode Vin of isolating chip U4 is connected with the second end of resistance R7, the anode of isolating chip U3
The anode VCC of VCC and isolating chip U4 is connected with the power output end of the first power supply module respectively.By CAN controller with
Increase isolating chip between transceiver, be conducive to carry out Phototube Coupling, prevents various interfere from entering system along communication cable, thus
The normal work of guarantee system protects CAN controller.
In the preferred embodiment of the present invention, second transceiver module includes transceiving chip U1, transceiving chip U1
High level bus end CANH be connected with the first end of common mode inductance L3, the second end of common mode inductance L3 is respectively with diode D1's
Positive, diode D2 cathode is connected with the first end of resistance R1, low level bus end CANL and the common mode electricity of transceiving chip U1
The third end for feeling L3 is connected, the 4th end of the common mode inductance L3 cathode and resistance with the anode of diode D3, diode D4 respectively
The first end of R2 is connected, and the cathode of diode D1 and the cathode of diode D3 inhibit two with the cathode of diode D5 and transient state respectively
The first end of pole pipe TVS2 is connected, the anode of diode D2 and diode D4 it is positive respectively with the anode and transient state of diode D6
Inhibit the second end of diode TVS2 to be connected, the second end of resistance R1 respectively with the first end of discharge tube GDT and the second bus
High level bus end is connected, the second end of the resistance R2 low level bus with the second end of discharge tube GDT and the second bus respectively
End is connected, and the third end of discharge tube GDT is connected with the first end of the earth, the first end of capacitor C2 and resistance R3 respectively, diode
The cathode of the anode of D5 and diode D6 respectively with the isolation end CANG of transceiving chip U1, the second end of capacitor C2, resistance R3
Second end is connected with power ground, and the power input VCC of transceiving chip U1 inhibits two poles with the first end of capacitor C1, transient state respectively
The first end of pipe TVS1 is connected with the power output end of the power output end of the first power supply module or the second power supply module, capacitor C1
Second end and the second end of Transient Suppression Diode TVS1 be connected respectively with the ground terminal GND of power ground and transceiving chip U1,
The signal sending end RXD of transceiving chip U1 is connected with the second information receiving end of controller, the signal receiving end of transceiving chip U1
TXD is connected with the second information transmitting terminal of controller.When lightning stroke, surge generate, it is placed in the discharge tube GDT of interface front end
Moment reaches low resistive state, provided for transient high-current release it is logical, by voltage clamp between CAN_H, CAN_L in twenties volts of ranges
It is interior, the lightning surge protection of the first order is provided；The Transient Suppression Diode TVS2 of rear end provides second level carrying out surge protection, protects mould
Block is not damaged and the reliable communication of bus.
In the preferred embodiment of the present invention, the first power supply module includes field-effect tube Q1, field-effect tube Q1's
Source electrode is connected with the first end of the cathode of diode D7 and inductance L1 respectively, the second end of inductance L1 respectively with capacitor C9 first
End be connected with the first end of resistance R9, the grid of field-effect tube Q1 is connected with the end PWM of controller, the drain electrode of field-effect tube Q1 and
The anode of on-vehicle battery is connected, the cathode of on-vehicle battery respectively with power ground, the anode of diode D7, capacitor C9 second end and
The second end of resistance R9 is connected.Controller is to the square wave that the grid of field-effect tube sends 13KZ, voltage is 0.7V, by on-vehicle battery
+ 12V is converted into+5V, and circuit is simply easily achieved.
In the preferred embodiment of the present invention, the second power supply module includes power supply chip U5, power supply chip U5's
Power input+Vin is connected with the anode and the first end of capacitor C10 of on-vehicle battery respectively, the second end of capacitor C10 respectively with
The ground terminal GND of power supply chip U5, the control signal ON/OFF of power supply chip U5 are connected with power ground, and power supply chip U5's is anti-
Feedback input terminal FEEDBACK is connected with the first end of the first end of inductance L2 and capacitor C11 respectively, the second end difference of inductance L2
It is connected with the first end of the voltage output end OUTPUT of power supply chip U5 and Transient Suppression Diode TVS6, Transient Suppression Diode
The second end of TVS6 and the second end of capacitor C11 are connected with power ground respectively.+ 5V is converted by on-vehicle battery+12V, power supply is defeated
Stablize out.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are: the present invention passes through the first transmitting-receiving
Device module and second transceiver module reduce external condition and impact to the interference of transceiver, are conducive to the normal transmitting of signal, and
And first power supply module and the second power supply module for first transceiver module and second transceiver module to provide stable power supply defeated
Enter.
Detailed description of the invention
Fig. 1 is the circuit connection diagram of new-energy automobile CAN bus signal resolution circuit of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
The present invention provides a kind of new-energy automobile CAN bus signal resolution circuits, as shown in Figure 1, including the first transmitting-receiving
Device module, second transceiver module, the first power supply module and the second power supply module.
The high level bus end of first transceiver module is connected with the high level bus end of the first bus, first transceiver mould
The low level bus end of block is connected with the low level bus end of the first bus, the information transmitting terminal and control of first transceiver module
The first information receiving end of device is connected, the first information transmitting terminal phase of the information receiving end and controller of first transceiver module
Even.In the present embodiment, controller is CAN controller, it is preferred to use TC1728.
The high level bus end of second transceiver module is connected with the high level bus end of the second bus, second transceiver mould
The low level bus end of block is connected with the low level bus end of the second bus, the information transmitting terminal and control of second transceiver module
Second information receiving end of device is connected, the second information transmitting terminal phase of the information receiving end and controller of second transceiver module
Even.
The power input of the power input of first power supply module and the second power supply module is connected with on-vehicle battery respectively,
The power output end of the power output end of first power supply module and the second power supply module is respectively first transceiver module, the second receipts
Send out device module and controller power supply.
In the preferred embodiment of the present invention, first transceiver module includes transceiving chip U2, transceiving chip U2
High level bus end CANH respectively with the first end of wire jumper JP1, the first end of capacitor C4, Transient Suppression Diode TVS4
One end is connected with the first end of thermistor PTC1, and the second end of wire jumper JP1 is connected with the first end of resistance R5, and the of resistance R5
Two ends respectively with the low level bus end CANL of transceiving chip U2, the first end of capacitor C5, Transient Suppression Diode TVS5
One end is connected with the first end of thermistor PTC2, and the second end of capacitor C4 inhibits two with the second end of capacitor C5, transient state respectively
The first end of pole pipe TVS3 is connected with power ground, the second end of Transient Suppression Diode TVS3 respectively with Transient Suppression Diode
The second end of TVS4 is connected with the second end of Transient Suppression Diode TVS5, the second end of thermistor PTC1 respectively with discharge tube
First end, the first end of discharge tube BC2 of BC1 is connected with the high level bus end of the first bus, and the second of thermistor PTC2
End is connected with the low level bus end of the second end of discharge tube BC1, the first end of discharge tube BC3 and the first bus respectively, discharges
The second end of pipe BC2 and the second end of discharge tube BC3 are connected with power ground respectively, the reference voltage output terminal of transceiving chip U2
Vref is connected with the first end of capacitor C3, the second end of capacitor C3 respectively with the ground terminal GND of transceiving chip U2, resistance R4
One end, capacitor C6 first end be connected with power ground, the second end of resistance R4 is connected with the selection end RS of transceiving chip U2, capacitor
The second end of C6 is connected with the power output end of the power end VCC of transceiving chip U2 and the first power supply module respectively, transceiving chip
The information receiving end RXD of U2 is connected with the first information transmitting terminal of controller, the information transmitting terminal TXD and resistance of transceiving chip U2
The first end of R7 is connected, and the second end of resistance R7 is connected with the first information receiving end of controller.In the present embodiment, capacitor
The capacitance of C3, capacitor C4 and capacitor C5 are 30pF, and the capacitance of capacitor C6 is 0.1uF, and the resistance value of resistance R4 is that 47K is, resistance R5
Resistance value be 120 be that it is the type of discharge tube BC1, discharge tube BC2 and discharge tube BC3 that the resistance value of resistance R6 and resistance R7, which are 390,
Number be TED485, the model of Transient Suppression Diode TVS3, Transient Suppression Diode TVS4 and Transient Suppression Diode TVS5
The model MF11-10K of c12ci/12V, thermistor PTC1 and thermistor PTC2, the model of transceiving chip U2
The CAN transceiver chip of TJA1050T or other homologous series, the terminal resistance in the first bus are 120 total.Wherein, the first transmitting-receiving
Device module can with second transceiver module exchange or it is identical.
It in the preferred embodiment of the present invention, further include isolating chip U3 and isolating chip U4, isolating chip U3
Power input VDD respectively with the enable end EN of isolating chip U3, the first end of capacitor C7, the first end of resistance R6, be isolated
The power input VDD of chip U4, the enable end EN of isolating chip U4, the first end of capacitor C8, the first end of resistance R8 and
The power output ends of two power supply modules is connected, the second end of capacitor C7 respectively with the ground terminal GND and power ground of isolating chip U3
It is connected, the signal output end Vo of isolating chip U3 is connected with the information receiving end RXD of the second end of resistance R6 and transceiving chip U2,
The second end of capacitor C8 is connected with the ground terminal GND and power ground of isolating chip U4 respectively, the signal output end of isolating chip U4
Vo is connected with the first information receiving end of the second end of resistance R8 and controller, the cathode Vin of isolating chip U3 and controller
First information transmitting terminal is connected, and the cathode Vin of isolating chip U4 is connected with the second end of resistance R7, the anode of isolating chip U3
The anode VCC of VCC and isolating chip U4 is connected with the power output end of the first power supply module respectively.In the present embodiment, electric
It is the light of 6N137 or other series that the capacitance for holding C7 and capacitor C8, which is the model of 0.1uF, isolating chip U3 and isolating chip U4,
Electric isolator.
In the preferred embodiment of the present invention, second transceiver module includes transceiving chip U1, transceiving chip U1
High level bus end CANH be connected with the first end of common mode inductance L3, the second end of common mode inductance L3 is respectively with diode D1's
Positive, diode D2 cathode is connected with the first end of resistance R1, low level bus end CANL and the common mode electricity of transceiving chip U1
The third end for feeling L3 is connected, the 4th end of the common mode inductance L3 cathode and resistance with the anode of diode D3, diode D4 respectively
The first end of R2 is connected, and the cathode of diode D1 and the cathode of diode D3 inhibit two with the cathode of diode D5 and transient state respectively
The first end of pole pipe TVS2 is connected, the anode of diode D2 and diode D4 it is positive respectively with the anode and transient state of diode D6
Inhibit the second end of diode TVS2 to be connected, the second end of resistance R1 respectively with the first end of discharge tube GDT and the second bus
High level bus end is connected, the second end of the resistance R2 low level bus with the second end of discharge tube GDT and the second bus respectively
End is connected, and the third end of discharge tube GDT is connected with the first end of the earth, the first end of capacitor C2 and resistance R3 respectively, diode
The cathode of the anode of D5 and diode D6 respectively with the isolation end CANG of transceiving chip U1, the second end of capacitor C2, resistance R3
Second end is connected with power ground, and the power input VCC of transceiving chip U1 inhibits two poles with the first end of capacitor C1, transient state respectively
The first end of pipe TVS1 is connected with the power output end of the power output end of the first power supply module or the second power supply module, capacitor C1
Second end and the second end of Transient Suppression Diode TVS1 be connected respectively with the ground terminal GND of power ground and transceiving chip U1,
The signal sending end RXD of transceiving chip U1 is connected with the second information receiving end of controller, the signal receiving end of transceiving chip U1
TXD is connected with the second information transmitting terminal of controller.In the present embodiment, Transient Suppression Diode TVS1 and transient state inhibit two
The model 1N5647A of pole pipe TVS2, diode D1, diode D2, diode D3, diode D4, diode D5 and diode
D6 is Schottky diode, and it is the model P1300LC of discharge tube GDT, capacitor C2 that the resistance value of resistance R1 and resistance R2, which are 100,
Capacitance be 0.1uF, the resistance value of resistance R3 is that 12K is, the inductance value of common mode inductance L3 is 200uH, and the capacitance of capacitor C1 is
The model CTM1051M of 4.7uF, transceiving chip U1, the terminal resistance in the first bus are 120 lines.
In the preferred embodiment of the present invention, the first power supply module includes field-effect tube Q1, field-effect tube Q1's
Source electrode is connected with the first end of the cathode of diode D7 and inductance L1 respectively, the second end of inductance L1 respectively with capacitor C9 first
End be connected with the first end of resistance R9, the grid of field-effect tube Q1 is connected with the end PWM of controller, the drain electrode of field-effect tube Q1 and
The anode of on-vehicle battery is connected, the cathode of on-vehicle battery respectively with power ground, the anode of diode D7, capacitor C9 second end and
The second end of resistance R9 is connected.In the present embodiment, the model 2N6659 of field-effect tube Q1, field-effect tube Q1 are received
Pwm signal is 10~15Kz, and the voltage of 0.5~0.8V, the model ZHCS750 of diode D7, the inductance value of inductance L1 is
The capacitance of 160uH, capacitor C9 are 1mF, and the resistance value of resistance R9 is that 15K is, the voltage of on-vehicle battery is+12V.Wherein, it first supplies
Electric module can with the second power supply module exchange or it is identical.
In the preferred embodiment of the present invention, the second power supply module includes power supply chip U5, power supply chip U5's
Power input+Vin is connected with the anode and the first end of capacitor C10 of on-vehicle battery respectively, the second end of capacitor C10 respectively with
The ground terminal GND of power supply chip U5, the control signal ON/OFF of power supply chip U5 are connected with power ground, and power supply chip U5's is anti-
Feedback input terminal FEEDBACK is connected with the first end of the first end of inductance L2 and capacitor C11 respectively, the second end difference of inductance L2
It is connected with the first end of the voltage output end OUTPUT of power supply chip U5 and Transient Suppression Diode TVS6, Transient Suppression Diode
The second end of TVS6 and the second end of capacitor C11 are connected with power ground respectively.In the present embodiment, the capacitance of capacitor C10 is
The capacitance of 100uF, capacitor C11 are 330uF, and the inductance value of inductance L2 is 330uH, the model of Transient Suppression Diode TVS6
The model LM2575 of 1N5819, power supply chip U5.
The invention also discloses a kind of vehicle CAN bus signal resolution system, including engine management system (i.e. EMS),
Vehicle management system and new-energy automobile CAN bus signal resolution circuit, the vehicle management system includes electric power steering
One of system (i.e. EPS), automatic gear-box management system (i.e. TCU) and electronic brake system (i.e. EPB) or any combination,
It can also include DS (i.e. dissemination system) and BSI (i.e. electronic control unit)；The high level bus end of engine management system with
The high level bus end of first bus is connected, the low level bus end of engine management system and the low level bus of the first bus
End be connected, the high level bus end of dissemination system, the high level bus end of electronic control unit, electric boosting steering system height
The high level bus end of level bus end, the high level bus end of automatic gear-box management system and electronic brake system point
It is not connected with the high level bus end of the second bus, the low level bus end of engine management system and the low level of the first bus
Bus end is connected, low level bus end, the electric boosting steering system of the low level bus end of dissemination system, electronic control unit
Low level bus end, the low level bus end of automatic gear-box management system and the low level bus of electronic brake system
End is connected with the low level bus end of the second bus respectively.Each system unit is led to by the first bus and the second bus
Letter connection.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (6)
1. a kind of new-energy automobile CAN bus signal resolution circuit, which is characterized in that received including first transceiver module, second
Send out device module, the first power supply module and the second power supply module；
The high level bus end of first transceiver module is connected with the high level bus end of the first bus, first transceiver module
Low level bus end is connected with the low level bus end of the first bus, the information transmitting terminal of first transceiver module and controller
First information receiving end is connected, and the information receiving end of first transceiver module is connected with the first information transmitting terminal of controller；
The high level bus end of second transceiver module is connected with the high level bus end of the second bus, second transceiver module
Low level bus end is connected with the low level bus end of the second bus, the information transmitting terminal of second transceiver module and controller
Second information receiving end is connected, and the information receiving end of second transceiver module is connected with the second information transmitting terminal of controller；
The power input of the power input of first power supply module and the second power supply module is connected with on-vehicle battery respectively, and first
The power output end of the power output end of power supply module and the second power supply module is respectively first transceiver module, second transceiver
Module and controller power supply.
2. new-energy automobile CAN bus signal resolution circuit according to claim 1, which is characterized in that first transceiver
Module includes transceiving chip U2, the high level bus end CANH of transceiving chip U2 respectively with the first end of wire jumper JP1, capacitor C4
First end, the first end of Transient Suppression Diode TVS4 are connected with the first end of thermistor PTC1, the second end of wire jumper JP1 with
The first end of resistance R5 is connected, the second end of resistance R5 respectively with the low level bus end CANL of transceiving chip U2, capacitor C5
First end, the first end of Transient Suppression Diode TVS5 are connected with the first end of thermistor PTC2, the second end point of capacitor C4
It is not connected with the second end of capacitor C5, the first end of Transient Suppression Diode TVS3 and power ground, Transient Suppression Diode TVS3
Second end be connected respectively with the second end of the second end of Transient Suppression Diode TVS4 and Transient Suppression Diode TVS5, temperature-sensitive
The second end of resistance PTC1 is total with the high level of the first end of discharge tube BC1, the first end of discharge tube BC2 and the first bus respectively
Line end be connected, the second end of thermistor PTC2 respectively with the second end of discharge tube BC1, the first end of discharge tube BC3 and first
The low level bus end of bus is connected, and the second end of discharge tube BC2 and the second end of discharge tube BC3 are connected with power ground respectively,
The reference voltage output terminal Vref of transceiving chip U2 is connected with the first end of capacitor C3, the second end of capacitor C3 respectively with transmitting-receiving core
The ground terminal GND of piece U2, the first end of resistance R4, the first end of capacitor C6 are connected with power ground, the second end and receipts of resistance R4
Send out chip U2 selection end RS be connected, the second end of capacitor C6 respectively with the power end VCC of transceiving chip U2 and first power supply mould
The power output end of block is connected, and the information receiving end RXD of transceiving chip U2 is connected with the first information transmitting terminal of controller, transmitting-receiving
The information transmitting terminal TXD of chip U2 is connected with the first end of resistance R7, and the second end of resistance R7 and the first information of controller connect
Receiving end is connected.
3. new-energy automobile CAN bus signal resolution circuit according to claim 2, which is characterized in that further include isolation
The power input VDD of chip U3 and isolating chip U4, isolating chip U3 respectively with the enable end EN of isolating chip U3, capacitor C7
First end, the first end of resistance R6, the power input VDD of isolating chip U4, the enable end EN of isolating chip U4, capacitor C8
First end, the first end of resistance R8 be connected with the power output end of the second power supply module, the second end of capacitor C7 respectively with every
The ground terminal GND of off-chip piece U3 is connected with power ground, the second end and receipts of the signal output end Vo and resistance R6 of isolating chip U3
Send out chip U2 information receiving end RXD be connected, the second end of capacitor C8 respectively with the ground terminal GND and power ground of isolating chip U4
It is connected, the signal output end Vo of isolating chip U4 is connected with the first information receiving end of the second end of resistance R8 and controller, every
The cathode Vin of off-chip piece U3 is connected with the first information transmitting terminal of controller, and the of the cathode Vin and resistance R7 of isolating chip U4
Two ends are connected, and the anode VCC of the anode VCC and isolating chip U4 of isolating chip U3 are exported with the power supply of the first power supply module respectively
End is connected.
4. new-energy automobile CAN bus signal resolution circuit according to claim 1, which is characterized in that second transceiver
Module includes transceiving chip U1, and the high level bus end CANH of transceiving chip U1 is connected with the first end of common mode inductance L3, common mode
The second end of inductance L3 is connected with the first end of the anode of diode D1, the cathode of diode D2 and resistance R1 respectively, receives and dispatches core
The third end of the low level bus end CANL and common mode inductance L3 of piece U1 are connected, the 4th end of common mode inductance L3 respectively with diode
The anode of D3, the cathode of diode D4 are connected with the first end of resistance R2, the cathode of diode D1 and the cathode point of diode D3
It is not connected with the first end of the cathode of diode D5 and Transient Suppression Diode TVS2, the anode of diode D2 is with diode D4's
Anode is connected with the anode and the second end of Transient Suppression Diode TVS2 of diode D6 respectively, the second end of resistance R1 respectively with
The first end of discharge tube GDT is connected with the high level bus end of the second bus, and the second end of resistance R2 is respectively with discharge tube GDT's
Second end is connected with the low level bus end of the second bus, the third end of discharge tube GDT respectively with the earth, capacitor C2 first end
It is connected with the first end of resistance R3, the anode of diode D5 and the cathode isolation end with transceiving chip U1 respectively of diode D6
CANG, the second end of capacitor C2, the second end of resistance R3 are connected with power ground, the power input VCC difference of transceiving chip U1
It is supplied with the first end of capacitor C1, the power output end of the first end of Transient Suppression Diode TVS1 and the first power supply module or second
The power output end of electric module is connected, the second end of the second end of capacitor C1 and Transient Suppression Diode TVS1 respectively with power ground
It is connected with the ground terminal GND of transceiving chip U1, the signal sending end RXD of transceiving chip U1 and the second information receiving end of controller
It is connected, the signal receiving end TXD of transceiving chip U1 is connected with the second information transmitting terminal of controller.
5. new-energy automobile CAN bus signal resolution circuit according to claim 1, which is characterized in that the first power supply mould
Block includes field-effect tube Q1, and the source electrode of field-effect tube Q1 is connected with the first end of the cathode of diode D7 and inductance L1 respectively, electricity
The second end of sense L1 is connected with the first end of the first end of capacitor C9 and resistance R9 respectively, the grid and controller of field-effect tube Q1
The end PWM be connected, the drain electrode of field-effect tube Q1 is connected with the anode of on-vehicle battery, the cathode of on-vehicle battery respectively with power ground,
The anode of diode D7, the second end of capacitor C9 are connected with the second end of resistance R9.
6. new-energy automobile CAN bus signal resolution circuit according to claim 1, which is characterized in that the second power supply mould
Block includes power supply chip U5, the power input+Vin of power supply chip U5 respectively with the anode of on-vehicle battery and capacitor C10 the
One end is connected, the second end of the capacitor C10 control signal ON/ with the ground terminal GND of power supply chip U5, power supply chip U5 respectively
OFF is connected with power ground, the feedback input end FEEDBACK of power supply chip U5 respectively with the first end of inductance L2 and capacitor C11
First end be connected, the second end of inductance L2 respectively with the voltage output end OUTPUT and Transient Suppression Diode of power supply chip U5
The first end of TVS6 is connected, and the second end of Transient Suppression Diode TVS6 and the second end of capacitor C11 are connected with power ground respectively.
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Cited By (1)
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| CN108995612A (en) * | 2018-08-03 | 2018-12-14 | 中国汽车工程研究院股份有限公司 | A kind of new-energy automobile CAN bus signal resolution circuit, system and method |
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| CN108944742B (en) | 2023-07-21 |
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