CN207965557U - A kind of CAN interface circuit that interference rejection ability is strong - Google Patents
A kind of CAN interface circuit that interference rejection ability is strong Download PDFInfo
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- CN207965557U CN207965557U CN201820126919.9U CN201820126919U CN207965557U CN 207965557 U CN207965557 U CN 207965557U CN 201820126919 U CN201820126919 U CN 201820126919U CN 207965557 U CN207965557 U CN 207965557U
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Abstract
The utility model discloses a kind of CAN interface circuits that interference rejection ability is strong, including common mode inductance L1, resistance R4, capacitance C5, TVS pipe D1, resistance R3, capacitance C6, RC circuits, CAN chips U1, resistance R2, capacitance C3, resistance R1, the upper end of capacitance C1, 5 pins of the CAN chips U1 are separately connected the upper end of POW3 pins and capacitance C2, the left end of the capacitance C4, the upper end of capacitance C5, the lower end of capacitance C6, 3 pins of TVS pipe D1, 9 pins of CAN chips U1, 2 pins of CAN chips U1, the lower end of capacitance C3, the lower end of resistance R2, the lower end of capacitance C1 and the lower end of capacitance C2 are connect with DGND pins.The beneficial effects of the utility model：CAN interface circuit provided by the utility model has interference rejection ability strong, can effectively inhibit different types of electromagnetic interference by the device of different parameters, can improve the interference free performance of CAN communication, ensure the stability and reliability of circuit.
Description
Technical field
The utility model is related to interface circuit technical fields, it particularly relates to which a kind of CAN interface that interference rejection ability is strong is electric
Road.
Background technology
Battery management system is responsible for the energy stores transmission control of automobile as one of New-energy electric vehicle critical piece
System, affects the performance of electric vehicle, service life and safety.Especially battery management system controls the complicated of power battery and fills
Discharge process is responsible for the detection to the various abnormalities of power battery and reply processing, safe for guarantee power battery,
Effec-tive Function plays decisive role.
Battery management system is in the complex electromagnetic environment of electric vehicle, especially the high interferences such as driving motor, DCDC
Equipment battery management system can all be impacted, CAN communication module is responsible for the communication of battery management system, once CAN logical
Letter module receives extraneous interference, can seriously affect the function of battery management system, or even cause vehicle trouble.Therefore, it is promoted
The anti-interference ability of CAN communication module is also highly important.
Utility model content
For above-mentioned technical problem in the related technology, the utility model proposes a kind of CAN interface that interference rejection ability is strong electricity
Road can overcome the above-mentioned deficiency of the prior art.
To realize the above-mentioned technical purpose, the technical solution of the utility model is realized in：
A kind of CAN interface circuit that interference rejection ability is strong includes the 3 pins difference of common mode inductance L1, the common mode inductance L1
Connect 1 pin of the left end of resistance R4, the lower end of capacitance C5,1 pin of TVS pipe D1 and RC circuits, the 4 of the common mode inductance L1
Pin is separately connected 2 pins of the left end of resistance R3, the upper end of capacitance C6,2 pins of TVS pipe D1 and RC circuits, the RC electricity
3 pins on road connect INTCAN—4 pins of H pins, the RC circuits connect INTCAN—L pins, the 1 of the common mode inductance L1
Pin connects 13 pins of CAN chips U1,12 pins of the 2 pins connection CAN chips U1 of the common mode inductance L1, the CAN
11 pins of chip U1 are separately connected the left end of the right end of resistance R3, the right end of resistance R4 and capacitance C4, the CAN chips U1's
7 pins connect the upper end of resistance R2, and 10 pins of the CAN chips U1 are separately connected upper end and the POW4 pins of capacitance C3, institute
1 pin for stating CAN chips U1 is separately connected lower end and the TX pins of resistance R1, and the upper end of the resistance R1 connects POW1 pins,
4 pins of the CAN chips U1 connect RX pins, and 14 pins of the CAN chips U1 connect NSTB pins, the CAN chips
8 pins of U1 connect NERR pins, and 6 pins of the CAN chips U1 connect EN pins, the 3 pins difference of the CAN chips U1
Connect the upper end of POW2 pins and capacitance C1,5 pins of the CAN chips U1 are separately connected the upper of POW3 pins and capacitance C2
End, the left end of the capacitance C4, the upper end of capacitance C5, the lower end of capacitance C6,3 pins of TVS pipe D1, CAN chips U1 9 draw
Foot, 2 pins of CAN chips U1, the lower end of capacitance C3, the lower end of resistance R2, the lower end of capacitance C1 and capacitance C2 lower end with
DGND pins connect.
Further, the RC circuits include capacitance C7, the upper end of the capacitance C7 be separately connected resistance R5 left end and
The right end of 2 pins of TVS pipe D1, the resistance R5 connects INTCAN—The lower end of H pins, the capacitance C7 is separately connected resistance
The right end of the left end of R6 and 1 pin of TVS pipe D1, the resistance R6 connects INTCAN—L pins.
The beneficial effects of the utility model：CAN interface circuit provided by the utility model has interference rejection ability strong, passes through
The device of different parameters can effectively inhibit different types of electromagnetic interference, can improve the interference free performance of CAN communication, ensure electricity
The stability and reliability on road.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of circuit diagram of the strong CAN interface circuit of interference rejection ability according to the utility model embodiment.
Specific implementation mode
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, the every other embodiment that those of ordinary skill in the art are obtained all belongs to
In the range of the utility model protection.
As shown in Figure 1, the CAN interface circuit that a kind of interference rejection ability according to the utility model embodiment is strong, including
3 pins of common mode inductance L1, the common mode inductance L1 be separately connected the left end of resistance R4, the lower end of capacitance C5, TVS pipe D1 1
1 pin of pin and RC circuits, 4 pins of the common mode inductance L1 be separately connected the left end of resistance R3, capacitance C6 upper end,
3 pins of 2 pins of TVS pipe D1 and 2 pins of RC circuits, the RC circuits connect INTCAN—H pins, the 4 of the RC circuits
Pin connects INTCAN—L pins, 13 pins of the 1 pin connection CAN chips U1 of the common mode inductance L1, the common mode inductance
12 pins of the 2 pins connection CAN chips U1 of L1,11 pins of the CAN chips U1 are separately connected the right end of resistance R3, resistance
The left end of the right end and capacitance C4 of R4, the upper end of the 7 pins connection resistance R2 of the CAN chips U1, the 10 of the CAN chips U1
Pin is separately connected upper end and the POW4 pins of capacitance C3,1 pin of the CAN chips U1 be separately connected resistance R1 lower end and
The upper end of TX pins, the resistance R1 connects POW1 pins, and 4 pins of the CAN chips U1 connect RX pins, the CAN cores
14 pins of piece U1 connect NSTB pins, and 8 pins of the CAN chips U1 connect NERR pins, and the 6 of the CAN chips U1 draws
Foot connects EN pins, and 3 pins of the CAN chips U1 are separately connected the upper end of POW2 pins and capacitance C1, the CAN chips U1
5 pins be separately connected the upper end of POW3 pins and capacitance C2, the left end of the capacitance C4, the upper end of capacitance C5, capacitance C6
Under lower end, 3 pins of TVS pipe D1,9 pins of CAN chips U1,2 pins of CAN chips U1, the lower end of capacitance C3, resistance R2
The lower end at end, the lower end of capacitance C1 and capacitance C2 is connect with DGND pins.
In one embodiment, the RC circuits include capacitance C7, and the upper end of the capacitance C7 is separately connected resistance R5
Left end and TVS pipe D1 2 pins, the right end of the resistance R5 connects INTCAN—H pins, the lower end difference of the capacitance C7
1 pin of the left end and TVS pipe D1 of resistance R6 is connected, the right end of the resistance R6 connects INTCAN—L pins.
In order to facilitate the above-mentioned technical proposal of the utility model is understood, below by way of new to this practicality in specifically used mode
The above-mentioned technical proposal of type is described in detail.
When specifically used, the utility model includes common mode inductance, X capacitances, Y capacitance, TVS pipe D1（Transient voltage inhibits
Diode）With RC circuits；Wherein, Y capacitance includes capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and capacitance C6, Y electricity
Hold the common mode interference for mainly inhibiting interface circuit with common mode inductance L1, X capacitances C7 mainly inhibits the differential mode between CANH and CANL
Interference, while C7 forms RC circuits with R5, R6, is protected to TVS pipe D1, TVS pipe D1 can effectively inhibit interface circuit
Glitch.
The utility model also has transient state inhibition, em filtering and TVS defencive functions.
In conclusion CAN interface circuit provided by the utility model, has interference rejection ability strong, passes through the device of different parameters
Part can effectively inhibit different types of electromagnetic interference, can improve the interference free performance of CAN communication, ensure circuit stability and
Reliability.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection domain within.
Claims (2)
1. a kind of CAN interface circuit that interference rejection ability is strong, which is characterized in that including common mode inductance L1, the 3 of the common mode inductance L1
Pin is separately connected 1 pin of the left end of resistance R4, the lower end of capacitance C5,1 pin of TVS pipe D1 and RC circuits, the common mode
4 pins of inductance L1 are separately connected 2 pins of the left end of resistance R3, the upper end of capacitance C6,2 pins of TVS pipe D1 and RC circuits,
3 pins of the RC circuits connect INTCAN—4 pins of H pins, the RC circuits connect INTCAN—L pins, the common mode
13 pins of the 1 pin connection CAN chips U1 of inductance L1, the 12 of the 2 pins connection CAN chips U1 of the common mode inductance L1 draws
11 pins of foot, the CAN chips U1 are separately connected the left end of the right end of resistance R3, the right end of resistance R4 and capacitance C4, described
The upper end of the 7 pins connection resistance R2 of CAN chips U1,10 pins of the CAN chips U1 be separately connected capacitance C3 upper end and
1 pin of POW4 pins, the CAN chips U1 is separately connected lower end and the TX pins of resistance R1, and the upper end of the resistance R1 connects
POW1 pins are connect, 4 pins of the CAN chips U1 connect RX pins, and 14 pins of the CAN chips U1 connect NSTB pins,
8 pins of the CAN chips U1 connect NERR pins, and 6 pins of the CAN chips U1 connect EN pins, the CAN chips U1
3 pins be separately connected the upper end of POW2 pins and capacitance C1,5 pins of the CAN chips U1 be separately connected POW3 pins and
The upper end of capacitance C2, left end, the upper end of capacitance C5, the lower end of capacitance C6,3 pins of TVS pipe D1, the CAN cores of the capacitance C4
9 pins of piece U1,2 pins of CAN chips U1, the lower end of capacitance C3, the lower end of resistance R2, the lower end of capacitance C1 and capacitance C2
Lower end is connect with DGND pins.
2. a kind of strong CAN interface circuit of interference rejection ability according to claim 1, which is characterized in that the RC circuits packet
The upper end for including capacitance C7, the capacitance C7 is separately connected the left end of resistance R5 and 2 pins of TVS pipe D1, the right side of the resistance R5
End connection INTCAN—The lower end of H pins, the capacitance C7 is separately connected the left end of resistance R6 and 1 pin of TVS pipe D1, described
The right end of resistance R6 connects INTCAN—L pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820126919.9U CN207965557U (en) | 2018-01-25 | 2018-01-25 | A kind of CAN interface circuit that interference rejection ability is strong |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820126919.9U CN207965557U (en) | 2018-01-25 | 2018-01-25 | A kind of CAN interface circuit that interference rejection ability is strong |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207965557U true CN207965557U (en) | 2018-10-12 |
Family
ID=63734908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820126919.9U Expired - Fee Related CN207965557U (en) | 2018-01-25 | 2018-01-25 | A kind of CAN interface circuit that interference rejection ability is strong |
Country Status (1)
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| CN (1) | CN207965557U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308933A (en) * | 2020-02-25 | 2020-06-19 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
-
2018
- 2018-01-25 CN CN201820126919.9U patent/CN207965557U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308933A (en) * | 2020-02-25 | 2020-06-19 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
| CN111308933B (en) * | 2020-02-25 | 2021-11-05 | 广东省智能制造研究所 | Internet of things data acquisition system based on FPGA |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181012 Termination date: 20210125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |