CN207965560U - A kind of circuit detected automatically suitable for CAN bus terminal resistance - Google Patents
A kind of circuit detected automatically suitable for CAN bus terminal resistance Download PDFInfo
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- CN207965560U CN207965560U CN201820151694.2U CN201820151694U CN207965560U CN 207965560 U CN207965560 U CN 207965560U CN 201820151694 U CN201820151694 U CN 201820151694U CN 207965560 U CN207965560 U CN 207965560U
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- terminal resistance
- network node
- dpdt relay
- relay
- dpdt
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Abstract
The utility model discloses a kind of circuits detected automatically suitable for CAN bus terminal resistance, including CAN chips, dpdt relay and CAN network node, the control coil both ends of dpdt relay are connected respectively to one end of GND and signal relay, another termination GND of signal relay, first movable contact of dpdt relay is connected to the first end of terminal resistance, first normally opened contact of dpdt relay is connected to GAD, first normally-closed contact of dpdt relay is connected to CAN chips, second movable contact of dpdt relay is connected to the second end of terminal resistance, second normally opened contact of dpdt relay connects GND by AD signal acquisition modules, second normally-closed contact of dpdt relay is connected to CAN chips；The both ends of terminal resistance are connected respectively to the both ends of CAN network node.The beneficial effects of the utility model：CAN network terminal resistance detection time and detection difficulty are effectively reduced, the reliability of CAN network communication is effectively improved.
Description
Technical field
The utility model is related to CAN bus detection fields, relate in particular to one kind and being suitable for CAN bus terminal resistance certainly
The circuit of dynamic detection.
Background technology
In order to enhance the reliability of CAN bus communication, terminal coupling electricity will be usually added in two terminals of CAN bus network
Resistance.In practical application, CAN bus network often has whether multiple nodes, each node have terminal resistance, be related to CAN bus
Communication stability.
Habitually in the past we have confirmed that node whether has terminal resistance or whether CAN bus network terminal resistance is normal, usually adopt
With the method for manual measurement, the method has the following problems：（1）When node is excessive, it is long to expend the time；（2）If CAN bus is whole
When body harness, it is also necessary to plug connector or even broken loop wire beam measures；（3）It can not be to CAN network before each system operation
Terminal resistance is detected automatically, it is difficult to ensure the reliability of CAN network communication.
In view of the problems of the above-mentioned prior art, a kind of circuit detected automatically suitable for CAN bus terminal resistance is just
Seem there is an urgent need to.
Utility model content
For the problems in the relevant technologies, the utility model proposes one kind to detect automatically suitable for CAN bus terminal resistance
Circuit.
To realize the above-mentioned technical purpose, the technical solution of the utility model is realized in：
A kind of circuit detected automatically suitable for CAN bus terminal resistance, including CAN chips, dpdt relay and
CAN network node,
The control coil both ends of the dpdt relay are connected respectively to one end of GND and signal relay, described
Another termination GND of signal relay, the first movable contact of the dpdt relay are connected to the first end of terminal resistance,
First normally opened contact of the dpdt relay is connected to GAD, and the first normally-closed contact of the dpdt relay connects
CAN chips are connected to, the second movable contact of the dpdt relay is connected to the second end of terminal resistance, the double-pole double throw
Second normally opened contact of relay connects GND by AD signal acquisition modules, and the second of the dpdt relay is normally closed tactile
Point is connected to CAN chips；
The both ends of the terminal resistance are connected respectively to the both ends of CAN network node.
Further, the terminal resistance includes terminal resistance I and terminal resistance II, and the of the dpdt relay
One movable contact is connected to the first end of terminal resistance I, and the second movable contact of the dpdt relay is connected to terminal resistance I
Second end, the both ends of the terminal resistance I are parallel with terminal resistance II.
Further, the CAN network node includes CAN network node one, CAN network node two and CAN network node
N, the both ends of the terminal resistance I are connected respectively to the both ends of CAN network node one, and the two of the CAN network node one
End is connected respectively to the both ends of CAN network node two, and the both ends of the CAN network node two are connected respectively to CAN network node
n。
The beneficial effects of the utility model：Before CAN bus network is per task, CAN network terminal resistance detection is carried out, i.e.,
CAN network communication reliability can be effectively improved；CAN network terminal resistance detection time and detection difficulty can be effectively reduced, effectively
Improve the reliability of CAN network communication.
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 according to a kind of circuit detected automatically suitable for CAN bus terminal resistance described in the utility model embodiment
Structure diagram.
In figure：
1, dpdt relay；2, signal relay；3, AD signal acquisition modules；4, terminal resistance I；5, terminal resistance
Ⅱ；6, CAN chips；7, CAN network node one；8, CAN network node two；9, CAN network node n.
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, a kind of circuit detected automatically suitable for CAN bus terminal resistance, including CAN chips 6, double-pole are double
Relay 1 and CAN network node are thrown,
The control coil both ends of the dpdt relay 1 are connected respectively to one end of GND and signal relay 2, institute
Another termination GND of signal relay 2 is stated, the first movable contact of the dpdt relay 1 is connected to the of terminal resistance
First normally opened contact of one end, the dpdt relay 1 is connected to GAD, and the first of the dpdt relay 1 is normally closed
For contact portion to CAN chips 6, the second movable contact of the dpdt relay 1 is connected to the second end of terminal resistance, described
Second normally opened contact of dpdt relay 1 connects GND by AD signal acquisition modules 3, the dpdt relay 1
Second normally-closed contact is connected to CAN chips 6；
The both ends of the terminal resistance are connected respectively to the both ends of CAN network node.
The terminal resistance includes terminal resistance I 4 and terminal resistance II 5, and the first of the dpdt relay 1 is dynamic tactile
Point is connected to the first end of terminal resistance I 4, and the second movable contact of the dpdt relay 1 is connected to terminal resistance I 4
The both ends of second end, the terminal resistance I 4 are parallel with terminal resistance II 5.
The CAN network node includes CAN network node 1, CAN network node 28 and CAN network node n9, described
The both ends of terminal resistance I 4 are connected respectively to the both ends of CAN network node 1, the both ends point of the CAN network node 1
It is not connected to the both ends of CAN network node 28, the both ends of the CAN network node 28 are connected respectively to CAN network node n9.
Above-mentioned technical proposal is further understood for convenience, now its specifically used process is described in detail：
Dpdt relay 1 is controlled by microcontroller, under default conditions, CAN chips connect CAN bus, are positive normal open
Letter state, when needing to judge whether CAN network terminal resistance is correct, dpdt relay 1 acts, by CAN network terminal
Resistance is connected to pressure sampling circuit, and the default correct AD of microcontroller acquires signal, and terminal resistance is different, then can lead to AD
Acquire that signal is different, by actual acquisition to voltage compared with correct voltage, you can whether judge CAN network terminal resistance
Normally.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (3)
1. a kind of circuit detected automatically suitable for CAN bus terminal resistance, which is characterized in that including CAN chips（6）, double-pole
Double-throw relay（1）With CAN network node,
The dpdt relay（1）Control coil both ends be connected respectively to GND and signal relay（2）One end, institute
State signal relay（2）Another termination GND, the dpdt relay（1）The first movable contact be connected to terminal resistance
First end, the dpdt relay（1）The first normally opened contact be connected to GAD, the dpdt relay（1）'s
First normally-closed contact is connected to CAN chips（6）, the dpdt relay（1）The second movable contact be connected to terminal resistance
Second end, the dpdt relay（1）The second normally opened contact pass through AD signal acquisition modules（3）GND is connected, it is described
Dpdt relay（1）The second normally-closed contact be connected to CAN chips（6）；
The both ends of the terminal resistance are connected respectively to the both ends of CAN network node.
2. a kind of circuit detected automatically suitable for CAN bus terminal resistance according to claim 1, which is characterized in that
The terminal resistance includes terminal resistance I（4）With terminal resistance II（5）, the dpdt relay（1）The first movable contact
It is connected to terminal resistance I（4）First end, the dpdt relay（1）The second movable contact be connected to terminal resistance I
（4）Second end, the terminal resistance I（4）Both ends be parallel with terminal resistance II（5）.
3. a kind of circuit detected automatically suitable for CAN bus terminal resistance according to claim 2, which is characterized in that
The CAN network node includes CAN network node one（7）, CAN network node two（8）With CAN network node n（9）, the end
Hold resistance I（4）Both ends be connected respectively to CAN network node one（7）Both ends, the CAN network node one（7）Both ends point
It is not connected to CAN network node two（8）Both ends, the CAN network node two（8）Both ends be connected respectively to CAN network section
Point n（9）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820151694.2U CN207965560U (en) | 2018-01-30 | 2018-01-30 | A kind of circuit detected automatically suitable for CAN bus terminal resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820151694.2U CN207965560U (en) | 2018-01-30 | 2018-01-30 | A kind of circuit detected automatically suitable for CAN bus terminal resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207965560U true CN207965560U (en) | 2018-10-12 |
Family
ID=63735659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820151694.2U Expired - Fee Related CN207965560U (en) | 2018-01-30 | 2018-01-30 | A kind of circuit detected automatically suitable for CAN bus terminal resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207965560U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
-
2018
- 2018-01-30 CN CN201820151694.2U patent/CN207965560U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
| CN113176743B (en) * | 2021-03-25 | 2022-11-15 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181012 Termination date: 20210130 |