CN206804769U - A kind of CAN signal line shorted to earth test device - Google Patents
A kind of CAN signal line shorted to earth test device Download PDFInfo
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- CN206804769U CN206804769U CN201720067211.6U CN201720067211U CN206804769U CN 206804769 U CN206804769 U CN 206804769U CN 201720067211 U CN201720067211 U CN 201720067211U CN 206804769 U CN206804769 U CN 206804769U
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Abstract
The utility model embodiment is related to field of circuit technology, discloses a kind of CAN signal line shorted to earth test device, and the test device includes ON-OFF control circuit and warning circuit, wherein：The input connection controller local area network CAN signal line of the ON-OFF control circuit, the output end of the ON-OFF control circuit connect the warning circuit；When the CAN signal line shorted to earth, the CAN signal line to the ON-OFF control circuit input signal to control the disconnection of the ON-OFF control circuit, according to the disconnection of the ON-OFF control circuit alarmed by the warning circuit.It can be seen that implement the utility model embodiment can improve detection CAN signal line whether the efficiency of shorted to earth.
Description
Technical field
It the utility model is related to field of circuit technology, more particularly to a kind of CAN signal line shorted to earth test device.
Background technology
Controller local area network (Controller Area Network, CAN) bussing technique is that automobile industry is most common
The communication bus technology of Vehicle Electronic Control module.CAN is by controller corresponding to each electronic control function module of automobile
Connected with CAN controller to strengthen communication efficiency.In CAN technology, CAN signal line can be divided into high signal
Line CAN_H lines and low level signal line CAN_L lines, controller corresponding to each electronic control function module can be by its working conditions
Data are swapped by CAN signal line.CAN_H lines and CAN_L lines are respectively transmitted a pair of differential signals, the data letter of transmission
Number the mathematic interpolation drawn after CAN_L signals is subtracted with CAN_H, and be ultimately converted to data signal.In actual applications, permitted
The signal ground of multi-controller equipotential link, if CAN_H lines or CAN_L lines and signal with the metal shell of controller
After ground short circuit, differential signal physics waveform will produce distortion, influence data transfer and decoding quality.
In product design or Qualify Phase, the device measuring CAN_H lines of usually used oscillograph or more professional
With the physics waveform quality of signal on CAN_L lines, or the impedance of CAN lines over the ground is measured to detect CAN letters with universal meter manually
Number line whether the judgement of shorted to earth.But found in practice, by using the device measuring CAN_H lines such as oscillograph and CAN_L
The physics waveform quality of signal or measure the mode such as CAN line earth impedance on line with universal meter manually and be to detect CAN signal line
No shorted to earth it is less efficient.
The content of the invention
A kind of CAN signal line shorted to earth test device disclosed in the utility model embodiment, it is possible to increase detection CAN letters
Number line whether the efficiency of shorted to earth.
The utility model embodiment first aspect discloses a kind of CAN signal line shorted to earth test device, the test
Device includes ON-OFF control circuit and warning circuit, wherein：
The input connection controller local area network CAN signal line of the ON-OFF control circuit, the ON-OFF control circuit
Output end connect the warning circuit；
The CAN signal line to the ON-OFF control circuit input signal to control the disconnection of the ON-OFF control circuit,
The warning circuit is alarmed according to the disconnection of the ON-OFF control circuit.
The utility model embodiment second aspect discloses a kind of automobile controller, and the automobile controller includes first party
Test device described in face.
The input of ON-OFF control circuit in the CAN signal line shorted to earth test device that the utility model embodiment provides
Connect CAN signal line, the output end connection warning circuit of the ON-OFF control circuit；The CAN signal line is to the ON-OFF control circuit
Input signal to control the disconnection of the ON-OFF control circuit, according to the disconnection of the ON-OFF control circuit reported by the warning circuit
It is alert.
It can be seen that implementing the utility model embodiment, when CAN signal line shorted to earth, CAN signal line controls to the switch
The signal of circuit input controls the ON-OFF control circuit to disconnect, so as to cause the warning circuit being connected with the ON-OFF control circuit to enter
Row alarm, instead of the parameters such as waveform or the impedance for detecting CAN signal wires manually by instruments such as oscillograph or universal meters to sentence
The fixed CAN signal line whether the detection method of shorted to earth, improve detection CAN signal line whether the efficiency of shorted to earth.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation for CAN signal line shorted to earth test device that the utility model embodiment provides；
Fig. 2 is the structural representation for another CAN signal line shorted to earth test device that the utility model embodiment provides
Figure；
Fig. 3 is a kind of structural representation for first switch control unit that the utility model embodiment provides；
Fig. 4 is a kind of structural representation for second switch control unit that the utility model embodiment provides；
Fig. 5 is the structural representation for another CAN signal line shorted to earth test device that the utility model embodiment provides
Figure；
Fig. 5 (a) is a kind of differential signal schematic diagram that the utility model embodiment provides；
Fig. 6 is the structural representation for another CAN signal line shorted to earth test device that the utility model embodiment provides
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1 is referred to, Fig. 1 is a kind of CAN signal line shorted to earth test device that the utility model embodiment provides
Structural representation, the test device include ON-OFF control circuit and warning circuit, wherein, the input of the ON-OFF control circuit connects
Controller local area network's CAN signal line is connect, the output end of the ON-OFF control circuit connects the warning circuit, when the CAN signal line
During shorted to earth, the CAN signal line to the ON-OFF control circuit input signal to control the disconnection of the ON-OFF control circuit, the report
Alert circuit is alarmed according to the disconnection of the ON-OFF control circuit.
Referring to the structural representation of Fig. 2 another CAN signal line shorted to earth test devices provided, the CAN signal line
Including high signal line CAN_H lines and low level signal line CAN_L lines, the ON-OFF control circuit include first switch control unit and
Second switch control unit, the warning circuit include the first alarm unit and the second alarm unit, wherein, first switch control
The input of unit connects the CAN_H lines, and the output end of the first switch control unit connects first alarm unit, when this
During CAN_H line shorted to earths, the CAN_H lines to the first switch control unit input signal with control the first switch control
The disconnection of unit, first alarm unit are alarmed according to the disconnection of the first switch control unit；The second switch controls
The input of unit connects the CAN_L lines, and the output end of the second switch control unit connects second alarm unit, when this
During CAN_L line shorted to earths, the CAN_L lines are single to control the second switch to control to the second switch control unit input signal
The disconnection of member, second alarm unit are alarmed according to the disconnection of the second switch control unit.
Optionally, the ON-OFF control circuit can also only include first switch control unit, and the warning circuit can be wrapped only
The first alarm unit is included, wherein the CAN_H lines, the first switch control unit and first alarm unit may be referred to Fig. 1 institutes
The corresponding connected mode shown, the i.e. embodiment may be used just to detect CAN_H lines whether shorted to earth, when the CAN_H lines over the ground
When short-circuit, the CAN_H lines, to control the disconnection of the first switch control unit, are somebody's turn to do to the first switch control unit input signal
First alarm unit is alarmed according to the disconnection of the first switch control unit；Or, the ON-OFF control circuit can also be wrapped only
Second switch control unit is included, the warning circuit can only include the second alarm unit, wherein the CAN_L lines, the second switch
Control unit and second alarm unit may be referred to the corresponding connected mode shown in Fig. 1, i.e. the embodiment may be used just to examine
Survey CAN_L lines whether shorted to earth, when CAN_L line shorted to earths, the CAN_L lines input to the second switch control unit to be believed
Number to control the disconnection of the second switch control unit, second alarm unit enters according to the disconnection of the second switch control unit
Row alarm etc..
Referring to a kind of structural representation of Fig. 3 first switch control units provided, the first switch control unit can be with
Including first resistor R1, second resistance R2 and the first triode Q1, first resistor R1 one end connects the CAN_H lines, and this
The one resistance R1 other end connects first triode Q1 base stage；A second resistance R2 termination power, the second resistance
The R2 other end connects first triode Q1 colelctor electrode；It is single that first triode Q1 emitter stage connects first alarm
Member；The first switch control unit can also include the first voltage-regulator diode D1, first voltage-regulator diode D1 negative pole connection
The CAN_H lines, first voltage-regulator diode D1 plus earth；The first switch control unit can also include the 5th resistance
R5, the 5th resistance R5 one end connect first triode Q1 base stage, the 5th resistance R5 other end ground connection.
First resistor R1 can play pressure drop, i.e., when the voltage of CAN_H lines input is more than first triode Q1's
During conducting voltage, the first resistor R1 can divide a part of voltage, as long as making first triode Q1 base stage and emitter stage
Pressure difference UbeLess times greater than first triode Q1 conducting voltage so that first triode Q1 turn on.Such as the 1st
Pole pipe Q1 is silicone tube, and conducting voltage 0.3V, then first resistor R1 points of a part of voltages are so that UbeMore than 0.3V.This
Two resistance R2 can play metering function, avoid the electric current for flowing into the first triode Q1 excessive and burn out first triode Q1.Should
First voltage-regulator diode D1 can act the cathode voltage for stablizing first voltage-regulator diode D1, such as first voltage-regulator diode D1
Burning voltage be 5V, when first voltage-regulator diode D1 negative pole and positive pole pressure difference (note：The voltage of negative pole is more than positive pole
Voltage) be more than 5V, then first voltage-regulator diode D1 can be by the voltage stabilization of first voltage-regulator diode D1 negative pole in 5V.
5th resistance R5 can play metering function, and it is excessive and burn out first triode Q1 to avoid flowing into first triode Q1.
Optionally, a resistance, one end connection CAN_H of the resistance can also be included in the first switch control unit
Line, the other end connection first resistor R1 of resistance one end.The resistance of the wherein resistance can be set as 0 ohm, in reality
It can carry out protection circuit as fuse in operation.
Referring to a kind of structural representation of Fig. 4 second switch control units provided, the second switch control unit includes
3rd resistor R3, the 4th resistance R4 and the second triode Q2, wherein, 3rd resistor R3 one end connects the CAN_L lines, and this
The three resistance R3 other end connects second triode Q2 base stage；A 4th resistance R4 termination power, the 4th resistance
The R4 other end connects second triode Q2 colelctor electrode；It is single that second triode Q2 emitter stage connects second alarm
Member；The second switch control unit can also include the second voltage-regulator diode D2, second voltage-regulator diode D2 negative pole connection
The CAN_L lines, second voltage-regulator diode D2 plus earth；The second switch control unit also includes the 6th resistance R6 and electricity
Hold C, the 6th resistance R6 one end connects second triode Q2 base stage, the 6th resistance R6 other ends ground connection, electric capacity C
One end connect the 6th resistance R6 one end, electric capacity C other end ground connection.
3rd resistor R3 can play pressure drop, i.e., when the voltage of CAN_L lines input is more than second triode Q2's
During conducting voltage, the 3rd resistor R3 can divide a part of voltage, as long as making second triode Q2 base stage and emitter stage
Pressure difference UbeConducting voltage more than second triode Q2 is so that second triode Q2 is turned on.Such as second triode
Q2 is silicone tube, and conducting voltage 0.3V, then 3rd resistor R3 points of a part of voltages are so that UbeMore than 0.3V.4th electricity
Resistance R4 can play metering function, avoid the electric current for flowing into the second triode Q2 excessive and burn out second triode Q2.This second
Voltage-regulator diode D2 can act the cathode voltage for stablizing second voltage-regulator diode D2, such as second voltage-regulator diode D2
Burning voltage is 5V, when second voltage-regulator diode D2 negative pole and the pressure difference (note of positive pole：The voltage of negative pole is more than the electricity of positive pole
Pressure) be more than 5V, then second voltage-regulator diode D2 can be by the voltage stabilization of second voltage-regulator diode D2 negative pole in 5V.
6th resistance R6 can play metering function, and it is excessive and burn out second triode Q2 to avoid flowing into second triode Q2.Should
Electric capacity C can filter out the AC signal in the second switch control unit, prevent AC signal to the second switch control unit
Interfere.
Optionally, a resistance, one end connection CAN_L of the resistance can also be included in the second switch control unit
Line, the other end connection 3rd resistor R3 of resistance one end.The resistance of the wherein resistance can be set as 0 ohm, in reality
It can carry out protection circuit as fuse in operation.
Wherein, first alarm unit can include the first light emitting diode D3, wherein first light emitting diode D3's
Positive pole connects first triode Q1 emitter stage, first light emitting diode D3 negative pole ground connection.The second alarm unit bag
The second light emitting diode D4 is included, wherein second light emitting diode D4 positive pole connects second triode Q2 emitter stage, should
Second light emitting diode D4 negative pole ground connection.
Description with reference to Fig. 3, Fig. 4 and to first alarm unit, second alarm unit, it can be combined into shown in Fig. 5
Another CAN signal line shorted to earth test device.Wherein CAN_H lines and CAN_L lines in normal operating conditions
When, a pair of differential signals are respectively transmitted, the form of signal can be as shown in Fig. 5 (a), and data transfer is with CAN_H lines, CAN_L lines
Differential signalling form of the level of transmission between 1.5V, 3.5V is present, when there is no data transfer on network, output level
Persistently maintain 2.5V outputs.The data-signal of transmission subtracts the mathematic interpolation drawn after CAN_L line signals with CAN_H lines, and
It is ultimately converted to data signal.Wherein all level signals are all to be used as reference using the signal ground in CAN circuit loop.And reality should
The signal ground of many controllers (is connected) equipotential link with controller metal shell with installation vehicle frame in.
Circuit diagram as shown in Figure 5, when CAN_H lines are in normal condition, the average voltage of CAN_H lines input can be with
Turned on for 2.5V, first triode Q1, first light emitting diode D3 lights；Conversely, when CAN_H line shorted to earths, should
The voltage of CAN_H lines input can be 0V, and first triode Q1 ends, and first light emitting diode D3 does not light to be reported
It is alert；Similarly, when CAN_L lines are in normal condition, the average voltage of CAN_L lines input can be 2.5V, the two or three pole
Pipe Q2 is turned on, and second light emitting diode D4 lights；Conversely, when CAN_L line shorted to earths, the voltage of CAN_L lines input
Can be 0V, second triode Q2 ends, and second light emitting diode D4 does not light to be alarmed.
Optionally, shell ground plug and reserved opening plug can also be included in the CAN signal line shorted to earth test device,
Shell ground plug earthed, can be to be used as a kind of ground connection socket；The reserved opening plug earthed, a kind of expand can be used as to insert
Mouthful, in order to which expansion of circuit module etc. is carried out by the socket in follow-up research and development improvement.Another kind wherein as shown in Figure 6
CAN signal line shorted to earth test device, the power Vcc socket, the CAN_H line jacks, CAN_L line jacks, the ground connection socket
Can uniformly it be placed in connector jack panel with the reserved opening plug, to facilitate tester to use.
Flow chart described in the utility model is only one embodiment, without departing from spirit of the present utility model
In the case of to this diagram or the utility model in step can have it is a variety of modification change.Such as can be in different order hold
These steps of row, either can increase, delete or change some steps.Those of ordinary skill in the art are appreciated that to realize
All or part of flow of above-described embodiment, and the equivalent variations made according to the utility model claims, still fall within practical new
The scope that type is covered.
Claims (10)
- A kind of 1. CAN signal line shorted to earth test device, it is characterised in that the test device include ON-OFF control circuit and Warning circuit, wherein：The input connection controller local area network CAN signal line of the ON-OFF control circuit, the ON-OFF control circuit it is defeated Go out end and connect the warning circuit；When the CAN signal line shorted to earth, the CAN signal line is to the ON-OFF control circuit input signal to control The disconnection of ON-OFF control circuit is stated, the warning circuit is alarmed according to the disconnection of the ON-OFF control circuit.
- 2. test device as claimed in claim 1, it is characterised in that the CAN signal line includes high signal line CAN_H lines With low level signal line CAN_L lines, the ON-OFF control circuit includes first switch control unit and second switch control unit, institute Stating warning circuit includes the first alarm unit and the second alarm unit, wherein：The input of the first switch control unit connects the CAN_H lines, and the CAN_H lines control to the first switch Cell input signal is to control the disconnection of the first switch control unit；When the CAN_H lines shorted to earth, described first The output end of switch control unit connects first alarm unit, and first alarm unit controls according to the first switch The disconnection of unit is alarmed；The input of the second switch control unit connects the CAN_L lines, and the CAN_L lines control to the second switch Cell input signal is to control the disconnection of the second switch control unit；When the CAN_L lines shorted to earth, described second The output end of switch control unit connects second alarm unit, and second alarm unit controls according to the second switch The disconnection of unit is alarmed.
- 3. test device as claimed in claim 2, it is characterised in that the first switch control unit include first resistor, Second resistance and the first triode, wherein：One end of the first resistor connects the CAN_H lines, and the other end of the first resistor connects first triode Base stage；One termination power of the second resistance, the other end of the second resistance connect the current collection of first triode Pole；The emitter stage of first triode connects first alarm unit.
- 4. test device as claimed in claim 3, it is characterised in that the second switch control unit include 3rd resistor, 4th resistance and the second triode, wherein：One end of the 3rd resistor connects the CAN_L lines, and the other end of the 3rd resistor connects second triode Base stage；One termination power of the 4th resistance, the other end of the 4th resistance connect the current collection of second triode Pole；The emitter stage of second triode connects second alarm unit.
- 5. test device as claimed in claim 4, it is characterised in that first alarm unit includes the first light-emitting diodes Pipe, wherein the positive pole of first light emitting diode connects the emitter stage of first triode, first light emitting diode Negative pole ground connection.
- 6. test device as claimed in claim 5, it is characterised in that second alarm unit includes the second light-emitting diodes Pipe, wherein the positive pole of second light emitting diode connects the emitter stage of second triode, second light emitting diode Negative pole ground connection.
- 7. test device as claimed in claim 6, it is characterised in that the first switch control unit also includes the first voltage stabilizing Diode, wherein the negative pole of first voltage-regulator diode connects the CAN_H lines, the positive pole of first voltage-regulator diode connects Ground.
- 8. test device as claimed in claim 7, it is characterised in that the second switch control unit also includes the second voltage stabilizing Diode, wherein the negative pole of second voltage-regulator diode connects the CAN_L lines, the positive pole of second voltage-regulator diode connects Ground.
- 9. test device as claimed in claim 8, it is characterised in that the first switch control unit also includes the 5th electricity Resistance, the second switch control unit also includes the 6th resistance and electric capacity, wherein one end of the 5th resistance connects described the The base stage of one triode, the other end ground connection of the 5th resistance；One end of 6th resistance connects second triode Base stage, the 6th resistance other end ground connection, one end of the electric capacity connects one end of the 6th resistance, the electric capacity The other end is grounded.
- 10. a kind of automobile controller, it is characterised in that the automobile controller includes the survey described in any one of claim 1 to 9 Trial assembly is put.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720067211.6U CN206804769U (en) | 2017-01-19 | 2017-01-19 | A kind of CAN signal line shorted to earth test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720067211.6U CN206804769U (en) | 2017-01-19 | 2017-01-19 | A kind of CAN signal line shorted to earth test device |
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| Publication Number | Publication Date |
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| CN206804769U true CN206804769U (en) | 2017-12-26 |
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| CN201720067211.6U Active CN206804769U (en) | 2017-01-19 | 2017-01-19 | A kind of CAN signal line shorted to earth test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064346A (en) * | 2017-01-19 | 2018-05-22 | 深圳欣锐科技股份有限公司 | A kind of CAN signal line shorted to earth test device |
-
2017
- 2017-01-19 CN CN201720067211.6U patent/CN206804769U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108064346A (en) * | 2017-01-19 | 2018-05-22 | 深圳欣锐科技股份有限公司 | A kind of CAN signal line shorted to earth test device |
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