CN207543081U - A kind of switching circuit of automobile bus K line communication levels - Google Patents
A kind of switching circuit of automobile bus K line communication levels Download PDFInfo
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- CN207543081U CN207543081U CN201721381116.XU CN201721381116U CN207543081U CN 207543081 U CN207543081 U CN 207543081U CN 201721381116 U CN201721381116 U CN 201721381116U CN 207543081 U CN207543081 U CN 207543081U
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Abstract
The utility model discloses a kind of switching circuits of automobile bus K line communication levels, including K line communication levels end, communication level switching control end, automobile batteries level terminal, 5V level terminals, diode, field-effect tube and triode, the anode of the diode is connect with the 5V level terminals, the one end of the cathode of the diode respectively with the source electrode of the field-effect tube and the K lines communication level end is connect, the grid of the field-effect tube is connect with the collector of the triode, and the base stage of the triode is connect with the communication level switching control end.It is larger that the utility model overcomes relay scheme device volume, the problem of expensive, the service life and reliability of relay mechanical contact are also less better, in addition the cost of this circuit arrangement is about the 1/4 of relay scheme, it is larger to overcome signal imitation switch internal resistance, driving force is poor, the more expensive weakness of price；The utility model has the advantages that simple in structure, performance is stable and service life is longer.
Description
Technical field
The utility model is related to switching circuit technical field more particularly to a kind of switchings of automobile bus K line communication levels
Circuit.
Background technology
Enter ECU (the Electronic Control Unit) control periods from automobile the 1980s, it is big with the U.S. three
Motor corporation begins to monitor automotive control system with ECU for the automaker of representative.But the ECU and fault diagnosis of each manufacturer
Equipment is respectively developed by each automaker, diagnoses interface and communication mode is different, it is impossible to is general mutually.
Thus various comprehensive diagnos equipment are developed in market after automobile, it passes through each communication to automobile OBD-16 diagnosis seats
Pin carries out agreement scanning, the protocol type of the electric-control system of analysis judgement automobile, and then realizes various automatically controlled to more vehicle systems
The self-service diagnosis of system.But due to each automobile vendor to the use of K line communication levels in addition to the Vbat of mainstream, have a small number of manufacturers
Also use 5V level.Thus comprehensive diagnos equipment also to realize communication level can be carried out between Vbat and 5V selection conversion with
Communication level with ECU settings.
Utility model content
The purpose of this utility model is that solve the above-mentioned problems and provides a kind of automobile bus K line communication levels
Switching circuit.
The utility model is achieved through the following technical solutions above-mentioned purpose：
The utility model includes K line communication levels end, communication level switching control end, automobile batteries level terminal, 5V level
End, diode, field-effect tube and triode, the anode of the diode are connect with the 5V level terminals, and the diode is born
The one end of pole respectively with the source electrode of the field-effect tube and the K lines communication level end is connect, the grid of the field-effect tube with
The collector connection of the triode, the base stage of the triode are connect with the communication level switching control end.
The utility model is preferred, the one end at the K lines communication level end also respectively with the first capacitor and the second capacitance
One end connection of device, the other end of first capacitor are grounded after being connected with the other end of second capacitor.
The utility model is preferred, the grid after the drain series first resistor device of the field-effect tube with the field-effect tube
Pole connects.
The utility model is preferred, and second is connected between the collector of the grid of the field-effect tube and the triode
Resistor.
The utility model is preferred, and is connected between the base stage of the triode and the communication level switching control end
Three resistors.
The beneficial effects of the utility model are：
It is larger that the utility model overcomes relay scheme device volume, it is expensive the problem of, relay mechanical contact
Service life and reliability it is also less better, in addition the cost of this circuit arrangement is about the 1/4 of relay scheme, overcomes letter
Number analog switch internal resistance is larger, and driving force is poor, the more expensive weakness of price；The utility model have it is simple in structure, performance is steady
The advantages of fixed and service life is longer.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the switching circuit of automobile bus K line communication levels described in the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in Figure 1：Including K line communication levels end VO, communication level switching control end RLVO, automobile batteries level terminal
Vbat, 5V level terminal L, diode D2, field-effect tube Q11 and triode Q9, the anode of diode D2 are connect with 5V level terminals L,
The one end of the cathode of diode D2 respectively with the source electrode of field-effect tube Q11 and K line communication levels end VO is connect, field-effect tube Q11
Grid connect with the collector of triode Q9, the base stage of triode Q9 is connect with communication level switching control end RLVO, and K lines lead to
The one end of one end of letter level terminal VO also respectively with the first capacitor C108 and the second capacitor C69 is connect, the first capacitor
It is grounded after the connection of the other end of the other end of C108 and the second capacitor C69, the drain series first resistor device of field-effect tube Q11
Grid after R141 with field-effect tube Q11 is connect, and is connected between the grid of field-effect tube Q11 and the collector of triode Q9
3rd resistor device R129 is connected between the base stage of two resistor R142, triode Q9 and communication level switching control end RLVO.
The operation principle of the utility model is as follows：
The power supply that K line communication levels are done using cmos fet pipe is gated, while reducing cost, semiconductor devices
Service life, functional reliability are better than the relay scheme of mechanical contact, and it is weak to also avoid signal imitation switch drive ability
The problem of.As shown in Figure 1, when RLVO ends are high level, field-effect tube Q11 conductings, K line communication ends L level is Vbat, when
When RLVO ends are low level, field-effect tube Q11 cut-offs, K lines communication level is 5V.
In conclusion to overcome relay scheme device volume larger for the utility model, it is expensive the problem of, relay
The service life and reliability of mechanical contact are also less better, and in addition the cost of this circuit arrangement is about the 1/4 of relay scheme,
Overcome that signal imitation switch internal resistance is larger, and driving force is poor, the more expensive weakness of price；The utility model has structure letter
The advantages of list, longer performance stabilization and service life.
Those skilled in the art do not depart from the essence and spirit of the utility model, can realize this reality there are many deformation scheme
With novel, the above is only the preferred feasible embodiment of the utility model, not thereby limits to the power of the utility model
Sharp range, all equivalent structure variations made with the utility model specification and accompanying drawing content, is both contained in the utility model
Interest field within.
Claims (5)
1. a kind of switching circuit of automobile bus K line communication levels, it is characterised in that：Including K line communication levels end, communication level
Switching control end, automobile batteries level terminal, 5V level terminals, diode, field-effect tube and triode, the anode of the diode with
5V level terminals connection, the cathode of the diode respectively with the source electrode of the field-effect tube and the K lines communication level end
One end connection, the grid of the field-effect tube connect with the collector of the triode, the base stage of the triode with it is described
Communication level switching control end connects.
2. the switching circuit of automobile bus K line communication levels according to claim 1, it is characterised in that：The K lines communication
The one end of one end of level terminal also respectively with the first capacitor and the second capacitor is connect, the other end of first capacitor and
It is grounded after the other end connection of second capacitor.
3. the switching circuit of automobile bus K line communication levels according to claim 1, it is characterised in that：The field-effect
It is connect after the drain series first resistor device of pipe with the grid of the field-effect tube.
4. the switching circuit of automobile bus K line communication levels according to claim 1, it is characterised in that：The field-effect
Second resistance device is connected between the collector of the grid of pipe and the triode.
5. the switching circuit of automobile bus K line communication levels according to claim 1, it is characterised in that：The triode
Base stage and the communication level switching control end between be connected with 3rd resistor device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381116.XU CN207543081U (en) | 2017-10-24 | 2017-10-24 | A kind of switching circuit of automobile bus K line communication levels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721381116.XU CN207543081U (en) | 2017-10-24 | 2017-10-24 | A kind of switching circuit of automobile bus K line communication levels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207543081U true CN207543081U (en) | 2018-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721381116.XU Active CN207543081U (en) | 2017-10-24 | 2017-10-24 | A kind of switching circuit of automobile bus K line communication levels |
Country Status (1)
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| CN (1) | CN207543081U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111762112A (en) * | 2019-10-24 | 2020-10-13 | 广州瑞修得信息科技有限公司 | OBD (on-board diagnostics) diagnosis equipment and OBD diagnosis equipment interface switching method and device |
-
2017
- 2017-10-24 CN CN201721381116.XU patent/CN207543081U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111762112A (en) * | 2019-10-24 | 2020-10-13 | 广州瑞修得信息科技有限公司 | OBD (on-board diagnostics) diagnosis equipment and OBD diagnosis equipment interface switching method and device |
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