CN107592105A - 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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- CN107592105A CN107592105A CN201711003034.6A CN201711003034A CN107592105A CN 107592105 A CN107592105 A CN 107592105A CN 201711003034 A CN201711003034 A CN 201711003034A CN 107592105 A CN107592105 A CN 107592105A
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- level
- fet
- triode
- line communication
- diode
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- 239000003990 capacitor Substances 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Abstract
The invention discloses a kind of switching circuit 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, FET and triode, the positive pole of the diode is connected with the 5V level terminals, the negative pole of the diode is connected with the source electrode of the FET and the one end at the K lines communication level end respectively, the grid of the FET is connected with the colelctor electrode of the triode, and the base stage of the triode is connected with the communication level switching control end.Instant invention overcomes relay scheme device volume is larger, the problem of expensive, the service life and reliability of relay mechanical contact are also less better, the cost of this other 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 present invention has the advantages of simple in construction, stable performance and service life are longer.
Description
Technical field
The present invention relates to switching circuit technical field, more particularly to a kind of switching circuit of automobile bus K line communication levels.
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 each developed by each automaker, diagnoses interface and communication mode is different, it is impossible to be general mutually.
Thus various comprehensive diagnos equipment are developed in market after automobile, and it passes through each communication to automobile OBD-16 diagnosis seats
Pin carries out agreement scanning, and analysis judges the protocol type of the electric-control system of automobile, and then realizes various automatically controlled to more car systems
The self-service diagnosis of system.But because use of each automobile vendor to K line communication levels is in addition to the Vbat of main flow, there are 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.
The content of the invention
The purpose of the present invention is that to solve the above problems and provides a kind of switching of automobile bus K line communication levels
Circuit.
The present invention is achieved through the following technical solutions above-mentioned purpose：
The present invention includes K line communication levels end, communication level switching control end, automobile batteries level terminal, 5V level terminals, two
Pole pipe, FET and triode, the positive pole of the diode are connected with the 5V level terminals, the negative pole difference of the diode
It is connected with the source electrode of the FET and the one end at the K lines communication level end, the grid of the FET and described three
The colelctor electrode connection of pole pipe, the base stage of the triode are connected with the communication level switching control end.
It is currently preferred, the one end at the K lines communication level end also respectively with the first capacitor and the second capacitor
One end is connected, and the other end of first capacitor is grounded after being connected with the other end of second capacitor.
Currently preferred, the grid after the drain series first resistor device of the FET with the FET connects
Connect.
It is currently preferred, it is connected with second resistance between the colelctor electrode of the grid of the FET and the triode
Device.
It is currently preferred, it is connected with 3rd resistor device between the base stage of the triode and the RLVO ends.
The beneficial effects of the present invention are：
Instant invention overcomes relay scheme device volume is larger, it is expensive the problem of, relay mechanical contact makes
Also less better with life and reliability, the cost of this circuit arrangement is about the 1/4 of relay scheme in addition, overcomes signal mode
Plan switch internal resistance is larger, and driving force is poor, the more expensive weakness of price；The present invention has simple in construction, stable performance and use
The advantages of lasting a long time.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of the switching circuit of automobile bus K line communication levels of the present invention.
Embodiment
The invention will be further described 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, FET Q11 and triode Q9, diode D2 positive pole are connected with 5V level terminals L,
Diode D2 negative pole is connected with FET Q11 source electrode and K line communication levels end VO one end respectively, FET Q11
Grid be connected with triode Q9 colelctor electrode, triode Q9 base stage is connected with communication level switching control end RLVO, and K lines lead to
The one end of letter level terminal VO one end also respectively with the first capacitor C108 and the second capacitor C69 is connected, the first capacitor
It is grounded after the connection of the C108 other end and the second capacitor C69 other end, FET Q11 drain series first resistor device
Grid after R141 with FET Q11 is connected, and is connected between FET Q11 grid and triode Q9 colelctor electrode
3rd resistor device R129 is connected between two resistor R142, triode Q9 base stage and RLVO ends.
The operation principle of the present invention 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 it also avoid signal imitation switch drive ability
The problem of.As shown in figure 1, when RLVO ends are high level, FET Q11 conductings, K line communication ends L level is Vbat, when
When RLVO ends are low level, FET Q11 cut-offs, K lines communication level is 5V.
In summary, instant invention overcomes relay scheme device volume is larger, it is expensive the problem of, relay machinery
The service life and reliability of contact are also less better, and the cost of this circuit arrangement is about the 1/4 of relay scheme in addition, is overcome
Signal imitation switch internal resistance is larger, and driving force is poor, the more expensive weakness of price；The present invention have it is simple in construction, performance is steady
The advantages of fixed and service life is longer.
Those skilled in the art do not depart from the essence and spirit of the present invention, can have various deformation scheme to realize the present invention,
Preferably feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention, it is all with this
The equivalent structure change that description of the invention and accompanying drawing content are made, is both contained within the interest field of the present invention.
Claims (5)
- A kind of 1. 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, FET and triode, the positive pole of the diode with 5V level terminals connection, the negative pole of the diode source electrode with the FET and the K lines communication level end respectively One end connection, the grid of the FET is connected with the colelctor electrode 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 connected, 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 connected after the drain series first resistor device of pipe with the grid of the FET.
- 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 colelctor electrode 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 RLVO ends between be connected with 3rd resistor device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711003034.6A CN107592105A (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 |
|---|---|---|---|
| CN201711003034.6A CN107592105A (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 |
|---|---|
| CN107592105A true CN107592105A (en) | 2018-01-16 |
Family
ID=61043782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711003034.6A Pending CN107592105A (en) | 2017-10-24 | 2017-10-24 | A kind of switching circuit of automobile bus K line communication levels |
Country Status (1)
| Country | Link |
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| CN (1) | CN107592105A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750426A (en) * | 2004-08-31 | 2006-03-22 | Lg电子株式会社 | Power switching device in mobile communication terminal |
| CN201069548Y (en) * | 2007-05-25 | 2008-06-04 | 佛山市顺德区顺达电脑厂有限公司 | Power switching circuit |
| CN202334466U (en) * | 2011-12-09 | 2012-07-11 | 重庆电子工程职业学院 | Change-over switch circuit |
| CN203377676U (en) * | 2013-07-10 | 2014-01-01 | 深圳光启创新技术有限公司 | Power supply automatic switching device and access control system |
| CN204180045U (en) * | 2014-09-04 | 2015-02-25 | 广东利浩信息科技有限公司 | Based on the serial port level chance-over circuit of the intellectual education terminal of Internet of Things |
| CN106356988A (en) * | 2016-10-09 | 2017-01-25 | 珠海市杰理科技有限公司 | Power switching and controlling circuit |
| CN106445863A (en) * | 2016-09-28 | 2017-02-22 | 广州视睿电子科技有限公司 | Interface circuit |
-
2017
- 2017-10-24 CN CN201711003034.6A patent/CN107592105A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1750426A (en) * | 2004-08-31 | 2006-03-22 | Lg电子株式会社 | Power switching device in mobile communication terminal |
| CN201069548Y (en) * | 2007-05-25 | 2008-06-04 | 佛山市顺德区顺达电脑厂有限公司 | Power switching circuit |
| CN202334466U (en) * | 2011-12-09 | 2012-07-11 | 重庆电子工程职业学院 | Change-over switch circuit |
| CN203377676U (en) * | 2013-07-10 | 2014-01-01 | 深圳光启创新技术有限公司 | Power supply automatic switching device and access control system |
| CN204180045U (en) * | 2014-09-04 | 2015-02-25 | 广东利浩信息科技有限公司 | Based on the serial port level chance-over circuit of the intellectual education terminal of Internet of Things |
| CN106445863A (en) * | 2016-09-28 | 2017-02-22 | 广州视睿电子科技有限公司 | Interface circuit |
| CN106356988A (en) * | 2016-10-09 | 2017-01-25 | 珠海市杰理科技有限公司 | Power switching and controlling circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180116 |