CN104035435B - A kind of driving port self-diagnostic circuit - Google Patents
A kind of driving port self-diagnostic circuit Download PDFInfo
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- CN104035435B CN104035435B CN201410270989.8A CN201410270989A CN104035435B CN 104035435 B CN104035435 B CN 104035435B CN 201410270989 A CN201410270989 A CN 201410270989A CN 104035435 B CN104035435 B CN 104035435B
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Abstract
The invention discloses a kind of driving port self-diagnostic circuit, including MCU, audion, field effect transistor, first resistance, second resistance, 3rd resistance, 4th resistance, the source electrode of described field effect transistor connects power supply, drain electrode connects load, grid connects the colelctor electrode of described audion, the base stage of described audion connects control end by described second resistance, grounded emitter, the colelctor electrode of described audion connects power supply by described first resistance, the drain electrode of described field effect transistor connects described MCU by described 3rd resistance, described 3rd resistance passes through described 4th resistance eutral grounding, wherein, also include the 5th resistance, described 5th resistance two ends are connected between drain electrode and the source electrode of described field effect transistor respectively.The present invention can effectively judge open circuit and the short-circuit condition of load equipment, and circuit is simple, and owing to making circuit in running order for a long time, can find the system failure early.
Description
Technical field
The present invention relates to circuit engineering, particularly relate to a kind of driving port self-diagnostic circuit.
Background technology
In the vehicle control device such as automobile, engineering machinery, a lot of electrical equipments need controller when its work of needs by controlling
Device directly provides power to this equipment, in order to ensure the reliability of system, is monitored the state controlling equipment, works as equipment
Break down (short circuit, open circuit) time, system to carry out reporting to the police and corresponding protection act, to ensure the peace of vehicle and personnel
Entirely.
General design is to control port one complicated analog circuit of increase, realizing the state to port by detection voltage
Detection.The circuit structure of this scheme is complicated, and fatal shortcoming is to be only able to detect short-circuit condition and can not detect open-circuit condition.
General implementation is as shown in Figure 1.
This circuit can only judge load short circuits, when load short circuits, controls end (MCU_CON) output high level, beats
Opening M work, it is 0 that R3 is connected terminal voltage with load, and the I/O port detecting of MCU is low level, it is judged that for short circuit；When
During load open circuit, when controlling end (MCU_CON) output high level, controlling M and open, MCU detecting is high level,
Controlling M during the output end to close, the detecting of MCU port is low level, it is impossible to judge whether open circuit.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of driving port self-diagnostic circuit, to solve deficiency of the prior art.
In order to achieve the above object, it is an object of the invention to be achieved through the following technical solutions:
A kind of drive port self-diagnostic circuit, including MCU, audion, field effect transistor, the first resistance, the second resistance,
3rd resistance, the 4th resistance, the source electrode of described field effect transistor connects power supply, and drain electrode connects load, and grid connects described three poles
The colelctor electrode of pipe, the base stage of described audion connects control end, grounded emitter, described audion by described second resistance
Colelctor electrode connect power supply by described first resistance, the drain electrode of described field effect transistor connects described by described 3rd resistance
MCU, described 3rd resistance passes through described 4th resistance eutral grounding, wherein, also includes the 5th resistance, described 5th resistance two
End is connected between drain electrode and the source electrode of described field effect transistor respectively.
Above-mentioned driving port self-diagnostic circuit, wherein, described 3rd resistance, described 4th resistance and the ginseng of described 5th resistance
Array closes the voltage ensureing described MCU sampling end less than the rated operational voltage of described MCU pin.
Above-mentioned driving port self-diagnostic circuit, wherein, when described field effect transistor is closed, flows through the electric current of described 5th resistance
Value is less than or equal to 1mA, the power consumption extra to reduce system.
Compared with the prior art, the beneficial effects of the present invention is:
Can effectively judge open circuit and the short-circuit condition of load equipment, circuit is simple, and owing to making circuit be in work shape for a long time
State, can find the system failure early.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, the illustrative examples of the present invention
And explanation is used for explaining the present invention, it is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows electrical block diagram of the prior art；
Fig. 2 shows that the embodiment of the present invention drives the electrical block diagram of port self-diagnostic circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can mutual groups
Close.
Referring to shown in Fig. 2, the embodiment of the present invention provides one to drive port self-diagnostic circuit, including MCU, audion Q,
Field effect transistor M, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, field effect transistor M
Source electrode connects power supply, and drain electrode connects load, the colelctor electrode of grid connecting triode Q, and the base stage of audion Q passes through second
Resistance R2 connects control end MCU_CON, grounded emitter, and the colelctor electrode of audion Q is by the first resistance R1 even
Connecing power supply, the drain electrode of field effect transistor M connects MCU, the 3rd resistance R3 by the 4th resistance R4 by the 3rd resistance R3
Ground connection, in the inventive solutions, also includes that the 5th resistance R5, the 5th resistance R5 two ends are connected on field effect respectively
Between drain electrode and the source electrode of pipe M.
3rd resistance R3, the parameter combination of the 4th resistance R4 and the 5th resistance R5 ensure that the voltage of MCU sampling end is less than
The rated operational voltage of MCU pin.5th resistance R5 pull-up, i.e. resistance is connected to power supply, it is provided that scene effect pipe M
Under closed mode, it is possible to provide power supply for detecting loop.
In a preferred embodiment of the invention, when field effect transistor M is closed, the current value flowing through the 5th resistance R5 is less than
Equal to 1mA, the power consumption extra to reduce system.
During specific works, circuit can determine whether to load L open circuit and short circuit, when loading L short circuit, controls end MCU_CON
Output high level, opens the work of field effect transistor M, and it is 0 that the 5th resistance R5 is connected terminal voltage with load L, the IO of MCU
Port detecting is low level, it is judged that for short circuit；When load open circuit, when controlling end MCU_CON output high level, control
Field effect transistor M processed is opened, and MCU detecting is high level, controls field effect transistor M and close during output low level, MCU end
Mouth detecting is high level, it is judged that load open circuit, and otherwise load is normal.
The present invention can effectively judge open circuit and the short-circuit condition of load equipment, and circuit is simple, and owing to making circuit be in for a long time
Duty, can find the system failure early.
Above the specific embodiment of the present invention is described in detail, but the present invention has been not restricted to concrete reality described above
Executing example, it is intended only as example.To those skilled in the art, any equivalent modifications and replacement are the most all the present invention's
Among category.Therefore, impartial conversion done without departing from the spirit and scope of the invention and amendment, all should contain
In the scope of the present invention.
Claims (3)
1. drive a port self-diagnostic circuit, including MCU, audion Q, field effect transistor M, the first resistance R1,
Second resistance R2, the 3rd resistance R3, the 4th resistance R4, the source electrode of described field effect transistor M connects power supply, and drain electrode connects
Load L, grid connects the colelctor electrode of described audion Q, and the base stage of described audion Q passes through described second resistance R2
Connecting and control end, grounded emitter, the colelctor electrode of described audion Q connects power supply, institute by described first resistance R1
The drain electrode stating field effect transistor M connects described MCU, described 3rd resistance R3 by described by described 3rd resistance R3
4th resistance R4 ground connection, it is characterised in that also include that the 5th resistance R5, described 5th resistance R5 two ends connect respectively
The drain electrode of described field effect transistor M and source electrode.
Drive port self-diagnostic circuit the most according to claim 1, it is characterised in that described 3rd resistance R3, institute
The parameter combination stating the 4th resistance R4 and described 5th resistance R5 ensures the company of described MCU and described 3rd resistance R3
Connect the voltage rated operational voltage less than described MCU pin of end.
Drive port self-diagnostic circuit the most according to claim 1, it is characterised in that when described field effect transistor M is closed
Time, flow through the current value of described 5th resistance R5 less than or equal to 1mA, the power consumption extra to reduce system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270989.8A CN104035435B (en) | 2014-06-17 | 2014-06-17 | A kind of driving port self-diagnostic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270989.8A CN104035435B (en) | 2014-06-17 | 2014-06-17 | A kind of driving port self-diagnostic circuit |
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| Publication Number | Publication Date |
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| CN104035435A CN104035435A (en) | 2014-09-10 |
| CN104035435B true CN104035435B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410270989.8A Active CN104035435B (en) | 2014-06-17 | 2014-06-17 | A kind of driving port self-diagnostic circuit |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104305527B (en) * | 2014-10-24 | 2018-04-06 | 林光榕 | Infrared induction temperature control electronic cigarette and its temprature control method |
| CN105840541B (en) * | 2016-05-04 | 2017-06-06 | 宁波普瑞均胜汽车电子有限公司 | It is a kind of to export the circuit that air blower enables signal |
| CN107272809B (en) * | 2017-08-14 | 2019-06-14 | 迈普通信技术股份有限公司 | It is automatically switched electric installation and system |
| CN111487528B (en) * | 2020-04-08 | 2022-04-01 | 纳恩博（北京）科技有限公司 | Fault detection method and circuit of power element |
| CN114488993A (en) * | 2021-12-20 | 2022-05-13 | 上海华兴数字科技有限公司 | Circuit state detection device and method |
| CN115494277A (en) * | 2022-08-03 | 2022-12-20 | 中勍科技股份有限公司 | Voltage acquisition circuit with ultralow leakage current |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170983A (en) * | 1997-02-03 | 1998-01-21 | 胡正林 | Multiple fault detector for multiway electric appliance winding |
| CN202075581U (en) * | 2011-03-24 | 2011-12-14 | 奇瑞汽车股份有限公司 | Seat heating control device |
| CN103019143A (en) * | 2011-09-26 | 2013-04-03 | 西门子公司 | Notifying equipment circuit and notifying system |
| JP2014018021A (en) * | 2012-07-11 | 2014-01-30 | Panasonic Corp | On-vehicle charger, motor vehicle mounted with the same, and communication system using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8400261B2 (en) * | 2010-03-26 | 2013-03-19 | Delphi Technologies, Inc. | Interactive phone message control apparatus for a motor vehicle |
-
2014
- 2014-06-17 CN CN201410270989.8A patent/CN104035435B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170983A (en) * | 1997-02-03 | 1998-01-21 | 胡正林 | Multiple fault detector for multiway electric appliance winding |
| CN202075581U (en) * | 2011-03-24 | 2011-12-14 | 奇瑞汽车股份有限公司 | Seat heating control device |
| CN103019143A (en) * | 2011-09-26 | 2013-04-03 | 西门子公司 | Notifying equipment circuit and notifying system |
| JP2014018021A (en) * | 2012-07-11 | 2014-01-30 | Panasonic Corp | On-vehicle charger, motor vehicle mounted with the same, and communication system using the same |
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| CN104035435A (en) | 2014-09-10 |
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