CN107181248A - A kind of protection circuit of electric vehicle instrument - Google Patents
A kind of protection circuit of electric vehicle instrument Download PDFInfo
- Publication number
- CN107181248A CN107181248A CN201710396958.0A CN201710396958A CN107181248A CN 107181248 A CN107181248 A CN 107181248A CN 201710396958 A CN201710396958 A CN 201710396958A CN 107181248 A CN107181248 A CN 107181248A
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- China
- Prior art keywords
- triode
- resistance
- protection circuit
- pin
- colelctor electrode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of protection circuit, specially one kind prevents that instrument electric current when upper electric is excessive, cause the protection circuit of the electric vehicle instrument of the damage of hardware, including key switch (1), single-chip microcomputer (2), software protection circuit (3) and hardware protection circuit (4), the control end of the key switch (1) is connected with single-chip microcomputer (2), the single-chip microcomputer (2) is connected with software protection circuit (3) and hardware protection circuit (4) respectively, the appliance circuit connection of the output end and electric car of the software protection circuit (3) and hardware protection circuit (4)；The protection circuit of the electric vehicle instrument of the present invention prevents that instrument electric current when upper electric is excessive, causes the damage of hardware by way of software and hardware combining.
Description
Technical field
The present invention relates to a kind of protection circuit, specially a kind of protection circuit of electric vehicle instrument.
Background technology
At present, when being powered to electric vehicle instrument power supply, because storage battery power supply termination contact is bad and high-power
Inductive load work when produce high high voltage, during high voltage interference in order to solve power end, the circuit to connecting power supply
Module causes damage problem, it is necessary to use protection circuit in power input, the amplitude that power supply is exported is controlled in certain model
In enclosing.
The content of the invention
Prevent that instrument electric current when upper electric is excessive so as to devise one kind to solve the above problems, cause the damage of hardware
Electric vehicle instrument protection circuit.
The technical solution adopted for the present invention to solve the technical problems is：A kind of protection circuit of electric vehicle instrument, including
Key switch, single-chip microcomputer, software protection circuit and hardware protection circuit, the control end of the key switch are connected with single-chip microcomputer,
The single-chip microcomputer is connected with software protection circuit and hardware protection circuit respectively, the software protection circuit and hardware protection circuit
Output end and electric car appliance circuit connect；The hardware protection circuit includes switch chip Q1, triode Q9, triode
Q10, triode Q11, triode Q12, voltage-regulator diode D8 and electric capacity C12, input PC2 pass through resistance R46 and triode Q12
Emitter stage connection, the base stage of the triode Q12 is grounded by resistance R45, and colelctor electrode passes through resistance R43 and accesses switch chip
Q1 the 4th pin, the 4th pin is connected with resistance R42 one end, the other end and switch chip Q1 the first pin, the
Two pins, three-prong connection, the resistance R42 are in parallel with voltage-regulator diode D8, the positive pole and three of the voltage-regulator diode D8
Pole pipe Q11 emitter stage connection, the base stage of the triode Q11 is connected by resistance R44 with triode Q10 colelctor electrode, institute
The colelctor electrode for stating triode Q11 is connected with resistance R41 one end, and the resistance R41 other end connects with voltage-regulator diode D8 negative pole
Connect, while in parallel with electric capacity C12 by resistance R40, one end of electric capacity C12 emitter stage simultaneously with triode Q9, three poles
Pipe Q10 emitter stage connection, the other end is connected with triode Q9 colelctor electrode, triode Q10 base stage simultaneously, the triode
Q9 base stage access input PC1, the 5th pin, the 6th pin, the 7th pin and the 8th pin of the switch chip Q1 with
The output end connection of circuit.
Preferably, the software protection circuit includes the first control resistance R18, the second control resistance R19, triode
The base that Q3, triode Q4, triode Q8 and voltage-regulator diode D7, the input PC1 pass through current-limiting resistance R11 and triode Q3
Pole is connected, and the emitter stage of the triode Q3 is grounded by resistance R1, and colelctor electrode is connected by resistance R15 and triode Q4 base stage
Connect, the emitter stage of the triode Q4 is connected with triode Q8 base stage, emitter stage and the resistance R17 of the triode Q8 connect
Connect, the resistance R17 connects with resistance R15, the colelctor electrode of triode Q4 colelctor electrode simultaneously with triode Q8, the first control
Resistance R18 processed one end, resistance R38 one end connection, the other end and the second control resistance of the first control resistance R18
It is grounded after R19 series connection, the first control resistance R18 and the second control resistance R19 tie point Access Control power supplys Vad are described
The resistance R38 other end is connected by the output end of voltage-regulator diode D7 and circuit.
Preferably, also include power supply, the power supply respectively with single-chip microcomputer, software protection circuit and hardware package
Protection circuit is connected, for being powered to whole protection circuit.
The beneficial effects of the invention are as follows:The present invention electric vehicle instrument protection circuit by way of software and hardware combining,
Prevent that instrument electric current when upper electric is excessive, cause the damage of hardware.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is structured flowchart of the invention.
Fig. 2 is hardware protection circuit figure of the invention.
Fig. 3 is software protection circuit diagram of the invention.
Embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These accompanying drawings are simplified schematic diagram, only with
Illustration illustrates the basic structure of the present invention, therefore it only shows the composition relevant with the present invention.
A kind of protection circuit of electric vehicle instrument, including key switch 1, single-chip microcomputer 2, software protection circuit 3 and hardware package
Protection circuit 4, the control end of the key switch 1 is connected with single-chip microcomputer 2, the single-chip microcomputer 2 respectively with software protection circuit 3 and hard
Part protection circuit 4 is connected, and the output end of the software protection circuit 3 and hardware protection circuit 4 and the appliance circuit of electric car connect
Connect；The hardware protection circuit includes switch chip Q1, triode Q9, triode Q10, triode Q11, triode Q12, voltage stabilizing
Diode D8 and electric capacity C12, input PC2 are connected by resistance R46 with triode Q12 emitter stage, the triode Q12's
Base stage is grounded by resistance R45, and colelctor electrode accesses switch chip Q1 the 4th pin by resistance R43, the 4th pin with
Resistance R42 one end connection, the other end is connected with switch chip Q1 the first pin, the second pin, three-prong, the resistance
R42 is in parallel with voltage-regulator diode D8, and the positive pole of the voltage-regulator diode D8 is connected with triode Q11 emitter stage, three pole
Pipe Q11 base stage is connected by resistance R44 with triode Q10 colelctor electrode, colelctor electrode and the resistance R41 of the triode Q11
One end connection, the resistance R41 other end is connected with voltage-regulator diode D8 negative pole, while by resistance R40 and electric capacity C12 simultaneously
Connection, one end of the electric capacity C12 be connected with triode Q9 emitter stage, triode Q10 emitter stage simultaneously, the other end and meanwhile with
Triode Q9 colelctor electrode, triode Q10 base stage connection, the base stage access input PC1 of the triode Q9, the switch
Chip Q1 the 5th pin, the 6th pin, the output end connection of the 7th pin and the 8th pin and circuit.
The software protection circuit 3 includes the first control resistance R18, the second control resistance R19, triode Q3, triode
Q4, triode Q8 and voltage-regulator diode D7, the input PC1 are connected by current-limiting resistance R11 with triode Q3 base stage, institute
The emitter stage for stating triode Q3 is grounded by resistance R1, and colelctor electrode is connected by resistance R15 with triode Q4 base stage, and described three
Pole pipe Q4 emitter stage is connected with triode Q8 base stage, and the emitter stage of the triode Q8 is connected with resistance R17, the resistance
R17 connects with resistance R15, the colelctor electrode of triode Q4 colelctor electrode simultaneously with triode Q8, the first control resistance R18
One end, resistance R38 one end connection, the other end of the first control resistance R18 is connected with the second control resistance R19 to be followed by
Ground, the first control resistance R18 and the second control resistance R19 tie point Access Control power supply Vad, the resistance R38's is another
One end is connected by the output end of voltage-regulator diode D7 and circuit.
Also include power supply, the power supply respectively with single-chip microcomputer 2, software protection circuit 3 and hardware protection circuit 4
Connection, for being powered to whole protection circuit.
Using the above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.
Claims (3)
1. a kind of protection circuit of electric vehicle instrument, it is characterised in that including key switch (1), single-chip microcomputer (2), software protection
Circuit (3) and hardware protection circuit (4), the control end of the key switch (1) are connected with single-chip microcomputer (2), the single-chip microcomputer (2)
It is connected respectively with software protection circuit (3) and hardware protection circuit (4), the software protection circuit (3) and hardware protection circuit
(4) output end and the appliance circuit of electric car is connected；The hardware protection circuit includes switch chip Q1, triode Q9, three
Pole pipe Q10, triode Q11, triode Q12, voltage-regulator diode D8 and electric capacity C12, input PC2 pass through resistance R46 and three poles
Pipe Q12 emitter stage connection, the base stage of the triode Q12 is grounded by resistance R45, and colelctor electrode is opened by resistance R43 accesses
Chip Q1 the 4th pin is closed, the 4th pin is connected with resistance R42 one end, the first pipe of the other end and switch chip Q1
Pin, the second pin, three-prong connection, the resistance R42 are in parallel with voltage-regulator diode D8, the positive pole of the voltage-regulator diode D8
It is connected with triode Q11 emitter stage, the base stage of the triode Q11 is connected by resistance R44 and triode Q10 colelctor electrode
Connect, the colelctor electrode of the triode Q11 is connected with resistance R41 one end, the resistance R41 other end and bearing for voltage-regulator diode D8
Pole is connected, while in parallel with electric capacity C12 by resistance R40, one end of the electric capacity C12 and meanwhile emitter stage with triode Q9,
Triode Q10 emitter stage connection, the other end is connected with triode Q9 colelctor electrode, triode Q10 base stage simultaneously, and described three
Pole pipe Q9 base stage access input PC1, the switch chip Q1 the 5th pin, the 6th pin, the 7th pin and the 8th pipe
The output end connection of pin and circuit.
2. a kind of protection circuit of electric vehicle instrument according to claim 1, it is characterised in that the software protection circuit
(3) the first control resistance R18, the second control resistance R19, triode Q3, triode Q4, triode Q8 and voltage-regulator diode are included
D7, the input PC1 is connected by current-limiting resistance R11 with triode Q3 base stage, and the emitter stage of the triode Q3 passes through
Resistance R1 is grounded, and colelctor electrode is connected by resistance R15 with triode Q4 base stage, the emitter stage and triode of the triode Q4
Q8 base stage connection, the emitter stage of the triode Q8 is connected with resistance R17, and the resistance R17 connects with resistance R15, described
Triode Q4 colelctor electrode is while colelctor electrode, the first control resistance R18 one end, resistance R38 one end with triode Q8 connect
Connect, the other end of the first control resistance R18 is grounded after being connected with the second control resistance R19, the first control resistance R18
With the second control resistance R19 tie point Access Control power supplys Vad, the resistance R38 other end by voltage-regulator diode D7 with
The output end connection of circuit.
3. the protection circuit of a kind of electric vehicle instrument according to claim 1, it is characterised in that also including power supply,
The power supply is connected with single-chip microcomputer (2), software protection circuit (3) and hardware protection circuit (4) respectively, for whole guarantor
Protection circuit is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710396958.0A CN107181248B (en) | 2017-05-31 | 2017-05-31 | A kind of protection circuit of electric vehicle instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710396958.0A CN107181248B (en) | 2017-05-31 | 2017-05-31 | A kind of protection circuit of electric vehicle instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107181248A true CN107181248A (en) | 2017-09-19 |
| CN107181248B CN107181248B (en) | 2019-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710396958.0A Active CN107181248B (en) | 2017-05-31 | 2017-05-31 | A kind of protection circuit of electric vehicle instrument |
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| Country | Link |
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| CN (1) | CN107181248B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204190352U (en) * | 2014-11-26 | 2015-03-04 | 四川长虹欣锐科技有限公司 | Automatically controlled output short circuit protection circuit |
| CN204402181U (en) * | 2014-11-20 | 2015-06-17 | 重庆宁来科贸有限公司 | A kind of electronic sentry possessing monitoring function |
| CN204928080U (en) * | 2015-06-29 | 2015-12-30 | 王金 | Overvoltage protection circuit |
| CN106712506A (en) * | 2017-01-22 | 2017-05-24 | 郑州信工智能化系统有限公司 | Voltage reduction type switching power supply with super-wide input voltage and adjustable output voltage |
| CN206865142U (en) * | 2017-05-31 | 2018-01-09 | 南京懂玫驱动技术有限公司 | A kind of protection circuit of electric vehicle instrument |
-
2017
- 2017-05-31 CN CN201710396958.0A patent/CN107181248B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204402181U (en) * | 2014-11-20 | 2015-06-17 | 重庆宁来科贸有限公司 | A kind of electronic sentry possessing monitoring function |
| CN204190352U (en) * | 2014-11-26 | 2015-03-04 | 四川长虹欣锐科技有限公司 | Automatically controlled output short circuit protection circuit |
| CN204928080U (en) * | 2015-06-29 | 2015-12-30 | 王金 | Overvoltage protection circuit |
| CN106712506A (en) * | 2017-01-22 | 2017-05-24 | 郑州信工智能化系统有限公司 | Voltage reduction type switching power supply with super-wide input voltage and adjustable output voltage |
| CN206865142U (en) * | 2017-05-31 | 2018-01-09 | 南京懂玫驱动技术有限公司 | A kind of protection circuit of electric vehicle instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107181248B (en) | 2019-09-20 |
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Denomination of invention: A protection circuit for electric vehicle instrument Effective date of registration: 20201230 Granted publication date: 20190920 Pledgee: China Construction Bank Corporation Nanjing Jiangbei new area branch Pledgor: NANJING DONGMEI DRIVE TECHNOLOGY Co.,Ltd. Registration number: Y2020980010292 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220512 Granted publication date: 20190920 Pledgee: China Construction Bank Corporation Nanjing Jiangbei new area branch Pledgor: NANJING DMHC SCIENCE&TECHNOLOGY Co.,Ltd. Registration number: Y2020980010292 |