CN107181248B - A kind of protection circuit of electric vehicle instrument - Google Patents
A kind of protection circuit of electric vehicle instrument Download PDFInfo
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- CN107181248B CN107181248B CN201710396958.0A CN201710396958A CN107181248B CN 107181248 B CN107181248 B CN 107181248B CN 201710396958 A CN201710396958 A CN 201710396958A CN 107181248 B CN107181248 B CN 107181248B
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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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Abstract
The present invention relates to a kind of protection circuits, specially one kind prevents instrument electric current when powering on excessive, cause the protection circuit of the electric vehicle instrument of the damage of hardware, including key switch (1), single-chip microcontroller (2), software protection circuit (3) and hardware protection circuit (4), the control terminal of the key switch (1) is connect with single-chip microcontroller (2), the single-chip microcontroller (2) connect with software protection circuit (3) and hardware protection circuit (4) respectively, the appliance circuit of the output end and electric vehicle of the software protection circuit (3) and hardware protection circuit (4) connects；The protection circuit of electric vehicle instrument of the invention prevents instrument electric current when powering on 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, the protection circuit of specially a kind of electric vehicle instrument.
Background technique
Currently, when being powered to electric vehicle instrument power supply, since storage battery power supply termination contact is bad and high-power
Inductive load work when generate high high voltage, when high voltage interference in order to solve power end, to the circuit of connection power supply
Module damages problem, needs in power input using protection circuit, the amplitude for exporting power supply is controlled in certain model
In enclosing.
Summary of the invention
It prevents instrument electric current when powering on excessive to devise one kind to solve the above-mentioned problems, causes the damage of hardware
Electric vehicle instrument protection circuit.
The technical solution adopted by the present invention to solve the technical problems is: a kind of protection circuit of electric vehicle instrument, including
Key switch, single-chip microcontroller, software protection circuit and hardware protection circuit, the control terminal of the key switch are connect with single-chip microcontroller,
The single-chip microcontroller is connect with software protection circuit and hardware protection circuit respectively, the software protection circuit and hardware protection circuit
Output end and electric vehicle appliance circuit connect；The hardware protection circuit includes switch chip Q1, triode Q9, triode
Q10, triode Q11, triode Q12, zener diode D8 and capacitor C12, input terminal PC2 pass through resistance R45 and triode Q12
Emitter connection, the base stage of the triode Q12 is grounded by resistance R46, and collector passes through resistance R43 access switch chip
The 4th pin of Q1, the 4th pin are connect with one end of resistance R42, the first pin of the other end and switch chip Q1, the
Two pins, the connection of third pin, the resistance R42 is in parallel with zener diode D8, the anode and three of the zener diode D8
The emitter of pole pipe Q11 connects, and the base stage of the triode Q11 is connect by resistance R44 with the collector of triode Q10, institute
The collector for stating triode Q11 is connect with one end of resistance R41, and the other end of resistance R41 and the cathode of zener diode D8 connect
It connects, while in parallel with capacitor C12 by resistance R40, one end of the capacitor C12 while the emitter with triode Q9, three poles
The emitter of pipe Q10 connects, and the other end is connect with the base stage of the collector of triode Q9, triode Q10 simultaneously, the triode
The base stage of Q9 accesses input terminal PC1, the 5th pin, the 6th pin, the 7th pin and the 8th pin of the switch chip Q1 with
The output end of circuit connects.
Preferably, the software protection circuit includes the first control resistance R18, the second control resistance R19, triode
Q3, triode Q4, triode Q8 and zener diode D7, the input terminal PC1 pass through the base of current-limiting resistance R11 and triode Q3
Pole connection, the emitter of the triode Q3 are grounded by resistance R1, and collector is connected by the base stage of resistance R15 and triode Q4
It connects, the emitter of the triode Q4 is connect with the base stage of triode Q8, and the emitter and resistance R17 of the triode Q8 connects
It connects, the resistance R17 connects with resistance R15, and the collector of the triode Q4 is controlled with the collector of triode Q8, first simultaneously
One end connection of one end, resistance R38 of resistance R18 processed, 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 supply ad_VIN, institute
The other end for stating resistance R38 is connected by the output end of zener diode D7 and circuit.
Preferably, further include power supply, the power supply respectively with single-chip microcontroller, software protection circuit and hardware package
Protection circuit connection, for entire protection circuit power supply.
The beneficial effects of the present invention are: the protection circuit of electric vehicle instrument of the invention is by way of software and hardware combining,
It prevents instrument electric current when powering on excessive, causes the damage of hardware.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is structural block diagram of the invention.
Fig. 2 is hardware protection circuit figure of the invention.
Fig. 3 is software protection circuit diagram of the invention.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
A kind of protection circuit of electric vehicle instrument, including key switch 1, single-chip microcontroller 2, software protection circuit 3 and hardware package
The control terminal of protection circuit 4, the key switch 1 is connect with single-chip microcontroller 2, the single-chip microcontroller 2 respectively with software protection circuit 3 and hard
Part protects circuit 4 to connect, and the appliance circuit of the output end and electric vehicle of the software protection circuit 3 and hardware protection circuit 4 connects
It connects；The hardware protection circuit includes switch chip Q1, triode Q9, triode Q10, triode Q11, triode Q12, pressure stabilizing
Diode D8 and capacitor C12, input terminal PC2 are connect by resistance R45 with the emitter of triode Q12, the triode Q12's
Base stage is grounded by resistance R46, collector by resistance R43 access switch chip Q1 the 4th pin, the 4th pin with
One end of resistance R42 connects, and the other end is connect with the first pin of switch chip Q1, the second pin, third pin, the resistance
R42 is in parallel with zener diode D8, and the anode of the zener diode D8 is connect with the emitter of triode Q11, three pole
The base stage of pipe Q11 is connect by resistance R44 with the collector of triode Q10, the collector and resistance R41 of the triode Q11
One end connection, the other end of resistance R41 connect with the cathode of zener diode D8, while passing through resistance R40 and capacitor C12 simultaneously
Connection, one end of the capacitor C12 connects with the emitter of the emitter of triode Q9, triode Q10 simultaneously, the other end and meanwhile with
The base stage connection of the collector, triode Q10 of triode Q9, the base stage of the triode Q9 access input terminal PC1, the switch
The 5th pin, the 6th pin, the 7th pin and the 8th pin of chip Q1 and the output end of circuit connect.
The software protection circuit 3 includes the first control resistance R18, the second control resistance R19, triode Q3, triode
Q4, triode Q8 and zener diode D7, the input terminal PC1 are connect by current-limiting resistance R11 with the base stage of triode Q3, institute
The emitter for stating triode Q3 is grounded by resistance R1, and collector is connect by resistance R15 with the base stage of triode Q4, and described three
The emitter of pole pipe Q4 is connect with the base stage of triode Q8, and the emitter of the triode Q8 is connect with resistance R17, the resistance
R17 connects with resistance R15, and the collector of the triode Q4 controls resistance R18's with the collector of triode Q8, first simultaneously
One end connection of one end, resistance R38, 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 ad_VIN, the resistance R38's
The other end is connected by the output end of zener diode D7 and circuit.
Further include power supply, the power supply respectively with single-chip microcontroller 2, software protection circuit 3 and hardware protection circuit 4
Connection, for entire protection circuit power supply.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above 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 range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (3)
1. a kind of protection circuit of electric vehicle instrument, which is characterized in that including key switch (1), single-chip microcontroller (2), software protection
The control terminal of circuit (3) and hardware protection circuit (4), the key switch (1) is connect with single-chip microcontroller (2), the single-chip microcontroller (2)
It is connect respectively with software protection circuit (3) and hardware protection circuit (4), the software protection circuit (3) and hardware protection circuit
(4) appliance circuit of output end and electric vehicle connects；The hardware protection circuit includes switch chip Q1, triode Q9, three
Pole pipe Q10, triode Q11, triode Q12, zener diode D8 and capacitor C12, input terminal PC2 pass through resistance R45 and three poles
The emitter of pipe Q12 connects, and the base stage of the triode Q12 is grounded by resistance R46, and collector is opened by resistance R43 access
The 4th pin of chip Q1 is closed, the 4th pin is connect with one end of resistance R42, the first pipe of the other end and switch chip Q1
Foot, the second pin, the connection of third pin, the resistance R42 is in parallel with zener diode D8, the anode of the zener diode D8
It is connect with the emitter of triode Q11, the base stage of the triode Q11 is connected by the collector of resistance R44 and triode Q10
It connects, the collector of the triode Q11 is connect with one end of resistance R41, the other end of resistance R41 and bearing for zener diode D8
Pole connection, while in parallel with capacitor C12 by resistance R40, one end of the capacitor C12 and meanwhile with the emitter of triode Q9,
The emitter of triode Q10 connects, and the other end is connect with the base stage of the collector of triode Q9, triode Q10 simultaneously, and described three
The base stage of pole pipe Q9 accesses input terminal PC1, the 5th pin, the 6th pin, the 7th pin and the 8th pipe of the switch chip Q1
The connection of the output end of foot and circuit.
2. a kind of protection circuit of electric vehicle instrument according to claim 1, which is characterized in that the software protection circuit
It (3) include the first control resistance R18, the second control resistance R19, triode Q3, triode Q4, triode Q8 and zener diode
D7, the input terminal PC1 are connect by current-limiting resistance R11 with the base stage of triode Q3, and the emitter of the triode Q3 passes through
Resistance R1 ground connection, collector are connect by resistance R15 with the base stage of triode Q4, the emitter and triode of the triode Q4
The base stage of Q8 connects, and the emitter of the triode Q8 is connect with resistance R17, and the resistance R17 connects with resistance R15, described
The one end of the collector of triode Q4 simultaneously with the collector of triode Q8, one end of the first control resistance R18, resistance R38 connects
It connects, the other end of the first control resistance R18 is grounded after connecting with the second control resistance R19, the first control resistance R18
Pass through zener diode D7 with the other end of the second control resistance R19 tie point access control power supply ad_VIN, the resistance R38
It is connect with the output end of circuit.
3. a kind of protection circuit of electric vehicle instrument according to claim 1, which is characterized in that it further include power supply,
The power supply is connect with single-chip microcontroller (2), software protection circuit (3) and hardware protection circuit (4) respectively, for protecting to entire
Protection circuit power supply.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN107181248A CN107181248A (en) | 2017-09-19 |
| CN107181248B true CN107181248B (en) | 2019-09-20 |
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| 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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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 |
|---|---|
| CN107181248A (en) | 2017-09-19 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
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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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 |
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