CN207098586U - Vehicle-mounted feed protection circuit - Google Patents
Vehicle-mounted feed protection circuit Download PDFInfo
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- CN207098586U CN207098586U CN201720930370.4U CN201720930370U CN207098586U CN 207098586 U CN207098586 U CN 207098586U CN 201720930370 U CN201720930370 U CN 201720930370U CN 207098586 U CN207098586 U CN 207098586U
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- resistance
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- circuit
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Abstract
It the utility model is related to a kind of automobile protection circuit, more particularly to a kind of vehicle-mounted feed protection circuit.Including first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first triode, the second triode, the 3rd triode, FET, the first diode, the second diode, inductance, the first electric capacity and the second electric capacity.First triode can make FET turn off feed circuit in circuit excessively stream, and the first diode can puncture in circuit overvoltage, make the second triode ON, the cut-off of the 3rd triode, and then turn off FET, protect follow-up subassembly not damaged.The vehicle-mounted feed protection circuit of the utility model, the problem of existing vehicle-mounted feed circuit protection system complex is cumbersome, cost is high is can solve the problem that, its circuit composition is extremely simple to be understood, easily realize, zero device is easily purchased, and cost is low.
Description
Technical field
It the utility model is related to a kind of automobile protection circuit, more particularly to a kind of vehicle-mounted feed protection circuit.
Background technology
With being continuously increased for vehicle electronics value volume and range of product, the electronic equipment in automobile is also more and more, automobile
Electronic system and circuit structure it is also increasingly complicated.
Automobile electronic system is made up of each subassembly, and the transmission that some feed sometimes is needed between each subassembly
It can guarantee that normal work.And found in practice, because some subassemblies are exposed to outside for a long time, due to electrostatic, thunder
The influence of factor such as hit, this automobile subassembly failure open circuit or short circuit are may result in, so as to destroy whole automobile power system
Normal work, Driving Operation of Motor Vehicles failure can be produced when serious.
Feed causes power-supply system is destroyed to be generally divided into two kinds of situations, first, subassembly below（Herein referred to as
Two subassemblies）Short circuit generation excessively stream causes subassembly above（Herein referred to as the first subassembly）Overcurrent damage, second, first
Subassembly overvoltage causes sub second subassembly excessive pressure damages below.On the other hand, automobile power supply system is due to being connected with engine,
Compressor, charging system etc., these can cause whole system power supply instability, produce the mutation of corresponding curtage.This
Kind mutation directly can cause subassembly to damage by feeding output to subassembly, long-time overvoltage.
In order to ensure the normal work of automobile circuit system, the feed that the development company such as some automobile components takes at present is electric
Road safeguard measure is extremely cumbersome, has used a set of protection circuit of the electronic component design such as many comparators and MCU, and not only circuit is answered
It is miscellaneous, it is difficult to realize, and cost is higher, takes a lot of work expensive.
Utility model content
The utility model is intended to provide a kind of vehicle-mounted feed protection circuit, can solve the problem that existing vehicle-mounted feed circuit protection system
The problem of system is complicated cumbersome, cost is high.
In order to solve the above-mentioned technical problem, this patent provides following technical scheme：
Vehicle-mounted feed protection circuit, including：
Current foldback circuit, current foldback circuit include first resistor, the 4th resistance, the first triode and FET,
First resistor is connected between the first transistor base and emitter stage, and the first transistor emitter is also used for connecting with the first subassembly
Connect, the first transistor collector is connected with fet gate, and the first transistor base is connected with FET source electrode, field-effect
Pipe drain electrode is used for being connected with the second subassembly, and the 4th resistance is connected between the first transistor base and colelctor electrode；
Overvoltage crowbar, overvoltage crowbar include the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th
Resistance, the 9th resistance, the first diode, the second triode and the 3rd triode, the first diode cathode and the first triode are sent out
Emitter-base bandgap grading is connected, and the 6th resistance is connected between the first diode anode and the second transistor base, and the 5th resistance one end is imitated with field
Tube grid is answered to connect, the other end is connected with the 3rd transistor collector, the 3rd transistor emitter ground connection, the second triode emission
Pole is grounded, and the 7th resistance is connected between base stage and the emitter stage of the second triode, the 8th resistance one end and the second triode current collection
Pole connects, and the 8th resistance other end is provided with enabled input, and the 9th resistance is connected to the second transistor collector and the three or three pole
Between pipe base stage.
The principle and process of the work of the technical solution of the utility model be：
Enabled input is used for controlling the open and close of whole feed circuit, when enabled input input high level：
If the first subassembly and the second subassembly are working properly, the 3rd transistor base is connect enabled by the 8th resistance and the 9th resistance
Input, the 3rd transistor collector connect the first subassembly, the 3rd triode by first resistor, the 4th resistance and the 5th resistance
Conducting, differs only by the conduction voltage drop of the 3rd triode, the 5th resistance is almost grounded between the 5th resistive voltage and ground, and now the
One resistor current is normal, and the pressure drop in first resistor is smaller, and the first triode is not turned on, and fet gate is low level, field
Effect pipe turns on, the normal UNICOM of feed circuit between the first subassembly and the second subassembly；If the second subassembly short circuit causes electricity
The pressure drop increase of road electric current increase, then first resistor, the first triode ON, due to the 5th electric resistance partial pressure, fet gate
Current potential raises, and FET shut-off, the first subassembly of protection is not by overcurrent damage；If the first subassembly is over-pressed, the one or two pole
Manage breakdown, electric current flows through the 6th resistance, with the 7th electric resistance partial pressure, makes the second triode ON, the 8th resistance and the 9th resistance
Junction voltage is equal to collector voltage during the second triode saturation conduction, equivalent to shorted to earth, the 3rd transistor base
Voltage is very low, the 3rd triode close, fet gate current potential rise, FET shut-off, protection the second subassembly not by
Excessive pressure damages；
When enabled input input low level or when not accessing level, the 3rd triode is not turned on, fet gate electricity
Pressure will be constantly in high level, thus FET will always be in off-state, make the first subassembly and the second subassembly
Between feed circuit be held off.
In the utility model, it can be turned on by the first triode in excessively stream and control FET to turn off, Jin Ershi
Existing overcurrent protection, the first diode and the 6th resistance, the 7th resistance, the 9th resistance, the second triode, the second triode, first
Diode can puncture in overvoltage and control FET to turn off, and then realize overvoltage protection, can be with by enabled input
Whether active control protection circuit enables, and strengthens the versatility of circuit, meets the needs of under specified conditions, with prior art phase
Than the technical solution of the utility model circuit composition is extremely simple to be understood, easily realize, zero device is easily purchased, and cost is low.
Further, tell and be in series with inductance between FET drain and the second subassembly.
Inductance can prevent circuital current to be mutated, and the second subassembly of protection is not influenceed by current break.
Further, the inductance and the second subassembly tie point are connected with electric capacity, the capacity earth.
Electric capacity can prevent circuit voltage to be mutated, and the second subassembly of protection is not influenceed by voltage jump.
Further, the electric capacity includes the first electric capacity and the second electric capacity, and the first capacitance value is more than described second
Capacitance value.
First electric capacity is used for preventing voltage jump, and the second electric capacity is used for filtering out high-frequency signal, makes the input of the second subassembly
Voltage is more steady.
Brief description of the drawings
Fig. 1 is the circuit diagram in the vehicle-mounted feed protection circuit embodiments of the utility model.
Embodiment
The utility model is described in further detail below by embodiment：
Description of reference numerals in Fig. 1：First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th
Resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the first electric capacity C1, the second electric capacity C2, first
Diode D1, the second diode D2, the first triode Q1, the second triode Q2, the 3rd triode Q3, FET Q4, inductance
L1, GND, the first subassembly UnitA, the second subassembly UnitB, enabled input EN.
As shown in figure 1, the vehicle-mounted feed protection circuit of the present embodiment includes first resistor R1, second resistance R2, the 3rd electricity
Hinder R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the one or three
Pole pipe Q1, the second triode Q2, the 3rd triode Q3, FET Q4, the first diode D1, the second diode D2, inductance L1,
First electric capacity C1 and the second electric capacity C2.
First resistor R1 one end, second resistance R2 one end, the first diode D1 negative electrodes and the first triode Q1 emitter stages
It is connected with the first subassembly UnitA, the second resistance R2 other ends are connected with the first triode Q1 base stages, the first triode Q1 bases
Connected between pole and the first resistor R1 other ends by 3rd resistor R3,3rd resistor R3 and first resistor R1 tie points are imitated with field
Should the connection of pipe Q4 source electrodes, the first triode Q1 colelctor electrodes are connected with FET Q4 grids, the 4th resistance R4 connection scene effects
Between pipe Q4 source electrodes and grid, FET Q4 drains with passing through the inductance L1 to connect and second between the second subassembly UnitB
Diode D2 connections, inductance L1 are connected with diode anode junction with the first electric capacity C1, the second electric capacity C2, the first electric capacity C1 with
Second electric capacity C2 is in parallel, and the first electric capacity C1 and the second electric capacity C2 ground connection GND, FET Q4 grids and the 5th resistance R5 one end connect
Connect, the 5th resistance R5 other ends are connected with the 3rd triode Q3 colelctor electrodes, the 3rd triode Q3 grounded emitter GND, the 6th electricity
Resistance R6 is connected between the first diode D1 anodes and the second triode Q2 base stages, the second triode Q2 grounded emitter GND, the
Seven resistance R7 are connected between the second triode Q2 base stage and emitter stage, the 8th resistance R8 one end and the second triode Q2 colelctor electrodes
Connection, the 8th resistance R8 other ends are provided with the enabled input EN for being used for receiving outside enable signal, and the 9th resistance R9 is connected to
Between second triode Q2 colelctor electrodes and the 3rd triode Q3 base stages.In the present embodiment, the first diode D1 is preferably voltage stabilizing two
Pole pipe.
When the present embodiment works：
Enabled input is used for controlling the open and close of whole feed circuit, when enabled input EN input high levels
When：If the first subassembly UnitA and the second subassembly UnitB are working properly, the 3rd triode Q3 base stages pass through the 8th resistance
R8 and the 9th resistance R9 connects enabled input, and the 3rd triode Q3 colelctor electrodes pass through first resistor R1, the 4th resistance R4 and the 5th
Resistance R5 connects the first subassembly UnitA, the 3rd triode Q3 conducting, and the 3rd is differed only by between the 5th resistance R5 voltages and ground GND
Triode Q3 conduction voltage drop, the 5th resistance R5 is set almost to be grounded GND, now first resistor R1 electric currents are normal, first resistor R1
On pressure drop it is smaller, the first triode Q1 is not turned on, and FET Q4 grids are low level, FET Q4 conductings, the first son
The normal UNICOM of feed circuit between part UnitA and the second subassembly UnitB；If the second subassembly UnitB short circuits cause circuit
Electric current increases, then first resistor R1 pressure drop increase, the first triode Q1 conductings, due to the 5th resistance R5 partial pressures, FET
Q4 grid potentials raise, and FET Q4 shut-offs, the first subassembly UnitA is not by overcurrent damage for protection；If the first subassembly
UnitA overvoltages, then the first diode D1 is breakdown, and electric current flows through the 6th resistance R6, with the 7th resistance R7 partial pressures, makes the two or three pole
Pipe Q2 conductings, the 8th resistance R8 and the 9th resistance R9 junctions voltage are equal to colelctor electrode electricity during the second triode Q2 saturation conductions
Pressure, equivalent to the short circuits of GND over the ground, the 3rd triode Q3 base voltages are very low, and the 3rd triode Q3 is closed, FET Q4 grids
Current potential raises, and FET Q4 shut-offs, the second subassembly UnitB is not by excessive pressure damages for protection；
When enabled input EN input low levels or when not accessing level, the 3rd triode Q3 is not turned on, FET Q4
Grid voltage will be constantly in high level, thus FET Q4 will always be in off-state, make the first subassembly UnitA
Feed circuit between the second subassembly UnitB is held off.
Above-described is only embodiment of the present utility model, and the general knowledge such as known concrete structure and characteristic is herein in scheme
Do not describe excessively.It should be pointed out that for those skilled in the art, the premise of the utility model structure is not being departed from
Under, several modifications and improvements can also be made, these should also be considered as the scope of protection of the utility model, and these are all without influence
The effect and practical applicability that the utility model is implemented.
Claims (4)
1. vehicle-mounted feed protection circuit, it is characterised in that：Including：
Current foldback circuit, current foldback circuit include first resistor, the 4th resistance, the first triode and FET, and first
Resistance is connected between the first transistor base and emitter stage, and the first transistor emitter is also used for being connected with the first subassembly,
First transistor collector is connected with fet gate, and the first transistor base is connected with FET source electrode, FET
Drain electrode is used for being connected with the second subassembly, and the 4th resistance is connected between the first transistor base and colelctor electrode；
Overvoltage crowbar, overvoltage crowbar include the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th electricity
Resistance, the 9th resistance, the first diode, the second triode and the 3rd triode, the first diode cathode and the first triode emission
Pole is connected, and the 6th resistance is connected between the first diode anode and the second transistor base, the 5th resistance one end and field-effect
Tube grid is connected, and the other end is connected with the 3rd transistor collector, the 3rd transistor emitter ground connection, the second transistor emitter
Ground connection, the 7th resistance are connected between base stage and the emitter stage of the second triode, the 8th resistance one end and the second transistor collector
Connection, the 8th resistance other end are provided with enabled input, and the 9th resistance is connected to the second transistor collector and the 3rd triode
Between base stage.
2. vehicle-mounted feed protection circuit as claimed in claim 1, it is characterised in that：The FET drain and the second sub-portion
Inductance is in series between part.
3. vehicle-mounted feed protection circuit as claimed in claim 2, it is characterised in that：The inductance and the second subassembly tie point
It is connected with electric capacity, the capacity earth.
4. vehicle-mounted feed protection circuit as claimed in claim 3, it is characterised in that：The electric capacity includes the first electric capacity and second
Electric capacity, the first capacitance value are more than the second capacitance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720930370.4U CN207098586U (en) | 2017-07-28 | 2017-07-28 | Vehicle-mounted feed protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720930370.4U CN207098586U (en) | 2017-07-28 | 2017-07-28 | Vehicle-mounted feed protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207098586U true CN207098586U (en) | 2018-03-13 |
Family
ID=61542915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720930370.4U Expired - Fee Related CN207098586U (en) | 2017-07-28 | 2017-07-28 | Vehicle-mounted feed protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207098586U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN110867824A (en) * | 2019-12-18 | 2020-03-06 | 大唐半导体科技有限公司 | Power supply circuit for anti-explosion oil filling tax control machine |
| CN113595029A (en) * | 2021-07-30 | 2021-11-02 | 苏州极目机器人科技有限公司 | Input/output protection circuit |
-
2017
- 2017-07-28 CN CN201720930370.4U patent/CN207098586U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378794A (en) * | 2018-10-18 | 2019-02-22 | 九江精密测试技术研究所 | A kind of protection circuit of fieldbus |
| CN110867824A (en) * | 2019-12-18 | 2020-03-06 | 大唐半导体科技有限公司 | Power supply circuit for anti-explosion oil filling tax control machine |
| CN113595029A (en) * | 2021-07-30 | 2021-11-02 | 苏州极目机器人科技有限公司 | Input/output protection circuit |
| CN113595029B (en) * | 2021-07-30 | 2024-05-17 | 苏州极目机器人科技有限公司 | Input/output protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 511450 Guangzhou, Panyu District, Guangdong, Dalong street, Qinghe East Road, Panyu road bus terminal Nine West Patentee after: GUANGZHOU YICHENG TRAFFIC INFORMATION GROUP Co.,Ltd. Address before: 511450 Guangzhou, Panyu District, Guangdong, Dalong street, Qinghe East Road, Panyu road bus terminal Nine West Patentee before: GUANGZHOU ETRANS TRAFFIC INFORMATION Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 |