CN207573659U - A kind of LED protection circuit for car light - Google Patents
A kind of LED protection circuit for car light Download PDFInfo
- Publication number
- CN207573659U CN207573659U CN201720910411.3U CN201720910411U CN207573659U CN 207573659 U CN207573659 U CN 207573659U CN 201720910411 U CN201720910411 U CN 201720910411U CN 207573659 U CN207573659 U CN 207573659U
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- Prior art keywords
- triode
- circuit
- led
- voltage
- feedback circuits
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- 230000004224 protection Effects 0.000 title claims abstract description 15
- 239000003381 stabilizer Substances 0.000 claims abstract description 32
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012913 prioritisation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model is related to the lighting technical fields of automobile; more particularly to a kind of LED protection circuit for car light; including several groups of 1 circuits of N, the first triode Q1 and the 4th voltage-stabiliser tube D4; 1 circuits of N include 1 feedback circuits of open circuit N, 1 feedback circuits of short circuit N and triode switch; breaking 1 feedback circuits of N include the 5th triode Q5 and the first diode D1, and short-circuit 1 feedback circuits of N include first comparator U1 and the tenth triode Q10.The simple component of the utility model, by the voltage for monitoring LED string cathode, when voltage has variation herein, by breaking 1 feedback circuits of N and short circuit 1 feedback circuits of N, LED strings are controlled respectively to the triode switch between ground, when both without open circuit or without short circuit, LED could be worked normally, once one or more LED open circuit or short circuit occurs, all LED shutdowns, control mode is flexible, at low cost.
Description
Technical field
Lighting technical field more particularly to a kind of LED protection circuit for car light the utility model is related to automobile.
Background technology
With the rapid development of the national economy, automobile is had become as traffic indispensable in human society and means of transport.
The rapid development of current auto industry also proposes increasingly higher demands to automotive safety.There is research data to show Automobile
Lamp has traffic safety important influence.The outer headlamp of vehicle and signal lamp are one of critical components of vehicle safety travel.
LED is a kind of novel semi-conductor light source of high-efficiency environment friendly, the advantage for having other light sources incomparable, in future automobile
It has a bright future in illumination application.LED can be combined into LED array with the different mode such as series, parallel, to meet automotive lighting
The requirement of intensity.For the luminous characteristics of LED, the design of LED drivings should meet the requirement of car light security legislation, in car light method
In terms of rule, a regulation closely related with LED is exactly N-1 regulations.In vehicle light illumination application, general list LED can not expire
Therefore sufficient demand, often realizes lighting demand with the mode of plurality of LEDs serial or parallel connection, and if requiring wherein to have
One LED breaks down, and the luminous flux of the LED of remaining work remains to the minimum luminous flux for meeting vehicle light illumination regulation, either
Remaining LED is all off.N-1 circuits need short circuit and open circuit that can realize, at present, are realized with simple component disconnected
Road N-1, and short circuit N-1 does not do or carries function using integrated drive chips to realize, not only circuit is complicated but also of high cost.
Utility model content
The utility model provides a kind of LED for car light that can realize breaking N-1 and short circuit N-1 simultaneously and protects
Circuit.
In order to realize the purpose of this utility model, used technical solution is：A kind of LED for car light protects electricity
Road, including several groups of N-1 circuits, the first triode Q1 and the 4th voltage-stabiliser tube D4, every group of N-1 circuit includes open circuit N-1 and feeds back
Circuit, short circuit N-1 feedback circuits and triode switch, one end of breaking N-1 feedback circuits are connected with the LED cathode gone here and there, short circuit
One end of N-1 feedback circuits is connected with the other end of open circuit N-1 feedback circuits, the other end of short-circuit N-1 feedback circuits and three poles
One end of pipe switch is connected, the other end ground connection of triode switch；Breaking N-1 feedback circuits include the 5th triode Q5 and first
The collector of diode D1, the cathode of the 4th voltage-stabiliser tube D4 and the first triode Q1 are connected with the anode of power supply, and first
The emitter of triode Q1 is connected with the anode of the 4th voltage-stabiliser tube D4, the collector of the 5th triode Q5 and the first diode D1
Anode be connected with the anode of power supply, the cathode of the first diode D1 is connected with the base stage of the first triode Q1；Short circuit
N-1 feedback circuits include first comparator U1 and the tenth triode Q10, the electrode input end of first comparator U1 and the five or three pole
The base stage of pipe Q5 is connected, and the output terminal of first comparator U1 is connected with the base stage of the tenth triode Q10, the tenth triode Q10's
Emitter is connected with the anode of power supply, the emitter ground connection of the tenth triode Q10.
As the prioritization scheme of the utility model, triode switch includes the second triode Q2 and the 11st triode
Q11, the base stage of the second triode Q2 are connected with the cathode of the 4th voltage-stabiliser tube D4, the collector and the five or three of the second triode Q2
The base stage of pole pipe Q5 is connected, and the emitter of the second triode Q2 is connected with the collector of the 11st triode Q11, the 11st pole
The base stage of pipe Q11 is connected with the tenth triode Q10 collectors, the emitter ground connection of the 11st triode Q11.
As the prioritization scheme of the utility model, the 5th voltage-stabiliser tube D5 is further included for the LED protection circuit of car light, the 5th
The cathode of voltage-stabiliser tube D5 is connected with the negative input of first comparator U1, the plus earth of the 5th voltage-stabiliser tube D5.
The utility model has positive effect：The utility model all realizes N-1 with simple component, short interruption
Circuit is protected, by monitoring the voltage of LED string cathode, when voltage has variation herein, passes through breaking N-1 feedback circuits and short circuit
N-1 feedback circuits control LED strings to two triode switches (with logic) between ground, both without breaking or not short respectively
Lu Shi, LED could be worked normally, once one or more LED open circuit or short circuit occurs, all LED shutdowns, control mode spirit
It is living, and cost can be reduced.
Description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the functional block diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Wherein：1st, LED goes here and there, and 2, open circuit N-1 feedback circuits, 3, short circuit N-1 feedback circuits, 4, triode switch.
Specific embodiment
As shown in Figs. 1-2, the utility model discloses a kind of LED protection circuit for car light, including several groups of N-1 electricity
Road, the first triode Q1 and the 4th voltage-stabiliser tube D4, every group of N-1 circuit includes open circuit N-1 feedback circuits 2, short circuit N-1 is fed back
Circuit 3 and triode switch 4, one end of breaking N-1 feedback circuits 2 are connected with the cathode of LED strings 1, short-circuit N-1 feedback circuits 3
One end be connected with the other end of open circuit N-1 feedback circuits 2, the other ends of short-circuit N-1 feedback circuits 3 and triode switch 4
One end is connected, the other end ground connection of triode switch 4；Breaking N-1 feedback circuits 2 include the 5th triode Q5 and the first diode
The collector of D1, the cathode of the 4th voltage-stabiliser tube D4 and the first triode Q1 are connected with the anode of power supply, the first triode
The emitter of Q1 is connected with the anode of the 4th voltage-stabiliser tube D4, and the anode of the collector of the 5th triode Q5 and the first diode D1 are equal
It is connected with the anode of power supply, the cathode of the first diode D1 is connected with the base stage of the first triode Q1；Short-circuit N-1 feedbacks
Circuit 3 includes first comparator U1 and the tenth triode Q10, the electrode input end of first comparator U1 and the 5th triode Q5's
Base stage is connected, and the output terminal of first comparator U1 is connected with the base stage of the tenth triode Q10, the emitter of the tenth triode Q10
It is connected with the anode of power supply, the emitter ground connection of the tenth triode Q10.Wherein, the 4th voltage-stabiliser tube D4 is 3V voltage-stabiliser tubes.
Triode switch 4 includes the second triode Q2 and the 11st triode Q11, the base stage and the 4th of the second triode Q2
The cathode of voltage-stabiliser tube D4 is connected, and the collector of the second triode Q2 is connected with the base stage of the 5th triode Q5, the second triode Q2
Emitter be connected with the collector of the 11st triode Q11, the base stage of the 11st triode Q11 and the tenth triode Q10 collection
Electrode is connected, the emitter ground connection of the 11st triode Q11.
The 5th voltage-stabiliser tube D5 is further included for the LED protection circuit of car light, the cathode of the 5th voltage-stabiliser tube D5 is compared with first
The negative input of device U1 is connected, the plus earth of the 5th voltage-stabiliser tube D5.
If there is multi-string LED, as shown in Fig. 2, the cathode of the second diode D2 is connected with the base stage of the first triode Q1, the
The base stage of three triode Q3 is connected with the cathode of the 4th voltage-stabiliser tube D4, and all LED strings share the 4th voltage-stabiliser tube D4 and first
Triode Q1.
First resistor R1, the 11st resistance R11, second resistance R2, the 5th are further included for the LED protection circuit of car light
Resistance R5, the 14th resistance R14 and the 17th resistance R17, one end of first resistor R1 are connected with the anode of power supply, and first
The other end of resistance R1 is connected with the cathode of the 4th voltage-stabiliser tube D4；One end of 11st resistance R11 and the anode phase of power supply
Even, the other end of the 11st resistance R11 is connected with the collector of the 5th triode Q5；One end of second resistance R2 and the five or three pole
The base stage of pipe Q5 is connected, and the electrode input end of the other end first comparator U1 of second resistance R2 is connected；The one of 5th resistance R5
End is connected with the other end of second resistance R2, and the other end of the 5th resistance R5 is connected with the output terminal of first comparator U1；Tenth
One end of four resistance R14 is connected with the emitter of the 11st triode Q11, the other end ground connection of the 14th resistance R14；17th
One end of resistance R17 is connected with the anode of power supply, the cathode phase of the other end and the 5th voltage-stabiliser tube D5 of the 17th resistance R17
Even.
Wherein, the 4th voltage-stabiliser tube D4 manufactures a reference voltage, and first comparator U1 monitors the big of LED 1 cathode voltages of string
Small, first comparator U1 is compared LED 1 cathode voltages of string with reference voltage, if short circuit occur in LED strings 1, LED strings 1 are negative
Pole tension can reduce, and the state of first comparator U1 is caused to change, and turn off LED strings 1 with this, realize short circuit N-1；If
There is open circuit in LED strings 1, and the cathode voltage of LED strings 1 changes, and turns off all LED, realizes open circuit N-1.As long as open circuit N-1 is anti-
Current feed circuit 2 or the one of generation of short circuit N-1 feedback circuits 3, just turn off LED strings 1.
By taking LED strings 1 as an example, LED strings 1 include LED1, LED2 and LED3, it is assumed that the pressure drop per LED is 2V, normal condition
Under, the cathode voltage of LED3 is 12-2*3=6V, then the 5th triode Q5 is connected, the plus earth of the first diode D1, first
Triode Q1 is not turned on, and the 4th voltage-stabiliser tube D4 of 3V are not short-circuited, so, the second triode Q2, third transistor Q3 and the four or three
The base voltage of pole pipe Q4 is 3V, is all connected, it is assumed that all LED do not occur the situation of open circuit, then the 11st pole
Pipe Q11, octode Q8 and the 9th triode Q9 are also connected, and all LED are just always on.If there is open circuit in LED strings 1, the 5th
Triode Q5 is not turned on, and the anode of the first diode D1 is caused to connect height, the first triode Q1 is connected, and the 4th voltage-stabiliser tube D4 is short
The base voltage of road, the second triode Q2, third transistor Q3 and the 4th triode Q4 are 0, i.e. the second triode Q2,
Three triode Q3 and the 4th triode Q4 are not turned on, then other two strings LED is also turned off, and can realize breaking N-1 protections.
By taking LED strings 1 as an example, it is assumed that the pressure drop per LED is 2V.Under normal condition, the cathode voltage of LED3 is 12-2*3
=6V, less than the reference voltage 6.2V (the 5th voltage-stabiliser tube D5 is provided) of the cathode of three comparators, then first comparator U1
Low level is exported, the tenth triode Q10 is not turned on, and the 11st triode Q11 base stages connect height, conducting, it is assumed that LED does not occur at this time
The situation of open circuit, all LED are bright.If short circuit occurs for LED1, the voltage of LED3 cathode can increase to 8V, more than comparator cathode
Reference voltage, comparator output high level, the tenth triode Q10 conductings, the 11st triode Q11, the 8th triode Q8, the 9th
Triode Q9 base stages are all grounded, and are all not turned on, and then all LED are turned off, and can realize short-circuit N-1 protections.
Particular embodiments described above has carried out into one the purpose of this utility model, technical solution and advantageous effect
Step is described in detail, it should be understood that the foregoing is merely specific embodiment of the utility model, is not limited to this
Utility model, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all wrap
Containing being within the protection scope of the utility model.
Claims (3)
1. a kind of LED protection circuit for car light, it is characterised in that：Including several groups of N-1 circuits, the first triode Q1 and
Four voltage-stabiliser tube D4, every group of N-1 circuit include open circuit N-1 feedback circuits (2), short circuit N-1 feedback circuits (3) and triode switch
(4), one end of breaking N-1 feedback circuits (2) is connected with the cathode of LED strings (1), and one end of short-circuit N-1 feedback circuits (3) is with breaking
The other end of road N-1 feedback circuits (2) is connected, the other end of short-circuit N-1 feedback circuits (3) and one end of triode switch (4)
It is connected, the other end ground connection of triode switch (4)；The breaking N-1 feedback circuits (2) include the 5th triode Q5 and first
The collector of diode D1, the cathode of the 4th voltage-stabiliser tube D4 and the first triode Q1 are connected with the anode of power supply, and first
The emitter of triode Q1 is connected with the anode of the 4th voltage-stabiliser tube D4, the collector of the 5th triode Q5 and the first diode D1's
Anode is connected with the anode of power supply, and the cathode of the first diode D1 is connected with the base stage of the first triode Q1；Short-circuit N-1
Feedback circuit (3) includes first comparator U1 and the tenth triode Q10, the electrode input end of first comparator U1 and the five or three pole
The base stage of pipe Q5 is connected, and the output terminal of first comparator U1 is connected with the base stage of the tenth triode Q10, the tenth triode Q10's
Emitter is connected with the anode of power supply, the emitter ground connection of the tenth triode Q10.
2. a kind of LED protection circuit for car light according to claim 1, it is characterised in that：The triode is opened
It closes (4) and includes the second triode Q2 and the 11st triode Q11, the base stage of the second triode Q2 and the cathode of the 4th voltage-stabiliser tube D4
It is connected, the collector of the second triode Q2 is connected with the base stage of the 5th triode Q5, the emitter and the tenth of the second triode Q2
The collector of one triode Q11 is connected, and the base stage of the 11st triode Q11 is connected with the tenth triode Q10 collectors, and the 11st
The emitter ground connection of triode Q11.
3. a kind of LED protection circuit for car light according to claim 2, it is characterised in that：It is described for car light
LED protection circuit further includes the 5th voltage-stabiliser tube D5, the cathode of the 5th voltage-stabiliser tube D5 and the negative input phase of first comparator U1
Even, the plus earth of the 5th voltage-stabiliser tube D5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720910411.3U CN207573659U (en) | 2017-07-25 | 2017-07-25 | A kind of LED protection circuit for car light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720910411.3U CN207573659U (en) | 2017-07-25 | 2017-07-25 | A kind of LED protection circuit for car light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207573659U true CN207573659U (en) | 2018-07-03 |
Family
ID=62697817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720910411.3U Withdrawn - After Issue CN207573659U (en) | 2017-07-25 | 2017-07-25 | A kind of LED protection circuit for car light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207573659U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575012A (en) * | 2017-07-25 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of LED protection circuit for car light |
-
2017
- 2017-07-25 CN CN201720910411.3U patent/CN207573659U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108575012A (en) * | 2017-07-25 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of LED protection circuit for car light |
| CN108575012B (en) * | 2017-07-25 | 2023-12-26 | 常州星宇车灯股份有限公司 | LED protection circuit for car lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180703 Effective date of abandoning: 20231226 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180703 Effective date of abandoning: 20231226 |