CN206341447U - Self-checking circuit for LED load drive system - Google Patents
Self-checking circuit for LED load drive system Download PDFInfo
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- CN206341447U CN206341447U CN201621214191.2U CN201621214191U CN206341447U CN 206341447 U CN206341447 U CN 206341447U CN 201621214191 U CN201621214191 U CN 201621214191U CN 206341447 U CN206341447 U CN 206341447U
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- led load
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- type triode
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- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a kind of self-checking circuit for LED load drive system, it includes LED load circuit；Signal acquisition circuit, with the first and second photoelectrical couplers, the running parameter for detecting the LED load circuit；Logic latching circuit, with PNP type triode and the first NPN type triode, the fault-signal for locking the LED load drive system；Logic execution circuit, with the second NPN type triode, for when the LED load drive system breaks down, closing LED drive chip or switching LED drive chip to park mode.Pass through the self-checking circuit, it is capable of short circuit or the open circuit fault of the appearance of quick response LED load, LED load drive system is closed in time or resting state is switched to, so as to avoid Exploration on Train Operation Safety of the automobile in the case where LED load drive system is in malfunction.
Description
Technical field
The utility model is related to automotive lighting field, more particularly to a kind of self-checking circuit for LED load drive system.
Background technology
In automobile lighting system, once LED short circuits, then open circuit fault, whole LED drivetrains occur for LED drive system
System can keep LED failure operation, so that the failure situation of illuminator, which can further deteriorate, produces more serious loss,
Such as LED failure causes car light dark, not optically focused partially, larger hidden danger can be brought to traffic safety.Therefore, in automotive lighting row
It is very strict to the detection of the working condition of LED load in industry, whether detection LED drive system is generally gone using monolithic machine testing
Break down, but single chip microcomputer test system is loaded, reaction speed is slow, reliability is relatively low and easily occurs false triggering operation.
Therefore, it is necessary to provide a kind of detection circuit for LED load drive system.
Utility model content
The purpose of this utility model is to provide a kind of self-checking circuit for LED load drive system, passes through signal acquisition
Circuit collection fault-signal, logic latching circuit control disconnection and the logic execution circuit of circuit after fault-signal is received
Restarting and resting state for control LED load drive system, to realize when LED load breaks down, can will appear from failure
LED circuit locking, and LED drive system is restarted or enter resting state, after trouble shooting, self-checking circuit control
LED drive system restarts.
The utility model provides a kind of self-checking circuit for LED load drive system, and the circuit includes：LED load
Circuit；Signal acquisition circuit, with the first photoelectrical coupler and the second photoelectrical coupler, for detecting the LED load circuit
Fault-signal；Logic latching circuit, with PNP type triode and the first NPN type triode, for locking the failure letter
Number；With logic execution circuit, with the second NPN type triode, for receiving the fault-signal, and LED driving cores are closed
Piece switches the LED drive chip to park mode.
In one embodiment, LED load circuit includes：The positive pole of first LED load is connected with the positive pole of the second LED load,
The negative pole of second LED load is connected with the positive pole of the 3rd LED load, and the negative pole and the 4th LED of the 3rd LED load are born
The negative pole connection of load, the positive pole of the 4th LED load is connected with the negative pole of first LED load.
In one embodiment, the first photoelectrical coupler has first, second, third and fourth pin, and second light
Electric coupler has the five, the six, the 7th and the 8th pin；Wherein, first pin connects first photoelectrical coupler
Light emitting diode positive pole；Second pin connects the negative pole of the light emitting diode of first photoelectrical coupler；It is described
Three-prong connects the drain electrode of the phototriode of first photoelectrical coupler；4th pin connects first photoelectricity
The source electrode of the phototriode of coupler；5th pin is connecting the light emitting diode of second photoelectrical coupler just
Pole；6th pin connects the negative pole of the light emitting diode of second photoelectrical coupler；The 7th pin connection is described
The drain electrode of the phototriode of second photoelectrical coupler；8th pin connects photosensitive three pole of second photoelectrical coupler
The source electrode of pipe.Further, first pin and the 6th pin are connected to Section Point, second pin and institute
State the 5th pin and be connected to first node；And, the three-prong and the 7th pin are connected to the positive-negative-positive three
The drain electrode of the grid of pole pipe and first NPN type triode, the 4th pin and the 8th pin are grounded；
Wherein, the first node is located between the negative pole of first LED load and the annex of the 4th LED load
Connection on, the Section Point be located at second LED load negative pole and the 3rd LED load positive pole between company
Connect.
In one embodiment, the drain electrode of the positive-negative-positive triode is connected to power supply, the source electrode of the PNP type triode and
The grid of first NPN type triode is connected to the grid of second NPN type triode, and, first NPN type
The source electrode of triode is grounded；The source electrode of second NPN type triode is grounded.
In another embodiment, the logic latching circuit also includes：It is connected to the grid of the PNP type triode and described
Resistance R10 between the drain electrode of first NPN type triode, is connected to the source electrode and first NPN type of the PNP type triode
Resistance R11 between the grid of triode.
In another embodiment, first pin and the 6th pin are connected to the second section by resistance R8
Point.
In another embodiment, the three-prong and the 7th pin are connected to the positive-negative-positive three by resistance R9
The drain electrode of the grid of pole pipe and first NPN type triode.
It should be understood that in the range of the utility model, above-mentioned each technical characteristic of the present utility model and below (as implemented
Example) in specifically describe each technical characteristic between can be combined with each other, so as to constitute new or preferred technical scheme.It is limited to
Length, no longer tires out state herein one by one.
Brief description of the drawings
Fig. 1 is the self-checking circuit for LED load drive system in one embodiment of the present utility model.
Fig. 2 is the circuit diagram of the signal acquisition circuit in one embodiment of the present utility model.
Embodiment
When there is short-circuit or open circuit failure in LED load drive system on automobile, it is common practice that keep system
This malfunction works on, and intuitively reflection is that occur that LED load is dimmed, do not light, and in subsequent vehicle startup
Meeting failure system can be started repeatedly.The utility model people develops a kind of for LED first by in-depth study extensively
The self-checking circuit of load driving system, it is therefore intended that be once short-circuited when LED load drive system, the failure such as short circuit, then from
Fault-signal can be locked within the extremely short time by logic latching circuit by examining circuit, to ensure that signal is not lost so as to avoid
System repeated priming in case of a fault, is then closed LED load drive system by logic execution circuit, until failure row
Except rear system just can normally start.
Term
As used herein, term " current-limiting resistance " refers to series connection in circuit, and connected component is burnt out to prevent electric current is excessive
Resistance.
Major advantage of the present utility model includes：1st, it can be checked before the startup of LED load drive system, if
The normal then whole LED illumination System of LED operation normally starts, and realizes the function of LED failure alarm.2nd, when LED occur short circuit,
LED load drive system can be locked during open circuit fault, until could normally start after failture evacuation, it is to avoid in follow-up driving
Security incident.3rd, it is capable of the connection of fast shut-off LED load drive system and automobile other systems, drastically increases automobile
Travel safety.
With reference to specific embodiment, the utility model is expanded on further.Although by referring to of the present utility model some
Preferred embodiment, is shown and described to the utility model, but it will be understood by those skilled in the art that
Can to it, various changes can be made in the form and details, without departing from spirit and scope of the present utility model.
It should be noted that in the claim and specification of this patent, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
There is any this actual relation or order between these entities or operation.Moreover, term " comprising ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of key elements or
Equipment not only includes those key elements, but also other key elements including being not expressly set out, or also include be this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions, by wanting that sentence " including one " is limited
Element, it is not excluded that also there is other identical element in the process including the key element, method, article or equipment.
Fig. 1 is the self-checking circuit for LED load drive system in one embodiment of the present utility model.Such as Fig. 1 institutes
Show, the self-checking circuit includes：LED load circuit, with LED6, LED7, LED8 and LED9, wherein LED6 positive pole and LED8
Positive pole is connected, and LED8 negative pole and LED9 positive pole are connected, and LED9 negative pole and LED7 negative pole are connected, LED7 positive pole with
LED6 negative pole connection, and there is first node between LED6 and LED7, there is Section Point between LED8 and LED9, own
LED load operating voltage be+3V；Signal acquisition circuit, with photoelectrical coupler U10 and U9, for detecting LED load electricity
The abnormal operating current and voltage on road；Logic latching circuit, with PNP type triode Q3 and NPN type triode Q1, for locking
Determine the fault-signal of LED load drive system；Logic execution circuit, with NPN type triode Q2, for being driven when LED load
System is short-circuited, open circuit when, close LED drive chip or switching LED drive chip to park mode.
Fig. 2 is the circuit diagram of the signal acquisition circuit in one embodiment of the present utility model.As shown in Fig. 2 signal is adopted
Collector has eight pins, is connected between LED load circuit and logic latching circuit, specifically：Photoelectrical coupler
U10 has first, second, third and fourth pin, and photoelectrical coupler U9 has the five, the six, the 7th and the 8th pin；
The positive pole of wherein the first pin connection photoelectrical coupler U10 light emitting diode；Second pin connection photoelectrical coupler U10 hair
The negative pole of optical diode；The drain electrode of three-prong connection photoelectrical coupler U10 phototriode；4th pin connects photoelectricity coupling
The source electrode of clutch U10 phototriode；The positive pole of 5th pin connection photoelectrical coupler U9 light emitting diode；6th pin
Connect the negative pole of photoelectrical coupler U9 light emitting diode；The leakage of 7th pin connection photoelectrical coupler U9 phototriode
Pole；The source electrode of 8th pin connection photoelectrical coupler U9 phototriode；Further, with reference to Fig. 1 and Fig. 2, the first pin
Section Point is connected to the 6th pin, the second pin and the 5th pin are connected to first node；Three-prong and the 7th
Pin is connected to the drain electrode of PNP type triode Q3 grid and NPN type triode Q1, and the 4th pin and the 8th pin are connect
Ground.
In the present embodiment, positive-negative-positive triode Q3 drain electrode is connected to power supply VIN, triode Q3 source electrode and NPN type
Triode Q1 grid is connected to NPN type triode Q2 grid, and NPN type triode Q1 source electrode is grounded；The pole of NPN type three
Pipe Q2 drain electrode is connected to IC switch control terminals, and NPN type triode Q2 source electrode is grounded.
In the present embodiment, the first pin and the 6th pin are connected to Section Point by current-limiting resistance R8, when any
When open circuit occurs in one LED load, voltage drop can increase suddenly in LED load circuit, and electric current is reduced to 0, and resistance R8 can share
Short-circuit voltage, it is to avoid photoelectrical coupler U10 and U9 light-emitting diodes tube voltage are excessive impaired.
Still in the present embodiment, three-prong and the 7th pin are connected to PNP type triode by current-limiting resistance R9
The drain electrode of Q3 grid and NPN type triode Q1, resistance R9 plays a part of protection triode Q3 and Q1；In addition, logic self-locking
Circuit also includes resistance R10, R11, R12, R14 and R15, as shown in figure 1, resistance R14 is connected on power supply VIN and triode Q3
Grid between, resistance R10 is connected between triode Q3 grid and triode Q1 drain electrode, and resistance R11 is connected
Between triode Q3 source electrode and triode Q1 grid, resistance R15 is connected between triode Q1 grid and source electrode, electricity
Resistance R12 is then connected between triode Q3 source electrode and triode Q2 grid.In one embodiment, R8, R9, R10,
R11, R12 resistance value can be 222 Ω, and R14, R15 resistance value can be 10k Ω.
In the present embodiment, first node and Section Point voltage are equal to 0V under normal circumstances.When in LED load circuit
When short trouble occurs in what LED load, more than 1V failure voltage signal can be produced between first node and Section Point,
The failure voltage signal is input into signal acquisition circuit so that photoelectrical coupler is turned on, and produces low level latch signal.
In the present embodiment, first node and Section Point voltage are equal to 0V under normal circumstances.When in LED load circuit
When open circuit fault occurs in what LED load, more than 1V failure voltage signal can be produced between first node and Section Point,
The failure voltage signal is input into signal acquisition circuit so that photoelectrical coupler is turned on, and produces low level latch signal.
In the present embodiment, logic latching circuit low level is latch signal, and the latch signal is input into logic self-locking
Circuit so that logic latching circuit locks the fault-signal in the signal of the signal acquisition circuit collection, until the LED is negative
Untill load drive system is de-energized；Logic execution circuit receives the fault-signal of the locking of the logic latching circuit, Ran Houguan
Close LED chip or be switched to park mode, then need after power-off fixes a breakdown, could normally start LED load driving
System, it is ensured that traffic safety of the vehicle under system fault condition.
In addition, it is to be understood that after above-mentioned instruction content of the present utility model has been read, those skilled in the art can be right
The utility model makes various changes or modifications, and these equivalent form of values equally fall within the model that the application appended claims are limited
Enclose.
Claims (9)
1. a kind of self-checking circuit for LED load drive system, it is characterised in that including：
LED load circuit；
Signal acquisition circuit, with the first photoelectrical coupler and the second photoelectrical coupler, for detecting the LED load circuit
Fault-signal；
Logic latching circuit, with PNP type triode and the first NPN type triode, for locking the fault-signal；With
Logic execution circuit, with the second NPN type triode, for receiving the fault-signal, and closes LED drive chip
Or switch the LED drive chip to park mode.
2. it is used for the self-checking circuit of LED load drive system as claimed in claim 1, it is characterised in that the LED load electricity
Road includes：The positive pole of first LED load is connected with the positive pole of the second LED load, the negative pole and the 3rd of second LED load
The positive pole connection of LED load, the negative pole of the 3rd LED load is connected with the negative pole of the 4th LED load, and the 4th LED is born
The positive pole of load is connected with the negative pole of first LED load.
3. it is used for the self-checking circuit of LED load drive system as claimed in claim 2, it is characterised in that first photoelectricity
Coupler has first, second, third and fourth pin, and second photoelectrical coupler has the five, the six, the 7th and
8th pin；
Wherein, first pin connects the positive pole of the light emitting diode of first photoelectrical coupler；Second pin connects
Connect the negative pole of the light emitting diode of first photoelectrical coupler；The three-prong connects the light of first photoelectrical coupler
The drain electrode of quick triode；4th pin connects the source electrode of the phototriode of first photoelectrical coupler；Described 5th
Pin connects the positive pole of the light emitting diode of second photoelectrical coupler；6th pin connects second photoelectric coupling
The negative pole of the light emitting diode of device；7th pin connects the drain electrode of the phototriode of second photoelectrical coupler；Institute
State the source electrode that the 8th pin connects the phototriode of second photoelectrical coupler.
4. it is used for the self-checking circuit of LED load drive system as claimed in claim 3, it is characterised in that first pin
Section Point is connected to the 6th pin, second pin and the 5th pin are connected to first node；With
And, the three-prong and the 7th pin are connected to the grid of the PNP type triode and the pole of the first NPN type three
The drain electrode of pipe, the 4th pin and the 8th pin are grounded；
Wherein, the first node is located between the negative pole of first LED load and the positive pole of the 4th LED load, institute
Section Point is stated between the negative pole of second LED load and the positive pole of the 3rd LED load.
5. it is used for the self-checking circuit of LED load drive system as claimed in claim 1, it is characterised in that the positive-negative-positive three-level
The drain electrode of pipe is connected to power supply, and the grid of the source electrode of the PNP type triode and first NPN type triode is connected to
The grid of second NPN type triode, and, the source electrode of first NPN type triode is grounded.
6. it is used for the self-checking circuit of LED load drive system as claimed in claim 1, it is characterised in that second NPN type
The source electrode of triode is grounded.
7. it is used for the self-checking circuit of LED load drive system as claimed in claim 4, it is characterised in that first pin
The Section Point is connected to by resistance R8 with the 6th pin.
8. it is used for the self-checking circuit of LED load drive system as claimed in claim 4, it is characterised in that the three-prong
The grid and first NPN type triode of the PNP type triode are connected to by resistance R9 with the 7th pin
Drain electrode.
9. it is used for the self-checking circuit of LED load drive system as claimed in claim 1, it is characterised in that the logic self-locking
Circuit also includes：It is connected to the resistance between the drain electrode of the grid of the PNP type triode and first NPN type triode
R10, is connected to the resistance R11 between the grid of the source electrode of the PNP type triode and first NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621214191.2U CN206341447U (en) | 2016-11-10 | 2016-11-10 | Self-checking circuit for LED load drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621214191.2U CN206341447U (en) | 2016-11-10 | 2016-11-10 | Self-checking circuit for LED load drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206341447U true CN206341447U (en) | 2017-07-18 |
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ID=59300344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621214191.2U Active CN206341447U (en) | 2016-11-10 | 2016-11-10 | Self-checking circuit for LED load drive system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454715A (en) * | 2017-08-04 | 2017-12-08 | 久心医疗科技（苏州）有限公司 | LED self-checking circuits and method for automated external defibrillator |
| CN107949119A (en) * | 2017-12-28 | 2018-04-20 | 广州爱易学智能信息科技有限公司 | Classroom blackboard LED light strip drive circuit |
| CN115811237A (en) * | 2023-01-17 | 2023-03-17 | 长城电源技术有限公司 | Synchronous rectification control circuit and control method |
| CN116027194A (en) * | 2023-03-29 | 2023-04-28 | 河北水利电力学院 | Motor fault monitoring system |
| CN117479383A (en) * | 2023-11-17 | 2024-01-30 | 上海衡亮电子科技股份有限公司 | Circuit for automatically eliminating leakage of failed LED lamp beads |
-
2016
- 2016-11-10 CN CN201621214191.2U patent/CN206341447U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107454715A (en) * | 2017-08-04 | 2017-12-08 | 久心医疗科技（苏州）有限公司 | LED self-checking circuits and method for automated external defibrillator |
| CN107949119A (en) * | 2017-12-28 | 2018-04-20 | 广州爱易学智能信息科技有限公司 | Classroom blackboard LED light strip drive circuit |
| CN115811237A (en) * | 2023-01-17 | 2023-03-17 | 长城电源技术有限公司 | Synchronous rectification control circuit and control method |
| CN116027194A (en) * | 2023-03-29 | 2023-04-28 | 河北水利电力学院 | Motor fault monitoring system |
| CN117479383A (en) * | 2023-11-17 | 2024-01-30 | 上海衡亮电子科技股份有限公司 | Circuit for automatically eliminating leakage of failed LED lamp beads |
| CN117479383B (en) * | 2023-11-17 | 2024-06-18 | 上海衡亮电子科技股份有限公司 | Circuit for automatically eliminating leakage of failed LED lamp beads |
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