CN108174488A - A kind of LED protection circuit - Google Patents
A kind of LED protection circuit Download PDFInfo
- Publication number
- CN108174488A CN108174488A CN201810048095.2A CN201810048095A CN108174488A CN 108174488 A CN108174488 A CN 108174488A CN 201810048095 A CN201810048095 A CN 201810048095A CN 108174488 A CN108174488 A CN 108174488A
- Authority
- CN
- China
- Prior art keywords
- field
- effect tube
- led
- circuit
- current source
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED protection circuit, including：LED drive circuit, comparison circuit, filter delay circuit, guard mode detection circuit and reference circuit；Wherein, the LED drive circuit is used to provide driving current for LED；The reference circuit is used to provide reference voltage；The comparison circuit is for the reference voltage and the cathode voltage of the LED；The level signal that the filter delay circuit is used to export the comparison circuit is filtered；The guard mode detection circuit is used to detect the working condition of the LED.The LED protection circuit has many advantages, such as that circuit structure is simple, dependable performance, it is at low cost, triggering after can with detection circuit state, have short trouble releasing after restore automatically.
Description
Technical field
The present invention relates to power protecting circuit technical field, more specifically more particularly to a kind of LED protection circuit.
Background technology
With the continuous development of science and technology, various electronic equipments be widely used to daily life with
And in work, bring great convenience for people’s lives and work.
LED constant current source (leakage) driving circuit due to simple in structure, extensively should by the advantages that peripheral components are few and at low cost
With based on portable equipment camera, as requirement of the user to its portable equipment camera is continuously improved, LED drive chip
Driving current is also increasing therewith, in order to prevent LED lamp bead short circuit and the problem of chip is caused to burn, need in chip
Interior addition short-circuit protection circuit is necessary.
But traditional protection circuit is complicated, component number is more and cost is higher.
So, how to provide a kind of circuit simple and at low cost LED protection circuit structure, be those skilled in the art urgently
Problem to be solved.
Invention content
To solve the above problems, the present invention provides a kind of LED protection circuit, which has circuit structure letter
It is single, after dependable performance, at low cost, triggering can with detection circuit state, have the advantages that restoring automatically after short trouble releasing.
To achieve the above object, the present invention provides following technical solution：
A kind of LED protection circuit, the LED protection circuit include：LED drive circuit, comparison circuit, filtering delay-time electricity
Road, guard mode detection circuit and reference circuit；
Wherein, the LED drive circuit is used to provide driving current for LED；The reference circuit is electric for providing benchmark
Pressure；The comparison circuit is for the reference voltage and the cathode voltage of the LED；The filter delay circuit for pair
The level signal of the comparison circuit output is filtered；The guard mode detection circuit is used to detect the LED's
Working condition.
Preferably, in above-mentioned LED protection circuit, the LED drive circuit includes：First controllable current source, LED,
One field-effect tube and the second field-effect tube；
Wherein, one end of first controllable current source is connect with the voltage input end of the LED protection circuit, and described
The other end of one controllable current source is connect with the drain electrode of first field-effect tube, and the source electrode ground connection of first field-effect tube connects
It connects, the grid of first field-effect tube is connect with the grid of second field-effect tube, the grid of first field-effect tube
Drain electrode with first field-effect tube is connect, the source electrode grounding connection of second field-effect tube, second field-effect tube
Drain electrode connect with the cathode of the LED, the anode of the LED is connect with the voltage input end.
Preferably, in above-mentioned LED protection circuit, the LED drive circuit further includes：Third field-effect tube；
Wherein, the source electrode grounding connection of the third field-effect tube, the drain electrode of the third field-effect tube and described first
The grid of field-effect tube is connected with the connecting node of the grid of second field-effect tube, the grid of the third field-effect tube with
The voltage output end connection of the LED protection circuit.
Preferably, in above-mentioned LED protection circuit, the reference circuit includes：First resistor, the second controllable current source,
4th field-effect tube and third controllable current source；
Wherein, one end of the first resistor is connect with the voltage input end, the other end of the first resistor and institute
State one end connection of the second controllable current source, the other end grounding connection of second controllable current source, the 4th field-effect
The drain electrode of pipe is connect with the connecting node of the first resistor and second controllable current source, the source of the 4th field-effect tube
Pole passes through the third controllable current source grounding connection, the grid of the 4th field-effect tube and the electricity of the LED protection circuit
Press output terminal connection.
Preferably, in above-mentioned LED protection circuit, the comparison circuit includes：Comparator；
Wherein, the drain electrode of the cathode and second field-effect tube of the inverting input of the comparator and the LED
Connecting node connects, the normal phase input end of the comparator and the first resistor and the connection section of second controllable current source
Point connection, the output terminal of the comparator are connect with the filter delay circuit.
Preferably, in above-mentioned LED protection circuit, the filter delay circuit includes：5th field-effect tube, the 6th effect
Ying Guan, the 4th controllable current source, the 5th controllable current source, capacitance, Schmidt's device and phase inverter；
Wherein, the source electrode of the 5th field-effect tube is connected by the 4th controllable current source and the voltage input end
It connects, the grid of the 5th field-effect tube is connect with the grid of the 6th field-effect tube, the output terminal of the comparator and institute
The grid for stating the 5th field-effect tube is connected with the connecting node of the grid of the 6th field-effect tube, the 5th field-effect tube
Drain electrode is connect with the drain electrode of the 6th field-effect tube, and the source electrode of the 6th field-effect tube passes through the 5th controllable current source
Grounding connection, one end of the capacitance and the drain electrode of the 5th field-effect tube and the connection of the drain electrode of the 6th field-effect tube
Node connects, the other end grounding connection of the capacitance, one end of Schmidt's device and the drain electrode of the 5th field-effect tube
It is connected with the connecting node of the drain electrode of the 6th field-effect tube, the other end of Schmidt's device and one end of the phase inverter
Connection, the other end of the phase inverter are connect with the voltage output end.
Preferably, in above-mentioned LED protection circuit, the guard mode detection circuit includes：7th field-effect tube and
6th controllable current source；
Wherein, the drain electrode of the 7th field-effect tube and the drain electrode of the cathode of the LED and second field-effect tube
Connecting node connects, and the source electrode of the 7th field-effect tube is by the 6th controllable current source grounding connection, described 7th
The grid of effect pipe is connect with the voltage output end of the LED protection circuit.
By foregoing description it is found that a kind of LED protection circuit provided by the invention includes：LED drive circuit, comparison are electric
Road, filter delay circuit, guard mode detection circuit and reference circuit；Wherein, the LED drive circuit is used to carry for LED
For driving current；The reference circuit is used to provide reference voltage；The comparison circuit is used for the reference voltage and institute
State the cathode voltage of LED；The level signal that the filter delay circuit is used to export the comparison circuit is filtered；
The guard mode detection circuit is used to detect the working condition of the LED.
The LED protection circuit have circuit structure it is simple, dependable performance, it is at low cost, triggering after can with detection circuit state,
Has the advantages that restoring automatically after short trouble releases.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structure diagram of LED protection circuit provided in an embodiment of the present invention；
Fig. 2 is the structure diagram of another LED protection circuit provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
With reference to figure 1, Fig. 1 is a kind of structure diagram of LED protection circuit provided in an embodiment of the present invention.
The LED protection circuit includes：LED drive circuit 1, comparison circuit 4, filter delay circuit 5, guard mode detection
Circuit 2 and reference circuit 3.
Wherein, the LED drive circuit 1 is used to provide driving current for LED；The reference circuit 3 is used to provide benchmark
Voltage；The comparison circuit 4 is for the reference voltage and the cathode voltage of the LED；The filter delay circuit 5 is used
It is filtered in the level signal exported to the comparison circuit 4；The guard mode detection circuit 2 is described for detecting
The working condition of LED.
Specifically, by directly detecting the magnitude relationship between LED cathode voltage and reference voltage, judged with this described
Whether LED occurs short circuit phenomenon, and by setting guard mode detection circuit, can detect the electricity of LED drive circuit in real time
The working condition of line state, i.e. LED, greatly reduces the scale of LED protection circuit, and increases the reliable of LED protection circuit
Property.
Further, as shown in Figure 1, the LED drive circuit 1 includes：First controllable current source I1, LED, first effect
It should pipe NM1 and the second field-effect tube NM2.
Wherein, one end of the first controllable current source I1 is connect with the voltage input end VDD of the LED protection circuit,
The other end of the first controllable current source I1 is connect with the drain electrode of the first field-effect tube NM1, first field-effect tube
The source electrode ground connection GND connections of NM1, the grid of the first field-effect tube NM1 and the grid of the second field-effect tube NM2 connect
It connects, the grid of the first field-effect tube NM1 is connect with the drain electrode NM1 of first field-effect tube, second field-effect tube
The source electrode ground connection GND connections of NM2, the drain electrode of the second field-effect tube NM2 are connect with the cathode of the LED, the sun of the LED
Pole is connect with the voltage input end VDD.
Specifically, the first controllable current source I1 can be any form of controllable current source, in the embodiment of the present invention
In and be not construed as limiting, the first field-effect tube NM1 and the second field-effect tube NM2 are N-type field-effect tube, described first
Effect pipe NM1 and the second field-effect tube NM2 composition current mirroring circuits, it is the first controllable current source I1, first described
The current circuit of effect pipe NM1 and the second field-effect tube NM2 compositions is constant-current drive circuit, for driving the LED
Light emitting diode.
Further, as shown in Fig. 2, the LED drive circuit 1 further includes：Third field-effect tube NM3.
Wherein, the third field-effect tube NM3 source electrode ground connection GND connections, the drain electrode of the third field-effect tube NM3 and
The grid of the first field-effect tube NM1 is connected with the connecting node of the grid of the second field-effect tube NM2, the third field
The grid of effect pipe NM3 is connect with the voltage output end VSP of the LED protection circuit.
Specifically, the third field-effect tube NM3 is N-type field-effect tube, it is the enabled control electricity of the LED drive circuit
Road, for LED drive circuit described on and off.When the third field-effect tube NM3 is connected, first field-effect tube
The grid voltage of the grid voltage of NM1 and the second field-effect tube NM2 are pulled low, the first field-effect tube NM1 and institute
It states the second field-effect tube NM2 and is in closed state；When the third field-effect tube NM3 is closed, first field-effect tube
NM1 and the second field-effect tube NM2 are in the conduction state；That is, when the LED short circuits, the third field is controlled
Effect pipe NM3 is connected, so that the first field-effect tube NM1 and the second field-effect tube NM2 is closed, and then in LED short circuits
In the case of protect other circuit structures.
Further, as shown in Figure 1, the reference circuit 3 includes：First resistor R1, the second controllable current source I2, the 4th
Field-effect tube NM4 and third controllable current source I3.
Wherein, one end of the first resistor R1 is connect with the voltage input end VDD, and the first resistor R1's is another
End is connect with one end of the second controllable current source I2, the other end ground connection GND connections of the second controllable current source I2, institute
The drain electrode for stating the 4th field-effect tube NM4 is connect with the connecting node of the first resistor R1 and the second controllable current source I2,
The source electrode of the 4th field-effect tube NM4 is grounded GND connections, the 4th field-effect tube by the third controllable current source I3
The grid of NM4 is connect with the voltage output end VSP of the LED protection circuit.
Specifically, the second controllable current source I2 and third controllable current source I3 can be any form of controllable
Current source in embodiments of the present invention and is not construed as limiting, and the 4th field-effect tube NM4 is N-type field-effect tube, first electricity
For resistance R1 and the second controllable current source I2 for generating fixed pressure drop, the 4th field-effect tube NM4 and the third are controllable
Current source I3 is for generating retarding window voltage, for providing reference voltage for the comparison circuit 4.
Further, as shown in Figure 1, the comparison circuit 4 includes：Comparator COMP.
Wherein, the inverting input of the comparator COMP and the cathode of the LED and the second field-effect tube NM2
The connecting node connection of drain electrode, the normal phase input end of the comparator COMP and the first resistor R1 and second controllable electric
The connecting node connection of stream source I2, the COMP output terminals of the comparator are connect with the filter delay circuit 5.
Specifically, the magnitude relationship between cathode voltage and reference voltage by detecting the LED, is judged described with this
Whether LED occurs short circuit phenomenon, when entirely protection circuit be not turned on when, comparator COMP be enabled signal EN_SP closing, institute
There is controllable current source to be closed, both prevent false triggering, while also reduce static power consumption.
Further, as shown in Figure 1, the filter delay circuit 5 includes：5th field-effect tube PM1, the 6th field-effect tube
NM5, the 4th controllable current source I4, the 5th controllable current source I5, capacitance C, Schmidt's device Schmitt and phase inverter INV1.
Wherein, the source electrode of the 5th field-effect tube PM1 passes through the 4th controllable current source I4 and the control source
VDD connections are held, the grid of the 5th field-effect tube PM1 is connect with the grid of the 6th field-effect tube NM5, the comparator
The connecting node of the output terminal of COMP and the grid of the 5th field-effect tube PM1 and the grid of the 6th field-effect tube NM5
Connection, the drain electrode of the 5th field-effect tube PM1 are connect with the drain electrode of the 6th field-effect tube NM5, the 6th field-effect
The source electrode of pipe NM5 is grounded GND connections, one end of the capacitance C and described 5th effect by the 5th controllable current source I5
Should the drain electrode of pipe PM1 connected with the connecting node of the drain electrode of the 6th field-effect tube NM5, the other end ground connection of the capacitance C
GND connections, one end of Schmidt's device Schmitt and the drain electrode of the 5th field-effect tube PM1 and the 6th field-effect
The connecting node connection of the drain electrode of pipe NM5, the other end of Schmidt's device Schmitt connect with one end of the phase inverter INV1
It connects, the other end of the phase inverter INV1 is connect with the voltage output end VSP.
Specifically, the 4th controllable current source I4 and the 5th controllable current source I5 can be any form of controllable
Current source in embodiments of the present invention and is not construed as limiting, the 5th field-effect tube PM1 be p-type field-effect tube, described 6th
Effect pipe NM5 is N-type field-effect tube, and the filter delay circuit 5 is mainly used for filtering out " burr " letter of the output of comparison circuit 4
Number, to prevent from leading to the problem of raising of LED cathode voltage instantaneous is so as to trigger protection circuit due to extraneous factor.
Further, as shown in Figure 1, the guard mode detection circuit 2 includes：7th field-effect tube NM6 and the 6th
Controllable current source I6.
Wherein, the drain electrode of the 7th field-effect tube NM6 and the cathode of the LED and the second field-effect tube NM2
The connecting node connection of drain electrode, the source electrode of the 7th field-effect tube NM6 by the 6th controllable current source I6 grounding connections,
The grid of the 7th field-effect tube NM6 is connect with the voltage output end VSP of the LED protection circuit.
Specifically, the 6th controllable current source I6 can be any form of controllable current source, in the embodiment of the present invention
In and be not construed as limiting, the 7th field-effect tube NM6 is N-type field-effect tube, and the guard mode detection circuit detects LED in real time
The working condition of the circuit state of driving circuit, i.e. LED, after the short trouble of LED is eliminated, which can generate on LED
Sufficiently large pressure drop exits short-circuit protection for next step and provides foundation.
The concrete principle of the LED protection circuit is described below.
As shown in Fig. 2, when LED has electric current to flow through, LED can generate pressure drop in itself, and size is expressed as VLED, thus institute
State the voltage VN=VDD-VLED of the inverting input of comparator, the reference voltage that the reference circuit generates for VDD-I2 ×
R1, i.e., voltage VP=VDD-I2 × R1 of the normal phase input end of described comparator, when LED short circuits, VLED 0, i.e. VN=VDD
＞ VP=VDD-I2 × R1, comparator are overturn, and after filter delay circuit processing, export high level, and at this time the
Four field-effect tube NM4 are connected, then reference voltage variation is VDD- (I2+I3) × R1.
That is, after the LED protection circuit is triggered, since reference voltage V DD-I2 × R1 and VDD relatively connect
Closely, then by setting the 4th field-effect tube NM4 and third controllable current source I3, its reference voltage is made to be reduced to VDD- again
(I2+I3) × R1 generates oscillation to prevent protection circuit because extraneous factor.
As shown in Fig. 2, after the LED protection circuit is triggered, the voltage output end VSP of the LED protections voltage is defeated
Go out high level, the 7th field-effect tube NM6 conductings, the 6th controllable current source I6 is opened, for monitoring LED's in real time
State, if after short trouble is released from, the voltage VN of the inverting input of the comparator is decreased below the comparator
Normal phase input end voltage VP, at this time the 7th field-effect tube NM6 close, the 6th controllable current source I6 is closed automatically
It closes.
As shown in Fig. 2, after the LED protection circuit is triggered, the third field-effect tube NM3 conductings, so it is described
First field-effect tube NM1 and the second field-effect tube NM2 is closed, for protecting other circuit knots in the case of LED short circuits
Structure.
It follows that the protection circuit is by directly detecting the magnitude relationship between LED cathode voltage and reference voltage, with
This judges whether the LED occurs short circuit phenomenon, and by setting guard mode detection circuit, can detect LED drives in real time
The circuit state of dynamic circuit, the i.e. working condition of LED, greatly reduce the scale of LED protection circuit, and increase LED protections
The reliability of circuit, and after trouble shooting, LED guard modes can automatically terminate.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (7)
1. a kind of LED protection circuit, which is characterized in that the LED protection circuit includes：LED drive circuit, comparison circuit, filter
Wave delay circuit, guard mode detection circuit and reference circuit；
Wherein, the LED drive circuit is used to provide driving current for LED；The reference circuit is used to provide reference voltage；Institute
Comparison circuit is stated for the reference voltage and the cathode voltage of the LED；The filter delay circuit is used for described
The level signal of comparison circuit output is filtered；The guard mode detection circuit is used to detect the work of the LED
State.
2. LED protection circuit according to claim 1, which is characterized in that the LED drive circuit includes：First is controllable
Current source, LED, the first field-effect tube and the second field-effect tube；
Wherein, one end of first controllable current source is connect with the voltage input end of the LED protection circuit, and described first can
The other end of control current source is connect with the drain electrode of first field-effect tube, the source electrode grounding connection of first field-effect tube,
The grid of first field-effect tube is connect with the grid of second field-effect tube, the grid of first field-effect tube and institute
State the drain electrode connection of the first field-effect tube, the source electrode grounding connection of second field-effect tube, the leakage of second field-effect tube
Pole is connect with the cathode of the LED, and the anode of the LED is connect with the voltage input end.
3. LED protection circuit according to claim 2, which is characterized in that the LED drive circuit further includes：Third field
Effect pipe；
Wherein, the source electrode grounding connection of the third field-effect tube, the drain electrode of the third field-effect tube and described first effect
Should the grid of pipe connected with the connecting node of the grid of second field-effect tube, the grid of the third field-effect tube with it is described
The voltage output end connection of LED protection circuit.
4. LED protection circuit according to claim 2, which is characterized in that the reference circuit includes：First resistor,
Two controllable current sources, the 4th field-effect tube and third controllable current source；
Wherein, one end of the first resistor is connect with the voltage input end, the other end of the first resistor and described the
One end connection of two controllable current sources, the other end grounding connection of second controllable current source, the 4th field-effect tube
Drain electrode is connect with the connecting node of the first resistor and second controllable current source, and the source electrode of the 4th field-effect tube leads to
The third controllable current source grounding connection is crossed, the grid and the voltage of the LED protection circuit of the 4th field-effect tube are defeated
Outlet connects.
5. LED protection circuit according to claim 4, which is characterized in that the comparison circuit includes：Comparator；
Wherein, the inverting input of the comparator and the cathode of the LED and the connection of the drain electrode of second field-effect tube
Node connects, and the normal phase input end of the comparator connects with the first resistor and the connecting node of second controllable current source
It connects, the output terminal of the comparator is connect with the filter delay circuit.
6. LED protection circuit according to claim 5, which is characterized in that the filter delay circuit includes：5th effect
Ying Guan, the 6th field-effect tube, the 4th controllable current source, the 5th controllable current source, capacitance, Schmidt's device and phase inverter；
Wherein, the source electrode of the 5th field-effect tube is connect by the 4th controllable current source with the voltage input end, institute
The grid for stating the 5th field-effect tube is connect with the grid of the 6th field-effect tube, the output terminal of the comparator and the described 5th
The grid of field-effect tube is connected with the connecting node of the grid of the 6th field-effect tube, the drain electrode of the 5th field-effect tube with
The drain electrode connection of 6th field-effect tube, the source electrode of the 6th field-effect tube is grounded by the 5th controllable current source to be connected
It connects, one end of the capacitance and the connecting node of the drain electrode of the 5th field-effect tube and the drain electrode of the 6th field-effect tube connect
It connects, the other end grounding connection of the capacitance, the drain electrode of one end of Schmidt's device and the 5th field-effect tube and described
The connecting node connection of the drain electrode of 6th field-effect tube, the other end of Schmidt's device are connect with one end of the phase inverter,
The other end of the phase inverter is connect with the voltage output end.
7. LED protection circuit according to claim 2, which is characterized in that the guard mode detection circuit includes：7th
Field-effect tube and the 6th controllable current source；
Wherein, the connection to drain with the cathode of the LED and the drain electrode of second field-effect tube of the 7th field-effect tube
Node connects, and the source electrode of the 7th field-effect tube passes through the 6th controllable current source grounding connection, the 7th field-effect
The grid of pipe is connect with the voltage output end of the LED protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048095.2A CN108174488B (en) | 2018-01-18 | 2018-01-18 | LED protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048095.2A CN108174488B (en) | 2018-01-18 | 2018-01-18 | LED protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108174488A true CN108174488A (en) | 2018-06-15 |
| CN108174488B CN108174488B (en) | 2020-03-10 |
Family
ID=62514794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810048095.2A Active CN108174488B (en) | 2018-01-18 | 2018-01-18 | LED protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108174488B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109152156A (en) * | 2018-10-23 | 2019-01-04 | 上海艾为电子技术股份有限公司 | A kind of constant current source driving circuit |
| CN111641187A (en) * | 2020-06-12 | 2020-09-08 | 上海艾为电子技术股份有限公司 | Overcurrent protection circuit, overcurrent protection method and electronic equipment |
| CN112498272A (en) * | 2020-11-26 | 2021-03-16 | 惠州市德赛西威汽车电子股份有限公司 | Alarm lamp diagnostic circuit and automobile instrument |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708786A (en) * | 2011-08-25 | 2012-10-03 | 京东方科技集团股份有限公司 | Active matrix organic light emitting diode (AMOLED) pixel unit driving circuit and method, pixel unit and display device |
| CN103150983A (en) * | 2011-12-07 | 2013-06-12 | 美格纳半导体有限公司 | Detecting circuit for short of LED array and LED driving apparatus |
| CN103260323A (en) * | 2012-02-15 | 2013-08-21 | 通嘉科技股份有限公司 | Power supply control circuit, short circuit detection circuit and control method |
| CN203675408U (en) * | 2014-01-30 | 2014-06-25 | 杰华特微电子（杭州）有限公司 | Short-circuit protection circuit for LED lighting device |
| CN106550508A (en) * | 2016-10-31 | 2017-03-29 | 北京集创北方科技股份有限公司 | LED drive device and control method and its protection circuit and control method |
-
2018
- 2018-01-18 CN CN201810048095.2A patent/CN108174488B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708786A (en) * | 2011-08-25 | 2012-10-03 | 京东方科技集团股份有限公司 | Active matrix organic light emitting diode (AMOLED) pixel unit driving circuit and method, pixel unit and display device |
| CN103150983A (en) * | 2011-12-07 | 2013-06-12 | 美格纳半导体有限公司 | Detecting circuit for short of LED array and LED driving apparatus |
| CN103260323A (en) * | 2012-02-15 | 2013-08-21 | 通嘉科技股份有限公司 | Power supply control circuit, short circuit detection circuit and control method |
| CN203675408U (en) * | 2014-01-30 | 2014-06-25 | 杰华特微电子（杭州）有限公司 | Short-circuit protection circuit for LED lighting device |
| CN106550508A (en) * | 2016-10-31 | 2017-03-29 | 北京集创北方科技股份有限公司 | LED drive device and control method and its protection circuit and control method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109152156A (en) * | 2018-10-23 | 2019-01-04 | 上海艾为电子技术股份有限公司 | A kind of constant current source driving circuit |
| CN109152156B (en) * | 2018-10-23 | 2024-02-02 | 上海艾为电子技术股份有限公司 | Constant current source driving circuit |
| CN111641187A (en) * | 2020-06-12 | 2020-09-08 | 上海艾为电子技术股份有限公司 | Overcurrent protection circuit, overcurrent protection method and electronic equipment |
| CN111641187B (en) * | 2020-06-12 | 2022-08-19 | 上海艾为电子技术股份有限公司 | Overcurrent protection circuit, overcurrent protection method and electronic equipment |
| CN112498272A (en) * | 2020-11-26 | 2021-03-16 | 惠州市德赛西威汽车电子股份有限公司 | Alarm lamp diagnostic circuit and automobile instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108174488B (en) | 2020-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108174488A (en) | A kind of LED protection circuit | |
| WO2018000907A1 (en) | Noise generation circuit, self-test circuit, afci and photovoltaic power generation system | |
| CN108650764A (en) | Switch detection circuit and lamps and lanterns | |
| CN206742952U (en) | LED emergency power supplies are met an urgent need switching circuit | |
| CN207117164U (en) | The power protecting circuit and display device of a kind of display device | |
| CN204046874U (en) | A kind of Novel LED light | |
| CN106550508B (en) | LED drive device and control method and its protection circuit and control method | |
| CN208353214U (en) | Control loop soft start circuit | |
| CN204929332U (en) | LED light of safety and stability | |
| CN102931631B (en) | Output earth leakage protection device for high-voltage and direct-current power supply system | |
| CN108768150A (en) | A kind of quick discharging circuit and device | |
| CN201590934U (en) | Ultraviolet lamp failure detection circuit and device | |
| CN204465948U (en) | Multifunctional LED power supply | |
| CN209250236U (en) | Surge protection circuit, circuit system and electronic equipment | |
| CN105403756A (en) | Circuit device having ground wire live detection function | |
| CN208046223U (en) | DC power supply and its output protection circuit | |
| CN207560239U (en) | Power failure detection reset circuit and liquid crystal television | |
| CN201490709U (en) | Anti-dead halt lightning arrester | |
| CN207896665U (en) | Meet storage battery power supply voltage instability and protects the protective device of LCD screen | |
| CN201813358U (en) | Electronic switch with fire protection urgent control function | |
| CN105785141A (en) | Three-phase power supply phase sequence and default phase detecting circuit for electric actuating mechanism | |
| CN206114814U (en) | Short -circuit fault detection circuitry of low internal resistance load | |
| CN208386134U (en) | A kind of hardware current-limiting protection circuit of motor | |
| CN204835504U (en) | Monitoring type quick -break protection's three -terminal constant voltage power supply | |
| CN203551689U (en) | A current surge protector piezoresistor deterioration early warning circuit and an apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 201199 Room 1201, Lane 908, Xiuwen Road, Minhang District, Shanghai Patentee after: Shanghai Awinic Technology Co.,Ltd. Address before: Room 303-39, 33 Block 680 Guiping Road, Xuhui District, Shanghai, 2003 Patentee before: Shanghai Awinic Technology Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder |