CN206559686U - A kind of lamp bar overheating protection circuit and display device - Google Patents
A kind of lamp bar overheating protection circuit and display device Download PDFInfo
- Publication number
- CN206559686U CN206559686U CN201720136281.2U CN201720136281U CN206559686U CN 206559686 U CN206559686 U CN 206559686U CN 201720136281 U CN201720136281 U CN 201720136281U CN 206559686 U CN206559686 U CN 206559686U
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- Prior art keywords
- led light
- light bar
- lamp bar
- module
- temperature
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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]
Abstract
The utility model discloses a kind of lamp bar overheating protection circuit and display device, wherein, the lamp bar overheating protection circuit includes several LED light bars, boost module and temperature protection module, the DC voltage of input is subjected to boosting processing by boost module, output presets operating voltage to each LED light bar, the temperature protection module is mounted in the LED light bar and is connected between the LED light bar and boost module, the temperature protection module controls the current path of the LED light bar to disconnect when the operating temperature of LED light bar is more than preset temperature, the current path of lamp bar can be disconnected in time when lamp bar operating temperature is too high, avoid due to the radiating loose contact that overlong time is caused, and then LED light bar heat dispersion is declined the problem of causing overheat hidden danger.
Description
Technical field
The utility model is related to display device technical field, and more particularly to a kind of lamp bar overheating protection circuit and display are set
It is standby.
Background technology
LCD, without actively luminous function, can only passively light as display panel by other backlights.Now
LCD is mainly arranged on backboard radiator with LED light bar, provides light source to LCD, lamp bar is to be bonded at radiator by heat conduction viscose glue
On, longer working time be possible to depart from, cause area of dissipation loose contact, cause LED heat dispersions decline, lamp bead damage or
Burn, or even cause fire safety evaluating accident.
Thus prior art could be improved and improve.
Utility model content
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of lamp bar overtemperature protection electricity
Road and display device, the current path of lamp bar can be disconnected in time, it is to avoid because overlong time is made when lamp bar operating temperature is too high
Into radiating loose contact, and then make LED light bar heat dispersion decline cause overheat hidden danger the problem of.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of lamp bar overheating protection circuit, it includes several LED light bars, boost module and temperature protection module, by rising
The DC voltage of input is carried out boosting processing, the default operating voltage of output to each LED light bar, the temperature protection by die block
Module is mounted in the LED light bar and is connected between the LED light bar and boost module, and the temperature protection module exists
The operating temperature of LED light bar controls the current path of the LED light bar to disconnect when being more than preset temperature.
In described lamp bar overheating protection circuit, in addition to current detection module, when temperature protection module controls all LED
When the current path of lamp bar disconnects, current detection module output current cut-off signals to boost module close the boost module.
In described lamp bar overheating protection circuit, the boost module includes inductance, diode, metal-oxide-semiconductor, electric capacity and constant current
Control chip, one end connection DC+ DC terminals of the inductance, the other end of the inductance connects the positive pole and metal-oxide-semiconductor of diode
Drain electrode；The negative pole of the diode by capacity earth, be also connected with temperature protection module；The grid connection constant current of the metal-oxide-semiconductor
The Rv ends of control chip, the source ground of the metal-oxide-semiconductor.
In described lamp bar overheating protection circuit, it is corresponding with LED light bar that the temperature protection module includes several quantity
Thermal Cutoffs, each Thermal Cutoffs be connected on the diode negative pole and correspondence one LED light bar positive pole it
Between.
In described lamp bar overheating protection circuit, it is corresponding with LED light bar that the current detection module includes several quantity
Current sense resistor, each current sense resistor one end correspondence connection one LED light bar negative pole, all current detectings
The other end of resistance is all connected with the Vp ends of current constant control chip.
In described lamp bar overheating protection circuit, the Thermal Cutoffs is SMD Thermal Cutoffs.
In described lamp bar overheating protection circuit, the metal-oxide-semiconductor is N-channel MOS pipe.
In described lamp bar overheating protection circuit, the model OZ568GN of the current constant control chip.
A kind of display device, it includes lamp bar overheating protection circuit as described above.
In described display device, in addition to radiator, the LED light bar is pasted onto on the radiator.
In the lamp bar overheating protection circuit and display device that are provided compared to prior art, the utility model, the lamp bar
Overheating protection circuit includes several LED light bars, boost module and temperature protection module, by boost module by the direct current of input
Pressure carries out boosting processing, and the default operating voltage of output is to each LED light bar, and the temperature protection module is mounted on the LED
On bar and it is connected between the LED light bar and boost module, the temperature protection module is more than in the operating temperature of LED light bar
Control the current path of the LED light bar to disconnect during preset temperature, lamp bar can be disconnected in time when lamp bar operating temperature is too high
Current path, it is to avoid due to the radiating loose contact that overlong time is caused, and then the decline of LED light bar heat dispersion is caused overheat
The problem of hidden danger.
Brief description of the drawings
The circuit diagram for the lamp bar overheating protection circuit that Fig. 1 provides for the utility model.
Embodiment
The utility model provides a kind of lamp bar overheating protection circuit and display device, can when lamp bar operating temperature is too high and
When disconnect lamp bar current path, it is to avoid due to the radiating loose contact that overlong time is caused, and then make LED light bar heat dispersion
The problem of decline causes overheat hidden danger.
To make the purpose of this utility model, technical scheme and effect clearer, clear and definite, develop simultaneously implementation referring to the drawings
The utility model is further described example.It should be appreciated that specific embodiment described herein is only to explain this practicality
It is new, it is not used to limit the utility model.
Referring to Fig. 1, the lamp bar overheating protection circuit that the utility model is provided includes several LED light bars, boost module
10 and temperature protection module 20, wherein the quantity of the LED light bar can be provided as the backlight of display device according to actual needs
Source, the utility model is not restricted to this, in the present embodiment, is explained with two LED light bars, with the first LED in figure
The LED light bar 12 of lamp bar 11 and second is represented, it is apparent that the quantity not limited to this of the LED light bar.Wherein described boost module 10
Several LED light bars are connected by temperature protection module 20, the DC voltage of input is subjected to boosting processing by boost module 10,
The default operating voltage of output provides suitable operating voltage to each LED light bar, to each LED light bar and drives its normal work.
Preferably, the lamp bar that the utility model is provided is really in protection circuit, and the temperature protection module 20 is mounted on institute
State in LED light bar, and be connected between the LED light bar and boost module 10, when it is implemented, LED light bar is by several LED
Lamp bead is composed in series, and temperature protection module 20 is connected with LED lamp bead, and is attached in LED and is detected its operating temperature in real time,
When LED light bar operating temperature be more than preset temperature when control the current path of the LED light bar to disconnect, even LED light bar by
In the working time it is long cause to be deteriorated with the sticking effect of radiator cause poor heat radiation, now temperature protection module 20 can detect
The operating temperature of each LED light bar, disconnects automatically when the operating temperature of some LED light bar reaches default higher limit, this lamp
Bar no longer works, and eliminates the potential safety hazard brought because operating temperature is too high.
Further, the lamp bar overheating protection circuit also includes current detection module 30, the current detection module 30
The LED light bar and boost module 10 are connected, when temperature protection module 20 controls the current path of all LED light bars to disconnect,
The output current cut-off signals of current detection module 30 close the boost module 10, that is, pass through current detecting to boost module 10
The current information of the feedback LED string of module 30 to boost module 10, when all LED light bars all due to operating temperature is too high and
Under the control of temperature protection module 20 during turn-off current path, current detection module 30 now detects the electricity of all LED strings
Stream is zero, and now output current cut-off signals are to boost module 10, and control boost module 10 is closed so that whole backlight circuit
It is stopped, disaster hidden-trouble is avoided from root.
Specifically, the boost module 10 includes inductance L1, diode D1, metal-oxide-semiconductor M1, electric capacity C1 and current constant control chip
U1, the inductance L1 one end connection DC+ DC terminals, the other end connection diode D1 of the inductance L1 positive pole and metal-oxide-semiconductor
M1 drains；The negative pole of the diode D1 is grounded by electric capacity C1, is also connected with temperature protection module 20；The grid of the metal-oxide-semiconductor M1
Pole connection current constant control chip U1 Rv ends, the source ground of the metal-oxide-semiconductor M1, by inductance L1, diode D1, metal-oxide-semiconductor M1,
Electric capacity C1 and current constant control chip U1 constitutes DC-DC booster voltage topological circuits, DC+ dc voltage boosts to LED string
Operating voltage, wherein electric capacity C1 mainly play the steady direct current of filtering, improve the stability of operating voltage.In the present embodiment, institute
It is N-channel MOS pipe M1 to state metal-oxide-semiconductor M1, and the current constant control chip U1 selects model OZ568GN control chip.
Further, the temperature, which includes module, includes several quantity Thermal Cutoffs corresponding with LED light bar, each
Individual Thermal Cutoffs is connected between the positive pole of one LED light bar of the negative pole of the diode D1 and correspondence, is wrapped in the present embodiment
Two Thermal Cutoffs are included, the first Thermal Cutoffs FT1 and second temperature fuse FT2 are expressed as, by the first LED
Connect the first Thermal Cutoffs FT1 and second temperature fuse FT2 respectively on the LED string 12 of lamp string 11 and second, when LED string
During normal work, Thermal Cutoffs only serves energization action, when bad radiating, temperature rise occurs in LED light bar, once reach
The fusing-off temperature of Thermal Cutoffs, then disconnect immediately, and this lamp bar no longer works, and eliminates the hidden danger of LED light bar poor heat radiation.This reality
Apply in example, the Thermal Cutoffs is SMD Thermal Cutoffs, is mounted in LED light bar, LED light bar is detected in real time
Operating temperature.
Specifically, the current detection module 30 includes several quantity current sense resistor corresponding with LED light bar, often
The negative pole of one end correspondence one LED light bar of connection of one current sense resistor, the other end of all current sense resistors connects
Current constant control chip U1 Vp ends are connect, the quantity of current sense resistor described in the present embodiment is two, respectively first resistor
R1 and second resistance R2, described first resistor R1 one end connects the negative pole of the first LED string 11, and the first resistor R1's is another
End connection current constant control chip U1 Vp ends, described second resistance R2 one end connects the negative pole of the second LED string 12, described second
Resistance R2 other end connection current constant control chip U1 Vp ends.When the first LED string 11 and the second LED string operating temperature liter
It is high.During the first Thermal Cutoffs FT1 and second temperature fuse FT2 disconnections, because first resistor R1 and second resistance R2 is in LED
The most negative terminal of lamp string, it is impossible to detect lamp bar electric current, therefore output control signals to current constant control chip U1 so that boost module
10 shut-offs, whole backlight circuit is stopped, and further ensures that the security of backlight circuit.
Further, the lamp bar overheating protection circuit also includes 3rd resistor R3, the 4th resistance R4 and the 5th resistance
R5, the 3rd resistor R3 one end connect the source electrode of metal-oxide-semiconductor, the other end ground connection of the 3rd resistor R3；4th electricity
The one end for hindering R4 connects the negative pole of the first LED string 11, the other end connection current constant control chip U1's of the 4th resistance R4
Is1 ends；One end of the 5th resistance R5 connects the negative pole of the second LED string 12, the other end connection of the 5th resistance R5
Current constant control chip U1 Is2 ends.
The utility model correspondingly provides a kind of display device, and it includes lamp bar overheating protection circuit as described above, by
The lamp bar overheating protection circuit is described in detail in above, is not described further herein, further, the display is set
Standby also to include radiator, the LED light bar is pasted onto on the radiator, i.e., the utility model regard LED light bar as backlight
It is pasted onto on radiator and is radiated, it is ensured that the normal work and security of equipment, is protected while also being overheated by above-mentioned lamp bar
Protection circuit carries out overtemperature protection when LED light bar operating temperature is too high, it is ensured that LED light bar will not continue work when temperature is too high
Make, cause lamp bar to damage or even cause the security incidents such as fire.
In summary, in the utility model is provided lamp bar overheating protection circuit and display device, the lamp bar overheat is protected
Protection circuit includes several LED light bars, boost module and temperature protection module, is carried out the DC voltage of input by boost module
Boosting is handled, and the default operating voltage of output is to each LED light bar, and the temperature protection module is mounted in the LED light bar simultaneously
It is connected between the LED light bar and boost module, the temperature protection module is more than default temperature in the operating temperature of LED light bar
The current path of the LED light bar is controlled to disconnect when spending, the electric current that can disconnect lamp bar in time when lamp bar operating temperature is too high leads to
Road, it is to avoid due to the radiating loose contact that overlong time is caused, and then the decline of LED light bar heat dispersion is caused overheat hidden danger
Problem.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (10)
1. a kind of lamp bar overheating protection circuit, it is characterised in that including several LED light bars, boost module and temperature protection mould
Block, carries out boosting processing, the default operating voltage of output is described to each LED light bar by boost module by the DC voltage of input
Temperature protection module is mounted in the LED light bar and is connected between the LED light bar and boost module, the temperature protection
Module controls the current path of the LED light bar to disconnect when the operating temperature of LED light bar is more than preset temperature.
2. lamp bar overheating protection circuit according to claim 1, it is characterised in that also including current detection module, work as temperature
When the current path for spending all LED light bars of protection module control disconnects, current detection module output current cut-off signals to boosting
Module, closes the boost module.
3. lamp bar overheating protection circuit according to claim 1, it is characterised in that the boost module includes inductance, two
Pole pipe, metal-oxide-semiconductor, electric capacity and current constant control chip, one end connection DC+ DC terminals of the inductance, the other end of the inductance connect
Connect positive pole and the metal-oxide-semiconductor drain electrode of diode；The negative pole of the diode by capacity earth, be also connected with temperature protection module；Institute
The grid for stating metal-oxide-semiconductor connects the Rv ends of current constant control chip, the source ground of the metal-oxide-semiconductor.
4. lamp bar overheating protection circuit according to claim 3, it is characterised in that the temperature protection module includes some
Individual quantity Thermal Cutoffs corresponding with LED light bar, each Thermal Cutoffs is connected on the negative pole and correspondingly of the diode
Between the positive pole of one LED light bar.
5. lamp bar overheating protection circuit according to claim 2, it is characterised in that the current detection module includes some
Individual quantity current sense resistor corresponding with LED light bar, one end correspondence one LED light bar of connection of each current sense resistor
Negative pole, the other end of all current sense resistors is all connected with the Vp ends of current constant control chip.
6. lamp bar overheating protection circuit according to claim 4, it is characterised in that the Thermal Cutoffs is SMD temperature
Spend fuse.
7. lamp bar overheating protection circuit according to claim 3, it is characterised in that the metal-oxide-semiconductor is N-channel MOS pipe.
8. lamp bar overheating protection circuit according to claim 3, it is characterised in that the model of the current constant control chip
OZ568GN。
9. a kind of display device, it is characterised in that including the lamp bar overtemperature protection electricity as described in claim 1-8 any one
Road.
10. display device according to claim 9, it is characterised in that also including radiator, the LED light bar is pasted onto
On the radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720136281.2U CN206559686U (en) | 2017-02-15 | 2017-02-15 | A kind of lamp bar overheating protection circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720136281.2U CN206559686U (en) | 2017-02-15 | 2017-02-15 | A kind of lamp bar overheating protection circuit and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559686U true CN206559686U (en) | 2017-10-13 |
Family
ID=60010973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720136281.2U Active CN206559686U (en) | 2017-02-15 | 2017-02-15 | A kind of lamp bar overheating protection circuit and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559686U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019079986A1 (en) * | 2017-10-25 | 2019-05-02 | 深圳前海小有技术有限公司 | Sterilization light source module with temperature protection and surface disinfection and sterilization apparatus |
| CN112991977A (en) * | 2021-03-19 | 2021-06-18 | 杭州川致电子商务有限公司 | Outdoor LED display screen overheat protection subassembly |
-
2017
- 2017-02-15 CN CN201720136281.2U patent/CN206559686U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019079986A1 (en) * | 2017-10-25 | 2019-05-02 | 深圳前海小有技术有限公司 | Sterilization light source module with temperature protection and surface disinfection and sterilization apparatus |
| CN112991977A (en) * | 2021-03-19 | 2021-06-18 | 杭州川致电子商务有限公司 | Outdoor LED display screen overheat protection subassembly |
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| GR01 | Patent grant |