CN201716965U - LED backlight protection circuit - Google Patents
LED backlight protection circuit Download PDFInfo
- Publication number
- CN201716965U CN201716965U CN2010202618557U CN201020261855U CN201716965U CN 201716965 U CN201716965 U CN 201716965U CN 2010202618557 U CN2010202618557 U CN 2010202618557U CN 201020261855 U CN201020261855 U CN 201020261855U CN 201716965 U CN201716965 U CN 201716965U
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- resistance
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- led
- led backlight
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Abstract
A LED backlight protection circuit is to arrange an over-voltage protection module between a LED backlight power supply module and a LED backlight. In the over-voltage protection module, a resistance R2 is connected at one end with the LED backlight power supply module and at the other end with one end of a resistance R3, one end of a capacitance C1, a cathode terminal of a diode D1 and a positive input terminal of a voltage comparator U1. Other ends of the resistance R3 and the capacitance C1 are both grounded. An anode terminal of the diode D1 is connected with an output terminal of the voltage comparator U1, one end of a resistance R4 and an anode terminal of a diode D2. The other end of the resistance R4 is in connection with an input voltage. The cathode terminal of the diode D2 is connected with the LED backlight. A resistance R1 is connected at one end with a reference voltage V1 and at the other end with a negative input terminal of the voltage comparator. When the voltage and the current of a power supply circuit of the LED backlight is too large for the sake of short circuits, the over-voltage protection module can automatically disconnect the power supply circuit from the LED backlight, thereby effectively protecting the LED backlight.
Description
Technical field
The utility model belongs to a kind of holding circuit, refers to a kind of LED-backlit source protection circuit especially.
Background technology
Along with making constant progress of LED technology, use LED to become a kind of trend as the backlight of display.The LED-backlit source has that illumination effect is good, the life-span is long, low power consumption and other advantages.But when situation such as short circuit occurring when the circuit of equipment, the voltage and current that its moment increases can damage the LED-backlit source, even it can be burnt.So, need provide a kind of measure to come the LED-backlit source is effectively protected.
The utility model content
For achieving the above object, the utility model provides a kind of LED-backlit source protection circuit.
The technical scheme that the utility model is taked is as follows:
LED-backlit source protection circuit is to be provided with an overvoltage protective module between LED-backlit source supply module and LED-backlit source.This overvoltage protective module comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, diode D1, diode D2, capacitor C 1 and voltage comparator U1.Wherein, one end of resistance R 2 connects LED-backlit source supply module, the other end connects an end of resistance R 3, one end of capacitor C 1, the electrode input end of the cathode terminal of diode D1 and voltage comparator U1, the other end of the other end of resistance R 3 and capacitor C 1 is ground connection all, the anode tap of diode D1 then connects the output terminal of voltage comparator U1, one end of resistance R 4 and the anode tap of diode D2, the other end of resistance R 4 connects an input voltage, the cathode terminal of diode D2 connects the LED-backlit source, one end of resistance R 1 connects reference voltage V 1, and the other end then connects the negative input of voltage comparator.
The beneficial effects of the utility model are: this circuit has the effect of protection to the LED-backlit source; when the feed circuit in LED-backlit source the excessive situation of electric current and voltage occurs because of short circuit etc.; can cut off being connected of feed circuit and LED-backlit source automatically, thereby protect the LED-backlit source effectively.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a schematic diagram of the present utility model.
Among the figure:
10LED backlight supply module, 20 overvoltage protective modules,
The 30LED backlight.
Embodiment
Below in conjunction with Fig. 1 and Fig. 2 the utility model is further described:
LED-backlit source protection circuit is to be provided with an overvoltage protective module 20 (referring to Fig. 1) between LED-backlit source supply module 10 and LED-backlit source 30.This overvoltage protective module 20 comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, diode D1, diode D2, capacitor C 1 and voltage comparator U1.Wherein, one end of resistance R 2 connects LED-backlit source supply module, the other end connects an end of resistance R 3, one end of capacitor C 1, the electrode input end of the cathode terminal of diode D1 and voltage comparator U1, the other end of the other end of resistance R 3 and capacitor C 1 is ground connection all, the anode tap of diode D1 then connects the output terminal of voltage comparator U1, one end of resistance R 4 and the anode tap of diode D2, the other end of resistance R 4 connects an input voltage, the cathode terminal of diode D2 connects the LED-backlit source, one end of resistance R 1 connects reference voltage V 1, and the other end then connects the negative input of voltage comparator.Voltage comparator U1 compares the reference voltage V 1 of the voltage of electrode input end and negative input in real time; when if the voltage of LED-backlit source supply module 10 the excessive situation of electric current and voltage occurs because of short circuit etc.; the voltage of the electrode input end of voltage comparator U1 is greater than reference voltage V 1; then voltage comparator U1 ends; its output terminal no-voltage and electric current output, thus play the effect in protection LED-backlit source 30.Diode D1 plays reverse protection, and diode D2 then plays current limliting.
Certainly, above embodiment just is explanation rather than restriction the utility model, the above only is preferred embodiment of the present utility model, so all equivalences of being done according to the described method of the utility model patent claim change or modify, is included in the utility model patent claim.
Claims (1)
1.LED backlight holding circuit; it is characterized in that: between LED-backlit source supply module and LED-backlit source, be provided with an overvoltage protective module; this overvoltage protective module comprises resistance R 1; resistance R 2; resistance R 3; resistance R 4; diode D1; diode D2; capacitor C 1 and voltage comparator U1; wherein; one end of resistance R 2 connects LED-backlit source supply module; the other end connects an end of resistance R 3; one end of capacitor C 1; the electrode input end of the cathode terminal of diode D1 and voltage comparator U1; the other end of the other end of resistance R 3 and capacitor C 1 is ground connection all; the anode tap of diode D1 then connects the output terminal of voltage comparator U1; one end of resistance R 4 and the anode tap of diode D2; the other end of resistance R 4 connects an input voltage; the cathode terminal of diode D2 connects the LED-backlit source; one end of resistance R 1 connects reference voltage V 1, and the other end then connects the negative input of voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202618557U CN201716965U (en) | 2010-07-16 | 2010-07-16 | LED backlight protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202618557U CN201716965U (en) | 2010-07-16 | 2010-07-16 | LED backlight protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201716965U true CN201716965U (en) | 2011-01-19 |
Family
ID=43462972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202618557U Expired - Fee Related CN201716965U (en) | 2010-07-16 | 2010-07-16 | LED backlight protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201716965U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107863073A (en) * | 2017-12-22 | 2018-03-30 | 深圳Tcl新技术有限公司 | LCOALDIMMING backlight drive circuits and display device |
| CN113225875A (en) * | 2021-04-20 | 2021-08-06 | 深圳市崧盛电子股份有限公司 | Drive power supply and output short-circuit protection circuit thereof |
| CN114863879A (en) * | 2022-05-23 | 2022-08-05 | 惠科股份有限公司 | Organic light emitting diode control circuit and display panel |
-
2010
- 2010-07-16 CN CN2010202618557U patent/CN201716965U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107863073A (en) * | 2017-12-22 | 2018-03-30 | 深圳Tcl新技术有限公司 | LCOALDIMMING backlight drive circuits and display device |
| CN113225875A (en) * | 2021-04-20 | 2021-08-06 | 深圳市崧盛电子股份有限公司 | Drive power supply and output short-circuit protection circuit thereof |
| CN114863879A (en) * | 2022-05-23 | 2022-08-05 | 惠科股份有限公司 | Organic light emitting diode control circuit and display panel |
| US11900877B2 (en) | 2022-05-23 | 2024-02-13 | HKC Corporation Limited | Organic light-emitting diode control circuit and display panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20180716 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |