CN102496343A - Luminous diode driving circuit having short-circuit protection function - Google Patents
Luminous diode driving circuit having short-circuit protection function Download PDFInfo
- Publication number
- CN102496343A CN102496343A CN2011103868008A CN201110386800A CN102496343A CN 102496343 A CN102496343 A CN 102496343A CN 2011103868008 A CN2011103868008 A CN 2011103868008A CN 201110386800 A CN201110386800 A CN 201110386800A CN 102496343 A CN102496343 A CN 102496343A
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- control chip
- short
- switch element
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- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- 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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- Led Devices (AREA)
- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a luminous diode driving circuit having a short-circuit protection function, which comprises a boosting circuit, a first switch unit, a luminous diode serial and a control chip. The boosting circuit receives an input voltage and outputs a higher output voltage. The first switch unit is arranged between the boosting circuit and the luminous diode serial. The control chip is connected with the boosting circuit and the first switch unit and controls the first switch unit to disconnect when the luminous diode serial is in short circuit, so a current loop from an input power supply to the luminous diode serial is disconnected, the short-circuit protection can be realized, and the electric power consumption can be stopped.
Description
[technical field]
The invention relates to a kind of circuit of light-emitting diode light bar, particularly relevant for a kind of LED driving circuit of avoiding the tool short-circuit protection of unnecessary power consumption.
[background technology]
Please refer to shown in Figure 1; Fig. 1 is the known LED driving circuit that is used in the backlight liquid crystal display module; It mainly is to have comprised booster circuit 90, chip for driving 91 and LED serial 92; Wherein booster circuit 90 comprises inductance L 1, second switch pipe Q2 and diode D5, and said LED serial 92 comprises several light emitting diodes D1～D4.
Input power supply Vin provides enough voltage to drive then and lights said LED serial 92 after changing through said booster circuit 90.The said second switch pipe of chip for driving 91 may command Q2 opens or closes said booster circuit 90, and then controls the action of said LED serial 92.When the light emitting diode of said LED serial 92 is short-circuited, high electric current, high voltage possibly cause the circuit component damage.Therefore, said chip for driving 91 is through connecting the negative terminal of said LED serial 92, with the whether short circuit of detecting light emitting diode wherein, if be short-circuited, then turn-offs said second switch pipe Q2 to close said booster circuit 90, reaches the effect of short-circuit protection.
Yet said booster circuit is after 90s closing, though input power supply Vin does not obtain to boost, still the ground loop through said LED serial 92 continues consumed power.Therefore, this LED driving circuit still exists safe secret worry and effective problem of energy saving.
Die, be necessary to provide a kind of LED driving circuit of tool short-circuit protection, to solve the existing in prior technology problem.
[summary of the invention]
Fundamental purpose of the present invention is to provide a kind of LED driving circuit of tool short-circuit protection, will solve existing LED driving circuit and still have safe secret worry and effective problem of energy saving.
For reaching aforementioned purpose of the present invention, the present invention provides a kind of LED driving circuit of tool short-circuit protection, comprises:
One booster circuit receives an input voltage and exports a higher output voltage;
One first switch element is connected in said booster circuit;
One LED serial connects said first switch element, when the said first switch element conducting, receives said output voltage and drives and light; And
One control chip connects said booster circuit and said first switch element, and when said LED serial is short-circuited, breaks off said first switch element.
In one embodiment of this invention, said booster circuit comprises:
One first inductance connects said input voltage;
One diode, its anode are connected in said first inductance;
One electric capacity, its first end connects the negative electrode of said diode, and its second end connects said control chip; And
One second switch unit; Its first end is connected between the anode of first inductance and diode; Its second end ground connection, its 3rd end connects said control chip, and first end and the conducting between second end of switching the second switch unit according to the control signal of said control chip are whether.
In one embodiment of this invention, said second switch unit is a power transistor, and its first end is that source electrode and the 3rd end are grid for drain electrode, second end.
In one embodiment of this invention, said first switch element is a power transistor, and its drain electrode connects said booster circuit through one first resistance, and its source electrode connects said LED serial, and its grid connects said control chip; Said control chip connects the two ends of said first resistance, and whether is 0 volt through the following terminal voltage of detecting first resistance and judges whether said LED serial is short-circuited; When the following terminal voltage of first resistance was 0 volt, said control chip turn-offed said first switch element.
In one embodiment of this invention; Said first switch element is a power transistor; Its drain electrode connects said booster circuit through one first resistance, and its source electrode connects said LED serial, and its grid connects second end of said control chip and said electric capacity; Said control chip connects the two ends of said first resistance, and whether is 0 volt through the following terminal voltage of detecting first resistance and judges whether said LED serial is short-circuited; When the following terminal voltage of first resistance was 0 volt, said control chip turn-offed said first switch element and said second switch unit simultaneously.
The present invention mainly is through being connected one first switch element between booster circuit and the LED serial; Controlling first switch element by control chip breaks off when the LED serial short circuit; Make the input power supply be cut off, to reach short-circuit protection and the purpose that stops power consumption to the current return of LED serial.
[description of drawings]
Fig. 1 is the circuit diagram of an existing LED driving circuit.
Fig. 2 is the circuit diagram of LED driving circuit one preferred embodiment of tool short-circuit protection of the present invention.
[embodiment]
For making above-mentioned purpose of the present invention, characteristic and advantage more obviously understandable, hereinafter is special lifts preferred embodiment of the present invention, and conjunction with figs., elaborates as follows.Moreover, the direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side ", " interior ", " outward ", " side " etc., only be direction with reference to annexed drawings.Therefore, the direction term of use is in order to explanation and understands the present invention, but not in order to restriction the present invention.
Please refer to shown in Figure 2ly, Fig. 2 is the circuit diagram of LED driving circuit one preferred embodiment of tool short-circuit protection of the present invention.The LED driving circuit of tool short-circuit protection of the present invention consists predominantly of a booster circuit 10, one first switch element Q4, a LED serial 12 and a control chip 11.
Said booster circuit 10 connects an input voltage vin, in order to export one be higher than said input voltage vin output voltage.In the present embodiment, said booster circuit 10 comprises one first inductance L 2, a diode D10, a capacitor C 1 and a second switch unit Q3.Said first inductance L 2 is to connect said input voltage.The anode of said diode D10 connects said first inductance L 2.First end of said capacitor C 1 connects the negative electrode of said diode, and its second end connects said control chip 11.First end of said second switch unit Q3 is connected between the anode of first inductance and diode; Its second end ground connection; Its 3rd end connects said control chip 11, and first end and the conducting between second end of switching second switch unit Q3 according to the control signal of said control chip 11 are whether.
Aforesaid second switch unit Q3 is preferably a power transistor, and its first end is that source electrode and the 3rd end are grid for drain electrode, second end.Said control chip 11 can see through the mode of pulse wave width modulation (PWM) and come the continuous second switch unit Q3 that switches to close and conducting; To reach the purpose of boosting; Wherein when the Q3 conducting of second switch unit; Diode D10 presents reverse biased, is stored in said first inductance L 2 from the electric energy of input voltage vin; When second switch unit Q3 ended, diode D10 presented forward bias voltage drop, and therefore the electric energy that this moment, the capacitor C 1 reception input voltage vin 1 and first inductance L 2 were provided makes output voltage can be higher than input voltage vin.
The said first switch element Q4 is connected in said booster circuit 10; In the present embodiment; The said first switch element Q4 is a power transistor, and its drain electrode is through the negative electrode of the diode D10 of the said booster circuit 10 of one first resistance R, 2 connections and first end of capacitor C 1; Its source electrode connects said LED serial 12, and its grid connects said control chip 11; Said control chip 11 connects the two ends of said first resistance R 2.
Said LED serial 12 connects the said first switch element Q4, when the said first switch element Q4 conducting, receives said output voltage and drives and light; Said LED serial 12 comprises the light emitting diode D6～D9 of several serial connections.
Said control chip 11 is used to break off when said LED serial 12 is short-circuited the said first switch element Q4.In more detail; When normal light modulation; Said control chip 11 compares through pressure reduction on first resistance R 2 and control chip 11 inner constant current sources, realizes LED serial 12 constant currents, 1 driving of capacitor C that the operation of the said first switch element Q4 is at this moment then connected by its grid.When shorted to earth takes place in said LED serial 12; The following terminal voltage of first resistance R 2 that drain electrode connected of the said first switch element Q4 is 0 volt; Therefore, whether said control chip 11 can be 0 volt through the following terminal voltage of detecting first resistance R 2 and judge whether said LED serial 12 is short-circuited; When the following terminal voltage of first resistance R 2 is 0 volt; Said control chip 11 turn-offs the said first switch element Q4 and arrives the current return of LED serial 12 to cut off input voltage vin, and turn-offs said second switch unit Q3 simultaneously to close booster circuit 10.
Can know by above-mentioned explanation; There are safe secret worry and effective problem of energy saving compared to existing LED driving circuit; The LED driving circuit of tool short-circuit protection of the present invention is through being connected a switch element between booster circuit and the LED serial; Broken off when the LED serial shorted to earth by the control chip control switch unit, make the input power supply be cut off to the loop of LED serial, this power source voltage promptly can't send out; Thereby the realization short-circuit protection reaches the purpose of eliminating safe secret worry and avoiding energy consumption.
The present invention is described by above-mentioned related embodiment, yet the foregoing description is merely the example of embodiment of the present invention.Must be pointed out that disclosed embodiment does not limit scope of the present invention.On the contrary, being contained in the spirit of claims and the modification and impartial setting of scope includes in scope of the present invention.
Claims (5)
1. the LED driving circuit of a tool short-circuit protection, it is characterized in that: the LED driving circuit of said tool short-circuit protection comprises:
One booster circuit receives an input voltage and exports a higher output voltage;
One first switch element is connected in said booster circuit;
One LED serial connects said first switch element, when the said first switch element conducting, receives said output voltage and drives and light; And
One control chip connects said booster circuit and said first switch element, and when said LED serial is short-circuited, breaks off said first switch element.
2. the LED driving circuit of tool short-circuit protection as claimed in claim 1 is characterized in that: said booster circuit comprises:
One first inductance connects said input voltage;
One diode, its anode are connected in said first inductance;
One electric capacity, its first end connects the negative electrode of said diode, and its second end connects said control chip; And
One second switch unit; Its first end is connected between the anode of first inductance and diode; Its second end ground connection, its 3rd end connects said control chip, and first end and the conducting between second end of switching the second switch unit according to the control signal of said control chip are whether.
3. the LED driving circuit of tool short-circuit protection as claimed in claim 2 is characterized in that: said second switch unit is a power transistor, and its first end is that source electrode and the 3rd end are grid for drain electrode, second end.
4. the LED driving circuit of tool short-circuit protection as claimed in claim 1; It is characterized in that: said first switch element is a power transistor; Its drain electrode connects said booster circuit through one first resistance; Its source electrode connects said LED serial, and its grid connects said control chip; Said control chip connects the two ends of said first resistance, and whether is 0 volt through the following terminal voltage of detecting first resistance and judges whether said LED serial is short-circuited; When the following terminal voltage of first resistance was 0 volt, said control chip turn-offed said first switch element.
5. the LED driving circuit of tool short-circuit protection as claimed in claim 2; It is characterized in that: said first switch element is a power transistor; Its drain electrode connects said booster circuit through one first resistance; Its source electrode connects said LED serial, and its grid connects second end of said control chip and said electric capacity; Said control chip connects the two ends of said first resistance, and whether is 0 volt through the following terminal voltage of detecting first resistance and judges whether said LED serial is short-circuited; When the following terminal voltage of first resistance was 0 volt, said control chip turn-offed said first switch element and said second switch unit simultaneously.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110386800.8A CN102496343B (en) | 2011-11-29 | 2011-11-29 | Luminous diode driving circuit having short-circuit protection function |
| PCT/CN2011/083322 WO2013078667A1 (en) | 2011-11-29 | 2011-12-01 | Light emitting diode drive circuit with short circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110386800.8A CN102496343B (en) | 2011-11-29 | 2011-11-29 | Luminous diode driving circuit having short-circuit protection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102496343A true CN102496343A (en) | 2012-06-13 |
| CN102496343B CN102496343B (en) | 2014-07-16 |
Family
ID=46188162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110386800.8A Expired - Fee Related CN102496343B (en) | 2011-11-29 | 2011-11-29 | Luminous diode driving circuit having short-circuit protection function |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102496343B (en) |
| WO (1) | WO2013078667A1 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187002A1 (en) * | 2013-05-22 | 2014-11-27 | 深圳市华星光电技术有限公司 | Low-loss exception protection circuit and driving circuit thereof |
| CN104240651A (en) * | 2014-09-29 | 2014-12-24 | 深圳市华星光电技术有限公司 | Liquid crystal display device LED backlight source and liquid crystal display device |
| CN105611665A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | Shunting LED circuit |
| CN106455239A (en) * | 2016-12-01 | 2017-02-22 | 中山市恒能电子科技有限公司 | LED lamp power supply capable of reducing power at regular time |
| CN107437396A (en) * | 2016-05-27 | 2017-12-05 | 三星显示有限公司 | Display device |
| CN108682385A (en) * | 2018-07-26 | 2018-10-19 | 京东方科技集团股份有限公司 | Pixel circuit, image element driving method and display device |
| CN109639110A (en) * | 2018-12-20 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of booster circuit and charger |
| CN110545030A (en) * | 2019-10-10 | 2019-12-06 | 上海源微电子科技有限公司 | Boost topology load short-circuit protection circuit |
| TWI683598B (en) * | 2019-04-17 | 2020-01-21 | 宏碁股份有限公司 | Light-emitting module and light-emitting diode driving circuit |
| CN112533320A (en) * | 2019-08-28 | 2021-03-19 | 群光电能科技股份有限公司 | Light emitting diode control device |
| WO2021139653A1 (en) * | 2020-01-09 | 2021-07-15 | Oppo广东移动通信有限公司 | Flash driving circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858980A (en) * | 2006-05-17 | 2006-11-08 | 友达光电股份有限公司 | Synchronous switch boost transducer of light emitting diode driver |
| CN101335449A (en) * | 2007-06-29 | 2008-12-31 | 富士通天株式会社 | Power protection apparatus and electronic control unit |
| CN101594715A (en) * | 2008-05-29 | 2009-12-02 | 汽车照明罗伊特林根有限公司 | Electric circuit device |
| US20100194285A1 (en) * | 2009-02-04 | 2010-08-05 | Samsung Electronics Co., Ltd. | Light source driving apparatus and light source apparatus having the same |
| CN102118909A (en) * | 2010-02-05 | 2011-07-06 | 成都芯源系统有限公司 | Boost circuit for driving light emitting diode |
| CN102157919A (en) * | 2010-02-12 | 2011-08-17 | 硕颉科技股份有限公司 | Boost power supply conversion device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1919261A1 (en) * | 2006-10-30 | 2008-05-07 | Alcatel Lucent | Low frequency, constant current control circuit for power leds |
| CN100570978C (en) * | 2008-07-30 | 2009-12-16 | 电子科技大学 | Current deep constant-current output driving circuit with load short circuit protection function |
| CN101916550B (en) * | 2010-08-18 | 2012-06-27 | 福建捷联电子有限公司 | Light emitting diode driving circuit |
-
2011
- 2011-11-29 CN CN201110386800.8A patent/CN102496343B/en not_active Expired - Fee Related
- 2011-12-01 WO PCT/CN2011/083322 patent/WO2013078667A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858980A (en) * | 2006-05-17 | 2006-11-08 | 友达光电股份有限公司 | Synchronous switch boost transducer of light emitting diode driver |
| CN101335449A (en) * | 2007-06-29 | 2008-12-31 | 富士通天株式会社 | Power protection apparatus and electronic control unit |
| CN101594715A (en) * | 2008-05-29 | 2009-12-02 | 汽车照明罗伊特林根有限公司 | Electric circuit device |
| US20100194285A1 (en) * | 2009-02-04 | 2010-08-05 | Samsung Electronics Co., Ltd. | Light source driving apparatus and light source apparatus having the same |
| CN102118909A (en) * | 2010-02-05 | 2011-07-06 | 成都芯源系统有限公司 | Boost circuit for driving light emitting diode |
| CN102157919A (en) * | 2010-02-12 | 2011-08-17 | 硕颉科技股份有限公司 | Boost power supply conversion device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187002A1 (en) * | 2013-05-22 | 2014-11-27 | 深圳市华星光电技术有限公司 | Low-loss exception protection circuit and driving circuit thereof |
| CN104240651A (en) * | 2014-09-29 | 2014-12-24 | 深圳市华星光电技术有限公司 | Liquid crystal display device LED backlight source and liquid crystal display device |
| CN105611665A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | Shunting LED circuit |
| CN107437396B (en) * | 2016-05-27 | 2022-08-19 | Tcl华星光电技术有限公司 | Display device |
| CN107437396A (en) * | 2016-05-27 | 2017-12-05 | 三星显示有限公司 | Display device |
| CN106455239A (en) * | 2016-12-01 | 2017-02-22 | 中山市恒能电子科技有限公司 | LED lamp power supply capable of reducing power at regular time |
| CN108682385A (en) * | 2018-07-26 | 2018-10-19 | 京东方科技集团股份有限公司 | Pixel circuit, image element driving method and display device |
| CN109639110A (en) * | 2018-12-20 | 2019-04-16 | 上海艾为电子技术股份有限公司 | A kind of booster circuit and charger |
| CN109639110B (en) * | 2018-12-20 | 2024-04-02 | 上海艾为电子技术股份有限公司 | Boost circuit and charger |
| TWI683598B (en) * | 2019-04-17 | 2020-01-21 | 宏碁股份有限公司 | Light-emitting module and light-emitting diode driving circuit |
| CN112533320A (en) * | 2019-08-28 | 2021-03-19 | 群光电能科技股份有限公司 | Light emitting diode control device |
| CN112533320B (en) * | 2019-08-28 | 2023-05-12 | 群光电能科技股份有限公司 | LED control device |
| CN110545030A (en) * | 2019-10-10 | 2019-12-06 | 上海源微电子科技有限公司 | Boost topology load short-circuit protection circuit |
| WO2021139653A1 (en) * | 2020-01-09 | 2021-07-15 | Oppo广东移动通信有限公司 | Flash driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102496343B (en) | 2014-07-16 |
| WO2013078667A1 (en) | 2013-06-06 |
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Granted publication date: 20140716 |