CN102111931A - Method and system for controlling power supply source of light-emitting diode (LED) - Google Patents
Method and system for controlling power supply source of light-emitting diode (LED) Download PDFInfo
- Publication number
- CN102111931A CN102111931A CN2009102432259A CN200910243225A CN102111931A CN 102111931 A CN102111931 A CN 102111931A CN 2009102432259 A CN2009102432259 A CN 2009102432259A CN 200910243225 A CN200910243225 A CN 200910243225A CN 102111931 A CN102111931 A CN 102111931A
- Authority
- CN
- China
- Prior art keywords
- emitting diode
- light
- power supply
- voltage
- driver
- 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.)
- Pending
Links
Images
Landscapes
- Led Devices (AREA)
Abstract
The invention relates to a method and system for controlling a power supply source of a light-emitting diode (LED). The method comprises the steps: collecting the working voltages of the LED; and when the working voltage of the LED is constant, adjusting the power supply source of the LED so as to ensure that the output voltage of the power supply source is matched with the working voltage of the LED in a stable state, and adjusting the driver of the LED so as to keep the current of the LED constant. By collecting the voltage at two ends of the LED and adjusting the power supply source when the LED works in a stable state, i.e. a stable voltage-drop state or a stable working-voltage state, so as to ensure that the output voltage of the power supply source is matched with the constant working voltage of the LED, the extra voltage drop of the driver is reduced, the power consumption of the driver is decreased, thus, the temperature of the driver is further reduced, the service life of the driver is prolonged and the driving efficiency of a power source is improved.
Description
Technical field
The present invention relates to LED power source control technology field, relate in particular to a kind of method and system of controlling the light-emitting diode power supply.
Background technology
Light-emitting diode (LED) is a kind of luminescent device of working under constant current.At present, light-emitting diode is widely used in display devices such as display, TV as backlight.
In the prior art, the power control circuit of light-emitting diode comprises constant voltage source, driver.Light-emitting diode is connected with driver, and constant voltage source provides constant voltage for light-emitting diode and driver.And required voltage when the constant voltage that constant voltage source provides often is higher than the light-emitting diode steady operation.This is when being the light-emitting diode power supply owing to constant voltage source, the rising of temperature when working along with light-emitting diode, the internal resistance meeting descends, thereby the voltage drop on light-emitting diode will be lower than the driving voltage to its anticipation, be lower than that part of pressure drop of the driving voltage of anticipation, will be divided on the driver.The driver of bearing dividing potential drop is converted into heat energy to this part electric energy, thereby the temperature of driver is raise, and reduce useful life, and the stability of work reduces.Meanwhile, also reduced utilance to the output voltage of power supply.
Summary of the invention
The objective of the invention is to propose a kind of method and system of controlling the light-emitting diode power supply, with power consumption on the driver that reduces light-emitting diode, prolong the useful life of driver, this system is particularly useful on the back light source in LED.
The invention provides a kind of method of controlling the light-emitting diode power supply, comprising:
Gather the operating voltage of light-emitting diode;
When the operating voltage of described light-emitting diode is constant, regulate the power supply of described light-emitting diode, operating voltage when the output voltage of described power supply and described light-emitting diode are stablized is complementary, and regulate the driver of described light-emitting diode, so that the electric current of described light-emitting diode keeps is constant.
The present invention also provides a kind of system that controls the light-emitting diode power supply, comprising:
Voltage sensor, the operating voltage that is used to gather light-emitting diode;
Driver is connected with described light-emitting diode;
Driving governor is used to regulate the driver of described light-emitting diode;
Controller, link to each other with described voltage sensor, be used for operating voltage at described light-emitting diode when constant, regulate the power supply of described light-emitting diode, operating voltage when the output voltage of described power supply and described light-emitting diode are stablized is complementary, and regulate described driver by described driving governor, so that the electric current of described light-emitting diode keeps is constant.
Technique scheme is by gathering the operating voltage at light-emitting diode two ends, and the light-emitting diode working stability be pressure drop stable also be under the constant situation of operating voltage, regulate power supply, the constant operating voltage of the voltage of its output and Light-Emitting Diode is complementary, thereby reduced pressure drop extra on the driver, reduced the power consumption of driver, and then reduced the temperature of driver, prolong the useful life of driver, and improved the driving efficient of power supply.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
The flow chart of the method for the control light-emitting diode power supply that Fig. 1 provides for the embodiment of the invention;
The structural representation of the system of the control light-emitting diode power supply that Fig. 2 provides for the embodiment of the invention;
The schematic diagram of the applied side-light type back light of system of the control light-emitting diode power supply that Fig. 3 A provides for the embodiment of the invention;
The generalized section of the applied side-light type back light of system of the control light-emitting diode power supply that Fig. 3 B provides for the embodiment of the invention;
The schematic diagram of the applied direct-light-type backlight of system of the control light-emitting diode power supply that Fig. 4 provides for the embodiment of the invention;
The application schematic diagram of the system of the control light-emitting diode power supply that Fig. 5 provides for the embodiment of the invention;
The distributing position schematic diagram of voltage sensor 54 on direct-light-type backlight in the system of the control light-emitting diode power supply that Fig. 6 provides for the embodiment of the invention.
Embodiment
The flow chart of the method for the control light-emitting diode power supply that Fig. 1 provides for the embodiment of the invention, this method comprises:
As gather the voltage of light-emitting diode in real time by voltage sensor.
As working as light-emitting diode from being energized to operate as normal, its voltage also never is stabilized to stable, and remains on a constant magnitude of voltage as 3.0 volts.According to the operating voltage of gathering, the constant voltage during the light-emitting diode operate as normal as can be known.When remaining on 3.0 volts, regulate the power supply of light-emitting diode as operating voltage when light-emitting diode, make it to export with 3.0 volts of voltages that are complementary as 3.0 volts.At this moment, regulate the driver of described light-emitting diode,, recover whole light-emitting diode work system because the voltage of this constant voltage source reduces so that the maintenance of the electric current of described light-emitting diode is constant, and the constant current of the moment that loses control balance.
When the power supply of light-emitting diode is digital controlled standard constant voltage follower, can regulate digital controlled standard constant voltage follower by the pulse width modulation ripple, the supply voltage that the operating voltage when making its output and light-emitting diode constant is complementary.Perhaps can regulate digital controlled standard constant voltage follower, the supply voltage that the operating voltage when making its output and light-emitting diode constant is complementary by serial or parallel communications protocol data signals transmitted.
When the power supply of light-emitting diode is the DC converting voltage source, can regulate the DC converting voltage source, the supply voltage that the operating voltage when making its output and light-emitting diode constant is complementary by changing voltage setting resistance.
The technical scheme that the embodiment of the invention provides is known the variation of light-emitting diode both end voltage, and at the light-emitting diode working stability, is suitably regulated the power supply output voltage by gathering the operating voltage at light-emitting diode two ends.Because required voltage is less than the output voltage of power supply behind the light-emitting diode steady operation, thereby the output voltage of the power supply after regulating can be reduced, operating voltage with the coupling light-emitting diode, thereby make the voltage that carries on the driver also reduce thereupon, the power consumption on the driver and the heat energy of generation have been reduced, prolong the useful life of driver, improved the driving efficient of power supply.
The method of the control light-emitting diode power supply that the embodiment of the invention provides also can comprise:
The operating voltage that collects is carried out signal amplifies.
The method of the control light-emitting diode power supply that the embodiment of the invention provides also can comprise:
Operating voltage after the signal amplification is carried out signal filtering.
The structural representation of the system of the control light-emitting diode power supply that Fig. 2 provides for the embodiment of the invention.Comprise: voltage sensor 21, driver 22, driving governor 23 and controller 24.Voltage sensor 21 is used to gather the operating voltage of light-emitting diode, specifically sees the explanation of above-mentioned steps 11 for details; Driver 22 is connected with described light-emitting diode; Driving governor 23 is used to regulate the driver 22 of described light-emitting diode; Controller 24 links to each other with described voltage sensor, be used for operating voltage at described light-emitting diode when constant, regulate the power supply of described light-emitting diode, operating voltage when the output voltage of described power supply and described light-emitting diode are stablized is complementary, and by the described driver 22 of described driving governor 23 adjustings, so that the maintenance of the electric current of described light-emitting diode is constant, specifically see the explanation of above-mentioned steps 12 for details.
Described controller 24 can be used for regulating digital controlled standard constant voltage follower by the pulse width modulation ripple, perhaps be used for regulating digital controlled standard constant voltage follower by the serial communication protocol data signals transmitted, perhaps be used for regulating digital controlled standard constant voltage follower, perhaps be used for regulating the DC converting voltage source by changing voltage setting resistance by the data-signal of parallel communication protocol transmission.
In the present embodiment, the system of control light-emitting diode power supply knows the variation of light-emitting diode both end voltage, and at the light-emitting diode working stability, suitably regulates the power supply output voltage by gathering the operating voltage at light-emitting diode two ends.Because required voltage is less than the output voltage of power supply behind the light-emitting diode steady operation, thereby the output voltage of the power supply after regulating can be reduced, operating voltage with the coupling light-emitting diode, thereby make the voltage that carries on the driver also reduce thereupon, the power consumption on the driver and the heat energy of generation have been reduced, prolong the useful life of driver, improved the driving efficient of power supply.
The system of the control light-emitting diode power supply that the embodiment of the invention provides also can comprise: signal amplification circuit 25.Signal amplification circuit 25 is used for that the operating voltage that described voltage sensor 21 collects is carried out signal and amplifies.
The system of the control light-emitting diode power supply that the embodiment of the invention provides also can comprise: signal filter circuit 26.Signal filter circuit 26 is used for the operating voltage that described signal amplification circuit 25 carries out after signal amplifies is carried out signal filtering.
Backlight roughly is divided into two kinds according to lamp and optical material structure, and a kind of is the edge-lit mode, also is side-light type back light, shown in Fig. 3 A, Fig. 3 B.Side-light type back light comprises five parts: LED light lamp group 31, optical thin film material 32, light guide plate 33, circuit board 34, structural shell 35 etc.Also relate to some structural annexes in addition, repeat no more here.Another kind is an end illumination mode, also is direct-light-type backlight, as shown in Figure 4.Mainly comprise four parts: optical thin film material 41, structural shell 42, LED light lamp group 43, circuit board 44, also relate to some structural annexes in addition, repeat no more here.
Be that example describes with side-light type back light and direct-light-type backlight below.
Light-emitting diode powersupply system in control side-light type back light and the direct-light-type backlight as shown in Figure 5, the application schematic diagram of the system of the control light-emitting diode power supply that Fig. 5 provides for the embodiment of the invention.Be on the hardware platform with side-light type back light and direct-light-type backlight, the system of control light-emitting diode power supply comprises: driving governor 51, driver 52, light-emitting diode 53, voltage sensor 54, signal amplification circuit 55, signal filter circuit 56, controller 57, constant voltage output unit 58.Wherein, the distributing position of voltage sensor 54 on direct-light-type backlight as shown in Figure 6, the relevant position of voltage sensor 54 is the position of corresponding light-emitting diode.As position R1, position R2 place is red light emitting diodes and voltage sensor 54 thereof, and position B1, position B2 place are blue LED and voltage sensor 54 thereof, and position G1, position G2 place are green LED and voltage sensor 54 thereof.The voltage sensor of right quantity, the operating voltage of coming the light-emitting diode on the sampling Detection backlight are installed according to the size of backlight in the entire backlight source.
The operation principle of the system of control light-emitting diode power supply is: driving governor 51 output control signals, this signal can make driver 52 operate as normal, and gives corresponding light-emitting diode in the light-emitting diode 53 according to the given current value of driving governor 51 and the position output current of LED light lamp group correspondence.The representational light-emitting diode both end voltage of part value in the voltage sensor 54 sampling Detection LED light lamp groups, usually, because voltage sensor 54 detected signals are less than 20 millivolts, therefore this signal need be amplified by signal amplification circuit 55, again this signal is passed through signal filter circuit 56 filtering, obtain the operating voltage that correct sensor signal is a light-emitting diode.The operating voltage of light-emitting diode is exported to constant voltage output unit 58 and driving governor 51 through controller 57.Wherein, controller 57 outputs signal to constant voltage output unit 58, and to reduce the constant voltage values of its output, the voltage when making it with the constant work of light-emitting diode is complementary.At this moment, whole light-emitting diode work system is because the voltage reduction of this constant voltage source, and the constant current that loses moment is controlled balance, it is exactly correction or compensation to the light-emitting diode operating current that controller 57 outputs signal to driving governor 51, recovers the control balance of light-emitting diode constant current.The control loop of constant current balance is the loop of driving governor 51 among Fig. 5, driver 52, light-emitting diode 53, voltage sensor 54, signal amplification circuit 55, signal filter circuit 56, controller 57 formations.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a method of controlling the light-emitting diode power supply is characterized in that, comprising:
Gather the operating voltage of light-emitting diode;
When the stable operating voltage of described light-emitting diode, regulate the power supply of described light-emitting diode, operating voltage when the output voltage of described power supply and described light-emitting diode are stablized is complementary, and regulate the driver of described light-emitting diode, so that the electric current of described light-emitting diode keeps is constant.
2. the method for control light-emitting diode power supply according to claim 1 is characterized in that, also comprises:
The operating voltage that collects is carried out signal amplifies.
3. the method for control light-emitting diode power supply according to claim 2 is characterized in that, also comprises:
Operating voltage after the signal amplification is carried out signal filtering.
4. according to the method for each described control light-emitting diode power supply in the claim 1 to 3, it is characterized in that the power supply of regulating described light-emitting diode comprises:
Regulate digital controlled standard constant voltage follower by the pulse width modulation ripple.
5. according to the method for each described control light-emitting diode power supply in the claim 1 to 3, it is characterized in that the power supply of regulating described light-emitting diode comprises:
Regulate digital controlled standard constant voltage follower by the serial communication protocol data signals transmitted.
6. according to the method for each described control light-emitting diode power supply in the claim 1 to 3, it is characterized in that the power supply of regulating described light-emitting diode comprises:
Regulate digital controlled standard constant voltage follower by the data-signal of parallel communication protocol transmission.
7. according to the method for each described control light-emitting diode power supply in the claim 1 to 3, it is characterized in that the power supply of regulating described light-emitting diode comprises:
Regulate the DC converting voltage source by changing voltage setting resistance.
8. a system that controls the light-emitting diode power supply is characterized in that, comprising:
Voltage sensor, the operating voltage that is used to gather light-emitting diode;
Driver is connected with described light-emitting diode;
Driving governor is used to regulate the driver of described light-emitting diode;
Controller, link to each other with described voltage sensor, be used for operating voltage at described light-emitting diode when constant, regulate the power supply of described light-emitting diode, operating voltage when the output voltage of described power supply and described light-emitting diode are stablized is complementary, and regulate described driver by described driving governor, so that the electric current of described light-emitting diode keeps is constant.
9. the system of control light-emitting diode power supply according to claim 8 is characterized in that, also comprises:
Signal amplification circuit, the operating voltage that is used for that described voltage sensor is collected carry out signal and amplify.
10. the system of control light-emitting diode power supply according to claim 9 is characterized in that, also comprises:
Signal filter circuit is used for the operating voltage that described signal amplification circuit carries out after signal amplifies is carried out signal filtering.
11. the system of control light-emitting diode power supply according to claim 8, it is characterized in that, described controller is used for regulating digital controlled standard constant voltage follower by the pulse width modulation ripple, perhaps be used for regulating digital controlled standard constant voltage follower by the serial communication protocol data signals transmitted, perhaps be used for regulating digital controlled standard constant voltage follower, perhaps be used for regulating the DC converting voltage source by changing voltage setting resistance by the data-signal of parallel communication protocol transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102432259A CN102111931A (en) | 2009-12-29 | 2009-12-29 | Method and system for controlling power supply source of light-emitting diode (LED) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102432259A CN102111931A (en) | 2009-12-29 | 2009-12-29 | Method and system for controlling power supply source of light-emitting diode (LED) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102111931A true CN102111931A (en) | 2011-06-29 |
Family
ID=44175911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102432259A Pending CN102111931A (en) | 2009-12-29 | 2009-12-29 | Method and system for controlling power supply source of light-emitting diode (LED) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102111931A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118437A (en) * | 2015-09-21 | 2015-12-02 | 京东方科技集团股份有限公司 | Display drive method and device, and display device |
| CN108648723A (en) * | 2018-05-14 | 2018-10-12 | 昆山国显光电有限公司 | Reduce method and circuit, the display screen and electric terminal of display screen power consumption |
| CN110021264A (en) * | 2018-09-07 | 2019-07-16 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| CN110996457A (en) * | 2019-12-31 | 2020-04-10 | 惠州视维新技术有限公司 | LED drive circuit, device, LED control protection method and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1658729A (en) * | 2004-02-17 | 2005-08-24 | 日本先锋公司 | Lighting device and lighting system |
| WO2007023454A1 (en) * | 2005-08-26 | 2007-03-01 | Koninklijke Philips Electronics N.V. | Led light source for backlighting with integrated electronics |
| CN2935615Y (en) * | 2006-08-03 | 2007-08-15 | 维用国际股份有限公司 | Power supply device with multi-path constant current output |
| CN201243211Y (en) * | 2007-12-10 | 2009-05-20 | 广州擎天实业有限公司 | Voltage follow-up type dynamic battery charger |
-
2009
- 2009-12-29 CN CN2009102432259A patent/CN102111931A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1658729A (en) * | 2004-02-17 | 2005-08-24 | 日本先锋公司 | Lighting device and lighting system |
| WO2007023454A1 (en) * | 2005-08-26 | 2007-03-01 | Koninklijke Philips Electronics N.V. | Led light source for backlighting with integrated electronics |
| CN2935615Y (en) * | 2006-08-03 | 2007-08-15 | 维用国际股份有限公司 | Power supply device with multi-path constant current output |
| CN201243211Y (en) * | 2007-12-10 | 2009-05-20 | 广州擎天实业有限公司 | Voltage follow-up type dynamic battery charger |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118437A (en) * | 2015-09-21 | 2015-12-02 | 京东方科技集团股份有限公司 | Display drive method and device, and display device |
| US10269299B2 (en) | 2015-09-21 | 2019-04-23 | Boe Technology Group Co., Ltd. | Display device and method for obtaining a data voltage to be output to rows of pixel circuits |
| CN108648723A (en) * | 2018-05-14 | 2018-10-12 | 昆山国显光电有限公司 | Reduce method and circuit, the display screen and electric terminal of display screen power consumption |
| CN110021264A (en) * | 2018-09-07 | 2019-07-16 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel |
| CN110996457A (en) * | 2019-12-31 | 2020-04-10 | 惠州视维新技术有限公司 | LED drive circuit, device, LED control protection method and storage medium |
| WO2021135278A1 (en) * | 2019-12-31 | 2021-07-08 | 惠州视维新技术有限公司 | Led drive circuit, device, led control and protection method, and storage medium |
| CN110996457B (en) * | 2019-12-31 | 2023-05-23 | 惠州视维新技术有限公司 | LED driving circuit, device, LED control protection method and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102026444B (en) | Led ballast power supply having digital controller | |
| CN103188853B (en) | Predictive control of power converter for LED driver | |
| CN104066234B (en) | Light emitting element driving circuit and control circuit thereof and method | |
| CN102111931A (en) | Method and system for controlling power supply source of light-emitting diode (LED) | |
| CN100511377C (en) | System and method for driving keypad backlight with balance-dimming capability | |
| CN102427644B (en) | Zero luminous decay realizing method and control system for LED (light-emitting diode) road lighting lamp | |
| CN202404873U (en) | Constant voltage and constant current drive circuit of LED display screen | |
| CN104993873A (en) | Optical module | |
| CN104206013A (en) | Led lighting system | |
| CN102917499A (en) | DC (Direct Current)/DC-based LED (Light Emitting Diode) driving controller for lighting | |
| CN103457153B (en) | The average power control loop and method controlled by Laser Power Devices voltage close loop | |
| CN202059637U (en) | LED constant current and high temperature current-limiting drive circuit using crystal triode | |
| CN202268152U (en) | Backlight constant-current and constant-voltage driving circuit for display screen | |
| CN202190336U (en) | LED lamp parallel connection flow equalization and dimming control circuit and LCD TV | |
| CN103236644A (en) | Method and device for regulating working temperature of small-packaged hot pluggable optical module | |
| CN101599796A (en) | Laser life-span end of a period alarm producing method | |
| CN101170850A (en) | Light source driving circuit | |
| CN110418456A (en) | A kind of processing method and LED module based on power line transmission amplitude modulation signal | |
| CN101636019B (en) | Active multi-channel LED driving power source system | |
| CN103346807A (en) | Automatic temperature control circuit | |
| CN202269063U (en) | Control circuit of zero light attenuation of LED road illumination lamp | |
| CN201839487U (en) | LED multi-channel constant-current control circuit | |
| CN101956962B (en) | Avoid light-emitting diode assembly and the method for soft boot flash | |
| CN114760001A (en) | Control method for automatic calibration of single TEC with two lasers in multipath DWDM | |
| CN100463380C (en) | Bias circuit for direct modulated laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110629 |