CN103596343A - LED driven feedback control circuit - Google Patents
LED driven feedback control circuit Download PDFInfo
- Publication number
- CN103596343A CN103596343A CN201310619291.8A CN201310619291A CN103596343A CN 103596343 A CN103596343 A CN 103596343A CN 201310619291 A CN201310619291 A CN 201310619291A CN 103596343 A CN103596343 A CN 103596343A
- Authority
- CN
- China
- Prior art keywords
- feedback control
- control circuit
- led
- operational amplifier
- resistance
- 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
Abstract
The invention provides an LED driven feedback control circuit for feedback control of an adjustable reference power supply in an LED driving power supply. The LED driven feedback control circuit is characterized by comprising a current feedback loop and a voltage feedback loop, wherein the current feedback loop comprises a first operational amplifier, a first voltage dividing resistor, a second voltage dividing resistor, a first compensation resistor, a first compensation capacitor and a first current-limiting resistor. The first voltage dividing resistor and the second voltage dividing resistor are in series connection with the in-phase input end of the first operational amplifier, the first current-limiting resistor is connected to the inverted input end of the first operational amplifier, and the first compensation resistor and the first compensation capacitor are connected between the inverted input end and the output end of the first operational amplifier in series. Compared with the prior art, the LED driven feedback control circuit can prevent an LED lamp from being damaged by overhigh voltage.
Description
Technical field
The present invention relates to feedback control circuit, relate in particular to the feedback control circuit that a kind of LED drives.
Background technology
In recent years, along with the quickening of course of industrialization, the environmental pollution that greenhouse gas emission and consequent " greenhouse effect " that the carbon dioxide of take is master are brought has become the problem that the mankind have to face.In order to reduce carbon dioxide isothermal chamber gas purging, reply global warming, finds the energy efficient, clean, environmental protection and becomes extremely urgent.
At present the lighting source of China be take poor efficiency light source as main, although China has organized and implemented Green Lighting Project, compares and also exists larger gap with the developed country such as America and Europe.Along with development and the application of new material, new technology, efficient illumination product is just progressively to miniaturization, high light efficiency, and the long-life, pollution-free, natural daylight future development.
LED as the 4th generation light source, possessed all features of efficient illumination, many countries, in order to help LED industry, have formulated relevant action plan.As " " the solid-state illumination plan " of the rainbow plan ”， U.S., " " LED glittering 1530 " of 21 century illumination plan ”He Korea S of Japan of European Union.At present, China starts " national Semiconductor Lighting " and " ten city ten thousand exhibitions " semiconductor lighting application Model City scheme, is used for promoting the development of China LED Lighting Industry.LED driving power, as the key components of LED lamp, plays vital effect to the performance of light fixture and life-span.
Existing driving circuit of high-power LED lamp adopts two-stage drive, but may have spread of voltage and cause LED lamp to damage, and this just needs a feedback control circuit to ensure operating voltage and the electric current of LED.
Therefore be necessary to provide a kind of new feedback control circuit to solve the problems referred to above.
Summary of the invention
The present invention relates to the feedback control circuit that a kind of LED drives.
To achieve the above object of the invention, the invention provides the feedback control circuit that a kind of LED drives, it comprises:
Comprise current feedback ring and Voltage Feedback ring, described current feedback ring comprises one first operational amplifier, the first divider resistance, the second divider resistance, the first compensating resistance, the first building-out capacitor, the first current-limiting resistance, wherein the first divider resistance and the second divider resistance are connected in series in the in-phase input end of the first operational amplifier, the first current-limiting resistance is connected in the inverting input of the first operational amplifier, and described the first compensating resistance and the first building-out capacitor are connected in series between the inverting input and output of the first operational amplifier.
As a further improvement on the present invention, described Voltage Feedback ring, comprise with the second operational amplifier, the 3rd divider resistance, the 4th divider resistance, the second building-out capacitor, wherein, the 3rd divider resistance and the 4th divider resistance are connected in series in the second operational amplifier reverse input end, and described the second compensating resistance and the second building-out capacitor are connected in series between the inverting input and output of the second operational amplifier.
As a further improvement on the present invention, the output of described the first operational amplifier also connects the negative electrode of a light-emitting diode.
As a further improvement on the present invention, described the first divider resistance is 9 with the ratio of the resistance value of the second divider resistance;
As a further improvement on the present invention, described the second divider resistance resistance value is 2K Ω.
As a further improvement on the present invention, the output of described the second operational amplifier also connects the negative electrode of a light-emitting diode.
As a further improvement on the present invention, described the 3rd divider resistance is 18.2 with the ratio of the resistance value of the 4th divider resistance.
As a further improvement on the present invention, described the 4th divider resistance resistance value is 2.5K Ω.
Compared with prior art, the feedback control circuit that LED provided by the present invention drives, can prevent from, because of overtension, LED lamp is caused to damage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing relevant of the present invention in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the hardware of LED driving power in prior art forms structural representation;
Fig. 2 is the feedback control circuit schematic diagram of this embodiment.
Wherein, Reference numeral is:
Current feedback ring, 1; Voltage Feedback ring, 2.
Embodiment
Below with reference to each embodiment shown in the drawings, describe the present invention.But these embodiment do not limit the present invention, the conversion in the structure that those of ordinary skill in the art makes according to these embodiment, method or function is all included in protection scope of the present invention.
Shown in ginseng Fig. 1, feedback control circuit, for adjustable reference source TL431, comprises two operational amplifier A 1 and A2, and operational amplifier A 1 is for Current Control, and operational amplifier A 2 is for voltage control.R1 is output current sampling resistor, and output current produces pressure drop U1 on resistance, and this voltage is provided for the inverting input of amplifier A1, the current-limiting resistance that R11 is inverting input.Adjustable reference source TL431 produces reference voltage 2.5V, by resistance R 4 and R5, carry out dividing potential drop, the voltage U 2 of getting offers the in-phase input end of amplifier A1, U1 and U2 compare and enlarge by amplifier, output voltage signal, voltage is connected to the negative electrode of Guang Said light-emitting diode by D2, control and flow through the electric current in light-emitting diode.The motional impedance of light-emitting diode is lower, and tube voltage drop can be considered as constant.C3, the compensating network that R6 is amplifier.
The value of sampling resistor R1 should be as much as possible little, can raise the efficiency like this, reduces energy loss.In design, to get size be 0.1 Ω to R1, and during steady operation, ohmically pressure drop is 0.25V.The in-phase input end of amplifier A1 is also required to be 0.25V, and R4 and R5 carry out dividing potential drop to reference voltage, according to dividing potential drop relation:
R5/（R4+R5）×2.5V=0.25V
Draw R4=9R5; R4, choosing of R5 need be moderate, and too conference affects the dynamic response of circuit, and too little meeting causes larger power loss, affects the efficiency of circuit.In design, R5 gets 2k Ω, and R4 is adjustable resistance,
C3 and R6 form the compensating network of electric current loop, and compensation components and parts are adjusted according to the practical operation situation of circuit.The general value hundreds of nF of capacitor C 3, the general value tens k Ω of resistance R 6
Resistance R 8 and R9 form bleeder circuit output voltage are sampled, and sampled voltage offers the reverse input end of amplifier A2, and the reference voltage 2.5V that TL431 produces offers the in-phase input end of amplifier.Two voltages compare and enlarge by amplifier, and output voltage signal is controlled and flow through the electric current in light-emitting diode.C4 and R10 have formed the compensating network of amplifier A2.
During steady operation, the voltage of the in-phase input end of amplifier A2 is reference voltage 2.5V.R8 and R9 adopt circuit output voltage, according to dividing potential drop relation:
R9/（R8+R9）=2.5V/48V；
Draw, R8=18.2R9, selecting R9 is 2.5k Ω, R8 is 47k Ω.Be similar to electric current loop, compensation components and parts are adjusted according to the practical operation situation of circuit.The general receipts value hundreds of nF of capacitor C 4, resistance R 10-as value tens k Ω.
The feedback control circuit that LED provided by the invention drives, during driving power normal operation, feedback control circuit only has electric current loop in work.Voltage loop only plays the effect of deboost, prevents from, because output voltage is too high, LED light fixture is caused to damage.
Be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, technical scheme in each execution mode also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
Listed a series of detailed description is above only illustrating for feasibility execution mode of the present invention; they are not in order to limit the scope of the invention, all disengaging within equivalent execution mode that skill spirit of the present invention does or change all should be included in protection scope of the present invention.
Claims (8)
1. the feedback control circuit that a LED drives, FEEDBACK CONTROL for LED driving power adjustable reference power supply, it is characterized in that, comprise a current feedback ring and a Voltage Feedback ring, described current feedback ring comprises one first operational amplifier, the first divider resistance, the second divider resistance, the first compensating resistance, the first building-out capacitor, the first current-limiting resistance, wherein the first divider resistance and the second divider resistance are connected in series in the in-phase input end of the first operational amplifier, the first current-limiting resistance is connected in the inverting input of the first operational amplifier, described the first compensating resistance and the first building-out capacitor are connected in series between the inverting input and output of the first operational amplifier.
2. the feedback control circuit that LED as claimed in claim 1 drives, it is characterized in that, described Voltage Feedback ring, comprise with the second operational amplifier the 3rd divider resistance, the 4th divider resistance, the second building-out capacitor, wherein, the 3rd divider resistance and the 4th divider resistance are connected in series in the second operational amplifier reverse input end, and described the second compensating resistance and the second building-out capacitor are connected in series between the inverting input and output of the second operational amplifier.
3. the feedback control circuit that LED as claimed in claim 2 drives, is characterized in that, the output of described the first operational amplifier also connects the negative electrode of a light-emitting diode.
4. the feedback control circuit that LED as claimed in claim 3 drives, is characterized in that, described the first divider resistance is 9 with the ratio of the resistance value of the second divider resistance.
5. the feedback control circuit that LED as claimed in claim 4 drives, is characterized in that, described the second divider resistance resistance value is 2K Ω.
6. the feedback control circuit that LED as claimed in claim 5 drives, is characterized in that, the output of described the second operational amplifier also connects the negative electrode of a light-emitting diode.
7. the feedback control circuit that LED as claimed in claim 5 drives, is characterized in that, the 3rd divider resistance is 18.2 with the ratio of the resistance value of the 4th divider resistance.
8. the feedback control circuit that LED as claimed in claim 5 drives, is characterized in that, described the 4th divider resistance resistance value is 2.5K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310619291.8A CN103596343A (en) | 2013-11-29 | 2013-11-29 | LED driven feedback control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310619291.8A CN103596343A (en) | 2013-11-29 | 2013-11-29 | LED driven feedback control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103596343A true CN103596343A (en) | 2014-02-19 |
Family
ID=50086270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310619291.8A Pending CN103596343A (en) | 2013-11-29 | 2013-11-29 | LED driven feedback control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103596343A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107077157A (en) * | 2014-07-17 | 2017-08-18 | 克兰电子公司 | Dynamic for multiple control models in unified servo-drive system manipulates configuration |
| US9979285B1 (en) | 2017-10-17 | 2018-05-22 | Crane Electronics, Inc. | Radiation tolerant, analog latch peak current mode control for power converters |
| US10425080B1 (en) | 2018-11-06 | 2019-09-24 | Crane Electronics, Inc. | Magnetic peak current mode control for radiation tolerant active driven synchronous power converters |
| US10477631B2 (en) | 2015-02-05 | 2019-11-12 | Delta Electronics, Inc. | Power circuit applied in LED load |
| WO2020073622A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市崧盛电子股份有限公司 | Feedback loop compensation switching circuit and driving power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932175A (en) * | 2010-08-31 | 2010-12-29 | 电子科技大学 | LED constant current driving circuit capable of dimming automatically |
| CN102548095A (en) * | 2010-12-22 | 2012-07-04 | 海洋王照明科技股份有限公司 | Lamp and driving circuit thereof |
| CN202738222U (en) * | 2012-09-07 | 2013-02-13 | 铱宝电子（苏州）有限公司 | Light-emitting diode driving device |
| CN103179731A (en) * | 2011-12-23 | 2013-06-26 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit and LED lamp |
-
2013
- 2013-11-29 CN CN201310619291.8A patent/CN103596343A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932175A (en) * | 2010-08-31 | 2010-12-29 | 电子科技大学 | LED constant current driving circuit capable of dimming automatically |
| CN102548095A (en) * | 2010-12-22 | 2012-07-04 | 海洋王照明科技股份有限公司 | Lamp and driving circuit thereof |
| CN103179731A (en) * | 2011-12-23 | 2013-06-26 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) driving circuit and LED lamp |
| CN202738222U (en) * | 2012-09-07 | 2013-02-13 | 铱宝电子（苏州）有限公司 | Light-emitting diode driving device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107077157A (en) * | 2014-07-17 | 2017-08-18 | 克兰电子公司 | Dynamic for multiple control models in unified servo-drive system manipulates configuration |
| CN107077157B (en) * | 2014-07-17 | 2018-10-19 | 克兰电子公司 | Dynamic for multiple control models in unified servo-drive system manipulates configuration |
| CN109213244A (en) * | 2014-07-17 | 2019-01-15 | 克兰电子公司 | Dynamic for multiple control models in unified servo-system manipulates configuration |
| CN109213244B (en) * | 2014-07-17 | 2020-12-22 | 克兰电子公司 | Dynamic steering configuration for multiple control modes in a unified servo system |
| US10477631B2 (en) | 2015-02-05 | 2019-11-12 | Delta Electronics, Inc. | Power circuit applied in LED load |
| US9979285B1 (en) | 2017-10-17 | 2018-05-22 | Crane Electronics, Inc. | Radiation tolerant, analog latch peak current mode control for power converters |
| WO2020073622A1 (en) * | 2018-10-08 | 2020-04-16 | 深圳市崧盛电子股份有限公司 | Feedback loop compensation switching circuit and driving power supply |
| US10425080B1 (en) | 2018-11-06 | 2019-09-24 | Crane Electronics, Inc. | Magnetic peak current mode control for radiation tolerant active driven synchronous power converters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103596343A (en) | LED driven feedback control circuit | |
| CN103889111B (en) | The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof | |
| CN101861006A (en) | Dimming control circuit and illumination device | |
| CN205249536U (en) | A cut looks light modulator and maintain current control circuit for cutting power of adjusting luminance mutually | |
| CN104540271B (en) | A kind of self-adaptation type LED drive circuit | |
| CN204350368U (en) | A kind of self-adaptation type LED drive circuit | |
| CN106455193B (en) | LED drive power supply control circuit without auxiliary power supply | |
| CN203039985U (en) | A LED change-over switch circuit using AC sectional driving technology | |
| CN201682667U (en) | Control circuit for automatically tracking driving voltage of LED | |
| CN201682279U (en) | Power-source anti-reverse-connection circuit, LED lamp circuit and LED lamp | |
| CN108055731A (en) | Classroom blackboard LED light strip driving circuit with protective effect | |
| CN104181426A (en) | LED light source load detection circuit for electronic ballast | |
| CN101742772A (en) | Signal indication lamp and LED flashing control circuit | |
| CN203827587U (en) | Large power LED driving circuit | |
| CN203151827U (en) | Ultra-long-life large-current light emitting diode (LED) drive power circuit | |
| CN204090255U (en) | segmented LED drive circuit | |
| CN103002643A (en) | Constant-current drive circuit used for LED (Light Emitting Diode) lamp | |
| CN202634852U (en) | Linear constant-current LED (light-emitting diode) driver | |
| CN201789659U (en) | LED drive circuit | |
| CN205946265U (en) | Linear constant -current drive circuit of full voltage LED | |
| CN104853505A (en) | Energy-saving power amplification type grid driving system based on gate driving | |
| CN204335127U (en) | A kind of novel xenon lamp power supply system | |
| CN204795774U (en) | A light circuit for electric power overhauld night | |
| CN104219854B (en) | A kind of multiple-channel output height blood pressure lowering LED constant current drives power supply | |
| CN203015238U (en) | Off-line LED driving power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140219 |