CN204948475U - A kind of LED constant-current control circuit - Google Patents
A kind of LED constant-current control circuit Download PDFInfo
- Publication number
- CN204948475U CN204948475U CN201520775365.1U CN201520775365U CN204948475U CN 204948475 U CN204948475 U CN 204948475U CN 201520775365 U CN201520775365 U CN 201520775365U CN 204948475 U CN204948475 U CN 204948475U
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- connects
- led
- light source
- exciting converter
- anti exciting
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model provides a kind of LED constant-current control circuit, mainly comprise rectification filtering module, IC controller, anti exciting converter, comparator, thermistor, the Same Name of Ends of anti exciting converter former limit inductance connects the output of rectification filtering module, the different name end of anti exciting converter former limit inductance connects the drain electrode of field-effect transistor, the grid of field-effect transistor connects IC controller output end, the different name end of anti exciting converter secondary inductance connects the positive pole of LED light source, the Same Name of Ends of anti exciting converter secondary inductance connects the negative pole of LED light source by resistance, the utility model structural principle is simple, current constant control can be realized, saves energy, can also automatically control LED light source temperature simultaneously, prevent from causing LED light source light decay, extend the useful life of LED light source.
Description
Technical field:
The utility model relates to LED field, particularly relates to a kind of LED constant-current control circuit.
Background technology:
LED, light-emitting diode is a kind of can be the solid-state semiconductor device of visible ray by electric energy conversion, and it directly can be converted into light electricity.The heart of LED is the wafer of a semiconductor, and one end of wafer is attached on a support, and one end is negative pole, and the other end connects the positive pole of power supply, makes whole wafer by epoxy encapsulation.Semiconductor wafer is made up of two parts, and a part is P type semiconductor, and inside it, occupy an leading position in hole, and the other end is N type semiconductor, at this side mainly electronics.But time these two kinds of semiconductors couple together, between them, just form a P-N junction.When electric current acts on this wafer by wire time, electronics will be pushed to P district, and in P district, electronics is with hole-recombination, then will send energy with the form of photon, the principle of LED luminescence that Here it is.And the wavelength of light i.e. the color of light, be determined by the material forming P-N junction.
LED is current mode device, the stability of brightness when constant-current drive circuit is for ensureing that LED works, and extend its useful life, the constant-current drive circuit of prior art comprises multiple capacitor element usually, cause shorten the useful life of LED, and during LED work, temperature can rise, if LED temperature can not be controlled, LED light decay can be caused.
Utility model content:
In order to solve the problem, it is simple that the utility model provides a kind of structural principle, can realize current constant control, saves energy, can also automatically control LED light source temperature simultaneously, prevent from causing LED light source light decay, extends the technical scheme in the useful life of LED light source:
A kind of LED constant-current control circuit, mainly comprise rectification filtering module, IC controller, anti exciting converter, comparator, thermistor, the Same Name of Ends of anti exciting converter former limit inductance connects the output of rectification filtering module, the different name end of anti exciting converter former limit inductance connects the drain electrode of field-effect transistor, the different name end of anti exciting converter secondary inductance connects the positive pole of LED light source, and the Same Name of Ends of anti exciting converter secondary inductance connects the negative pole of LED light source by resistance B.
As preferably, the source class of field-effect transistor is by resistance A ground connection, and the grid of field-effect transistor connects IC controller output end; IC controller one end connects the output of comparator by photoelectrical coupler; An input of comparator is by resistance C contact resistance B one end; Another input of comparator connects reference voltage terminal by resistance D.
As preferably, IC controller is provided with an I/O end, the 2nd I/O end, the 3rd I/O end, and an I/O end connects thermistor one end, and the 2nd I/O holds contact resistance E one end, and the 3rd I/O end connects electric capacity A and ground connection; The thermistor other end contact resistance E other end series capacitance A.
As preferably, LED light source is in series by several LED, and each LED is parallel with conducting chip.
The beneficial effects of the utility model are:
(1) the utility model structural principle is simple, can realize current constant control, saves energy.
(2) the utility model adopts conducting chip parallel connection LED lamp, when LED breaks down, still can ensure that LED light source normally works.
(3) the utility model adopts IC controller to connect thermistor, realizes the object of collecting temperature data, can automatically control LED light source temperature, prevent from causing LED light source light decay, extends the useful life of LED light source.
Accompanying drawing illustrates:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment:
For making goal of the invention of the present utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, execution mode of the present utility model is described in further detail.
As shown in Figure 1, a kind of LED constant-current control circuit, mainly comprise rectification filtering module 1, IC controller 2, anti exciting converter 3, comparator 4, thermistor 5, the Same Name of Ends of anti exciting converter 3 former limit inductance connects the output of rectification filtering module 1, the different name end of anti exciting converter 3 former limit inductance connects the drain electrode of field-effect transistor 6, the different name end of anti exciting converter 3 secondary inductance connects the positive pole of LED light source 7, and the Same Name of Ends of anti exciting converter 3 secondary inductance connects the negative pole of LED light source 7 by resistance B2a.LED light source 7 is in series by several LED 71, and each LED 71 is parallel with conducting chip 72, adopts conducting chip parallel connection LED lamp, when LED breaks down, still can ensure that LED light source normally works.
The source class of field-effect transistor 6 is by resistance A1a ground connection, and the grid of field-effect transistor 6 connects IC controller 2 output; IC controller 2 one end connects the output of comparator 4 by photoelectrical coupler 8; An input of comparator 4 is by resistance C3a contact resistance B2a one end; Another input of comparator 4 connects reference voltage terminal by resistance D4a.
IC controller 2 is provided with I/O end the 21, the 2nd I/O end the 22, the 3rd I/O end the 23, an one I/O end 21 and connects thermistor 5 one end, and the 2nd I/O holds 22 contact resistance E5a one end, and the 3rd I/O end 23 connects electric capacity A1d and ground connection; Thermistor 5 other end contact resistance E5a other end series capacitance A1d.
Operation principle: input power powers up through the primary coil winding of rectification filtering module 1 pair of anti exciting converter 2, when field-effect transistor 6 conducting, primary coil winding has electric current to flow through, while primary coil two ends produce self induction electromotive force, also produce induced electromotive force at the two ends of the secondary coil winding of anti exciting converter 3 simultaneously, due to the acting in opposition of LED, loop current can not be produced, LED does not work, when field-effect transistor 6 turns off suddenly, at the beginning of anti exciting converter 3, secondary coil loop will produce the reverse induction electromotive force of infinite height, make LED forward conduction, LED light source 7 is luminous, when input voltage changes, or during output current shakiness, pressure drop on resistance B2a will change, comparator 4 will export the linear change that a comparison signal removes to control photoelectrical coupler 8, IC controller 2 is delivered to through photoelectrical coupler 8 coupling, regulate the duty ratio of pwm signal, thus change the conducting turn-off time of field-effect transistor 6, final realization is to the current constant control of LED, during LED work, temperature constantly rises, IC controller 2 the one I/O holds 21 constantly to detect E Wendu on thermistor 5, temperature constantly rises, thermistor 5 resistance constantly declines, when the resistance dropping to ratio resistance E5a is also little, the temperature compensation function of IC controller 2 starts, electric capacity A1d is constantly charged, IC controller 2 output current can constantly reduce, thus control LED light source temperature, prevent from causing LED light source light decay, extend the useful life of LED light source.
Above-described embodiment is preferred embodiment of the present utility model; it is not the restriction to technical solutions of the utility model; as long as without the technical scheme that creative work can realize on the basis of above-described embodiment, all should be considered as falling within the scope of the rights protection of the utility model patent.
Claims (4)
1. a LED constant-current control circuit, it is characterized in that: mainly comprise rectification filtering module, IC controller, anti exciting converter, comparator, thermistor, the Same Name of Ends of described anti exciting converter former limit inductance connects the output of described rectification filtering module, the different name end of described anti exciting converter former limit inductance connects the drain electrode of field-effect transistor, the different name end of described anti exciting converter secondary inductance connects the positive pole of LED light source, and the Same Name of Ends of described anti exciting converter secondary inductance connects the negative pole of LED light source by resistance B.
2. a kind of LED constant-current control circuit according to claim 1, is characterized in that: the source class of described field-effect transistor is by resistance A ground connection, and the grid of described field-effect transistor connects described IC controller output end;
Described IC controller one end connects the output of described comparator by photoelectrical coupler;
An input of described comparator is by resistance C contact resistance B one end;
Another input of described comparator connects reference voltage terminal by resistance D.
3. a kind of LED constant-current control circuit according to claim 1, it is characterized in that: described IC controller is provided with an I/O end, the 2nd I/O end, the 3rd I/O end, one I/O end connects thermistor one end, and the 2nd I/O holds contact resistance E one end, and the 3rd I/O end connects electric capacity A and ground connection;
The thermistor other end contact resistance E other end series capacitance A.
4. a kind of LED constant-current control circuit according to claim 1, it is characterized in that: described LED light source is in series by several LED, and each LED is parallel with conducting chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520775365.1U CN204948475U (en) | 2015-10-09 | 2015-10-09 | A kind of LED constant-current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520775365.1U CN204948475U (en) | 2015-10-09 | 2015-10-09 | A kind of LED constant-current control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204948475U true CN204948475U (en) | 2016-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520775365.1U Expired - Fee Related CN204948475U (en) | 2015-10-09 | 2015-10-09 | A kind of LED constant-current control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204948475U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846758A (en) * | 2017-12-11 | 2018-03-27 | 伊婕 | A kind of special temperature-control circuit of low-power consumption teaching equipment |
| CN116961448A (en) * | 2023-09-21 | 2023-10-27 | 深圳市鑫讯霆通信设备有限公司 | Digital control system based on high-voltage gallium nitride flyback AC/DC converter |
-
2015
- 2015-10-09 CN CN201520775365.1U patent/CN204948475U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846758A (en) * | 2017-12-11 | 2018-03-27 | 伊婕 | A kind of special temperature-control circuit of low-power consumption teaching equipment |
| CN107846758B (en) * | 2017-12-11 | 2019-11-12 | 周凤菊 | A kind of dedicated temperature-control circuit of low-power consumption teaching equipment |
| CN116961448A (en) * | 2023-09-21 | 2023-10-27 | 深圳市鑫讯霆通信设备有限公司 | Digital control system based on high-voltage gallium nitride flyback AC/DC converter |
| CN116961448B (en) * | 2023-09-21 | 2024-01-09 | 深圳市鑫讯霆通信设备有限公司 | Digital control system based on high-voltage gallium nitride flyback AC/DC converter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20171009 |