CN201097468Y - LED light source circuit - Google Patents
LED light source circuit Download PDFInfo
- Publication number
- CN201097468Y CN201097468Y CNU2007200219141U2007200219141U CN200720021914U CN201097468Y CN 201097468 Y CN201097468 Y CN 201097468Y CN U2007200219141U2007200219141 U CNU2007200219141U2007200219141 U CN U2007200219141U2007200219141U CN 200720021914 U CN200720021914 U CN 200720021914U CN 201097468 Y CN201097468 Y CN 201097468Y
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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
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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Abstract
The utility model discloses a LED light source circuit, providing a light source circuit with reliable and stable light quality, energy saving, environmental protection, high light efficiency, and long service life. The utility model is characterized in that: a reference voltage constant-current source circuit 1 is connected with a reference voltage source 2; the reference voltage source 2 is connected with a light adjusting circuit 3 and a strong light temperature compensation circuit 8; the light adjusting circuit 3 is connected with a weak light temperature compensation circuit 7 and a LED group constant-current source circuit 6; a LED group 4 is connected with the LED group constant-current source circuit 6; a parallel branch circuit 5 is connected with the light adjusting circuit 3. The LED used in the LED light source circuit is suitable for LEDs which emits various colors, and also suitable for LEDs with various powers. The utility model can be widely applied in street lamps, garden lamps, indoor illuminating lamps, landscape lamps and automotive lamps.
Description
Technical field:
The utility model relates to a kind of circuit of light sources, particularly a kind ofly is combined into by light-emitting diode and portions of electronics components and parts, is used to throw light on, decorate or indicate the circuit of light sources of certain signal.
Background technology:
The led light source circuit exists design complicated at present, defectives such as interchangeability, versatility difference, and the led light source circuit that has when using AC network to do power supply, is not resolved the isolation of LED and line voltage, causes potential safety hazard.The led light source circuit that has does not design dimming function, makes troubles to use.The led light source circuit that has, drive efficiency is low, and the cost height is unfavorable for applying.
Summary of the invention:
The utility model provides a kind of led light source circuit succinct, that fail safe is good, cost is low, interchangeability is good of constructing in order to remedy the deficiencies in the prior art.
The utility model is achieved by the following technical solution:
Led light source circuit of the present utility model, its special character is: in the circuit, the reference voltage constant-current source circuit connects reference voltage source; Reference voltage source connects light adjusting circuit and high light temperature-compensation circuit; Light adjusting circuit connects low light level temperature-compensation circuit and diode group constant-current source circuit; Light-emitting diode group is connected with the light-emitting diode group constant-current source circuit; The light-emitting diode group constant-current source circuit is connected with light adjusting circuit; In the parallel branch, a luminous tube positive pole is connected with supply voltage, and the constant current control end is connected with light adjusting circuit, and the other end is connected with ground.
Led light source circuit of the present utility model, described reference voltage constant-current source circuit is made up of two resistance, voltage-stabiliser tube, triodes; Voltage-stabiliser tube one termination power positive pole, resistance of another termination; Another resistance one end links to each other with positive source, and the other end links to each other with the emitter of triode; One end of the base stage of triode and resistance links to each other, and its collector electrode links to each other with reference voltage source; One end of resistance links to each other with voltage-stabiliser tube, other end ground connection.
Led light source circuit of the present utility model, described reference voltage source is made up of an integrated circuit accurate reference voltage or a voltage reference diode, its a termination high light temperature-compensation circuit, the other end links to each other with the collector electrode of triode.
Led light source circuit of the present utility model, described light adjusting circuit is made up of three resistance, adjustable resistance, electric capacity, triodes; One end of resistance and electric capacity links to each other with ground, and the other end back that links to each other links to each other with the emitter of triode; The base stage of triode links to each other with the movable contact of adjustable resistance, and an end of the collector electrode of triode and another resistance links to each other; One end of this resistance links to each other with the collector electrode of triode, and the other end links to each other with positive source; The movable contact of adjustable resistance links to each other with the base stage of triode, and the positive pole with the diode of low light level temperature-compensation circuit in two contacts links to each other in addition, and another links to each other with resistance; One end of this resistance links to each other with adjustable resistance, and the collector electrode of the other end and triode links to each other.
Led light source circuit of the present utility model, described low light level temperature-compensation circuit is made up of two diodes, and the positive pole of a diode connects adjustable resistance, and its negative pole connects the positive pole of another diode, the minus earth of another diode.
Led light source circuit of the present utility model, described high light temperature-compensation circuit is made up of two diodes, and the positive pole of a diode connects reference voltage source, and its negative pole connects the positive pole of another diode, the minus earth of another diode.
Led light source circuit of the present utility model, described light-emitting diode group is formed by connecting by light-emitting diode, and topmost the positive pole of light-emitting diode links to each other with positive source, and the negative pole of light-emitting diode links to each other with the collector electrode of triode bottom.
Led light source circuit of the present utility model, described light-emitting diode group constant-current source circuit is made up of triode, resistance; The base stage of triode links to each other with the emitter of another triode, and the collector electrode of triode links to each other with a light-emitting diode negative pole of light-emitting diode group, and the emitter of triode links to each other with resistance, and the other end of resistance links to each other with ground.
In the technical solution of the utility model, realize dimming function with an adjustable resistance, not only regulation and control are effective, and structure is succinct, with low cost, are easy to realize.Voltage-stabiliser tube, diode, light-emitting diode all belong to the PN junction electron-like components and parts to the variations in temperature sensitivity, the utility model at light source under luminous strong and luminous weak two kinds of situations, by temperature-compensation circuit, the stability of intensifier circuit.Also, improve the voltage regulation performance of voltage-stabiliser tube, thereby promote the stability of whole light source circuit by the method for constant current is provided for voltage-stabiliser tube.
Advantage of the present utility model and good effect are: this programme selector switch stabilized voltage power supply obtains constant voltage dc source from AC network, because the ac input end and the dc output end of Switching Power Supply are isolated fully, not only cost is low, and fail safe, interchangeability are good.Reference voltage constant-current source circuit 1, reference voltage source 2, light adjusting circuit 3, light-emitting diode group 4, light-emitting diode group constant-current source circuit 6, low light level temperature-compensation circuit 7, the high light temperature-compensation circuit 8 of this programme design, all coincidence circuit structure is succinct, efficient is high, cost is low, is easy to processing and promotes the use of.
Description of drawings:
Figure one is the utility model led light source circuit diagram
1-reference voltage constant-current source circuit among the figure, 2-reference voltage source, 3-light adjusting circuit, 4-light-emitting diode group, 5-parallel branch, 6-light-emitting diode group constant-current source circuit, 7-low light level temperature-compensation circuit, 8-high light temperature-compensation circuit.
Embodiment:
Below in conjunction with accompanying drawing the utility model is described further:
Shown in figure one: described reference voltage constant-current source circuit 1 is made up of resistance R 1 and R2, voltage-stabiliser tube W1 and triode T1; The anodal Vc of voltage-stabiliser tube W1 one termination power, other end connecting resistance R2.Resistance R 1 one ends link to each other with positive source Vc, and the other end links to each other with the emitter of triode T1; One end of the base stage of triode T1 and resistance R 2 links to each other, and its collector electrode links to each other with reference voltage source W2; One end of resistance R 2 links to each other with voltage-stabiliser tube W1, other end ground connection.
Described reference voltage source 2 is made up of an integrated circuit accurate reference voltage or a voltage reference diode; An its termination high light temperature-compensation circuit, the other end links to each other with the collector electrode of triode T1.
Described light adjusting circuit 3 is made up of resistance R 3, resistance R 5, resistance R 6, adjustable resistance R4, capacitor C 1, triode T2; One end of resistance R 6 and capacitor C 1 links to each other with ground, and the other end links to each other with the emitter of triode T2 after linking to each other; The base stage of triode T2 links to each other with the movable contact of adjustable resistance R4, and an end of the collector electrode of triode T2 and resistance R 5 links to each other; One end of resistance R 5 links to each other with the collector electrode of triode T2, and the other end links to each other with positive source Vc; The movable contact of adjustable resistance R4 links to each other with the base stage of triode T2, and the positive pole with low light level temperature compensated diode D1 in two contacts links to each other in addition, and another links to each other with resistance R 3; One end of resistance R 3 links to each other with adjustable resistance R4, and the other end links to each other with the collector electrode of triode T1.
Described light-emitting diode group 4 is formed by connecting by light-emitting diode, and topmost the positive pole of light-emitting diode links to each other with positive source Vc, and the negative pole of light-emitting diode links to each other with the collector electrode of triode T3 bottom.
Described parallel branch 5, its structure and line are equal to the combination with light-emitting diode group 4 and light-emitting diode group constant-current source circuit 6 fully.
Described light-emitting diode group constant-current source circuit 6 is made up of triode T3, resistance R 7; The base stage of triode T3 links to each other with the emitter of triode T2, and the collector electrode of triode T3 links to each other with the negative pole of a light-emitting diode of light-emitting diode group 4, and the emitter of triode T3 links to each other with resistance R 7, and the other end of resistance R 7 links to each other with ground.
Described low light level temperature-compensation circuit 7 is made up of diode D1, diode D2; The positive pole of diode D1 meets adjustable resistance R4, and its negative pole connects the positive pole of diode D2, the minus earth of diode D2.
Described high light temperature-compensation circuit 8 is made up of diode D3, diode D4; The positive pole of diode D3 meets reference voltage source W2, and its negative pole connects the positive pole of diode D4, the minus earth of diode D4.
The concise and to the point course of work of described led light source circuit is: in reference voltage constant-current source circuit 1, the base voltage of triode T1 equals the tube voltage drop of voltage-stabiliser tube W1, and the collector current of triode T1 equals (tube voltage drop of voltage-stabiliser tube W1-triode T1 base-emitter voltage falls) ÷ resistance R 1.When ambient temperature constant, when having only supply voltage Vc to change, because of tube voltage drop, the triode T1 base-emitter voltage of voltage-stabiliser tube W1 falls, resistance R 1 resistance can not become, so the collector current of triode T1 is constant current, form emitter follower circuit because of triode T2, resistance R 3, adjustable resistance R4, resistance R 6 again, the resistance of adjustable resistance R4 is also bigger, make the collector current of triode T1 keep constant-current characteristics, therefore when supply voltage Vc changed, the B point current potential of reference voltage source 2 was stablized constant.Constant because of ambient temperature again, the base potential of triode T2 and T3, emitter current potential can not change, and the emitter current potential that the electric current that flows through light-emitting diode group 4 equals triode T3 removes in resistance R 7, and this electric current also will be stablized constant.Brief description is the course of work when variation of ambient temperature, suppose that original ambient temperature is A ℃, changing the back ambient temperature is D ℃, variations in temperature is for raising (D ℃-A ℃), establish R3=0 again, the cursor slide of R4 moves to topmost, because of diode D1, D2, D3, D4, between the base stage and emitter of triode T2 and T3, its internal structure all is a PN junction, and the temperature characterisitic of PN junction is that a PN junction is when electric current flows through, 1 ℃ of the every rising of ambient temperature (or reduction), its voltage drop will reduce (or rising) about 2 millivolts.Therefore, ambient temperature is upgraded to D ℃, will cause the variation of three aspects; First aspect is because the influence of diode D3, D4, and B point current potential will descend (D ℃-A ℃) * 4 millivolts, and this will cause the electric current minimizing of flowing through light-emitting diode group 4, and minimizing numerical value is, (D ℃-A ℃) * 4 ÷ R7; Second aspect will cause that the base stage of triode T2 and T3 and the voltage drop between emitter reduce (D ℃-A ℃) * 4 millivolts, and this will cause that the electric current that flows through light-emitting diode group 4 increases, and increase numerical value to be (D ℃-A ℃) * 4 ÷ R7; The third aspect will cause that diode D1, D2 voltage drop reduce (D ℃-A ℃) * 4 millivolts, but this can not change the electric current that flows through light-emitting diode group 4.Because at this moment, the movable contact of resistance R 4 is in topmost, and R3=0, the B point equipotential of the base stage of triode T2 and reference voltage source 2.The variation of comprehensive this three aspect, the electric current that finally flows through light-emitting diode group 4 is constant.Can prove that by same analytical method when ambient temperature descended, the electric current that flows through light-emitting diode group 4 was constant equally.Movable contact in R3＞0 and resistance R 4 is not when being in topmost, diode D3, D4 are to stabilized illumination diode group 4 electric currents that variation of ambient temperature play a part, because of the dividing potential drop of resistance R 3, R4 is slackened, diode D1, D2 but slacken along with this, strengthened the effect of stabilized illumination diode group 4 electric currents, the electric current that at this moment flows through light-emitting diode group 4 still has good constant-current characteristics.In the light adjusting circuit 3, the movable contact of adjustable resistance R4 links to each other with the base stage of triode T2, when movable contact moves up, the base potential of triode T2 raises, cause that D point current potential raises, because of the collector current of triode T3 equals (D point voltage-T3 base-emitter voltage falls)-R7, so the rising of D point current potential, cause that the collector current of triode T3 just flows through the electric current increase of light-emitting diode group 4, the increase of electric current causes that light-emitting diode group 4 luminous intensities increase.Otherwise the movable contact of adjustable resistance R4 moves down, and will cause weakening of luminous intensity.The effect of capacitor C 1 is the high-frequency alternating current that may introduce in the short circuit current.When luminous power is very big, must cause a lot of parallel branch 5 in parallel, each branch road all needs to provide Control current for its light-emitting diode group constant-current source circuit, so Duo Control current pools together, make the collector current of triode T2 also can be bigger, cause triode T2 dissipation power bigger, the effect of resistance R 5, reduce the dissipation power of triode T2 exactly, the design of resistance R 5 resistance sizes, voltage drop in the time of must guaranteeing triode T2 work between its collector and emitter is not less than 1 volt, guarantees that triode T2 is operated in the amplification region.So the resistance value of resistance R 5 is variablees, when luminous power was big, its resistance was less, luminous power hour, and its resistance is bigger, and when luminous power was very little, resistance R 5 could.In the light-emitting diode group 4, the number of light-emitting diode is mainly determined by following formula: supply voltage Vc＞=(voltage drops of light-emitting diode group 4 operate as normal)+(minimum voltage drop of its light-emitting diode group constant-current source circuit 6 energy operate as normal).After supply voltage Vc determines, satisfy following formula by the light-emitting diode number that increases or reduce in the light-emitting diode group 4.
Claims (8)
1. led light source circuit is characterized in that: in the circuit, reference voltage constant-current source circuit (1) connects reference voltage source (2); Reference voltage source (2) connects light adjusting circuit (3) and high light temperature-compensation circuit (8); Light adjusting circuit (3) connects low light level temperature-compensation circuit (7) and diode group constant-current source circuit (6); Light-emitting diode group (4) is connected with light-emitting diode group constant-current source circuit (6); Light-emitting diode group constant-current source circuit (6) is connected with light adjusting circuit (3); In the parallel branch (5), a luminous tube positive pole is connected with supply voltage (Vc), and the constant current control end is connected with light adjusting circuit (3), and the other end is connected with ground.
2. led light source circuit according to claim 1 is characterized in that: described reference voltage constant-current source circuit (1) is made up of resistance (R1) and resistance (R2), voltage-stabiliser tube (W1), triode (T1); Voltage-stabiliser tube (W1) termination power positive pole (Vc), other end connecting resistance (R2); Resistance (R1) end links to each other with positive source (Vc), and the other end links to each other with the emitter of triode (T1); The base stage of triode (T1) links to each other with an end of resistance (R2), and its collector electrode links to each other with reference voltage source (W2); One end of resistance (R2) links to each other other end ground connection with voltage-stabiliser tube (W1).
3. led light source circuit according to claim 1, it is characterized in that: described reference voltage source (2) is made up of an integrated circuit accurate reference voltage or a voltage reference diode, an its termination high light temperature-compensation circuit (8), the other end links to each other with the collector electrode of triode (T1).
4. led light source circuit according to claim 1 is characterized in that: described light adjusting circuit (3) is made up of resistance (R3), resistance (R5), resistance (R6), adjustable resistance (R4), electric capacity (C1), triode (T2); Resistance (R6) links to each other with ground with an end of electric capacity (C1), and the other end links to each other with the emitter of triode (T2) after linking to each other; The base stage of triode (T2) links to each other with the movable contact of adjustable resistance (R4), and the collector electrode of triode (T2) links to each other with an end of resistance (R5); One end of resistance (R5) links to each other with the collector electrode of triode (T2), and the other end links to each other with positive source (Vc); The movable contact of adjustable resistance (R4) links to each other with the base stage of triode (T2), and the positive pole with the diode (D1) of low light level temperature-compensation circuit (7) in two contacts links to each other in addition, and another links to each other with resistance (R3); One end of resistance (R3) links to each other with adjustable resistance (R4), and the other end links to each other with the collector electrode of triode (T1).
5. led light source circuit according to claim 1, it is characterized in that: described low light level temperature-compensation circuit (7) is made up of diode (D1), diode (D2), the positive pole of diode (D1) connects adjustable resistance (R4), its negative pole connects the positive pole of diode (D2), the minus earth of diode (D2).
6. led light source circuit according to claim 1, it is characterized in that: described high light temperature-compensation circuit (8) is made up of diode (D3), diode (D4), the positive pole of diode (D3) connects reference voltage source (W2), its negative pole connects the positive pole of diode (D4), the minus earth of diode (D4).
7. led light source circuit according to claim 1, it is characterized in that: described light-emitting diode group (4), be formed by connecting by light-emitting diode, topmost the positive pole of light-emitting diode links to each other with positive source (Vc), and the negative pole of light-emitting diode links to each other with the collector electrode of triode (T3) bottom.
8. led light source circuit according to claim 1 is characterized in that: described light-emitting diode group constant-current source circuit (6) is made up of triode (T3), resistance (R7); The base stage of triode (T3) links to each other with the emitter of triode (T2), the collector electrode of triode (T3) links to each other with a light-emitting diode negative pole of light-emitting diode group (4), the emitter of triode (T3) links to each other with resistance (R7), and the other end of resistance (R7) links to each other with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200219141U2007200219141U CN201097468Y (en) | 2007-05-09 | 2007-05-09 | LED light source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200219141U2007200219141U CN201097468Y (en) | 2007-05-09 | 2007-05-09 | LED light source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201097468Y true CN201097468Y (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200219141U2007200219141U Expired - Fee Related CN201097468Y (en) | 2007-05-09 | 2007-05-09 | LED light source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201097468Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052206A (en) * | 2011-10-14 | 2013-04-17 | 成都锐奕信息技术有限公司 | Controller for LED (Light Emitting Diode) luminance |
| CN103179730A (en) * | 2011-12-23 | 2013-06-26 | 海洋王照明科技股份有限公司 | Dimming control circuit, dimming control device and lamp |
| CN104010423A (en) * | 2014-06-16 | 2014-08-27 | 新昌县博阳照明有限公司 | LED linear stepless dimming circuit |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| WO2020238301A1 (en) * | 2019-05-24 | 2020-12-03 | 深圳市晟碟半导体有限公司 | Led dimming circuit, dimming device, and dimming method |
-
2007
- 2007-05-09 CN CNU2007200219141U2007200219141U patent/CN201097468Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103052206A (en) * | 2011-10-14 | 2013-04-17 | 成都锐奕信息技术有限公司 | Controller for LED (Light Emitting Diode) luminance |
| CN103179730A (en) * | 2011-12-23 | 2013-06-26 | 海洋王照明科技股份有限公司 | Dimming control circuit, dimming control device and lamp |
| CN104010423A (en) * | 2014-06-16 | 2014-08-27 | 新昌县博阳照明有限公司 | LED linear stepless dimming circuit |
| CN106793279A (en) * | 2016-12-13 | 2017-05-31 | 四川长虹电子部品有限公司 | A kind of adjustable constant current output power module and implementation method |
| CN106793279B (en) * | 2016-12-13 | 2019-09-13 | 四川虹锐电工有限责任公司 | A kind of adjustable constant current output power module and implementation method |
| WO2020238301A1 (en) * | 2019-05-24 | 2020-12-03 | 深圳市晟碟半导体有限公司 | Led dimming circuit, dimming device, and dimming method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20110509 |