CN205584546U - LED constant -current source circuit - Google Patents
LED constant -current source circuit Download PDFInfo
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- CN205584546U CN205584546U CN201620177969.0U CN201620177969U CN205584546U CN 205584546 U CN205584546 U CN 205584546U CN 201620177969 U CN201620177969 U CN 201620177969U CN 205584546 U CN205584546 U CN 205584546U
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Abstract
The utility model discloses a LED constant -current source circuit, including resistance R1, R2, R3, R1, R5, R6, R7, R8, electric capacity C1, C2, rectifier bridge D1, stabilivolt U1, triode Q1, R1 and C1 parallel connection, constant current source circuit input end is connected to one end, and D1 is connected to the other end, the anodal first pin of D1 of connecting of C2, the fourth pin is connected to the negative pole, the first pin of D1, R6 are connected respectively to R2 one end, and R3, R8, U1 output are connected respectively to the other end, R8, C2 negative pole, D1 fourth pin, U1 input, R5, R7 connect ground respectively, U1 common port, R5, R7 are connected respectively to the Q1 projecting pole. The utility model discloses a constant -current source circuit is simple, and output is stable, and with low costs, the price / performance ratio is very high.
Description
Technical field
This utility model relates to LED circuit, is specifically related to a kind of LED constant-current source circuit.
Background technology
The advantages such as current LED illumination collection low-power consumption, long-life, the most very popular.Along with the continuous decline of price, LED has started to be applied in domestic lighting.36,60 LED that market is sold at present, power consumption only about 3w, brightness is equivalent to 10w electric filament lamp, very power saving.After using a period of time, find that light decay ratio is more serious.Its circuit is very simple, and employing is all capacity voltage dropping circuit.Although capacitance decompression belongs to constant current source, but is equivalent to short circuit at booting moment electric capacity, curent change is very big, and when line voltage is widely varied, curent change is the biggest.Reason is the light decay that the electric current of wide variation result in LED.The LED drive integrated circult of specialty brings a high price, and mostly is low voltage DC/DC power supply mode.
Summary of the invention
This utility model is for the problems referred to above, it is provided that a kind of LED constant-current source circuit, including resistance R1, R2, R3, R1, R5, R6, R7, R8, electric capacity C1, C2, rectifier bridge D1, stabilivolt U1, audion Q1；Described R1 with C1 is connected in parallel, and one end connects constant-current source circuit input, and the other end connects D1；Described C2 positive pole connects D1 the first pin, and negative pole connects the 4th pin；Described R2 one end connects D1 the first pin, R6 respectively, and the other end connects R3, R8, U1 outfan respectively；Described R8, C2 negative pole, D1 the 4th pin, U1 input, R5, R7 connect ground respectively；Described Q1 emitter stage connects U1 common port, R5, R7 respectively.
Further, described electric capacity C2 is 2.2uF～4.7uF, and pressure voltage is the electrochemical capacitor of 400V.
Further, described electric capacity C1 is the electric capacity of 0.47uF.
Further, described resistance R5 is the R5 in 240 Europe.
Further, described constant-current source circuit is the constant-current source circuit of output constant current 10mA.
Advantage of the present utility model:
Constant-current source circuit of the present utility model is simple, and output is stable, and low cost, cost performance is the highest.
In addition to objects, features and advantages described above, this utility model also has other objects, features and advantages.Below with reference to figure, this utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing of the part constituting the application is used for providing being further appreciated by of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.
Fig. 1 is the schematic diagram of this utility model embodiment.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
With reference to Fig. 1, a kind of LED constant-current source circuit as shown in Figure 1, including resistance R1, R2, R3, R1, R5, R6, R7, R8, electric capacity C1, C2, rectifier bridge D1, stabilivolt U1, audion Q1；Described R1 with C1 is connected in parallel, and one end connects constant-current source circuit input, and the other end connects D1；Described C2 positive pole connects D1 the first pin, and negative pole connects the 4th pin；Described R2 one end connects D1 the first pin, R6 respectively, and the other end connects R3, R8, U1 outfan respectively；Described R8, C2 negative pole, D1 the 4th pin, U1 input, R5, R7 connect ground respectively；Described Q1 emitter stage connects U1 common port, R5, R7 respectively.
Described electric capacity C2 is 2.2uF～4.7uF, and pressure voltage is the electrochemical capacitor of 400V.
Described electric capacity C1 is the electric capacity of 0.47uF.
Described resistance R5 is the R5 in 240 Europe.
Described constant-current source circuit is the constant-current source circuit of output constant current 10mA.
LED constant-current source circuit of the present utility model, C1, R1, D1, C2 therein form AC/DC change-over circuit, wherein C=1/2 π f U=(0.0000145) I, and unit is farad.If taking I=10mA, C1=0.15 μ F, the actual C1 of choosing are the Urm >=400v of 0.47uF.D1 rectifier bridge, or select 4 1N4004 or IN4007 commutation diode composition rectifier bridges: filter capacitor C2 takes 2.2uF～4.7uF, the pressure electrochemical capacitor for 400V.Constant-current source circuit is made up of R2, U1, R3, R5, Q1.Q1 be the MJE13001.R5 of pressure UceBR >=40DV be current sampling resistor, also it is the Current Negative Three-Point Capacitance resistance of Q1, the size of regulation R5 can change the operating current of LED, thus changes the brightness mouth Io=Uref/R5=2.5/R5 of LED, the ID=10mA as R5=240 Ω.
If operation principle is as follows. input voltage raises, output electric current Io is made to increase, simultaneously the voltage Ur5 on R5 thus cause the ascending change of voltage of TL431 the first foot, the anode current making TL431 increases, Uk declines, and makes audion Q1 base voltage decline, and Ube decline causes Ic to decline, thus the electric current that keeps flow through light emitting diode is constant, reach the purpose of constant current.
Foregoing circuit Multisim 10 software emulates, and when defeated people's voltage changes between 180v～250v, electric current is that 10mA keeps constant.After emulation terminates, installing circuit and carry out actual debugging on universal plate, result is close with emulation.By continuous print work experiment, effect is pretty good.
Constant-current source circuit of the present utility model is simple, and output is stable, and low cost, cost performance is the highest.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (5)
1. a LED constant-current source circuit, it is characterised in that include resistance R1, R2, R3, R1, R5,
R6, R7, R8, electric capacity C1, C2, rectifier bridge D1, stabilivolt U1, audion Q1；Described R1 with C1 is connected in parallel, and one end connects constant-current source circuit input, and the other end connects D1；Described C2 positive pole connects D1 the first pin, and negative pole connects the 4th pin；Described R2 one end connects D1 the first pin, R6 respectively, and the other end connects R3, R8, U1 outfan respectively；Described R8, C2 negative pole, D1 the 4th pin, U1 input, R5, R7 connect ground respectively；Described Q1 emitter stage connects U1 common port, R5, R7 respectively.
LED constant-current source circuit the most according to claim 1, it is characterised in that described electric capacity C2 is 2.2uF～4.7uF, pressure voltage is the electrochemical capacitor of 400V.
LED constant-current source circuit the most according to claim 1, it is characterised in that described electric capacity C1 is the electric capacity of 0.47uF.
LED constant-current source circuit the most according to claim 1, it is characterised in that described resistance R5 is the R5 in 240 Europe.
5. according to the arbitrary described LED constant-current source circuit of claim 1-4, it is characterised in that described constant-current source circuit is the constant-current source circuit of output constant current 10mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620177969.0U CN205584546U (en) | 2016-03-09 | 2016-03-09 | LED constant -current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620177969.0U CN205584546U (en) | 2016-03-09 | 2016-03-09 | LED constant -current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205584546U true CN205584546U (en) | 2016-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620177969.0U Expired - Fee Related CN205584546U (en) | 2016-03-09 | 2016-03-09 | LED constant -current source circuit |
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| CN (1) | CN205584546U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729615A (en) * | 2017-10-30 | 2019-05-07 | 上海泛谱电力保护设备有限公司 | A kind of novel LED illuminating replacement light source |
-
2016
- 2016-03-09 CN CN201620177969.0U patent/CN205584546U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109729615A (en) * | 2017-10-30 | 2019-05-07 | 上海泛谱电力保护设备有限公司 | A kind of novel LED illuminating replacement light source |
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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 |
Granted publication date: 20160914 Termination date: 20190309 |
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| CF01 | Termination of patent right due to non-payment of annual fee |