CN204442760U

CN204442760U - A kind of LED

Info

Publication number: CN204442760U
Application number: CN201520043198.1U
Authority: CN
Inventors: 朱士海; 张治�
Original assignee: Zhejiang kaiyao Lighting Co Ltd
Current assignee: Zhejiang kaiyao Lighting Co Ltd
Priority date: 2015-01-22
Filing date: 2015-01-22
Publication date: 2015-07-01
Anticipated expiration: 2025-01-22

Abstract

The utility model discloses a kind of LED, described LED comprises the single-chip microcomputer, filter circuit and 2 DC drivers that are electrically connected successively, also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings comprise the identical series LED particle of quantity; Single-chip microcomputer comprises 2 signal input ports and 2 pwm control signal output ports that can input external dimmer signal and toning signal, 2 pwm control signal output ports are electrically connected with the signal input part of filter circuit, and the output of filter circuit is electrically connected with 2 DC drivers respectively.The feature that the colour temperature deviation that the colour temperature of the utility model actual mixed light obtained after having mixed light and expection obtain is less.

Description

A kind of LED

Technical field

The present invention relates to field of LED illumination, especially relate to a kind of LED of colour temperature good stability.

Background technology

Along with the development of LED intelligent illumination, the brightness of LED, colour temperature, color, scene etc. can adopt various wireless or wired mode to control, and control to become day by day easy.But current people pay close attention to not enough the light quality of LED illumination and effect, and stroboscopic problem and the color temperature shift problem of LED do not cause enough attention.

Chinese patent mandate publication number: CN202392511U, authorize publication date on August 22nd, 2012, disclose a kind of LED of energy free adjustment colour temperature, include LED reflection shield, described LED reflection shield includes housing and base plate integrated with housing further, be arranged on the LED lamp panel on base plate, be arranged on the LED in LED lamp panel, LED is electrically connected with LED driver by wire, also flourescent sheet is provided with in described LED reflection shield, described flourescent sheet is positioned at the top of LED, described LED includes blue LED lamp and red LED lamp further, described LED driver is connected with red-light LED brightness regulator by wire.The weak point of this invention is, accurately cannot regulate colour temperature.

Summary of the invention

Goal of the invention of the present utility model is the deficiency that the colour temperature in order to overcome LED of the prior art easily offsets, and provides a kind of LED of colour temperature good stability.

To achieve these goals, the utility model is by the following technical solutions:

A kind of LED, described LED comprises the single-chip microcomputer, filter circuit and 2 DC drivers that are electrically connected successively, also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings comprise the identical series LED particle of quantity; Single-chip microcomputer comprises 2 signal input ports and 2 pwm control signal output ports that can input external dimmer signal and toning signal, 2 pwm control signal output ports are electrically connected with the signal input part of filter circuit, and the output of filter circuit is electrically connected with 2 DC drivers respectively.

Fig. 1 and Fig. 2 is respectively the colour temperature of experiment test brand LED 6500K and 3000K particle string with operating current change curve, and as can be seen from Fig. 1 and Fig. 2, the colour temperature of LED particle string can change along with the change of the operating current of LED particle string; Visible, when operating current reduces, all can there is Red Shift Phenomena in the colour temperature of 2 LED particle strings, and the particle string change of 6500K is relatively larger.

In a light modulation color-temperature regulating system, it has been generally acknowledged that the colour temperature (for specified colour temperature) under different operating currents is constant, then the colour temperature after mixed light is the luminous flux weighted average of 2 LED particle colour contamination temperature; But in fact, because the colour temperature of LED particle string under different operating electric current can offset, therefore luminous flux weighted average is utilized to carry out color-temperature regulating, will cause the colour temperature after the mixed light that cannot obtain expecting, the colour temperature deviation that colour temperature and the expection of the actual mixed light obtained of common LED obtain is larger.

The utility model proposes a kind of brand-new LED, utilize the rule that the colour temperature of LED particle string can change along with the change of operating current, oppositely solving the colour temperature in order to reach expection, the operating current of the required work of LED particle string; Make LED particle string A according to operating current I ' _cwork, LED particle string B is according to operating current I ' _wwork, thus obtain expecting that colour temperature is CCT, luminous flux is the mixed light of φ.

The utility model has the rule utilizing the colour temperature of LED particle string can change along with the change of operating current, calculates the colour temperature in order to reach expection, the operating current of the required work of LED particle string; Thus after making mixed light the actual mixed light obtained colour temperature with expect the feature that the colour temperature deviation that obtains is less.

As preferably, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and the specified colour temperature of each LED particle of LED particle string B is 3000K.

As preferably, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and in LED particle string B, the specified colour temperature of each LED particle is 2700K.

As preferably, described filter circuit comprises resistance R1, R2, R3, R4, electric capacity C1, C2; R1, R3 one end is all electrically connected with single-chip microcomputer, the R1 other end is electrically connected with 1 DC driver, C1 one end and R2 one end respectively, the C1 other end and the R2 other end are all electrically connected with another 1 DC driver, the R3 other end, C2 one end and R4 one end, the equal ground connection of C2 and the R4 other end.

As preferably, the model of single-chip microcomputer is 80C51.

As preferably, the model of 2 DC drivers is Mentor MP.

Therefore, the utility model has following beneficial effect:

(1) rule utilizing the colour temperature of LED particle can change along with the change of operating current, calculates the colour temperature in order to reach expection, the operating current of the required work of LED particle;

(2) after mixed light the actual mixed light obtained colour temperature with expect that the colour temperature deviation that obtains is less;

(3) effectively stroboscopic is reduced.

Accompanying drawing explanation

Fig. 1 is the curve chart that a kind of colour temperature of 6500K LED particle of the present utility model changes with operating current;

Fig. 2 is the curve chart that a kind of colour temperature of 3000K LED particle of the present utility model changes with operating current;

Fig. 3 is a kind of circuit diagram of LED of the present utility model.

In figure: single-chip microcomputer 1, filter circuit 2, DC driver 3, LED particle 4.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is further described.

Embodiment is as shown in Figure 3 a kind of LED, LED comprises the single-chip microcomputer 1, filter circuit 2 and 2 DC drivers 3 that are electrically connected successively, also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings include 2 series LED particles 4; Single-chip microcomputer comprises 2 signal input ports and 2 pwm control signal output ports that can input external dimmer signal and toning signal, 2 pwm control signal output ports are electrically connected with the signal input part of filter circuit, and the output of filter circuit is electrically connected with 2 DC drivers respectively.

Carry out color temperature compensating to the utility model to comprise the steps:

The colour temperature of the LED particle A of setting 6500K cool colour temperature is CCTc, and operating current is Ic; The colour temperature of the LED particle B of 3000K warm colour temperature is CCTw, and operating current is Iw;

Setting is CCT by obtaining colour temperature after LED particle A and B mixed light, and the operating current of LED particle A when luminous flux is the mixed light of φ is I ' _c, the operating current of LED particle B is I ' _w;

Step 100, draws the curve that colour temperature changes with operating current

If Imax is the maximum operating currenbt of LED particle A and B, in computer, store 2000 dim signals and color-temperature regulating signal group, and record I ' _cwith I ' _wvalue and the mapping table of corresponding relation of dim signal and color-temperature regulating signal group;

Computer flows to dim signal and the color-temperature regulating signal group of single-chip microcomputer by changing, the operating current Ic of LED particle A is raised gradually by 0 to Imax, the output colour temperature CCTc of LED particle A is detected with colour temperature measurement instrument, computer selecting 8 Ic and corresponding output colour temperature CCTc are utilized to form point (Ic, CCTc), the curve 1 that output colour temperature as shown in Figure 1 changes with operating current Ic is drawn in a computer;

The operating current Iw of LED particle B is raised gradually by 0 to Imax, the output colour temperature CCTw of LED particle B is detected with colour temperature measurement instrument, computer selecting 8 Iw and corresponding output colour temperature CCTw are utilized to form point (Iw, CCTw), the curve 2 that output colour temperature as shown in Figure 2 changes with operating current Iw is drawn in a computer; ;

Step 200, obtains 2 linear fit formula

Computer carries out linear fit to curve 1 and curve 2 respectively, obtains the linear fit formula CCTc=0.331 I corresponding with curve 1 _c+ 6557,

The linear fit formula CCTw=0.06 I corresponding with curve 2 _w+ 2956;

Step 300, obtains the colour temperature formula after mixed light

After setting mixed light, the luminous flux of LED particle A is the luminous flux of Φ c, LED particle B is Φ w,

Colour temperature CCT=(Φ c × CCTc+ Φ w × CCTw)/(Φ c+ Φ w) then after mixed light;

Step 400, calculates the LED particle operating current of colour temperature after the mixed light in order to reach expection

Computer utilizes the following formulae discovery I ' derived according to step 200 and 300 _cwith I ' _w:

CCT＝(Φc×CCTc+Φw×CCTw)/φ，

Φc＝I′ _c×ηc，Φw＝I′ _w×ηw；

CCTc＝0.331 I′ _c+6557，CCTw＝0.06I′ _w+2956；

Wherein, φ=Φ c+ Φ w, Φ c=Ic × η c, Φ w=Iw × η w, η c are the luminous light efficiency of the LED particle A of setting, and η w is the luminous light efficiency of LED of the LED particle B of setting;

Step 500, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ

Obtain I ' _cwith I ' _wafter, computer inquery relation table, obtains and I ' _cwith I ' _wcorresponding dim signal and color-temperature regulating signal group also flow to single-chip microcomputer, make LED particle A according to operating current I ' _cwork, LED particle B is according to operating current I ' _wwork, obtaining colour temperature is CCT, and luminous flux is the mixed light of φ.

In the present embodiment, in LED particle A, the operating current Ic of the specified colour temperature of each LED particle to be the specified colour temperature of each LED particle of 6500K, LED particle B be 3000K, LED particle A is raised by 0 to Imax gradually according to the step-length of 100mA; The operating current Iw of LED particle B is raised by 0 to Imax gradually according to the step-length of 95mA.

Common color temperature compensating method is as follows:

The specified colour temperature of setting 6500K LED particle A is CCT1, and operating current I1, luminous flux is the specified colour temperature of Φ 1,3000K LED particle B is CCT2, and operating current I2, luminous flux is Φ 2.Colour temperature then after mixed light is the weighted average of 2 kinds of colour temperature luminous fluxes:

CCT＝(Φ1×CCT1+Φ2×CCT2)/(Φ1+Φ2)

Wherein Φ 1=I1 × η 1, Φ 2=I2 × η 2, η 1 is the luminous light efficiency of first group of LED, and η 2 is the luminous light efficiency of second group of LED.

Expect the expection colour temperature after the mixed light of CCT, then regulate the value of I1 and I2, equation is set up, but the colour temperature of CCT just after mixed light ideally, the actual colour temperature that obtains and expect the error having 200K between colour temperature CCT.

As shown in Figure 3, input voltage vin drives 2 LED particle A and B through 2 DC drivers; Single-chip microcomputer accepts external dimmer signal and toning signal, and decoding union, exports 2 road pwm control signals, and PWM1 is through R1, C1, R2 filtering, and PWM2, through R3, C2, R4 filtering, obtains direct voltage DIM1, and DIM2 gives 2 DC drivers respectively.2 drivers can export certain direct current, the particle stabilized work of driving LED according to the analog voltage of input.The duty ratio of the output PWM1 of single-chip microcomputer, PWM2 is and I ' _cwith I ' _wcorresponding, thus have modified the color temperature shift impact caused due to operating current change.

Error between the colour temperature of actual output after the utility model mixed light and expection colour temperature CCT is 5K; Therefore the utility model actual mixed light obtained after there is mixed light colour temperature with expect the feature that the colour temperature deviation that obtains is less.

Should be understood that the present embodiment is only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction.

Claims

1. a LED, it is characterized in that, described LED comprise be electrically connected successively single-chip microcomputer (1), filter circuit (2) and 2 DC drivers (3), also comprise the LED particle string A of the cool colour temperature be electrically connected respectively with 2 DC drivers and the LED particle string B of warm colour temperature, 2 groups of LED particle strings comprise the identical series LED particle (4) of quantity; Single-chip microcomputer comprises 2 signal input ports and 2 pwm control signal output ports that can input external dimmer signal and toning signal, 2 pwm control signal output ports are electrically connected with the signal input part of filter circuit, and the output of filter circuit is electrically connected with 2 DC drivers respectively.

2. a kind of LED according to claim 1, is characterized in that, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and the specified colour temperature of each LED particle of LED particle string B is 3000K.

3. a kind of LED according to claim 1, is characterized in that, in described LED particle string A, the specified colour temperature of each LED particle is 6500K, and in LED particle string B, the specified colour temperature of each LED particle is 2700K.

4. a kind of LED according to claim 1, is characterized in that, described filter circuit comprises resistance R1, R2, R3, R4, electric capacity C1, C2; R1, R3 one end is all electrically connected with single-chip microcomputer, the R1 other end is electrically connected with 1 DC driver, C1 one end and R2 one end respectively, the C1 other end and the R2 other end are all electrically connected with another 1 DC driver, the R3 other end, C2 one end and R4 one end, the equal ground connection of C2 and the R4 other end.

5. a kind of LED according to claim 1 or 2 or 3 or 4, is characterized in that, the model of single-chip microcomputer is 80C51.

6. a kind of LED according to claim 1 or 2 or 3 or 4, it is characterized in that, the model of 2 DC drivers is Mentor MP.