CN105744685A

CN105744685A - Apparatus for reducing illumination flickering

Info

Publication number: CN105744685A
Application number: CN201610244953.1A
Authority: CN
Inventors: 黄初镇
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-20
Filing date: 2016-04-20
Publication date: 2016-07-06

Abstract

The invention relates to an illumination dimming apparatus. The apparatus has the advantages as follows: the apparatus adopts a combination of multiple lamps; one of the lamps is regulated and controlled by a PWM (pulse width modulation) technology to enable the lamp group to realize 0-100% of power stepless-changing light emitting; and the PWM dimming color temperature is kept unchanged. The original lamp group flickering control is changed into the flickering control on one of the lamps in the lamp group by the apparatus, so that the lamp group flickering amplitude is greatly lowered, and the light stability and adaptability of illumination are improved.

Description

A kind of device reducing illumination flicker

Technical field

The present invention relates to lighting control technique field, be specifically related to PWM and the control circuit of a kind of illumination, its major function is to reduce PWM to dim the flicker brought.

Background technology

In the brightness adjustment control of LED, there are current system light modulation, pulse width modulation (PWM, PulseWidthModulation) mode to dim and wait 3 kinds with plurality of LEDs packet regulation and control.1st kind is the mode making follow current flow through LED and making current value change；2nd kind is make current value fix and flows a current through the mode that the time of LED changes；3rd kind simply regulates and controls with burster.

PWM control mode is a kind of LED illumination control methods that application is maximum, its advantage is that the colour temperature of LED is constant and continuously light-adjustable, shortcoming is to glimmer, although this flicker can be used and adjust high-frequency mode, naked eyes are made to be difficult to feel the existence of flicker, but, flicker still exists, still making eye strain, problem still exists.In some applications, during such as telephotography, the scintillation in illumination can cause the image brilliance unexpected change of shooting.Although can improving by the method improving PWM frequency, but some problem still existing, and increase PWM frequency will increase equipment cost.Especially for seeing the mobile phone, the LED screen time such as TV increasing people, protect its eyes, arduous task.For this, the LED illumination flicker problem caused because of PWM light modulation is that industry captures one of difficulty all the time.

To be the patent disclosure of CN201010178232.8 a kind of utilizes PWM timing variations to reach to reduce the technology of flicker for the patent No., this technology is very creative, but this technology can produce a kind of new flicker, or cry and flash, reason is that this technology is equivalent to each LED wheel and and light, and it can produce flashing on position.

Summary of the invention

For overcoming the above deficiency of existing LED illumination, disclosure one reduces the power control of (because PWM causes) illumination flicker, this device comprehensive utilization prior art carries out different combinations, make under the premise not increasing equipment investment, be substantially improved PWM and dim the flicker problem brought.

The technical solution adopted for the present invention to solve the technical problems is: adopt part PWM light modulation to replace overall PWM dimming mode, coordinate burster regulation and control, reduce PWM light modulation and cause the purpose of flicker, concrete grammar is that original lamp makes into lamp group (being made up of multiple low power lamps), the general power of lamp remains unchanged, with the normal bright light of varying number and the combination of PWM desk lamp with dimmer switch in work, send required luminous power.The technical program, because there being the existence of normal bright light so that under same light power condition, the flicker level that group lamp produces greatly declines.

Present invention is especially suited for the PWM of LED illumination light modulation, it provides the benefit that, it is only necessary to uses little LED instead and changes control circuit, just can be greatly reduced flicker level, reduce its inconvenience brought and injury, and maintain the stepless dimming of PWM and the advantage that colour temperature is stable.The present invention largely solves the difficult problem that industry attacks for a long time without any result for many years.

Accompanying drawing explanation

Fig. 1 illustrates that one end of tradition LED television backlight bar, and wherein: 1001 is LED lamp bead, the television set of usual 55 cun has about 66 such lamp bead, and general power is at about 30W；1002 is the fixing aluminium flake of LED lamp bead 1001, and an aluminium flake there are about 11 LEDs lamp bead；1003 is power pins.

Fig. 2 illustrates that, an example application of the present invention program, each LEDs lamp bead 1001 in Fig. 1 changes into the little LED lamp bead by 8 power is identical and forms, and therein 2001 is that PWM dims lamp bead, and 2002 is without light modulation lamp bead (totally 7).

Fig. 3 is another improved application of Fig. 2, and wherein the power of lamp bead 3001 is 2 times of lamp bead 2002, and the power of lamp bead 3002 is 4 times of lamp bead 2002.Fig. 3 can play the effect that Fig. 2 is identical, and advantage is that overall lamp bead quantity is a half, and control circuit is also optimized accordingly.

Detailed description of the invention

The purport of the present invention is to improve tradition PWM to illuminate the flicker defect brought, and effectively reducing the flicker level of PWM light modulation, thus improving the Stability and adaptability of PWM illumination, reducing its injury to eye.

Below in conjunction with drawings and Examples, present disclosure being carried out example to release, content mentioned in embodiment is not limitation of the invention.

Embodiment 1

Explain an application of the present invention in conjunction with Fig. 2, in figure, LED 2001 is luminous by PWM, and the light and shade realizing light according to the dutycycle of pwm pulse regulates, and other 7 LED lamp 2002 are not by PWM, and flicker free, lamp group has 8 LED lamp.The luminescent composition of lamp group is as follows: when the luminous power of lamp group is when flat-out 7/8～8/8,7 LED lamp 2002 all light, LED 2001 is lighted by PWM；When luminous power is when 6/8～7/8, only lighting 6 LED lamp 2002, LED 2001 is lighted by PWM；When luminous power is when 5/8～6/8, only lighting 5 LED lamp 2002, LED 2001 is lighted by PWM；The like.As can be seen here, no matter under what circumstances, only LED 2001 is luminous by PWM to LED group, and for lamp group, this is " part light modulation, winking ", and luminous power fluctuation (i.e. flicker) degree of lamp group greatly declines.Such as, when the luminous power of lamp group is in 7/8～8/8 scope of general power, luminous power fluctuating margin is in 0/8～1/8(that is 0～12.5%), average luminescence power swing amplitude about 6%.It can be seen that the LED quantity of lamp group is more many, luminous power fluctuation is more little.

Embodiment 2

Illustrating in conjunction with Fig. 3, the present embodiment is the improvement version of embodiment 1, and 8 lamps in embodiment 1 change into 4 lamps that power does not wait, and its advantage is the reduction of the quantity of LED and corresponding control circuit, optimizes production process, reduces production cost.From the luminous power of lamp: 3001=2002 × 2,3001+2002=2002 × 3,3002=2002 × 4,3002+2002=2002 × 5,3002+3001=2002 × 6,3002+3001+2002=2002 × 7, therefore Fig. 3 fully achieves the same effect of the various illuminated in combination in Fig. 2.

Claims

1. the device reducing illumination flicker, it is characterized in that: the lamp group that this device is made up of control circuit, 2 and above lamp forms, a portion lamp is controlled by pwm signal, for the lamp that brightens, another part lamp is not controlled by pwm signal, and for normal bright light, the lamp that brightens carries out from normal bright light different lighting combination, realizing lamp group to dim at 0～100% power stepless, control circuit is then responsible for controlling bright spot and the PWM of lamp group.

2. a kind of device reducing illumination flicker according to claim 1, it is characterised in that described lamp can be LED, it is also possible to be other lamps that PWM can be subject to luminous.

3. a kind of device reducing illumination flicker according to claim 1, it is characterised in that the luminescence of described lamp, it is possible to be visible ray, it is also possible to be black light.

4. a kind of device reducing illumination flicker according to claim 1, it is characterised in that described in the lamp that brightens be usually a lamp therein.

5. a kind of device reducing illumination flicker according to claim 4, it is characterised in that the lamp that usually power is minimum of the lamp that brightens described in it, other lamp power can be identical with this lamp, or the multiple of this lamp power.