Stroboflash-free eye protection table lamp control system

Abstract

The invention discloses a stroboflash-free eye protection table lamp control system. The system comprises a micro-control unit module, and the micro-control unit module is electrically connected withan LCD display module, a touch key module, a power supply management module, an LED light source driving module, a learning time timing module and a sitting posture adjusting module. The power supplymanagement module is unidirectionally and electrically connected with an LED light source, and the LED light source is bidirectionally and electrically connected with the LED light source driving module. The stroboflash-free eye protection table lamp control system is equipped with an LED light source module, a stroboflash-free LED driving module and a stroboflash test module, the stroboflash problem of an LED eye protection table lamp can be well solved; after the brightness and the color temperature of the LED desk lamp are adjusted, the fluctuation depth of the luminous intensity of the LEDeye protection desk lamp is small, the change of the brightness is small, and the stroboflash-free effect can be basically achieved; the test measurement of the fluctuation depth and a stroboflash curve can be completed by a low-cost method, and a better use prospect is brought.

Description

technical field [0001] The invention relates to the field of flicker-free systems, in particular to a flicker-free eye protection desk lamp control system. Background technique [0002] The flicker-free system is a system that realizes the flicker-free effect of the LED eye protection desk lamp. The current technology of the flicker-free LED eye protection desk lamp is actually to solve the problem of the strobe frequency from the power supply level. The ultra-high frequency The human eye will not feel flickering, and the low-frequency human eye will have an intuitive feeling. To realize the LED eye protection desk lamp without stroboscopic, or to do the mainstream output of ultra-high frequency (this solution still has stroboscopic, but the human eye cannot observe it. ), and another is to really remove or reduce the frequency fluctuation in DC, that is, the ripple content. The stroboscopic and stroboscopic effects are aimed at electric light sources, the fluctuating depth ...

AI Technical Summary

Problems solved by technology

[0002] The flicker-free system is a system that realizes the flicker-free effect of the LED eye protection desk lamp. The current technology of the flicker-free LED eye protection desk lamp is actually to solve the problem of the strobe frequency from the power supply level. The ultra-high frequency The human eye will not feel flickering, and the low-frequency human eye will have an intuitive feeling. To realize the LED eye protection desk lamp without stroboscopic, or to do the mainstream output of ultra-high frequency (this solution still has stroboscopic, but the human eye cannot observe it. ), and another is to really remove or reduce the frequency fluctuation in DC, that is, the ripple content. The stroboscopic and stroboscopic effects are aimed at electric light sources, the fluctuating depth of luminous flux and the resulting harmful effects (called stroboscopic Effect) size of two mutually causal physical quantities, stroboscopic refers to the depth of luminous flux fluctuations of electric light sources, the greater the depth of luminous flux fluctuations, the more serious stroboscopic, the existing stroboscopic measurement method: the stroboscopic ratio is equal to within one switching cycle The difference between the maximum light output and the minimum light output is divided by the sum of the maximum light output and the minimum light output. The stroboscopic index is equal to the amount exceeding the average light output in one switching cycle divided by the total light output. Human eyes are not sensitive to flicker above 60Hz Sensitive, the power frequency of the output terminal of LED constant current power supply is generally 100Hz and above. When shooting with CCD photosensitive imaging (mobile phone, camera), water ripples will appear due to the difference in sampling frequency, but it is different from the default settings of mobile phones and cameras. Frequency, photosensitive element, and shutter speed are all related, so this test method is not necessarily accurate, but it is a simple test method.

[0003] The traditional test method is: turn the black and white gyroscope under sunlight, the pattern will form a stable ring shape, and the color ring will not change with the rotation speed and direction, and turn the black and white gyroscope under the tested light Instrument, observe the phenomenon: if the color of the pattern or the ring structure changes, it means that there is stroboscopic light, and the more obvious the change, the stronger the stroboscopic. This method cannot make an accurate judgment on the depth of stroboscopic, the most scientific test method Yes: Use Light Flickering Analyzer, the core of which is an ultra-fast photometer with a sampling frequency of 10kS / s (testing 10,000 times per second), to scan the luminous curve of luminous objects (similar to an oscilloscope), and Calculate the flicker index and other parameters to get the fluctuation depth of light (light ripple coefficient), and there is no need for stroboscopic flicker. There is no uniform standard in the market to strictly require the stroboscopic depth of the light source. At present, some customers require the fluctuation depth to be <8%, some require <5%, and some even require <1%.

[0004] There are certain disadvantages in the use of the existing non-stroboscopic system. After the brightness adjustment of the existing LED, the luminous intensity of the LED desk lamp fluctuates, which is the stroboscopic problem of the LED desk lamp, and the depth of the luminous intensity fluctuation shown The feeling of strobe is different because of the difference of the light source. When the fluctuation depth of the luminous intensity is very large, the human eye can clearly feel the flicker of the LED desk lamp. Everyone has different sensitivity to the strobe. At 50Hz, some people will not notice it until 100Hz, but at 3-70Hz low-frequency flicker can cause adverse chain reactions for high-sensitivity people, and there is also a problem with non-video flicker greater than 100Hz, because between 100~70Hz Moderate stroboscopic flicker at 500Hz may also cause indirect perception of stroboscopic effect, such as eye muscle tension, fatigue, and even accompanied by symptoms such as headache, physical and mental exhaustion, vision loss, and photosensitive epilepsy. Disease, distraction, autism and other conditions, the harmfulness of light source flicker to human body is worthy of vigilance. Therefore, we propose a flicker-free eye protection desk lamp control system

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