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What is flicker free lighting?
Flicker-Free LED Lighting Is a Bold Step Forward If a light source is flickering faster than 80 times per second1—for example, at the power line power frequency of 120 times per second—our bodies still respond to the light’s fluctuations even though we may not “see” them.
What frequency do LED lights flicker at?
Studies have shown that the human eye can perceive flicker of LEDs at rates of up to 90 Hz, and anything above that is imperceptible to the human eye.
What is the advantage of flicker?
Flicker-free lighting has been shown to reduce headaches, eye strain and even fatigue.
How to minimize light flicker in LED lighting applications?
RT7302GS is a constant current Flyback LED driver using primary side regulation and constant ON time topology to obtain high power factor. The converter switches in boundary conduction mode. The below picture shows a reference design for a 20W T8 application. Max light flicker is defined at 30%. Figure 7.
How is the current of an LED lamp related to flicker?
LED light output is directly related to the current through the LED, and by nature LED light output reacts instantly on changing LED current conditions. Stable LED driving current is therefore the main criteria to achieve flicker free operation in LED lamps. 2. Relation between Flicker, LED Current and LED Voltage Ripple
How does a high PF converter reduce flicker?
The output current of the high PF converter can be approximated by a sine 2 function, which is a cosine waveform with double frequency and the average LED current as mean value. The voltage buffer element is now C2, and it is used to reduce the voltage ripple across the LED string.
Why does my LED light flicker when offline?
In most offline LED drivers, the circuit parameters control the output (LED) voltage ripple, and the LED current ripple is a result of the output voltage ripple. Therefore it is important to know the relation between the voltage ripple across the LED string and the current ripple through the LED.
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