LED FLICKER BULBS DRIVER
The ripple current in the LED load may be reduced by utilizing an electrolytic capacitor across the diode bridge in the driver circuitry. The driver circuitry is designed to convert the AC mains voltage into the constant load voltage and constant load current to ensure that flicker is not visible to the human eye. An LED driver is a self-contained power supply which includes outputs matched to the electrical characteristics of the LEDs. A flicker of the LED takes place when a current waveform of the power provided to the LED is imbalanced. Line voltage sources are AC waveforms and the voltage at the line source varies with time. LEDs are current driven rather than voltage driven devices. The ripple current is often twice the input AC line frequency, as an illustration, if the AC sinusoidal frequency is 60 Hz, the rectified sinusoidal frequency will double as 120 Hz. The LEDs can't be forward-biased to illuminate and the flicker phenomenon takes place during the dead time (near the beginning and end of each DC pulse cycle in which the input voltage is less than the combined forward voltage drop of the LEDs) at a repetition rate of twice the AC sinusoidal frequency. The AC sinusoidal input voltage would typically be rectified by a full-wave or a half-wave rectifier into a rectified sinusoidal input voltage before being delivered to power the LEDs.
A residual of the alternating current (AC) input may come up on the output as a variation or ripple which may correspond to the AC frequency, like for example 120 or 100 Hz. Flicker and visual fluctuation can be noticed when there are sufficiently large ripples in the direct current (DC) delivered to the LED lamp.
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