Why does the LED ceiling light affect the TV signal?
The LED light needs a power supply that converts 220 V of AC power into a low-voltage DC power that meets the LED requirements. The main mode of the LED luminaire is the power supply:
the first stage is the common pulse width modulation (PWM) switching power supply, a low-voltage DC power supply, switching frequency is usually tens of hertz
the pulse width modulation mode, power supply device of the chopper generates harmonic current, to set the audio and video system and other weak current systems produce radio interference, all affect the normal work of other equipment.
The 2 and the second stage modulate the low frequency pulse width by chopping mode, and adjust the duty cycle to adjust the brightness of the lamp. This part of the circuit is usually developed for the lamps and lanterns factory, and the switching frequency varies greatly among the factories. Usually several hundred Hz to tens of Hertz range.
