Contents
How to eliminate PWM switching noise?
PWM noise, as well as inductive kick, can be reduced or eliminated by slowing the slew rate of the PWM drive signal to the fan. Even a small reduction in slew rate results in a significant reduction of the PWM noise.
Why do my LED light strips make a high pitched noise?
It’s impossible for an LED* to emit noise (more than once). This is a problem with the power supply or driver circuit. If these are 120V screw-in LEDs, then the built-in driver is the problem and replacing the whole unit is hte only option.
Why are my LEDs making a noise?
LEDs lack a filament or firing arc so there are no “moving parts” to cause humming. Unfortunately, LEDs still suffer from electromagnetic (EM) hum caused by incorrect dimming or EM interference by other devices. But, if your lights hum when dimmed or installed into sockets connected to a dimmer, it’s simple to fix.
Should LED lights make a noise?
While most LED lights are dimmable, a common complaint is hearing a buzzing sound coming from the lights when they are dimmed. The cause is almost always a compatibility issue between the dimmer and the LED’s driver (power supply). CL dimmers will eliminate the buzzing on most brands of LEDs, but not all.
What should I do if my PCB makes PWM noise?
Stiffen your PCB by mechanical means in the vicinity of the culprit, in order to prevent the board from vibrating and acting as a speaker. If the inductor is the cause, this also applies. Use a driver that can do PWM above the audible range. There are other options, but you may want to research them for yourself.
Why does my LED light make a buzzing sound?
While most LED lights are dimmable, a common complaint is hearing a buzzing sound coming from the lights when they are dimmed. The cause is almost always a compatibility issue between the dimmer and the LED’s driver (power supply).
Why is the PWM dimming frequency so low?
The familiar PWM dimming frequency range is less than 1kHz. Due to the piezoelectric effect of the ceramic capacitors and the oscillation of wire winding coil, the discrete low frequency (relative to the WLED driver’s switching frequency) dimming cycles can possibly cause audible noise in the system.
What should I do if my LED light is making a humming noise?
If the LED illuminate emits annoying noises, the only solution is to replace it with a lamp of the same type but of a different type or manufacturer. The switch to a completely identical model of the same type and manufacturer will only help in rare cases. When operating LED lamps on a dimmer, a number of difficulties can arise.