High pitch noise - Shelly RGBW and Meanwell LPV150

Hardware
1

Have two Meanwell LPV150-24
Connected to each are 5meter white LEDS 24V 50W each

Used the shelly RGBW2 to control them. The problem is a high pitch noise coming from the LPVs. Any soution for this? Maybe some dampening material or even opening them and filling with something?

2

I think you have an oscillation high frequency transformer in there, which is not fully ok. Could be failing soon or sometimes the ferite plates are not fully glued together which can result in a pitch.
It seems unwise to dampen it with stuff inside, but that is your own decision, nor could it be wise to wrap it to tight in sound insulation for if the heat up, did you test that else they might give up in a flash.
My two cents this is. hope you get it solved

3

They are brand new and there are two of them with the same problem.
It has internal thermal protection so i believe it will just shutoff.
Looking at the data sheet there is a pwm control. Wonder what that is.

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4

Sometimes it happens that even brand new items have this high pitched buzz, due to the switching transformer, it happens.
In the PWM control i see that it is being feedback controlled by an OVP probably over voltage protection and another detection circuit, what that detects it does not say. Could be surges, shut offs, or anything your guess as good as mine.

5

Thanks for the help. Appreciate it. Had to just use some insulation without hurting the airflow to solve the problem

6

Same thing happening here, to rule out moskovskiy82 electrical installation. Shelly RGBW2 and Meanwell LPV150, latest firmware on Shelly and high pitch noise, specially when the led strip is turned off.

Since the PSU and Shelly are inside the wall register, how did you insulate it? Just wrap PSU with foam? Did you check temps after that?

7

Mine is installed in the attic. So i’ve just added two more layers of rock wool below it. Still has plenty of airflow. As others mentioned wrapping the PSU is not an option due to temps.

I have just installed LPV150 with a Gledopto RGBWW controller and it works without any problem or noise. So i believe it’s a pair of Shelly + LPV which don’t match

8

What are the advantadges of the Gledopto besides the lack of noise? I cant see the Gledopto having a wall switch input as the Shelly has.

9

Can’t think of any.
Actually if i had to go back i would go for a fibaro rgbw 2. Looking at the amount of options and robustness of their dimmers (have around 12 of them) - seems like the best option

10

I can confirm I have the same issue with a LPV-150-24 and the Shelly RGBW2. The buzzing becomes apparant at around 100W load. Another Meanwell PSU - LRS-150F-24 has the same issue.

I’ll try without the Shelly in line…

11

Maybe it is related to this recent analysis: https://teardownit.com/posts/shelly-rgbw2-controller-and-shelly-duo-rgbw-bulb-dangerous-light-pulsations

ESPHome allows you to set the PWM frequency to 1000Hz (over the default 600Hz). Has anyone tried this with the Mean Well LPV series?

12

I replaced a Shely RGBW2 with an ESP32 based dimmer with a 10khz pwm frequency and the buzzing went away, at least under load. The LPV still buzzes a bit with very low load (=led’s off, just powering the ESP) ( magnetoconstriction ? ).

I can confirm that the meanwell HLG and XLG series PSU’s don’t have these issues. They are a bit more expensive though.

I think the LPV series are only suited if you either

  • don’t use dimming at all and switch it on/off at the AC side
  • have the PSU in a spot where noise is not a concern
  • use a high-enough frequency PWM dimmer and cutoff the AC side when no load is present (= this is likely more complicated and expensive then just getting a better PSU)

Edit : I did look into a low pass filter as explained here, but browsing digikey tought me high-current inductors are expensive… and it likely would not have solved the no/low load noise anyway.

13

Hey I want to come back on this.

I am using 240w Meanwell XLG power supply at 24V on my setup with two shellys and I am experiencing the same issue (high pitch noice).

This was not so noticeable for 1 shelly on the supply, but with two it is very obvious.

As the PMW-frequency seems to be an issue, I would like to ask for shelly alternatives. I couldn’t really find products following the IEEE recommendations.
To get rid of at least the noise, I thought about a big capacity/high frequency filter too as supposed in the other topic.

But first: could anyone of you resolve the issue with another product?

Best