Re: 9W LED inrush current

Pimpom <Pimpom@invalid.invalid> wrote:

On 03-10-2024 06:02 am, Don Y wrote:

On 10/2/2024 1:32 PM, Don Y wrote:

On 10/2/2024 12:13 PM, Martin Brown wrote:

On 02/10/2024 13:03, Pimpom wrote:

On 02-10-2024 03:21 pm, Jan Panteltje wrote:

On a sunny day (Wed, 2 Oct 2024 12:01:47 +0530) it happened Pimpom
<Pimpom@invalid.invalid> wrote in <mN5LO.101241$CStb.23546@fx12.ams1>:
 

Does anyone have a figure for the switch-on inrush current of a
typical
9W LED bulb? Preferably for 230/240V.

 
Not sure wat the 'typical' circuit is, this is wha tI found in my
LED bulbs from Cina:
  https://panteltje.nl/pub/LED_light_circuit_diagram_IMG_6925.JPG
   peak current is limited by the 1uF series cap at 50 Hz here.
There are so many different LEDs around,...
 

Ah, I should have formed my question more carefully. I know about
those early bulbs. They were the precursors to modern ones that use
switching supplies. These later models are the ones I mean.

 
It is still likely to be fairly small since the cheap parts they use
are not capable of more. Only way to be sure for a specific brand is
to measure it. I'd expect no more than 2-3x its nominal operating
current. The reservoir capacitor is seldom bigger than needed to
avoid visible flicker and sometimes not even that on the cheap and
nasties.

 
For lighting *installations* (i.e., not individual lamps), I think they
use 100x the steady state current as an upper figure.  This is intended
to cover model and manufacturer variations.
 
With multiple lamps on a branch circuit (or whatever is driving them),
this can add up pretty quickly.
 

Why do you need to know?

 
<https://adlt.com.au/resources/led-inrush-currents/>
 
 

That's the link I mentioned seeing before. I was bury and only scanned
it briefly.
 

There is a relay (from memory Hongfa HF115 or Schrack RX03) whose data
sheet specifies inrush , something like 165A for 20ms incandescent or 425A
for 1.5 ms LED which gives you rough indication of magnitude of the
problem. Yes, contact welding is a problem.

--
piglet