High inrush current for LED lamps

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Registriert: Dienstag 15. Januar 2008, 11:51
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High inrush current for LED lamps

Beitrag von andy » Samstag 14. November 2020, 10:52

Why could there be problems switching capacitive devices.

Question: I only connected 150W (50 LED lamps) to the socket. It's only 0.65A, but the sockets are designed for 10A.

Answer: The LED lamps and switching power supplies work (mostly) as follows: The mains voltage is rectified with a diode (s) and smoothed with a capacitor. The up to 400V DC voltage is then "processed" further. Because the capacitor is discharged, it creates a short circuit in the first microseconds.
It can flow 100 times more current than "normal": 0.65A x 100 = 65A via the contacts of the relay (which are trembling about to close).

A hybrid relay would solve the problem. We're working on it.

LG Andy