Hello,
Is the biggest threat to the longevity of offline switch mode LED drivers (for LED lightbulbs) the high voltage transients that occur on the mains?
A certain lighting company has developed a lighting product, whereby multiple LED lamps run off the output of a large power supply...they say that its best to have one power supply for say 20 LED lamps, because then you can put proper, substantial mains transient voltage suppression in the centralised power supply.
(I cannot tell you the name of the company, but they currently state this on their website now. If I give their name, then it looks like I am trying to advertise them)
I believe that lifetime estimates for LED lightbulbs are farcical, because most of them are power factor corrected, and have very little capacitance on the primary side DC bus, and so are liable to receive component damage due to mains voltage transients. MOVs and TVS's are used, but that's not good enough since these have terribly wide tolerances on their breakover voltage. A centralised power supply, with active transient suppression circuitry is needed.
Does any reader have an article which lists (for any country of your choice) what are the typical magnitudes and durations of voltage spikes occurring on the domestic mains? (page 1.20 "switchmode power supply handbook" by Billings and Morey suggests there's at least 50 surges per year of >2000V on the {presumably} USA mains.)
Is the biggest threat to the longevity of offline switch mode LED drivers (for LED lightbulbs) the high voltage transients that occur on the mains?
A certain lighting company has developed a lighting product, whereby multiple LED lamps run off the output of a large power supply...they say that its best to have one power supply for say 20 LED lamps, because then you can put proper, substantial mains transient voltage suppression in the centralised power supply.
(I cannot tell you the name of the company, but they currently state this on their website now. If I give their name, then it looks like I am trying to advertise them)
I believe that lifetime estimates for LED lightbulbs are farcical, because most of them are power factor corrected, and have very little capacitance on the primary side DC bus, and so are liable to receive component damage due to mains voltage transients. MOVs and TVS's are used, but that's not good enough since these have terribly wide tolerances on their breakover voltage. A centralised power supply, with active transient suppression circuitry is needed.
Does any reader have an article which lists (for any country of your choice) what are the typical magnitudes and durations of voltage spikes occurring on the domestic mains? (page 1.20 "switchmode power supply handbook" by Billings and Morey suggests there's at least 50 surges per year of >2000V on the {presumably} USA mains.)
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