Electronics > Beginners

PSU supporting both 120v and 240v.

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CJay:

--- Quote from: senso on June 11, 2019, 01:11:27 pm ---Dont look to the crap from Nox..
Look at decent PSU's, like Seasonic, and they all state this:
AC Input   Voltage: 100 V - 240 V

And, they have active PFC, who knew..

https://www.pccomponentes.com/seasonic-s12ii-520w-80-plus-bronze

--- End quote ---

I've a feeling the only way to get a efficiency rating is with active PFC?

soldar:
Harmonic suppression compliance can be generally achieved with passive filters but active PFC has other benefits, mainly that it is, in itself, a pre-regulator so the following switching part is working pretty much from a constant DC voltage.

mariush:
99% of 80+ bronze/gold and higher ATX power supplies are wide input range
80+ "white" allows 230v only psus, which otherwise won't reach 80% effiiciency on 110v or they use small/cheap parts (ex a 4A bridge rectifier or 2-3A diodes on a 500w psu.. too low to get 500w on 110v)

A linear psu can be made using transformer with 2 primary windings and parallel or series them depending on voltage/

Or, you can do like atx  psus  AC->DC, optional boost to ~400-420v DC (actve pfc), then high frequency switching (typically at least 30kHz or higher to stay above  hearing range, but 200kHz..500kHz is common)

wraper:

--- Quote from: CJay on June 11, 2019, 11:09:33 am ---
--- Quote ---I suppose you could design a PSU that detected input voltage and switched but I do not think they are common at all.
--- End quote ---


Are you joking?

The majority of power supplies in PCs for the past two decades have been wide input range or autoswitching, they are by far the most common type, there are even dedicated ICs for detecting line voltage and autoswitching.

--- End quote ---
They don't do any autoswitching except very rare cases. Manually switchable input voltage is still more common than autoswitching. LOW power SMPS usually just work in wide input voltage range. Those of higher power have PFC (works in wide input voltage range as well) which converts input voltage into around 400VDC and then SMPS works from that.

wraper:

--- Quote from: CJay on June 11, 2019, 01:20:11 pm ---
--- Quote from: senso on June 11, 2019, 01:11:27 pm ---Dont look to the crap from Nox..
Look at decent PSU's, like Seasonic, and they all state this:
AC Input   Voltage: 100 V - 240 V

And, they have active PFC, who knew..

https://www.pccomponentes.com/seasonic-s12ii-520w-80-plus-bronze

--- End quote ---

I've a feeling the only way to get a efficiency rating is with active PFC?

--- End quote ---
You cannot legally sell them in EU without PFC. SMPS above certain power rating do have minimum power factor requirement. And simple rectifier + smoothing capacitor do not meet that.

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