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**momaka** · 10-19-2020, 07:17 PM

Well, APFC is a whole another story. Even good Japanese caps fail there sometimes, particularly if the manufacturer penny-pinched and used 85C -rated caps instead of 105C -rated caps... and also 400V caps instead of 420V or 450V caps. Going with 105C caps for higher rated voltage means bigger caps - which is quite necessary, because APFC puts more stress on the caps (lower ripple current than at 50/60 Hz, but at much higher frequency, so the end result is more stress on the caps than caps simply getting rectified DC straight from the line at 50/60 Hz.)

10-19-2020, 07:17 PM	#9
momaka master hoarder Join Date: May 2008 City & State: VA (NoVA) My Country: U.S.A. Line Voltage: 120 VAC, 60 Hz I'm a: Hobbyist Tech Posts: 10,860	Re: Blown cap Well, APFC is a whole another story. Even good Japanese caps fail there sometimes, particularly if the manufacturer penny-pinched and used 85C -rated caps instead of 105C -rated caps... and also 400V caps instead of 420V or 450V caps. Going with 105C caps for higher rated voltage means bigger caps - which is quite necessary, because APFC puts more stress on the caps (lower ripple current than at 50/60 Hz, but at much higher frequency, so the end result is more stress on the caps than caps simply getting rectified DC straight from the line at 50/60 Hz.)