Switch mode supply: worse case (functionality and heating) is low line (-10%) Linear supply: worse case in functionality is low line but worse case for heating is hi-line (+10%.)
Tac Pham > > Disagree. A switched mode power supply (SMPS) will draw more current at low > bus potential to provide constant load output power. > > > > > Mark, > > > > Please pardon my ignorance. I have a silly question. > > It seems to me that the purpose of brownout is to save > > energy by reducing voltage. Why do you test your power > > supply "down to 85 Vac at 50/60 Hz at the maximum > > specified operating temperature with high humidity > > conditions present" instead of "up to 106 Vac ..."? > > Higher voltage would consume more energy and produce > > more heat inside the power supply. > > > > Barry Ma > > Anritsu > > --------------------- > > From: "Mark Schmidt" <[email protected]>, on 11/4/99 > > 9:45 AM: > > > > Eastern Japan Voltage 100 Vac @ 50Hz. (Tokyo, > > Kawasaki, Sapporo, Yokohoma and Sebdai) > > Western Japan Voltage 100 Vac @ 60Hz. (Osaka, Kyoto, > > Nagoya, Hiroshima) > > > > I also agree with Tania and the brown-out conditions > > that exist in Japan. It is my understanding that 90 > > Vac is quite common, personally I would test down to > > 85 Vac at 50/60 Hz at the maximum specified operating > > temperature with high humidity conditions present. > > ---------------------- > > From: "Grant, Tania (Tania)" <[email protected]>, on > > 11/3/99 4:40 PM: > > > > Ages ago when I worked at another company that shipped > > products to Japan, their unwritten rule was to design > > in power supplies that operated without problems at 85 > > Vac, and that had better be designed/tested down to 80 > > Vac, because of the continued brown-out conditions in > > Japan. It seems nothing much has changed. > > > > I don't remember what was stated about the frequency > > tolerance. > > > > Tania Grant, [email protected] <[email protected]> > > Lucent Technologies, Communications Applications Group > > > > > > > > > > > > > > ===== > > Barry Ma > > __________________________________________________ > > Do You Yahoo!? > > Bid and sell for free at http://auctions.yahoo.com > > > > --------- > > This message is coming from the emc-pstc discussion list. > > To cancel your subscription, send mail to [email protected] > > with the single line: "unsubscribe emc-pstc" (without the > > quotes). For help, send mail to [email protected], > > [email protected], [email protected], or > > [email protected] (the list administrators). > > > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
