RE: DC Power Applied to an AC Rated Switching Power Supply

1999-11-17 Thread Jim Eichner
Peter: I don't think a 250Vac fuse can be relied on at 250Vdc, let alone 370Vdc. Regards, Jim Eichner > Senior Regulatory Compliance Engineer Statpower Technologies Corporation jeich...@statpower.com http://www.statpower.com > phone:(604) 420-4820 ext. 2162 > fax: (604) 420-1591 Any

Re: DC Power Applied to an AC Rated Switching Power Supply

1999-11-17 Thread Robert Macy
BE CAREFUL ! ! ! If this PS does not have Power Factor Correction Many switching power supplies comply with the conducted emissions limits BECAUSE of the conducting angle of the AC diodes. Simply said, the AC rectifying diodes only come on for 15--18% of the duty cycle. therefore the noise de

RE: DC Power Applied to an AC Rated Switching Power Supply

1999-11-17 Thread Andrews, Kurt
Peter, Is the DC Input shown on the power supply ratings label along with the AC Input? If this is the case then both inputs would have been tested when the supply was tested by UL and TUV for Recognition. No additional testing would be required. We have used supplies that are rated for both an A