As you have noticed, the 50/60 Hz surge rating is not as high as the current expected during the IEC 61000-4-5 test. When I designed some off line switchers I used 3 amp diodes and there was a thermistor in series. The thermistor was only about 1 ohm hot. I have seen switchers with some pretty tiny looking diodes and have wondered how they survive. Could be a thermistor of a few ohms?
Dave Cuthbert Micron Technology From: [email protected] [mailto:[email protected]]On Behalf Of Bill Flanigan Sent: Monday, December 29, 2003 1:47 PM To: [email protected] Subject: Surge-rating diode bridges Fellow compliance wonks... How to specify a diode bridge to ensure its success during IEC 61000-4-5 Surge testing (mains) to Class 3 (1kV L-L, 2kV L-G)? If the diode spec declares a maximum peak forward surge current, how do I calculate the current this immunity test is likely to provide? Any advice on surviving this test? Thanks WmFlanigan Standards Engineer Ameritherm, Inc. 39 Main Street Scottsville, NY 14546 1.800.456.4328 x118 [email protected] This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
