Surge limitations in a diode are limited by the ability to transport heat away from the junction. Heat transport is by diffusion. Because of this diffusion transport, a good rule of thumb is to scale the peak current inversely proportional to the square root of the duration of the event. Most diodes do have surge ratings based on the duration of a half cycle of AC power (8.3 or 10 mS for 60 and 50 Hz power, respectively), so scale from there. For some reassurance, look at the time/peak power rating curves for TVS diodes. Don Borowski Schweitzer Engineering Labs Pullman, WA Bill Flanigan <[email protected]> wrote on 12/29/2003 12:46:37 PM: > > 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
