> From: Jay Summet via EV <[email protected]> > > I tested one of my original Curtis 1231C didoes, as well as one of the > replacement diodes I bought to replace them ... from DIOTEC, specifically > their > DR7506FR model (the R at the end means ?Reverse Polarity?, making them > an exact drop in replacement in form factor and polarity).
I have not looked at that particular diode spec sheet, but be aware that for this sort of service, there is more going on than simply current and voltage drop. You also need to consider recovery time. Big fat diodes can have a significant amount of reverse-bias capacitance, which can cause excessive dissipation with fast switching times. You may need to make sure your “drop in replacement” is a “fast recovery” device. If the manufacturer’s application notes mention “switching power supplies,” they’re probably fine, but if they are intended for 50/60 Hz operation, maybe not. Unfortunately, this spec is something a typical home lab isn’t equipped for measuring. You’d need a high-frequency curve tracer, although comparing reverse-bias capacitance may be useful. Jan _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
