On Sep 19, 2004, at 3:51 PM, Radio WC6W wrote:
On Sat, 18 Sep 2004 17:55:33 +0200 (CEST) Roger B <f6fer@yahoo.fr>
writes:
Hello to all
I am designing a 2kV PSU for a 1kW amp (bridge not
doubler).
About equalising resistors and capacitors with HV
diodes, some says it is absolutely necessary. Others
say it is a waste of time with modern diodes.
Any comment will be appreciated. 73 Roger
Hi Roger,
Depends on which diodes... and how reliable you wish the resulting
unit to be...
- Indeed But do "equalizing" resistors increase or decrease
reliability? Without equalizing resistors, and provided that all of
the rectifiers in a series-string have similar junction-capacitances,
the reverse current is the same in each one. Since excessive
reverse-current is what typically causes rectifier failure, not having
more reverse current in any one rectifier is desirable. Although
"equalizing" resistors equalize reverse voltages, they often
un-equalize reverse currents. Thus, unless the measured PIVs of the
rectifiers are identical, removing equalizing resistors should increase
reliability.
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|