[Amps] Bleeder Resistor Qusetion

Bill Turner wrt at dslextreme.com
Mon Nov 17 07:56:06 EST 2003


On Sun, 16 Nov 2003 18:31:03 -0800, R.Measures <r at somis.org> wrote:

>**  With a resonant-choke filter, enough bleeder current must flow to 
>keep the output V from soaring during RX. 

_________________________________________________________

Even with a non-resonant choke filter, you can get some surprisingly
high voltage spikes when the load varies suddenly.  I once made a ~150
volt DC supply for test purposes and was easily able to get 300 volt
spikes when suddenly removing a resistive load.  Bleeders will help to
alleviate this condition, as will having a large output C, but careful
evaluation is needed before putting such a supply into operation.

--
Bill, W6WRT



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