On Fri, 19 Nov 2004 09:42:43 -0800, R.Measures wrote:
>Question: A Hipersil transformer with a combined primary+secondary
>winding ESR of 0.144?,, is connected to a FW rectifier/C-filter. If
>the transformer is connected to 240Vrms mains with an ESR of 0.127?,
>what is the maximum peak inrush current? What would be a suitable
>value of step-start R to limit the inrush current to 50A-rms? (--
>note -- assume that the Hipersil transformer has virtually zero core
>loss)
_________________________________________________________
There is another factor which must be considered: The amount of
capacitance at the output of the full wave rectifier. The
transformer/rectifier will try to charge it to full voltage in the
first half-cycle and that will cause the greatest part of the inrush
current.
--
Bill W6WRT
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