[Amps] ferroresonant power supplies

[Gary Schafer]

They are rather inefficient. They draw a lot of current with a light load.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On Behalf Of Danny Pease
> Sent: Thursday, May 10, 2012 5:57 PM
> To: amps at contesting.com
> Subject: [Amps] ferroresonant power supplies
> 
> Since ferroresonant power supplies were mentioned, I have to ask the
> question, why aren't they used for high voltage supplies? My experience
> with
> them has been at a lower voltage, 26 VDC. Is there a reason other than
> weight and expense, that they are not used for high voltage supplies?
> 
> I also did not notice the regulation being all that great on the ones I
> was
> exposed to, it seemed voltage from minimal load to full load was almost
> 10
> percent and I also noticed it seem the output voltage was higher with
> lower
> input voltage, example - a 26.5 VDC output with 230 vac in would be 29
> VDC
> out with 208 VAC in. Another issue was what I considered really high
> ripple,
> around 10 percent with almost 5 percent with minimal load and that was
> wit
> 400,000 uF of filter.
> 
> The saving grace was they had very few parts and practically never
> failed.
> 
> NG9R
> 
> 
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