[Milsurplus] power supply question

[Jack Antonio]

I'm not trying to make 400 or 800 cycle, I'm wondering if there is any 
problem in running
one of these switching type supplies *from*  a 400 or 800  cycle 
source.  Is there some
limiting factor that restricts it to a 50 or 60 cycle input?

Jack Antonio
WA7DIA


On 7/23/2022 9:33 AM, Jim Whartenby via Milsurplus wrote:
> Jack
> I successfully converted an older APC computer UPS to 400 cycles, see 
> ER 282, November 2012.
>
> I would think that any power supply that directly rectifies the AC 
> line or charges a battery like the above APC power supply is a 
> candidate.  There are several articles on the web that show various 
> solutions.
>
> eBay item # 223984571313, SG3525 LM358 Inverter Driver Board Preamp 
> Drive Board 12-24V, has all of the electronics, excluding the power 
> transformer, rectifier and filter.  The schematic for this module is 
> available on the web, just takes a little searching.  Since it uses 
> the SG3525, a resistor or capacitor or both will change the switching 
> frequency to any frequency desired.  You can use either a center 
> tapped power transformer or one without a center tap.  Did I mention 
> that this module goes for $3.02?
> Jim
>
> Logic: Method used to arrive at the wrong conclusion, with 
> confidence.  Murphy
>
>
> -----Original Message-----
> From: Jack Antonio <scr287 at att.net>
> To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
> Sent: Fri, Jul 22, 2022 3:42 pm
> Subject: [Milsurplus] power supply question
>
> Regarding switching type computer and modular power supplies.
>
> Will they work on 400 Hz , or even possibly 800 Hz power?
>
> Off hand, you'd think so. as generally they rectify the AC line to make
> DC, but is there something that ties them to strictly 60 Hz?
>
> Thought I'd ask before I blow something up.
>
> Thanks
>
> Jack Antonio
> WA7DIA
>
>
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