[ARC5] Prelim comments on a DC - DC B+ converter.

[Scott Robinson]

And Scott further comments:

The observation below tempts one to put two of them in series to get a 
reliable 370V. If you do this, be sure to put a parallel reverse diode 
across each output, to prevent the one that starts last (they'll never 
start at exactly the same time) from getting a large backward voltage 
across its output.

fWIW,

Scott Robinson

On 4/18/18 4:46 AM, David Stinson wrote:
> 
> 
> -----Original Message-----
> From: Leslie Smith
> Subject: [ARC5] Prelim comments on a DC - DC B+ converter.
> 
>> Testing a DC-DC step-up converter.
>> ... The supply is rated at 40W; I want to see if the unit can deliver ...
> 
> I have tested this.  If one reads the "fine print"
> in the listing, it says that the power-delivering
> capacity drops with higher voltage.  250V into a
> 5K resistor for 2 hours here presented no problems,
> but boosting it to 370V and attempting to power an
> SCR-183 transmitter (about 40 MA, 15W load) was
> instantly fatal.  I respectfully suggest that if one
> uses this supply, to de-rate it to a max of 250V
> at about 70 mills- more than enough for most receivers.
> 
> 73 OM DE Dave AB5S
> 
> 
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