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

[Peter Gottlieb]

You can only do this if they’re isolated. 


Peter

> On Apr 18, 2018, at 11:55 AM, Scott Robinson <spr at earthlink.net> wrote:
> 
> 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
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html