On Wed, Mar 10, 2010 at 7:34 AM, Dwayne Reid <dwayner@planet.eon.net> wrote:
> This version uses a standard capacitive-type power supply. =A0However,
> the circuit topology is quite different in that the relay portion of
> the circuit has one power supply and the rest of the electronics has
> a separate supply. =A0The two supplies are in series - I have lots of
> voltage available but limited current. =A0Operating range for this
> particular product is 90 through 150Vac but there is no reason that
> the power supply wouldn't do 90 through 240Vac.
>
> It works rather well and I hope to publish the details in EDN or
> Electronic Design sometime soon.
>

I see. If it is pure 50/60Hz AC, another poorman's DC/DC
converter can be used. Supertex used to make two ICs,
SR036 and SR037 which use the same mechanism to
use the AC crossing as the base of switching regulator.
http://www.futurel.bg/datasheets/4/SR03.pdf
You can make your own based on discrete components
as well.

The efficiency is not that high but much better than
the linear one. Supertex makes a high voltage
linear regulator LR8 for SMPS startup.
http://www.supertex.com/pdf/datasheets/LR8.pdf


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Xiaofan http://mcuee.blogspot.com

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