Re: Converting 0-2200Vac to 0-10VDC

On Tue, 23 Oct 2007 14:15:15 GMT, Ecnerwal
<LawrenceSMITH@xxxxxxxxxxxxxxxxxxxx> wrote:

In article <1193115355.000129.144140@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Devendra <devendra.jogdeo@xxxxxxxxx> wrote:

I am designing a circuit which will convert a 0 to 2200Vac, 50/60Hz
voltage to 0-10VDC signal.

Designing a transformer with 2200Vac primary and 10Vac secondary is
one solution, but the transformer will be very bulky!!

You need a "signal" not "power", according to your post, so a simple
resistive divider should serve to get the AC down to a workable voltage,
and then you can rectify it with low-voltage diodes. Hint - putting many
resistors in series is often an easier way to avoid breakdown than
searching out special high voltage resistors. Solder them end to end on
perfboard or in a plastic tube. Keep the value high enough that the
power dissipated at maximum voltage does not come anywhere near the
power rating.

2200VAC 50/60Hz sounds like an electrical distribution voltage. My
answer would be to buy an appropriately rated and approved voltage
transducer. The voltage and probably the available current will turn
your body into something resembling overdone tandoori chicken if it
comes into contact, either directly or through an improperly designed
transducer. The heart of such a transducer would likely be a very
conservatively designed line-frequency transformer.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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