# Converting 0-2200Vac to 0-10VDC

Discussion in 'Electronic Design' started by Devendra, Oct 23, 2007.

1. ### DevendraGuest

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!!

Thanks & Best Regards,
Devendra

D from BC

3. ### Tim WescottGuest

In other words, you've told us about the voltage, now tell us what power
levels you are planning on delivering, and maybe what you're planning on
doing with the power.

If you just want to measure your 2200Vac, you'll have a very different
(and easier) circuit than if you need to deliver 100 amps at 10V.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

4. ### Phil AllisonGuest

"Tim Wescott"

** The OP said it was a " signal ".

** The former is clearly his game.

........ Phil

5. ### DevendraGuest

I want only a signal which will linearly change from 0 to 10VDC for a
corresponding input of 0 to 2200Vac.
The current rating of the output can be as low as 50mA.

6. ### Phil AllisonGuest

"Devendra"

** You can buy 100:1 ratio scope probes that will safely divide such
voltages down to suit a 1 megohm input.

So, maybe use a 100:1 probe, followed by 1M resistive ladder attenuator then
fet op-amp buffer and a nice " rms to DC" converter IC from Analog Devices

Long as your AC voltage " 0 " is securely linked to earth, it should be
quite safe.

........ Phil

7. ### DevendraGuest

I want to have a 0-10VDC signal, may be 50mA is sufficient.

I want to sense 0 to 2200Vac and want to display on a meter, with say
0-10V signal. Current rating is not important.

8. ### DevendraGuest

I want to have a 0-10VDC signal, may be 50mA is sufficient.

I want to sense 0 to 2200Vac and want to display on a meter, with say
0-10V signal. Current rating is not important.

9. ### DevendraGuest

My 2200Vac does not have a "0" point, it comes from a transformer
secondary winding.
So I can not earth any of the points.

Using a 100:1 probe will be slightly costly solution, isn't it?

10. ### Phil AllisonGuest

"Devendra"
"Phil Allison"

Next time say: " I have a floating 2200 volt source".

** Why ever not?

** No - it is a cheap one since you can buys these item " off the shelf ".

What the hell ARE you after ???

A 10 cent solution to a one off hobby problem ??

Or a real design ?

Post more relevant facts - or PISS OFF

Bloody IT wanker.

........ Phil

11. ### DevendraGuest

This is not as a hobby.... it is requirement of my project and I have
to come-up with a cost effective solution.
Please don't get angry and suggest something which can be a permanent
solution.

Oscilloscope probes.... how to keep them fixed to a sensing point,
once for all?

12. ### Phil AllisonGuest

"Devendra Wants they EARTH for Sixpence"

** LACK of REPLY NOTED !!!!!

** I just gave you one.

Sorry it costs more than sixpence.

** Solder the damn tip on to it

tie it down with cable ties

and POT the LOT in poly resin.

....... Phil

13. ### D from BCGuest

Assuming fixed frequency....

Nonisolation nonmagnetic attenuators are:

1)Resistive divider
My memory is a little weak on this ...but I think I recall some
resistor composition that in some cases the V rating may need to be
respected before the P rating.. R would vary with V or maybe it was
some sort of V breakdown effect..but can't recall.
Only recall seeing a special series of resistors for HV use.

2)Capacitive divider
I dunno how great the temp stability and aging is.
I guess use a specific ceramic.
It's great that it produces little heat but may need V surge and I
surge circuits.

3)RC filter
filtering.

Then perhaps buffer 1, 2 or 3 and then drive a diode-capacitor
detector circuit (peak detector).
Depends on required response time.

It'll be challenging to try to skip the buffer..

D from BC

14. ### BenjGuest

Bloody hell? You come in here with a "project" and you don't even know
hurry? Is this your job (in which case you should be PAYING for this
advice) or is it school (in which case you should be doing the
thinking yourself or with your classmates)?
You don't tell us anything about the floating voltages. You don't give
us any idea of the accuracy or stability required. But you want some
miracle cure. I think you are simply abusing the good will of this
newsgroup.

I agree with Phil. We are angry and you should shape up or PISS OFF.

15. ### PeterDGuest

Well, 50 MA at 2200 volts is only a bit over 100 watts. You sure you
need that much current?

16. ### nospamGuest

Posts through Google groups from an IP address in India what the **** else
were you expecting?
--

17. ### neon

1,325
0
Oct 21, 2006
Since you have refused to tell us the power requirements here is a brainer resistor attenuator and rectify the output and there is no such a thing as zero volts except power off.

18. ### EcnerwalGuest

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.

19. ### Spehro PefhanyGuest

2200VAC 50/60Hz sounds like an electrical distribution voltage. My
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

20. ### Frithiof Andreas JensenGuest

Come Now: *That* would be a proper example to other google spammers ;-)