# Converting 0-2200Vac to 0-10VDC

• posted

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

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D from BC

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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```
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"Tim Wescott"

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

** The former is clearly his game.

....... Phil

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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.

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"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 like the AD636.

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

....... Phil

• posted

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.
• posted

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.
• posted

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?

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"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

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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?

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"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

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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 The nice thing about this is you get your attenuation + noise 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

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Bloody hell? You come in here with a "project" and you don't even know how to ask a question about it and then you want a free design in a 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.

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

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

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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.

```--
Cats, coffee, chocolate...vices to live by```
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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@interlog.com             Info for manufacturers: http://www.trexon.com```
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"Spehro Pefhany" skrev i en meddelelse news: snipped-for-privacy@4ax.com...

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

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When you say, "0-2200Vac", do you mean one line at 0 and the other at 2200VAC, or do you mean that the RMS value of the incoming ACV can be in a range from zero to 2200V?

Thanks, Rich

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