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Converting 0-2200Vac to 0-10VDC

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

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  1. Devendra

    Devendra Guest

    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!!

    Any other good ideas are welcome. Please help!

    Thanks & Best Regards,
  2. D from BC

    D from BC Guest

    I dunno I or P... Please help!

    D from BC
  3. Tim Wescott

    Tim Wescott Guest

    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

    Do you need to implement control loops in software?
    "Applied Control Theory for Embedded Systems" gives you just what it says.
    See details at
  4. Phil Allison

    Phil Allison Guest

    "Tim Wescott"

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

    ** The former is clearly his game.

    ........ Phil
  5. Devendra

    Devendra Guest

    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 Allison

    Phil Allison Guest


    ** 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
  7. Devendra

    Devendra Guest

    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. Devendra

    Devendra Guest

    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. Devendra

    Devendra Guest

    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 Allison

    Phil Allison Guest

    "Phil Allison"

    ** Your heading & first post said it does.

    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. Devendra

    Devendra Guest

    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

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

    Phil Allison Guest

    "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 BC

    D from BC Guest

    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

    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. Benj

    Benj Guest

    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

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

    PeterD Guest

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

    nospam Guest

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


    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. Ecnerwal

    Ecnerwal Guest

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