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Convert High Voltage AC Signal into Low Voltage DC Signal

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  1. 8th February 2012 02:05 AM #1
    electrousa electrousa is offline

    Convert High Voltage AC Signal into Low Voltage DC Signal

    I need to design a circuit which converts 220V AC signals into 3.3V DC signals.

    The 220V AC signals are part of elevator system which is used to detect every single elevator's status and report to a central control unit or something like that.

    The 3.3V DC signals are to an embedded micro controller which is on my board.

    What I need to do is to find a circuit which converts the 220V AC signals into 3.3V DC signals and finally can be interfaced to my micro controller.

    I have no knowledge on the elevator system so if anyone have advices on how to converts 220V AC signals specially in elevator system to 3.3V DC signals, that will be great appreciated.

    Any general knowledge on how to convert high voltage AC signals to low voltage DC signals are also great!

    Thanks in advance.
  2. 8th February 2012 03:11 AM #2
    ronv ronv is offline
    Maybe a little more info would help.

    Are you trying to detect the presents or absents of 220 volts by converting it to a 3.3 volt dc signal.

    Or are you building a power supply to convert 220 to 3.3 vdc.
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  3. 8th February 2012 07:04 AM #3
    crutschow crutschow is online now
    The easiest and safest way is to use a small transformer. 220V to 2.5V AC would be good but 6.3V AC outputs are likely more common. Just rectify the AC with a diode and capacitor filter, and then reduce that to 3.3V DC with a series resistor and a 3.3V zener diode to ground.
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    Zapper
    Curmudgeon Elektroniker

    --Inside every little problem is a big problem trying to get out.--
  4. 8th February 2012 07:50 AM #4
    Nigel Goodwin Nigel Goodwin is offline
    Super Moderator
    Quote Originally Posted by crutschow View Post
    The easiest and safest way is to use a small transformer.
    Opto-isolators would be easier, safer, and a LOT cheaper
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  5. 9th February 2012 12:09 AM #5
    electrousa electrousa is offline
    The reason I need to convert it to a 3.3 volt dc signal is trying to detect what information is carried through the 220 circuit inside the elevator system. I have no knowledge on elevator system...
    If somebody can describe something about the 220 volt ac interface(like how many wires and how it works etc.) for the elevator system that will be great!
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  6. 9th February 2012 02:45 PM #6
    alec_t alec_t is offline
    I have no knowledge on elevator system...
    In that case how will you be able to interpret any information you detect? Why do you think there is information (as distinct from just power) in the 220VAC?
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    My circuit designs should be regarded as experimental. Although they work in simulation, their component values may need altering or additional components may occasionally be necessary when the circuit is built. Due safety precautions should be taken with any circuit involving mains voltage or electrostatic-sensitive components.
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  7. 10th February 2012 12:21 AM #7
    electrousa electrousa is offline
    You are right from this point, It maybe just a 220V AC power. but the control unit need to judge the status of the elevator through this 200V AC ring.
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  8. 10th February 2012 12:24 AM #8
    electrousa electrousa is offline
    Thanks for the information, I think it is a good idea to using opto-isolator convert the AC to DC easily.

    Any suggests on the part selection and circuit design will be greatly appreciate!
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  9. 10th February 2012 06:26 PM #9
    crutschow crutschow is online now
    But we still don't know the nature of the signal you are trying to detect.
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    Zapper
    Curmudgeon Elektroniker

    --Inside every little problem is a big problem trying to get out.--
  10. 10th February 2012 06:43 PM #10
    KeepItSimpleStupid KeepItSimpleStupid is offline
    Google "I/O modules".
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