How To turn Dc to Ac

Discussion in 'General Electronics Chat' started by szymonm2, Jan 26, 2016.

  1. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    Hello.
    Im trying to find an answer to my problem for the past couple of weeks but I cannot seem to find it.

    How do I turn an output of 0-30V DC (10A) into 0-30V Ac?

    All circuits that I found changed to voltage to either 110v/ 230v...

    Thanks :))
     
  2. Lestraveled

    Well-Known Member

    May 19, 2014
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    Could you be a little more specific. What frequency and waveform? Also some application information would be good.
     
  3. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    I want to power up ac devices such as ac motors. 50hz or 60hz would be good i suppose. I dont have such deep knowledge in alternating current.
     
  4. mcgyvr

    AAC Fanatic!

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  5. Lestraveled

    Well-Known Member

    May 19, 2014
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    Are you getting the DC voltage from batteries?
     
  6. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    No. Im getting power from a lab bemch psu 0-30v 10a
     
  7. Lestraveled

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    May 19, 2014
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    Why not just use a step down transformer off of the mains? Is this school homework?
     
  8. spinnaker

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    Oct 29, 2009
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    Then I assume you already have AC available. Why would you want to convert DC to AC?
     
  9. Dodgydave

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    Jun 22, 2012
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    If the bench psu is yours, you could use the transformer outputs to give you 30V AC, you would need to measure its output and put a couple of yellow 4mm sockets on it. If you want variable ac your better using a variac transformer , otherwise its an inverter.
     
  10. mcgyvr

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    Oct 15, 2009
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    Post detailed information on the motors and other AC loads you intend to power..
    part numbers would be great.. or motor nameplate ratings..

    As stated a transformer off the mains may be a better solution than an inventer and may be the only way based on details of the AC loads/motors..
     
  11. Alec_t

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    Sep 17, 2013
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    Which motors do you have with a 30VAC rating?
     
  12. Kermit2

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    I just happened to have a rather chunky stepdown xformer of 800 VA capacity. 480 to 120 single phase.
    I used it with a variac to get a 0 to 30 volt AC out with 120 AC input.
    It was convenient for testing the two universal motors I scavenged out of old vacuum cleaners. Full voltage on them without a significant load means possible runaway self destruction.
    And they would really spin with 12 volts DC input from a lead acid battery
     
  13. Kermit2

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  14. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    Thr power supply is a switching one and i cant do that... i am using a 12v 20amp psu that is connected to a buck boost converter (ltc3780 to be exact). So kermit2' s schematic would work for sure?
     
  15. spinnaker

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    You never answered the questions. If you have AC available, why not just use a transformer?
     
  16. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    Because I cant desolder my current transformer from the pcb??????????
     
  17. Dodgydave

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    Jun 22, 2012
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    Ok, does it have to be variable AC, or would a fixed voltage work ?
     
  18. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    I was hoping that you could make a variable dc-ac circuit?

    My power supply already has a variable 0-30V Dc range? Would that help in any way?
     
  19. Dodgydave

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    Jun 22, 2012
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    You said your psu is a switchmode type, it will alter the pwm to give a variable voltage, unless you're wanting to make an inverter which to me is a waste, use a small transformer to drop the mains 120V or 230V to 30V to test the motors, or if you want a variable AC supply use a variac.
     
  20. szymonm2

    Thread Starter New Member

    Jan 26, 2016
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    I have a switch mode power supply attached to a buck/boost converter which in return gives me a range between 0-30v 10a. Im basically looking for a circuit that enables me to change Dc to Ac without a voltage change....
     
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