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How to Build an Inverter[satire]

Discussion in 'Misc Electronics' started by Jon G., Mar 6, 2005.

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  1. Jon G.

    Jon G. Guest

    [satire]
    How to Build an Inverter

    I don't know for sure, since I've never built one. Someday I
    hope to, though. I want to make one to hook up to a running car.

    First I need a fast switch that swaps the teminals of the
    battery from +/- to -/+ 60 times a second. The switch has to
    handle 100 amps. For that I'd use two 1200watt SCRs. To tell
    the SCR's when to turn on and off, I'd use a 555 timer rigged
    for a 60Hz square wave. Then I'd run it through a 1:10
    transformer, with the primary made of heavy wire able to handle
    100 amps at 12 volts ac. The secondary would then put out 120
    volts ac at 10 amps. Stick in a couple of capacitors here and
    there, for the advanced signal conditioning model.

    So there you have it. A rough 1200 watt inverter for $20 worth
    of parts, that you can't buy for under $1000.00
    [satire]
     
  2. Ken Taylor

    Ken Taylor Guest

    Jamie, you missed the word 'satire' in the subject. Mind you, Jon's post
    misses the mark because he actually uses more detail of how the project is
    to be done than your average clueless newbie/innocent beginner (delete as
    necessary). Normally it's more like 'switching it somehow' and 'a cheap
    transformer', etc.

    Cheers.
     
  3. Jamie

    Jamie Guest

    you some options.,
    don't use SCR's because how are you going to switch them off? further
    more, you may not even be able to keep them on with a narrow pulse if
    you don't have a minimum non inductive load and when you do that, it
    will stay latched on.
    you could use GTO's, those will let you switch off and on but still
    need that non inductive load with narrow pulse triggers.
    i suppose you could you a square wave at 60 Hz to directly control the
    gate.
    but in either case, you would need a negative pulse to turn off the
    GTO..

    i think the best route would be using some power Fets in a push pull
    or H-bridge format from a square wave inverter driver.

    regulation will be poor how ever. you really want to keep the
    FETs saturated to keep heat down in them.

    the best thing to do is make your self a sine wave inverter using PWM
    into a high freq xformer.
    P.S.
    PWM = Pulse width Modulation

    normally a sine wave reference is used with an amp to regulate
    voltage that drives a PW timer which in turn may operate a flip flop
    type circuit to select the pairs of trannies to drive.

    its just a thought..
     
  4. Fred Abse

    Fred Abse Guest

    On is easy, off not quite so easy. Reminds me of the story about the guy
    in the lab asking the guy at the next bench "What sort of turnoff time are
    you getting with that SCR?". Back came the answer "I've been trying to get
    it off since half past eight this morning"
     
  5. Jon G.

    Jon G. Guest

    Thank you, Jamie. You know more than I do. I found a web site
    with schematics for various inverters. I don't understand how
    they work, but it may (or may not) be cheaper to buy the parts
    and build one, than to buy one outright.

    http://www.theverylastpageoftheinternet.com/forsale/plans/inverter/inverter.htm

    Jon
     
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