Inverter DC to AC

Discussion in 'Homework Help' started by aq_rules, Jul 10, 2010.

  1. aq_rules

    Thread Starter Member

    Oct 28, 2009
    168
    0
    I have 12VDC 7Ah Battery
    I want a 220AC inverter which can run my laptop and other low powered devices....my laptop charger is of 65watts 13.6VDC needs input of 220ac.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Is this an assignment?
     
  3. tom66

    Senior Member

    May 9, 2009
    2,613
    213
    If you don't need much power (<500W), you can try this circuit:

    http://www.aaroncake.net/circuits/inverter.asp

    The capacitor selection is vital - you will probably have to go through several sets before you find the right one.

    For 230Vac, just change the transformer.

    If you are only powering a laptop charger you can get away with using 115Vac most of the time because most laptop chargers are universal models, they will work on a wide range of voltages.

    Beware that my laptop charger is a Dell charger and it never worked off a modified square wave inverter, so I find it unlikely that a purely square wave inverter would work better. It *could* have been overloading the inverter, it was a 150W inverter and I had a 95W charger. I find it unusual why it didn't work, but it could have just been that the charger wasn't that efficient, and was consuming more than 150 watts.

    You will want a battery monitor circuit or you could discharge your battery too much which can damage it. I also suggest putting a large value high ripple current capacitor across the battery terminals to improve the output.
     
  4. aq_rules

    Thread Starter Member

    Oct 28, 2009
    168
    0
    yea i also have a dell laptop..65w dell charger..
     
  5. tom66

    Senior Member

    May 9, 2009
    2,613
    213
    I reckon you should buy a cheap 150W inverter and see if that works. If it doesn't you don't have much chance.

    If you're only wanting to charge a Dell laptop (and run nothing else) consider a DC-DC converter to step the 12 volts to the 13.6 volts the laptop requires.
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,535
    A commercial unit is much cheaper in the long run. I see where you got that design for the other thread now. I remember seeing something very similar over 20 years ago. Nowdays we can do a lot better.
     
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