1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

inverter anyone know how to build one

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by bubbat, May 13, 2007.

  1. Hero999

    Hero999 Banned

    Joined:
    Apr 6, 2006
    Messages:
    14,902
    Likes:
    79
    Location:
    England
    Don't do it, the mains voltage isn't the kind of thing children should play with.

    Go into school and have words with the teacher.


    On second thoughts, are you talking about a logic inverter?

    Isn't this supposed to be your child's project? They should do it themself.
     
  2. mexzy

    mexzy New Member

    Joined:
    Dec 18, 2008
    Messages:
    6
    Likes:
    0
    please help

    i want to build an inverter precisely 12v,output of 220vac-240vac,of frequency 50-60Hz,power 1.5kva or 2.0kva.pls wud be grateful.i need the a fully understandable circuit diagram with materials i need and any info that wud help.i have tried but am frustrated :(,my nights are unbearable.waiting for ur reply.thanks
     
  3. blueroomelectronics

    blueroomelectronics Well-Known Member

    Joined:
    Jan 21, 2007
    Messages:
    12,536
    Likes:
    168
    Location:
    Toronto, Canada
    Just buy a UPS. You can't build one for less.
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    32,437
    Likes:
    933
    Location:
    Canada, of course!

    Then don't sleep in the desert. At the North Pole? South Pole?
     
  6. mexzy

    mexzy New Member

    Joined:
    Dec 18, 2008
    Messages:
    6
    Likes:
    0
    inverter

    hello,this is my project.12v,220v-240v,50-60hz1.5kva or 2.0kva.pls need help wud be grateful.i know its costly to build but am an electrical student and i need to submit on time.need an understandable circuit diagram.thanks as u reply.merrychristmas and happy newyear.
     
  7. blueroomelectronics

    blueroomelectronics Well-Known Member

    Joined:
    Jan 21, 2007
    Messages:
    12,536
    Likes:
    168
    Location:
    Toronto, Canada
    Did you bother reading the previous posts in this thread?
     
  8. duffy

    duffy New Member

    Joined:
    Dec 22, 2008
    Messages:
    2,618
    Likes:
    73
    Location:
    nortern 'sconsin
    >>a large bank of deep cycle batteries

    Are all the "request for inverter" posts like these from people in India? I've seen some scary pictures of rooms full of batteries, women carrying batteries around on their heads...
     
    Last edited: Dec 29, 2008
  9. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    32,437
    Likes:
    933
    Location:
    Canada, of course!
    3rd world countries have electricity that barely works. People steal electricity there and they even steal the electrical distribution wires!
    So the people use inverters to make their own electricity.
     
  10. ralobro

    ralobro New Member

    Joined:
    Dec 21, 2009
    Messages:
    1
    Likes:
    0
    I am about to build a test solar panel out of 1/2 solar cell pieces 3x6,im getting 108 pieces!! I havent got them yet so im collecting all the information i can before i start. I have a 400w,200w and a 90w DC to AC converters i know these will work for my project.As well as 2 deep cycling 12v batteries,I just want to power my greenhouse wich uses 240W!but my question is i have an old generator 3000w can i use the power board to convert battery power to AC this is for a future project!! thanks ralobro
     
  11. mneary

    mneary New Member

    Joined:
    Feb 27, 2007
    Messages:
    4,502
    Likes:
    67
    Location:
    California USA
    Did you bother reading the previous posts in this (until now, old and dead) thread?
     
  12. gary350

    gary350 Well-Known Member

    Joined:
    Dec 28, 2005
    Messages:
    1,097
    Likes:
    53
    Location:
    Murfreesboro, TN 37129 USA
    Some things are not practical to build and this is one of them. I bought a new 2KW DC to AC inverter on ebay for $78. 12 volts DC in 120 volts AC out. There is no way I could build one for that price. You have to watch ebay like the stock market if you don't see what you want this week or next week just keep watching it will be there sooner or later.
     
  13. kwame

    kwame Member

    Joined:
    Mar 26, 2010
    Messages:
    248
    Likes:
    0
    500 watt power inverter

    Hi i want to build a 500 watt power inverter.I want to learn how you built yours.
    I want to know how you built your 500 watt inverter.
    Thanks
     
  14. RCinFLA

    RCinFLA Well-Known Member

    Joined:
    Jul 23, 2009
    Messages:
    1,065
    Likes:
    31
    Location:
    FLA, USA
    Here is a schematic of a 300 watt modified sinewave I built about 20 years ago before there was H-bridge driver IC's available to make the job much easier.

    The design of the ferrite transformer is the most involved piece.

    For 240 vac instead of 120vac the transformer has to be higher turns ratio to yield about 310 vdc. Output MOSFET's must be 400v breakdown.
     

    Attached Files:

  15. kwame

    kwame Member

    Joined:
    Mar 26, 2010
    Messages:
    248
    Likes:
    0
    complicated

    The schematic looks very complicated.It is beyond my head.
     
  16. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,205
    Likes:
    640
    Location:
    Derbyshire, UK
    Pretty straightforward - look at it a section at a time.

    However, it is a pretty old way to do it, and class-D with true-sinewave would be preferred nowadays.

    As already suggested, it's far cheaper to just buy one.
     
  17. lillian

    lillian Member

    Joined:
    Oct 2, 2011
    Messages:
    37
    Likes:
    0
    hello my friend did you get this circuit working. I have been trying it for weeks dont know where I go wrong please reply so we can make a link . thank you
     
  18. duffy

    duffy New Member

    Joined:
    Dec 22, 2008
    Messages:
    2,618
    Likes:
    73
    Location:
    nortern 'sconsin
    LOL! The zombie inverter thread, started five years ago and keeps coming back to life.

    Lillian - did you build the one from the pdf file RCinFLA posted, or the one Bubbat posted? If it was the one from Bubbat, please note the comment from Nigel directly below it where he says it doesn't work.
     
    • Like Like x 1
  19. lillian

    lillian Member

    Joined:
    Oct 2, 2011
    Messages:
    37
    Likes:
    0
    Thank you for your reply I am not sure which file someone sent me the file I will upload to you and you check. I have been trying for weeks and not getting through please help me here
     
  20. duffy

    duffy New Member

    Joined:
    Dec 22, 2008
    Messages:
    2,618
    Likes:
    73
    Location:
    nortern 'sconsin
    Let's start by breaking the problem in half - are you getting the +150Vdc?

    If not, the problem is on the SG3525A circuit and associated overcurrent shut-down control (that bank of LM324 op-amps). This steps up the +12V through the transformer to the high voltage needed by the rest of the circuit. It operates at a higher frequency (around 20kHz) than the mains frequency (60Hz). The reason it generates +150V instead of 110V is this is the peak voltage instead of the RMS voltage.

    If you are getting the +150Vdc, the problem is on the side with the 120Hz oscillator and related drivers. This chops up the +150Vdc into the 60Hz cycle (two 120Hz half-cycles) through the mosfets connected to the outlet itself. The mosfets are connected in an "H-bridge" pattern which drives the output through diagonal pairs alternately - Q5 & Q8, then Q6 & Q7.
     
    Last edited: Jun 14, 2012
    • Like Like x 1
  21. lillian

    lillian Member

    Joined:
    Oct 2, 2011
    Messages:
    37
    Likes:
    0
    Thank you Duffy I really appreciate your reply. I am building the inverter in stages. I am building the 150v side of the inverter first. The problem I am having now is the first time I connect power to the circuit i will get a voltage out like 190 or more it takes a little time to reach this. IT starts about 21v and clime up slowly. Whenever I connect the feedback loop the voltage will go down to 155 or so when I power off and connect again I see the circuit starts to draw higher current if i keep it on long it blows the fets. When i disconect the drive to the fets and check the output pin 11 and 14 of the sg3525 i see the voltage of one of them increase to sometimes 8 or 10 voltes and the ic is blown . The frequency remains at what ever it was set at. Just dont know what is happening . Lost a lot of ics this way but I dont want to give up I need your help on this. Tell me should I be getting 20Khz at pin 11 and 14 I know with your hepl I can get it right. thank you
     

Share This Page