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Need with homemade inverter with tl494

Discussion in 'General Electronics Discussion' started by Aplicant, Nov 17, 2016.

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  1. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    I am new here. I made inverter 12 v to 220vdc with tl494 but when i connected a load (resistor)with 260 ohm to output side ,output voltage dropped down from 300 v to 100v
    Please help me
    I need 300 vdc without load and with load
    Ic : tl494
    Operation pull -push
    Frequency 33 khz
    Transformer EI33A-191 JX
    Output voltage with capacitor :300vdc
    Output capacitor:400 v 47uF
    Output diode bridge :4 diodes HER305
    Transformer turns primary:3 turns secondary:33 turns
    I can't load picture(circiut) because of larger file than 1 mb
    Thanks in advance
     
  2. davenn

    davenn Moderator

    13,674
    1,892
    Sep 5, 2009
    reformat it's physical and kb size to suit the forum ... use jpg or gif file format

    without it, it's pretty difficult to know what you may or may not have done wrong
     
  3. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    image.jpeg
     
  4. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    image.jpeg
     
  5. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    The dodes look to be correct.
    There is no information on the fets.
    100V into 260Ω is about 400mA. Whic needs 4.4A input. Will the fets do this?
    Does the capacitor have a low ESR?
    Does the supply have a low impedance, try up to 0.1F close to the transformer.

    You could measure the voltage across the primary of the transformer, a meter should work reasonably well on 33kHz.
    Is the TL494 poviding a dead zone between each fet turning on?
     
    Aplicant likes this.
  6. Alec_t

    Alec_t

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    Jul 7, 2015
    Perhaps the transformer is unsuitable. What is its saturation current rating?
     
  7. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    Thansk for all information
    Output voltage : 300vdc
    Transistor: IRF3205
    Output capacitor :400v 47uF
    Supply : 12v 60A car battery
    How to connect 0.1uF
    Please help me
    I couldn't use two error amplifiers in ic
    Are Two error amplifiers very important for this problem or not
    Transformer EI33A
    I think there is no enough current on output side

    What must i do to create max 10 amps and max 20amps on output side.
    What does output current belong to exactly ?
    I don't know if duty cycle or frequency
    For instance: 220 to 13.8vdc charger 20 amps or 30amps


    Will i change it? I haven't any information about transformer EI33A
    Please send me any solutions
    I am new in electronics
    Please help me anyway
    Thanks in advance
     
    Last edited: Nov 17, 2016
  8. Audioguru

    Audioguru

    3,002
    673
    Sep 24, 2016
    20A at 300V is 6000W (!). The circuit might have a good efficiency of 80% so the low voltage side must produce 7500W (!).Then the poor little Mosfets must conduct 7500W/12V= 625A (!). Impossible.

    Even an output of only 3A at 300V (900W) might be impossible for that simple circuit because the low voltage parts must produce 1120W with a current in the Mosfets of 1120W/12V= 93.3A and the transformer must also be able to handle this very high current.
     
    davenn likes this.
  9. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    Thanks for useful information
    Please say to me what output current belongs to?
    And output voltage drop?
    If you have good circuits about inverter with full information , please send me it
    Thanks in advance
     
  10. Audioguru

    Audioguru

    3,002
    673
    Sep 24, 2016
    6000W is a lot of power. What is the size of the neighbourhood that uses all that power?

    Output current is caused by the resistance of the load. Lower resistance causes higher current.
    Output voltage drop occurs when the circuit is so simple that it is missing negative feedback and is caused by the resistance of the wiring, Mosfets, transformer and battery.
    If I needed an inverter I would simply buy one, not design and make one.
     
  11. Alec_t

    Alec_t

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    Jul 7, 2015
    Your inverter transformer is a step up one. If I've understood you correctly, you will use a 12v 60Ah battery to supply it so as to generate 220V which you are then going to use to power a battery charger for charging a 12V battery? What's the point? :confused::rolleyes:. If this is an over-unity attempt it ain't gonna work.
     
  12. davenn

    davenn Moderator

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    Sep 5, 2009
    thread closed

    it isn't going anywhere useful as the OP, Aplicant, doesnt appear to have enough understanding of basic electronics
    let alone build a high power inverter

    @Aplicant, if you really need a high power inverter, buy one


    cheers
    Dave
     
  13. Aplicant

    Aplicant

    18
    3
    Nov 16, 2016
    Thanks
     
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