1. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    I am trying to make Dc to Ac (Inverter) For this I have Generated Freq. From Relay (Supplying Ac) & I want to calculate It's O/P Power Without Measuring It's Current (Having no Rating of Transformer)............!


    Pls Help!!:confused:
     
  2. sceadwian

    New Member

    Jun 1, 2009
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    Generated frequency from a relay? You can't use a relay as an inverter, it will fail very quickly.
     
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  3. tom66

    Senior Member

    May 9, 2009
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    Relays are typically rated at 10,000 cycles to 1,000,000 cycles. If you assume best case (1 million cycles) at 50 Hz, your relay will go for 20,000 seconds, or a little under 6 hours. Best case.

    I suggest you investigate H-bridges, half H-bridges (with dual supplies or two batteries) and the dangers of any such inverter. You could also consider buying an inverter. You can pick up a decent 300W unit for under £35 (~$50.) With the time and effort you put into building a low quality inverter, you can pick up a professionally designed modified square wave inverter which will do the job for most appliances.
     
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  4. sceadwian

    New Member

    Jun 1, 2009
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    It won't even last that long tom, switch at 50 hz the relay will never be fully engaged, it will be constantly in a state of contact bounce with lots of arcing. I'd be surprised if it lasted 10 seconds before it welded shut.
     
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  5. retched

    AAC Fanatic!

    Dec 5, 2009
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    I would have to agree.

    It might make an interesting short term light bulb. (That is loud and noisy as all get-out) ;)
     
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  6. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    I have connected relay For some time as I am designing 50Hz From 555 IC But Having problem For giving higher Current From it O/P that's Why I Have Connected relay & Pls, Tell How To Find O/P Power Of It Without Measuring It's Current..........?
     
  7. retched

    AAC Fanatic!

    Dec 5, 2009
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    measure voltage over a resistor to get the current.
     
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  8. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Umm, there are these things called transistors, been around for over 60 years.

    You really need to read through the e-book and gain some basic electronic knowledge, there''s a link to the book at the top of each forum page.
     
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  9. retched

    AAC Fanatic!

    Dec 5, 2009
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    Trans-What-ers? ;)
     
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  10. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    Ok, pls Tell how To find O/P Power of Inverter without measuring Current.......?
     
  11. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    I have Seen some inverter having high voltage I/P While some having High Current why pls Explain.......?
     
  12. marshallf3

    Well-Known Member

    Jul 26, 2010
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  13. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    The O/p decrease at the terminal's of inverter transformer when more load is connected across it pls tell why.......?
     
  14. Potato Pudding

    Well-Known Member

    Jun 11, 2010
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  15. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    How to cure this.......!
     
  16. Potato Pudding

    Well-Known Member

    Jun 11, 2010
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    In simple terms the higher the current the more resistance has an effect in the transformer which reduces the inductive efficiency.
     
  17. Potato Pudding

    Well-Known Member

    Jun 11, 2010
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    Get really big low resistance transformer and you should be able to avoid loading it up.

    It will be expensive.
     
  18. Potato Pudding

    Well-Known Member

    Jun 11, 2010
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    The Power derives from the factors of voltage and current.

    You can use higher voltage to get more power or you can get more power from more current or from more of both.

    Higher current is sensitive to resistance in the circuit.
    The main danger of high current is that it will cause a fire.

    High voltage is sensitive to inductive capacitive reactance in the circuit. The main danger of high voltage is that it can kill people.
     
  19. RRITESH KAKKAR

    Thread Starter Senior Member

    Jun 29, 2010
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    How to find in inductor henry........?
     
  20. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Inductance meter.
     
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