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6v inverter circuit

Discussion in 'General Electronics Discussion' started by vinod chandran, Nov 23, 2012.

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  1. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi all,
    Somebody please help me to find a 6v to 220v inverter circuit. All i need to light a 11w CFL from a 6v 4.5Ah battery.
    -Vinod chandran
     
  2. davenn

    davenn Moderator

    13,710
    1,911
    Sep 5, 2009
    hi vinod
    did you try putting "6v to 220v inverter circuit" into google
    there are dozens of hits many with circuit diagrams :)

    Dave
     
  3. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi davenn,
    Thank you. I just found a simple circuit but it is in 12v supply. I am attaching the image. Please look. I just tested it and it is working well with 12v battery. So What changes do i need to connect this circuit with 6v battery?. I know i need to change the transformer into 6-0-6 .Battery Ah is 4.5. Please help me.
     

    Attached Files:

  4. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    You will need to change the transformer as you say.

    6V will be insufficient to turn the fets fully on so the chip should be fed from two diodes connected to the fet drains. There will almost certainly be enough voltage to get it started.
    Put an electrolytic on the 4047 supply - you should have this on the 12V circuit also.
     
  5. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi duke37,
    Thanks a lot. But i can't understand your idea. So please draw a diagram of your idea.
     
  6. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    You should have an electrolytic capacitor on the 6V input since the inductive current will go in both directions under light load.

    The 4047 should have a smooth supply.
     

    Attached Files:

  7. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi duke37,
    Thank you. Due to the language problem i am attaching an image of what i understood from your image. Please correct if any errors found.
     

    Attached Files:

  8. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    You need a capacitor (10uF?) across the 4047 to give a smooth supply or it may get false triggering from the large currents elsewhere in the circuit.

    The fets seem to be upside down. They should be source to ground, drain to transformer.
     
  9. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi duke37,
    Thank you for the reply. Let me try your idea. I've ordered a 6-0-6 3A transformer at my local winding shop. If this experiment is success, then i am able to make an inverter in 780 INR(14$)
     
  10. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Out put voltage is low

    Hi all,
    I tried this small inverter circuit (plz look image). But the out put is 66v AC. The transformer in this circuit is from an old 600VA ups and it's amperage is unknown. Any way when connecting this transformer to 230AC , i got a 6.5v AC in secondary. So i connect this to my circuit. Somebody please tell what is wrong with this circuit and how to fix this.
    -Vinod
     

    Attached Files:

  11. Harald Kapp

    Harald Kapp Moderator Moderator

    10,770
    2,426
    Nov 17, 2011
    My guess:
    Your circuit oscillates in the kHz range. The transformer is probably designe dfor 50...60 Hz operation. Due to the high frequency the current through the transformer will not rise enough to deliver the power needed to drive 230 V at the output.

    Reduce the frequency of the MV to 50...60 Hz.

    Also note that the energy stored in the transformer duricng Q1's on-time needs to be bleeded when Q1 is turned off. Otherwise a high negative voltage will occur at Q1's collector. Put a diode paralel toi the transformers switched winding, cathode to P1, anode to P2.

    Harald
     
  12. Harald Kapp

    Harald Kapp Moderator Moderator

    10,770
    2,426
    Nov 17, 2011
    By the way: I merged your two threads for the same topic. Please stay within one thread as long as the topic doesn't change. Only open a new thread for a new topic.

    This makes life easier for all of us.

    Harald
     
  13. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi Harald Kapp,
    First of all let me say thanks to you for giving a very helpful reply. I am sorry for posting this as two threads. I thought that posting as a separate thread will give more attention and replays. Any way let me try your idea. Thank you once again.
     
  14. vinod chandran

    vinod chandran

    192
    2
    Jun 21, 2011
    Hi Harald Kapp,
    Your idea is not working. I just reduced the frequency. This is the component value.
    R1= 1.5K, R2= 100K, C1= 1uF. An online frequency calculator shows me that when using these
    components, the result will be-
    T1 High output(sec) =0.0703395
    T2 Low output (sec) =0.0693
    T1+T2 Period (sec) =0.1396395
    Frequency (Hertz) =7.1464019851116625
    Duty Cycle (percent) =50.37220843672456.
    And the output is still 73v AC. then i connect a 1N4007 into the transformer as you said. then output
    voltage become low. What to do?.
     
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