cordless phone charger redesign 120v to 230v

Discussion in 'General Electronics Chat' started by mugunthans, Feb 8, 2011.

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  1. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    Hi,
    I wanted to modify the input power range from 120v to 230V Panasonic cordless phone charger SMPS type, which is currently supporting only 120v AC.
    I have opened the charger and tried to find the similarity with Nokia charger(100-230v), but not much information.
    It has UTC MJE 13003L - High Voltage Fast-Switching NPN Power Transistor. Also other SMD component 6pin DIP but unable to find #,manufacturere details but it shows LĀBU

    Fuse resistor - 10Ω
    Input filter capasitor - 4.7μF 200v
    Input Inductance - 470mH

    Can anybody thro' some light on this.

    Thanks in advance,
    Mugunth
     
  2. tom66

    Senior Member

    May 9, 2009
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    No chance on converting it; you will have to replace so many components it won't be worth it. You could try comparing the output voltage of the Nokia and Panasonic chargers; if they are compatible, you could either replace the tip on that one, or buy a cheaper one which does the same and replace the tip too.
     
  3. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    Thanks, but the cost of the BOM is less than a new local adaptor when I enquired.
    So thought of changing the components....
    I know that i have to change the Capasitor 4.7μF200v to 4.7μF400v, L1 to 1mH and FR to 20Ω
    I guess base voltate to 13003 also to be modified.
    But rest no idea. Is it mandatory to replace the transformer ?
     
  4. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    Would it be possible to achieve by double the value of each components at primary side, except the transformer ?

    can anybody thro' some light on it please?
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Doubling won't help, it won't work.
    I have too started that kinda venture.

    I am checking it as time permits, I have the pics will upload it as I get time.
     
  6. Adjuster

    Well-Known Member

    Dec 26, 2010
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    Get a new charger! If you mess about trying to modify the old one you are unlikely to succeed. You will probably waste money burning out a bunch of components, and you could well have an accident.

    Even if the charger seems to be working after modification, it may not be safe: is it worth risking burning the house down?
     
  7. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    It has very less number of components. 9 resistors, 5 capasitor, 1 inductor, 4 diode, 1 transistor. I'll post the pic of the PCB. It has very simple design. bcs of that i tempted to redesign.

    anyway thanks for your response...
     
  8. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    The other reason for redesign is the cost of the OEM charger is 1/3 of the product cost :eek:
    But local charger is also available.
    when i look at the components inside, even if i change all the part, it will be lesser the cost than a local transformer charger.
     
  9. debe

    Well-Known Member

    Sep 21, 2010
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    At $10 for new phone chargers cant see the point realy. Pic of a Nokia phone charger using a MJE3003 transistor & is 100v to 240v input. These plug packs can sometimes be purchased for as low as $5 for superseeded models at Supermarkets.
     
  10. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    I have attached the PCB and the components photos. Now it will be easy to get an idea for redesign.
     
  11. debe

    Well-Known Member

    Sep 21, 2010
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    I suspect that that T/F is not designed to handle the higher voltage.
     
  12. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
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    There's a little IC there, you'll just damage the charger so buy a new one.
     
  13. mugunthans

    Thread Starter New Member

    Jun 23, 2009
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    Thanks for your suggestion but a healthy response would be greatly appreciated.
     
  14. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    Compared to an unhealthy response? I'll type slower next time.
     
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