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Trouble with Change of Transformers for Rectifiers designed in US when used in ASIA

Discussion in 'Electronic Basics' started by anil.deshpande, Nov 13, 2004.

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  1. I have a tape recorder from US whose rectifier takes 30 volts 1amp
    which is
    realised using 120 volts 60 hz step down transformer.
    So I took an Asian Transformer Input 230 volts 50 hz and output is 30
    volts 50 hz 1 amp. The transformer is getting heated and sometimes
    burn.
    What I have observed is if the tape is not running and just connected
    to the supply with switch on the socket point of the tape is very hot.
    Need help
    Thanks
    Anil Deshpande
     
  2. Anil,

    Secudary current of a transformer is usualy specified for continuous load
    i.e. a heater or a lamp. A rectifier is all but such a load. It only draws
    current peaks at the top of the sines of the voltage. So if you want to draw
    1Adc from your bridge rectifier, your transformer should be able to provide
    at least 1.4Aac continuous current.

    petrus bitbyter
     
  3. Clarence

    Clarence Guest

    Here lies the problem "Asian Transformer." The design of many replacement
    transformers from Asia allow a higher temperature rise, or use as little Iron
    as they can get away with without blowing a fuse. If you must use an Asian
    Transformer derate it by at least 50%. So for a 1 amp output get a transformer
    rated at 1.5 amperes minimum. 2 would be better. However it will still run
    very warm. Get a US or EU made transformer and there will be an obvious
    difference!
     
  4. Jamie

    Jamie Guest

    and here lye the problem.
    did you measure to make sure 30 volts
    at the output of the rectifier is what you
    really should get? its possible the
    secondary is to high.
    you must remember that the voltage
    your getting is in RMS. after being
    rectified and filterd its going
    to be higher.
    the Peak is around 42 volts.
    you mite want to check this.
     
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