Why The Step Down Transformers Available In Market Has Very High Output Voltage?

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    Abhimanyu Rathore

    Question by Anirvan Kule: Why do the step-down transformers available in the local market has a very high output voltage (AC) than their rated voltage? Suppose a 0-12 V, 3 Ampere transformer gives up to 16 or 17 volt AC on secondary side which peaks to around 23 Volt after filtration at no load while it should be maximum 17 Volt dc peak if it was 12 V AC?

    Abhimanyu Rathore

    Comment by Akshay EFU: Because non-switching transformers work by induction, the open load voltage will always be higher than the target voltage. Connecting a load creates a voltage drop which will be equal to the rated output voltage. Try switching to a switched mode power supply for a regulated voltage.

    • This reply was modified 7 months, 2 weeks ago by Abhimanyu Rathore.

    Lol, you just copied my response off Facebook and pasted it on here.
    Please cite your sources to avoid stealing others’ work.
    OP: https://www.facebook.com/designelectronics/photos/a.178186675538491/5362741503749623/

    Abhimanyu Rathore

    We have not stolen any of your work, your name was written in Kannada and our website does not accept other formats except English. We are editing the comment with your name.


    Thanks for the resource. I will check this out!


    Thanks too for the resource. I will check this out!



    Since transformers do not work by induction, the open-load voltage will be higher than the target voltage. Connecting the load produces a voltage drop that will equal the supplied output voltage. Try switching to an adjustable voltage regulator.

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