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Switch Mode Power Supply: a varistor between Earth and thesecondary's ground

Discussion in 'Embedded' started by Enrico, Nov 17, 2010.

  1. Enrico

    Enrico Guest


    I'm developing a 20-watt switch mode power supply. The PWM controller
    is the Viper 27.
    So far everything is going fine.

    I noticed on a competitor's power supply the presence of a Disc
    Varistor (56 Volt) between Earth and the ground of the secondary.

    This is quite surprinsig for me.

    Can anybody explain me the reason of that choice?

    Thanks in advance,
    Enrico, Nov 17, 2010
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