general question when a mosfet on primary of transformer is burned

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  • Wolf1977
    Senior Member
    • Jul 2023
    • 59
    • Greece
    #1

    general question when a mosfet on primary of transformer is burned

    hi
    in a welding machine i had a mosfet and four components wich connect with it burned
    i ordered all the damaged components and replace it but when i put the device on the plug all the components burned again i had tested before and i had not shunts
    i dont understand whats happen wrong
    more particular on the schematic q11p01 mosfet q11p02 tranzistor
    three paralel resistors had burned q11p07 zener shunt q11p08 open
    when i changed all these shunts q11po7 mosfet and tranzistors
    maby the transformer has problem on your opinion or something on secondary or bad quality elements
    the schematic can be downloaded from bellow address
    Last edited by Wolf1977; 08-19-2023, 01:49 PM.
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