The invention relates to an improved switched mode power supply (SMPS) circuit of fly-back and/or forward type for industrial electronic appiication being connectable to an input supply voltage (E), comprising an unisolated driver (2,3) connected to a first solid state switching device of MOSFET or IGBT switches via two halves (RG1, RG2) of a gate circuit resistance, said first switching device being operably connected to a second solid state switching device of MOSFET or IGBT switches; a fly-back inductor and/or forward converter transformer (4) disposed between said first and second switching devices. An isolated gate driver (5,6) is interposed between said switching devices for generating isolated gate pulses capable to withstand a voltage potential difference which the source terminals of said sol id state switches being subjected to, the isolated gate driver (5,6) comprising a capacitor (C), plurality of resistances (Rl, R2, R3), and at least one voltage clamping device (zl).
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