Hi,
1…Supposing an offline, non-isolated SMPS comprises a single diode rectifier. The SMPS is a 17W Buck converter using LNK3902, with 24Vout…The neutral forms the entire ground of the entire Buck circuit, there is no impedance in this ground (ie, there is no inductor, resistor , or ferrite bead in this ground). The neutral is fed right through from mains input, to Buck output as the ground of the whole circuit. This buck supplies a microcontroller and some other circuitry such as 15W BLDC driver....
a)….Is it impossible for such a circuit to ever pass Conducted immunity testing to EN61000-4-6, because it comprises no impedance in its ground circuit (Neutral is the ground)
b)….Is it impossible for this circuit to pass ESD immunity to EN61000-4-2 because it comprises no impedance in its ground circuit? (Neutral is the ground)
c)….Is it impossible for this circuit to ever pass conducted emissions testing to EN standards?, ....since it has no common mode choke, and no Y capacitors
1…Supposing an offline, non-isolated SMPS comprises a single diode rectifier. The SMPS is a 17W Buck converter using LNK3902, with 24Vout…The neutral forms the entire ground of the entire Buck circuit, there is no impedance in this ground (ie, there is no inductor, resistor , or ferrite bead in this ground). The neutral is fed right through from mains input, to Buck output as the ground of the whole circuit. This buck supplies a microcontroller and some other circuitry such as 15W BLDC driver....
a)….Is it impossible for such a circuit to ever pass Conducted immunity testing to EN61000-4-6, because it comprises no impedance in its ground circuit (Neutral is the ground)
b)….Is it impossible for this circuit to pass ESD immunity to EN61000-4-2 because it comprises no impedance in its ground circuit? (Neutral is the ground)
c)….Is it impossible for this circuit to ever pass conducted emissions testing to EN standards?, ....since it has no common mode choke, and no Y capacitors