cupoftea
Advanced Member level 5
Hi,
Will we have EMC problems with our 7W offline flyback if we put all of the mains input filter (common mode and diff mode) downstream of the mains diode bridge?
(only two Y caps will be upstream of the diode bridge)
Doing this, enables us to have an inrush resistor shorted out by an NFET rather than a relay.
Also, there is sometimes inrush into the Diff mode caps of the EMC filter, so the way it Is shown here means that the inrush into the EMC filter is also limited.
..as the attached LTspice sim and PDF schem show.
Will we have EMC problems with our 7W offline flyback if we put all of the mains input filter (common mode and diff mode) downstream of the mains diode bridge?
(only two Y caps will be upstream of the diode bridge)
Doing this, enables us to have an inrush resistor shorted out by an NFET rather than a relay.
Also, there is sometimes inrush into the Diff mode caps of the EMC filter, so the way it Is shown here means that the inrush into the EMC filter is also limited.
..as the attached LTspice sim and PDF schem show.
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