Under voltage protection circuit - HV side

Hi!
Can anyone please help in designing under voltage protection circuit with will protect SMPS against power line voltage drop under 40V (KAM0705 module - ( U1 )- https://www.alldatasheet.com/datasheet-pdf/pdf/265967/CHINFA/KAM0705.html). Is this circuit correct? Power supply voltage U= 110V/AC. Important - i can't use conventional transformer in my design.

Can't tell whether your circuit is correct as we don't know all of its intended functions.
Regarding the 40V (I assume you mean 40V rms) cut-off, you could perhaps use a resistor divider network plus zener across the bridge rectifier to sense if the rectifier output is above 40* root 2, then control a power mosfet accordingly to apply power to the SMPS.