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TMDXIDDK379D: Question about the schematics of the Kit

Part Number: TMDXIDDK379D
Other Parts Discussed in Thread: HVPMSMMTR


I am looking at the schematics of TMDXIDDK379D board, in AC power filter module, which is M1, there is a common mode choke. What is the purpose of using this choke? Is it a transformer to increase the voltage level of the input DC? Also as I understanf, L1 and C2 are for filtering purposes, but I don't see any smoothing capacitor in the diagram. Could you please help me with these questions?