Filtering differential mode and common mode interference's circuit

The utility model provides a filtering differential mode and common mode interference's circuit relates to and detects technical field. Signal inlet is equipped with sinusoidal difference signal inletand cosine difference signal inlet, and the coupling capacitance is established ties with signal inlet, coupling capacitance output and divider resistance's branch press bond, and divider resistance's partial pressure end is connected with the sampling chip U1 input, and the coupling capacitance output is connected with common -mode capacitance, common -mode capacitance ground connection, differential mode capacitor and sampling chip U1 input connect in parallel. The utility model provides an among the prior art to motor rotation number detect the sampling incoming signal noise that obtains with feedback circuit big, the technical problem that protect not have sampling chip. The utility model discloses beneficial effect does: differential mode interference and common mode interference that the signal of filtering