Common-mode inductor resistor filter circuit 3

It should be pointed out that when the rated current is high, the wire diameter of the common mode choke coil should also be correspondingly increased in order to withstand the high current. In addition, increasing the inductance appropriately can improve the low-frequency attenuation characteristics of o c, and C2 adopts thin film capacitors with a capacity range of 0  Ol~0.47 pLF， Mainly used to filter out serial mode interference. C3 and C4 are connected across the output terminal, and the midpoint of the capacitor is grounded, which can effectively suppress common mode interference. oC3 and C4 can also be connected in parallel at the input terminal, still using ceramic capacitors with a capacity range of 2200 pF~0.1 PLFo. To reduce leakage current, the capacitance should not exceed 0.1 douF, and the midpoint of the capacitor should be connected to the ground. The withstand voltage values of Cl~C4 are all 630 V (DC) or 250 V (AC)   diode