The magnetic ring has different impedance characteristics at different frequencies. Generally, the impedance is small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring increases sharply. In the EMC engineering design, the magnetic ring has a significant effect and is widely used. Be applicable.
The equivalent circuit of the magnetic ring in the application. L is the equivalent inductance, R is the equivalent DC impedance of the cable, and C is the distributed capacitance generated between the windings. Special attention should be paid to this distributed capacitance, which will reduce the high-frequency filtering performance.