selection of common mode inductance parameters

Selection of common mode inductance parameters

1. Input current. Usually, we can indirectly judge the size of the common mode inductor through the input current. The larger the input current, the larger the size of the common mode inductor.

2. Frequency. Inductor manufacturers need to confirm the frequency in the circuit during the selection process, and select different core specifications according to the frequency. If the circuit frequency is high, then we choose nickel-zinc magnetic ring; if the circuit frequency is low, choose manganese-zinc magnetic ring.

3. Impedance. The impedance in each high-frequency circuit is different, so common mode inductor manufacturers often need to select common mode inductors with the same resistance by confirming the impedance in the circuit.

4. Package volume. This point is also a part that we have repeatedly mentioned and must be considered in the actual operation process. The choice needs to be made according to the actual situation. The common mode inductor will have plug-ins and patches, and also have one-piece molding. Choose the right one. The essential.

5. Leakage inductance size. In the common mode inductor processing process, the common mode inductor coils are often wound differently, which then leads to magnetic leakage, which is what we call "leakage inductance" and leakage inductance. We usually use EMI filters. , it can effectively prevent the occurrence of magnetic flux leakage.