Does the common mode inductor have the effect of storing energy

What is a common mode inductor?

The common mode inductor is an integral part of most EMI filters; its very high impedance over a wide frequency range suppresses high frequency power supply spikes. power supplies gener-ate two types of noise: common mode and differential mode. Differential mode noise (Figure 1a) follows the same path as the input power.

Should we use new materials for common mode chokes & storage inductors?

In summary, using newer materials for common mode chokes and storage inductors can help save weight. Additionally, these materials have a higher saturation flux density and can be used for a much higher frequency range.

Can Com-mon mode inductors be Satu-rated?

Popular opinion states that com-mon mode inductors cannot be satu-rated; the differential mode flux within the core cancels and the com-mon mode flux is so low that it is not a concern. Unfortunately, this is not entirely true. It has been shown by others [4,5] that some amount of dif-ferential flux exits the core from each winding.

What is the difference between a common mode inductor and a capacitor?

The induc-tors become high impedances to the high frequency noise and either re-flect or absorb the noise while the capacitors become low impedance paths to ground and redirect the noise away from the main line (Figure 2) . To be effective, the common mode inductor must provide the proper impedance over the switching fre-quency range.

Does line current affect Com-mon mode inductance?

Inductance vs Line Current. 24%, respectively), while the H material dropped a little further (15% and 35%). These results show that the com-mon mode inductance is affected by the leakage inductance and that core saturation is possible under peak line currents.

What is the difference between common mode and differential mode inductors?

Herein lies the great difference between common mode and differ-ential mode inductors. To prevent saturation, the differential mode in-ductor must be made with a core that has a low effective permeability (gapped ferrites or powder cores).