Comparison of actual measurements and simulations for noise filters using common mode choke coils
For actual measurements of a noise filter using the common mode choke coils and the SPICE simulation, we apply a model
using coupling coefficient k for the magnetic coupling characteristics
of the common mode choke coils.
A typical noise filter is comprised of the following configuration. (The equivalent circuit below is a simplified model for the purposes of explanation.)
A typical noise filter is comprised of the following configuration. (The equivalent circuit below is a simplified model for the purposes of explanation.)
The role of each component is summarized below.
L-Com and Cy reduce common mode noise, and L-Com leakage inductance and Cx reduce normal mode noise.
L-Com and Cy reduce common mode noise, and L-Com leakage inductance and Cx reduce normal mode noise.
| Noise countermeasure component | Noise mode |
Role
|
| Common mode choke coil L-Com |
Common | High inductance reflects noise |
| Capacitor Y Cy |
Common | Disperses common mode current (bypass) |
| Capacitor X Cx |
Normal | Disperses normal mode current |
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