TiVECO TVPS450 Power Supply Review
Transient Filtering Stage
Contents
As we have mentioned in other articles and reviews, the first place we look when opening a power supply for a hint about its quality, is its filtering stage. The recommended components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor), and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components, usually removing the MOV and the first coil.
The transient filtering stage of the TiVECO TVPS450 has only one ferrite coil and two Y capacitors. Keep in mind that this stage not only prevents electrical noise and spikes from entering the power supply, but also prevents electromagnetic noise generated by the power supply from entering the power grid and interfering with other electronic equipment you might have in your home.
Figure 9: Transient filtering stage
On the next page, we will have a more detailed discussion about the components used in the TiVECO TVPS450.