Voltage filter
Hacheurs : filtres, commutations et commande

Let's take a look at the step-down chopper we studied in [E 3 964, § 1] . It has a voltage filter at the input (figure 6 ). The following analysis remains valid for all other converters that require an output voltage filter. By adapting the following reasoning, it is even possible to extend the results to a voltage output filter (step-up chopper).

The filter we are studying is a second-order low-pass filter. There is therefore a risk of resonance, if the critical frequency f _c is close to the switching frequency f...