Power converter

Method of controlling a DC-DC converter comprising:

• a first node and a second node intended to receive a DC voltage to be converted;
• a third node intended to deliver a DC voltage referenced to the second node;
• at least one first solid electrolyte capacitor having an ionic-type operation below a cutoff frequency and an electrostatic-type operation for higher frequencies;
• at least one first switching cell formed of four switches respectively coupling a first electrode of the first capacitor to the first node and to the third node and a second electrode of the first capacitor to the second node and to the third node;
• the switching frequency of the switches being adapted to the power required at the output and to selecting an operating mode of the first capacitor from among the electrostatic operating mode and the ionic operating mode.