An electronic control device for controlling a converter that comprises a piezoelectric element and a plurality of switches which are commanded to alternate phases, respectively at substantially constant voltage, and substantially constant charge, across the terminals of said piezoelectric element, the control device comprising:



a measurement module for measuring a period of a resonance cycle of the piezoelectric element;
an event detection module for detecting a characteristic event belonging to a current resonance cycle;
a command module for commanding the switching of the switches;
a computation module for computing at least three subsequent switching time instants during at least one subsequent resonance cycle, which is posterior to the current resonance cycle, each subsequent switching time instant being computed based on a respective characteristic event; and
the command module being configured to command the switching of the respective switch at each of the subsequent time instants computed.