Electric system of an electric road vehicle

An electric system (16) of a road vehicle (1) and comprising:

• a high-voltage electrical circuit (17) provided with a first storage system (14) and with at least one electric machine (8) designed to generate electrical energy;
• a low-voltage electrical circuit (18) provided with at least one continuous electrical load, which must be powered even when the vehicle (1) is in a parking condition, and at least one occasional electrical load, which must not be powered when the vehicle (1) is in a parking condition;
• a main electronic DC-DC power converter (27) which connects the low-voltage electrical circuit (18) and the high-voltage electrical circuit (17) to one another to transfer electrical energy from the high-voltage electrical circuit (17) to the low-voltage electrical circuit (18) so as to power all electrical loads;
• a secondary electronic DC-DC power converter (28) which connects the low-voltage electrical circuit (18) and the high-voltage electrical circuit (17) to one another to transfer electrical energy from the high-voltage electrical circuit (17) to the low-voltage electrical circuit (18);
• and
• a control unit (34);
• wherein the secondary electronic DC-DC power converter (28) is completely separate from and independent of the main electronic DC-DC power converter (27) and is configured to operate only and exclusively the continuous electrical load and only when the vehicle (1) is in the parking condition;
• wherein a nominal power of the secondary electronic DC-DC power converter (28) is sized so as to allow the secondary electronic DC-DC power converter (28) to operate, i.e. to keep switched on, only and exclusively the continuous electrical load and only when it operates in the parking condition;
• and
• wherein the control unit (34) is configured to:
• operate all electrical loads using in a continuous manner, i.e. without conversion interruptions, only the main electronic DC-DC power converter (27) when the vehicle (1) is in a driving condition, and operate the sole continuous electrical load using in a continuous manner, i.e. without conversion interruptions, only the secondary electronic DC-DC power converter (28) without operating the occasional electrical load when the vehicle (1) is in the parking condition.