System for controlling supply voltage of on-board electrical network of motor vehicle

A system (17) for controlling a supply voltage (B+A) of an on-board electrical network of a motor vehicle, said system (17) comprising:

• a digital regulation device (2, 4, 9, 16) for regulation of said supply voltage (B+A);
• and
• a protection device (11) for protecting against excess voltages of said on-board electrical network;
• said digital regulation device (2, 4, 9, 16) and said protection device (11) control jointly excitation of an alternator which supplies said on-board electrical network;
• said protection device (11) is distinct from said regulation device (2, 4, 9, 16);
• an excess voltage signal (OVD) generated by said protection device (11) and controlling said excitation takes priority over an excitation signal (EXC) which is generated by said regulation device (2, 4, 9, 16);
• said protection device (11) comprising
• a first acquisition system (12) for acquisition of said supply voltage (B+A) and/or a battery voltage (B+) at the terminals of a battery which is connected to said on-board electrical network;
• a comparison system (13) for comparison of said supply voltage (B+A) and/or of said battery voltage (B+), respectively with a first reference voltage (Vref1) and/or a second reference voltage (Vref2);
• an integration system (14) for integration of an output signal (S1) of said comparison system (13);
• an interface system (15) which generate said excess voltage signal (OVD) from an integrated output signal (S2);
• said integration system (14) comprising an offset register (25) controlled by a first clock (26).

A system (17) for controlling a supply voltage (B+A) of an on-board electrical network of a motor vehicle, said system (17) comprising:

• a regulation device (2, 4, 9, 16) of a digital type for regulation of said supply voltage (B+A);
• and
• a protection device (11) for protection against excess voltages of said on-board electrical network;
• said digital regulation device (2, 4, 9, 16) and said protection device (11) control jointly excitation of an alternator which supplies said on-board electrical network;
• said protection device (11) is distinct from said regulation device (2, 4, 9, 16);
• an excess voltage signal (OVD) generated by said protection device (11) and controlling said excitation takes priority over an excitation signal (EXC) which is generated by said regulation device (2, 4, 9, 16);
• said protection device (11) comprising
• a first acquisition system (12) for acquisition of said supply voltage (B+A) and/or a battery voltage (B+) at the terminals of a battery which is connected to said on-board electrical network;
• a comparison system (13) for comparison of said supply voltage (B+A) and/or of said battery voltage (B+), respectively with a first reference voltage (Vref1) and/or a second reference voltage (Vref2), said comparison system (13) having a hysteresis;
• an integration system (14) for integration of an output signal (S1) of said comparison system (13);
• an interface system (15) which generate said excess voltage signal (OVD) from an integrated output signal (S2);
• said integration system (14) comprising an offset register (25) controlled by a first clock (26).