Patent ID: 8646427

Claim:
An electrical power supply system for a vehicle having internal combustion engine equipped with an automatic start and restart device of the combustion engine; said power supply system comprising an onboard electrical network to which electricity consuming devices are connected, means for starting/restarting the engine, a battery electrically connected to the onboard electrical network and the start/restart means, and a voltage maintaining device for maintaining the voltage during an engine restart; the voltage maintaining device including an input and an output; the onboard electrical network being connected to the output of the voltage maintaining device and the battery being connected to the input of the voltage maintaining device; the voltage maintaining device being connected to a positive pole of the battery; the start/restart means being connected to the battery upstream of the voltage maintaining device; wherein the current supplied to the onboard electrical network passes through the voltage maintaining device and the current supplied to the start/restart means does not pass through the voltage maintaining device.