US Patent 10029572 Power source system for a vehicle

A hybrid power source connects a secondary battery and an EDLC. A first switch connects the hybrid power source and a lead acid battery in parallel. A power source controlling portion controls power supply to the hybrid power source and the lead acid battery. The hybrid power source is connected to a starter for starting an engine for a vehicle, and also connected to an electric device except for the starter through the first switch, and the lead acid battery is connected to the electric device, and also connected to the starter through the first switch.