Method for conducting a pre-charging process of an onboard electrical system of a vehicle, and onboard electrical system for a vehicle

A method for performing a pre-charging process of an onboard electrical system of a vehicle and for a charging process of a vehicle battery of the vehicle immediately following the pre-charging process,

• wherein the vehicle battery is galvanically connected to a first onboard electrical sub-system of the onboard electrical system by a first switch element and a changeover switch, the changeover switch being physically separated from the first switch element and galvanically separated from a charging path of the onboard electrical system by a second switch element that is physically separated from the first switch element and from the changeover switch, and wherein the first onboard electrical sub-system is galvanically separated from the charging path by the changeover switch,
• wherein at least one line capacitance of the charging path of the onboard electrical system is pre-charged to a first voltage value by a power source electrically connected to the charging path,
• wherein at least one capacitor of the first onboard electrical sub-system is pre-charged to a second voltage value by the vehicle battery,
• wherein depending on a respective state of charge of the at least one line capacitance of the charging path and of the at least one capacitor of the first onboard electrical sub-system, the vehicle battery of the vehicle is charged by the power source,
• wherein for pre-charging the at least one capacitor of the first onboard electrical sub-system, a switch element of a semiconductor fuse, which is interconnected to at least one potential line between the first onboard electrical sub-system and the changeover switch, is opened, and
• wherein for supplying the first onboard electrical sub-system with a charging voltage, the switch element of the semiconductor fuse is closed.