On-board vehicle electrical system for charging an electrically operated vehicle, and method

A vehicle electrical system comprising:

• an inverter,
• an electrical energy store,
• an electrical machine and
• an AC transmission terminal,
• wherein the inverter has a first side and a second side and is configured to transmit power between these sides,
• wherein two output terminals of the inverter are connected or connectable to the energy store on the first side of the inverter,
• wherein at least two phase current terminals of the inverter are connected or connectable to the electrical machine on the second side of the inverter,
• wherein at least one of the charging inputs of the vehicle electrical system is connectable to a respective inner motor phase of the electrical machine by a switching device controlled by a controller,
• and wherein the vehicle electrical system is designed to initially charge the electrical energy store with a first voltage to at least one voltage sufficient for charging with a second voltage,
• and then to charge the electrical energy store with the second voltage, which second voltage is equal to or greater than the first voltage.