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A method for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit having an electric generator having a stator having a stator winding and a rotor having a rotor winding, as well as a field current controller assigned to the rotor winding for selecting the

A method for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit having an electric generator having a stator having a stator winding and a rotor having a rotor winding, as well as a field current controller assigned to the rotor winding for selecting the setpoint of the current flowing through the rotor winding; the electric generator being set into rotation without a current being specified by the rotor winding, thereby generating a starting voltage; at least one component of the power supply unit or of the vehicle electrical system being energized by the starting voltage.

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1. A method for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit including an electric generator, the method comprising: generating a starting voltage by setting the electric generator into rotation without a current being specified by a rotor winding,

1. A method for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit including an electric generator, the method comprising: generating a starting voltage by setting the electric generator into rotation without a current being specified by a rotor winding, the electric generator having a stator having a stator winding and a rotor having the rotor winding;selecting, via a field current controller assigned to the rotor winding, a setpoint of a current flowing through the rotor winding;energizing, by the starting voltage, at least one component of the power supply unit or of the vehicle electrical system; andconnecting the power supply unit, which is initially disconnected from the vehicle electrical system, to the vehicle electrical system when the starting voltage exceeds a lower threshold value. 2. The method of claim 1, wherein the level of the starting voltage is adjusted by at least one of setting a speed of the electrical machine, appropriately controlling the rectifier, and appropriately controlling the field current controller. 3. The method of claim 1, wherein as a component of the power supply unit or of the vehicle electrical system, at least one of the field current controller, the rotor winding, a rectifier, a power consumer, and at least one DC link capacitor is supplied with starting voltage. 4. The method of claim 1, wherein the method is implemented upon initial start-up of the power supply unit. 5. A computer readable medium having a computer program, which is executable by a processor, comprising: a program code arrangement having program code for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit including an electric generator, by performing the following: generating a starting voltage by setting the electric generator into rotation without a current being specified by a rotor winding, the electric generator having a stator having a stator winding and a rotor having the rotor winding;selecting, via a field current controller assigned to the rotor winding, a setpoint of a current flowing through the rotor winding;energizing, by the starting voltage, at least one component of the power supply unit or of the vehicle electrical system; andconnecting the power supply unit, which is initially disconnected from the vehicle electrical system, to the vehicle electrical system when the starting voltage exceeds a lower threshold value. 6. A processing unit, comprising: a processing arrangement configured for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit including an electric generator, by performing the following: generating a starting voltage by setting the electric generator into rotation without a current being specified by a rotor winding, the electric generator having a stator having a stator winding and a rotor having the rotor winding;selecting, via a field current controller assigned to the rotor winding, a setpoint of a current flowing through the rotor winding;energizing, by the starting voltage, at least one component of the power supply unit or of the vehicle electrical system; andconnecting the power supply unit, which is initially disconnected from the vehicle electrical system, to the vehicle electrical system when the starting voltage exceeds a lower threshold value. 7. A power supply unit for an electrical system of a motor vehicle, comprising: an electric generator including a stator having a stator winding and a rotor having a rotor winding;a field current controller assigned to the rotor winding for selecting a setpoint of the current flowing through the rotor winding; anda processing unit configured for operating a power supply unit for an electrical system of a motor vehicle, the power supply unit including an electric generator, by performing the following: generating a starting voltage by setting the electric generator into rotation without a current being specified by the rotor winding;selecting, via the field current controller assigned to the rotor winding, the setpoint of the current flowing through the rotor winding;energizing, by the starting voltage, at least one component of the power supply unit or of the vehicle electrical system; andconnecting the power supply unit, which is initially disconnected from the vehicle electrical system, to the vehicle electrical system when the starting voltage exceeds a lower threshold value. 8. The power supply unit of claim 7, further comprising: a rectifier having rectifier elements for rectifying phase voltages generated by the electric generator. 9. The power supply unit of claim 7, wherein the rotor includes at least one permanent magnet. 10. The power supply unit of claim 7, further comprising: a switching element to disconnect the power supply unit from the remainder of the vehicle electrical system. 11. The power supply unit of claim 7, wherein the level of the starting voltage is adjusted by at least one of setting a speed of the electrical machine, appropriately controlling the rectifier, and appropriately controlling the field current controller.