Method for operating an energy supply unit for a motor vehicle electrical system

摘要

A method for operating an energy supply unit for a motor vehicle electrical system, including at least one first subsystem and one second subsystem having different voltage levels, the energy supply unit including an electric machine which is connected via a converter circuit to the first subsystem and the second subsystem. In a first operating mode, a switchable switch element of the converter circuit which connects the converter circuit to the second subsystem is opened, the converter circuit is activated as an inverter circuit and the electric machine is motor or generator operated. In a second operating mode, the switchable switch element of the converter circuit is closed, the converter circuit is activated as a DC-DC converter and the DC-DC conversion takes place between the voltage levels of the first and the second subsystem.

主权项

1. A method for operating an energy supply unit for a motor vehicle electrical system including at least one first subsystem and one second subsystem having different voltage levels, the method comprising:
in a first operating mode:
opening a switchable switch element of a converter circuit which connects the converter circuit to the second subsystem, wherein the energy supply unit includes an electric machine which is connected via the converter circuit to the first subsystem and to the second subsystem; andoperating the converter circuit as an inverter circuit;wherein the electric machine is operated by a motor or a generator; and in a second operating mode:
closing the switchable element of the converter circuit; andoperating the converter circuit as a DC-DC converter;wherein the DC-DC conversion occurs between the voltage levels of the first subsystem and the second subsystem.