Device and method for stabilizing a voltage applied to a first electrical load arranged in a vehicle electrical system of a vehicle

摘要

The invention relates to a device and a method for stabilizing a voltage (U2, U2 ') applied to a first electrical consumer (42, 42') arranged in a vehicle electrical system (38, 38). The vehicle electrical system (38, 38 ') has first and second electrical consumers (42, 42', 44, 44 '). The device further comprises: a first voltage supply unit (40, 40 ') which provides a supply voltage (U2, U2'), a storage unit (34, 34 ') for storing electrical energy; a second voltage supply unit (36, 76) for providing a charging voltage (U1, U1 '); a switching unit (46, 46 ') to which the first electrical consumer (42, 42'), the storage unit (34, 34 '), the first voltage supply unit (40, 40') and the second voltage supply unit (36, 76) are connected are; a control unit (30, 30 ') with which it can be determined whether the voltage is to be stabilized. As long as the voltage (U2, U2 ') is not to be stabilized, the control unit (30, 30') controls the switching unit (46, 46 ') in such a way that the first electrical consumer (42, 42') connects to the first voltage supply unit ( 40, 40 '), and as soon as stabilization is to be carried out, so that the first electrical consumer (42, 42') is formed from one of the storage unit (34, 34 ') and the first voltage supply unit (40, 40') Series connection is connected. Following stabilization, the second voltage supply unit (36, 76), the second electrical consumer (44, 44 ') and the switching unit (46, 46') are controlled in such a way that the second voltage supply unit (36, 76) has a charging voltage (U1, U1 '), which is greater in value than the supply voltage (U2, U2') that an electrical current flows through the second electrical consumer (44, 44 ') from the second voltage supply unit (36, 76), and thus a Loading the storage unit (34, 34 ') is possible.