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A multi-voltage electrical system for a vehicle is described, which includes a generator and a voltage regulator; the voltage regulator regulates the output voltage of the generator to predeterminable values by varying the exciter current. Connected downstream of the generator are two rectifier arra

A multi-voltage electrical system for a vehicle is described, which includes a generator and a voltage regulator; the voltage regulator regulates the output voltage of the generator to predeterminable values by varying the exciter current. Connected downstream of the generator are two rectifier arrangements, which lead to a terminal (B1) and a terminal (B2), respectively. At least the rectifier arrangement leading to the terminal having the lower voltage is designed as a controllable rectifier and is triggered by the voltage regulator in such a way that the desired voltage (UB1+) occurs. The other rectifier arrangement leads to the terminal (B2+), at which a higher voltage occurs, by suitable regulation of the exciter current. The controllable rectifier arrangement preferably includes six MOS field effect transistors.

대표청구항 ▼

1. A multi-voltage electrical system for a vehicle, having a generator and a voltage regulator that regulates the output voltage of the generator to predeterminable values by varying the current flowing through the exciter winding, having at least two rectifier arrangements downstream of the generat

1. A multi-voltage electrical system for a vehicle, having a generator and a voltage regulator that regulates the output voltage of the generator to predeterminable values by varying the current flowing through the exciter winding, having at least two rectifier arrangements downstream of the generator, in which the first rectifier arrangement leads to a first terminal (B1+), at which a first direct voltage (UB1+) occurs, and the second rectifier arrangement leads to a second terminal (B2+), at which a second, higher direct voltage (UB2+) is located, the first direct voltage (UB1+) and the second direct voltage (UB2+) being regulatable independently from a rotary speed, and said first rectifier arrangement is constructed as a controllable rectifier with at least six controllable rectifier elements, and two at a time of these are in series with one another and are each connected between one phase winding and the terminal (B1+), and that the voltage regulator (13) triggers the regulating transistor (12) in such a way that an exciter current (IE) flows, which causes a higher voltage (of 36 or 42 V) to occur at the terminal (B2+), and that the regulator (13) simultaneously triggers the controllable rectifiers (14) in such a way that a lower voltage (of 12 V or 14 V) occurs at the terminal (B1+) the first direct voltage (UB1+) and the second direct voltage (UB2+) being regulatable independently from a rotary speed.