On-board electrical system for a motor vehicle and method for operating an electrical load

Abstract

Disclosed is a method allowing the advantageous operation of an on-board electrical system (10) of a motor vehicle without high energy expenditure. Provided is an on-board electrical system (10) comprising a vehicle battery (16), an electrical load (30, 48) and a double-layer capacitor (32) with a positive and a negative terminal (34, 36). Switching means (22) are provided that couple the positive terminal (34) with the vehicle battery (16) and the negative terminal (36) with the electrical load (30, 48) in a first switching state, and that have at least one additional switching state. In the first switching state, an overvoltage can be compensated since the double-layer capacitor (32) is connected in series with opposite polarity to the vehicle battery (16). Preferably, the polarity of the double-layer capacitor (32) can be reversed, and the latter can be bridged. The switching means (22) can also assume a switching state in which the electrical load (30, 48) is decoupled from the vehicle battery (16).

Dependencies are inferred from the claim text.