Abstract: A method for operating an electric drive system of a vehicle where the electric drive system has an electric three-phase motor, a battery, and an inverter via which the electric three-phase motor is couplable electrically to the battery. A neutral point of the electric three-phase motor is couplable electrically to a positive pole connection of a direct current charger connection of the electric drive system. A negative potential line of the battery is couplable electrically to a negative pole connection of the direct current charger connection of the electric drive system. The neutral point is couplable electrically via a first switch to the positive pole connection. The negative potential line is couplable electrically via a second switch to the negative pole connection. The positive pole connection is couplable electrically via a third switch to a tap of an intermediate circuit capacitor.

Abstract: A circuit arrangement of a motor vehicle includes a high-voltage battery for storing electrical energy, an electric machine for driving the motor vehicle, a converter via which high-voltage direct current voltage provided by the high-voltage battery is convertible into high-voltage alternating current voltage for operating the electric machine, and a charging connection for providing electrical energy for charging the high-voltage battery. The converter is a three-stage converter having a first switch unit which is assigned to a first phase of the electric machine. The first switch unit has two switch groups connected in series which each have two insulated-gate bipolar transistors (IGBTs) connected in series, where a connection is disposed between the IGBTs of one of the two switch groups, which connection is electrically connected directly to a line of the charging connection.

Abstract: A circuit arrangement of a motor vehicle includes a high-voltage battery for storing electrical energy, an electric machine for driving the motor vehicle, a converter via which high-voltage direct current voltage provided by the high-voltage battery is convertible into high-voltage alternating current voltage for operating the electric machine, and a charging connection for providing electrical energy for charging the high-voltage battery. The converter is a three-stage converter having a first switch unit which is assigned to a first phase of the electric machine. The first switch unit has two switch groups connected in series which each have two insulated-gate bipolar transistors (IGBTs) connected in series, where a connection is disposed between the IGBTs of one of the two switch groups, which connection is electrically connected directly to a line of the charging connection.

Abstract: The invention relates to a heating device comprising at least one tube housing in which at least one PTC heating element is arranged, and heat exchangers which are secured on the tube housing. According to the invention, it is provided that the heat exchangers are secured on the tube housing by stamping.

Abstract: The invention relates to a heating device comprising at least one tube housing in which at least one PTC heating element is arranged, and heat exchangers which are secured on the tube housing. According to the invention, it is provided that the heat exchangers are secured on the tube housing by stamping.

Abstract: The invention relates to a battery for an electric vehicle, comprising a plurality of cells (2) and a plurality of sensors (3, 4) for monitoring the state of cells (2). According to the invention, at least one communication unit (5) is provided to wirelessly transmit state information on one or more cells (2).

Abstract: The invention relates to an apparatus for heating fluids, comprising a housing in which a duct runs, through which the fluid to be heated can flow and which leads from a housing opening for fluid to enter to a housing opening for fluid to exit. According to the invention, the duct extends in several convolutions along a housing wall carrying at least one heater housing, in which at least one electric heating element is arranged.