Abstract: A method includes operating at least two inverters connected to a direct current network. Each inverter includes a control unit connected to a common communication bus and in each case at least one switching element, which is controlled by the control unit of the inverter with a clock signal. The common communication bus is connected to at least one further control unit, which in each case sends a message of a message type via the communication bus at different points of times. The reception of one of the messages of the message type in the control units of the inverters triggers a synchronization of their clock signals.

Abstract: A system is provided comprising an onboard network of a vehicle and an auxiliary converter, wherein the onboard network includes a first power supply, a second power supply, and a plurality of electric devices, wherein a second-voltage level of the second power supply is higher than a first-voltage level of the first power supply, wherein each of the electric devices includes at least one component, and wherein the at least one component of each of the electric devices is connected to the first power supply and is connected across the auxiliary converter to the second power supply.

Abstract: The disclosure relates to a drive device for a motor vehicle, with a primary power network and a secondary power network, wherein a fuel-cell device is provided in the primary power network, and a battery is provided in the secondary power network, and a drive unit of the drive device is electrically connected to the secondary power network, and wherein the battery provides, within an operating voltage range delimited downwards by a minimum voltage and upwards by a maximum voltage, electric current for proper operation of at least one electrical consumer over an operating current range delimited downwards by a minimum amperage and delimited upwards by a maximum amperage. It is provided in this respect that an open-circuit voltage of the fuel-cell device correspond at most to the maximum voltage, and that the fuel-cell voltage provided by the fuel-cell device across the operating current range be higher than the minimum voltage.

Abstract: An electric circuit arrangement includes at least one half bridge including two power switching elements, two driver circuits, and a discharge control circuit, wherein the half bridge is in parallel with an energy accumulator and each power switching element has a switchable section with an electric resistance that is adjustable by a control voltage at a control input of the power switching element, while in a normal operation of the power switching elements, the drivers circuits generates the control voltage at the control input of each power switching element, and, while in at least one discharge operation that discharges the energy accumulator, the discharge control circuit generates a discharge voltage as the control voltage as the control input of at least one of the power switching elements, the discharge voltage placing the at least one of the power switching elements in linear operation.

Abstract: An electrical circuit arrangement is provided comprising an inverter and a filter device, wherein the filter device comprises a control device and an electrical filter circuit hooked up in parallel with a direct current side of the inverter in a direct current subnetwork, wherein at least one resonance frequency of the filter circuit is adjustable, and wherein the control device is designed to actuate the filter circuit in order to adjust the resonance frequency in dependence on at least one piece of load information describing an alternating current load in the direct current subnetwork.

Abstract: The present disclosure relates to a circuit device for demagnetizing the rotor of an externally excited synchronous machine and to a method for operating the circuit device.

Abstract: A multi-phase converter for an energy system, as is used in fuel cell vehicles, and methods for operating the multi-phase converter, are described herein.

Abstract: A supply device for the electrical supply of at least one consumer has a primary current system in which there is a fuel cell device, a secondary current system in which there is a battery which has an operating voltage range limited at the top by a maximum voltage and at the bottom by a minimum voltage and which has an operating current strength range for supplying current to the at least one consumer, and a frost-starting element, which is provided in the primary current system and is designed to bring about heating of the fuel cell device. An open-circuit voltage of the fuel cell device corresponds at most to the maximum voltage of the battery.

Abstract: A method for operating at least two pulse-width-modulated inverters connected to a direct-current supply network. The pulse-width-modulated inverters are each actuated via an actuation signal and operated in an operating point. A phase difference is generated between the actuation signals of the at least two pulse-width-modulated inverters by adapting the actuation signal of at least one of the pulse-width-modulated inverters as a function of operating point information describing the operating points of the pulse-width-modulated inverters.

Abstract: An electrical energy system includes fuel cells and a battery, as well as a DC converter arranged between the fuel cell and the high-voltage battery, wherein the DC converter is a buck-boost converter, having two series-connected semiconductor switches in one of its two current pathways, between which an inductance is connected, which joins the two current pathways of the DC converter. A related method for operating an electrical energy system for a motor vehicle is also provided.

Abstract: A power supply device for the electric power supply of at least one consumer is provided having a primary power grid in which there is present a fuel cell arrangement comprising electric contacts which includes a discharge circuit switched in parallel and connected to the electric contacts comprising a switch element activatable by means of a controller across a switch line as well as a resistance element and having a DC-DC converter which is present in the primary power grid by which the primary power grid is connected to a secondary power grid characterized in that the discharge circuit comprises a safety device or a safety function, which holds the switch element in an opened state and thereby makes the discharge circuit inactive for as long as an actuating possibility exists via the switch line, and which places the switch element in a closed state and thereby makes the discharge circuit active for lowering the voltage of the fuel cell arrangement once the actuating possibility via the switch line is deni

Abstract: An electrical energy system containing fuel-cells and a method for operating an electrical energy system for a motor vehicle are disclosed. The electrical energy system includes, for example: at least one fuel-cell; at least one HV battery; a diode arranged between the at least one fuel-cell and the at least one HV battery, which diode allows current flow only in a direction from the at least one fuel-cell to the at least one HV battery; a switching element configured to reversibly disconnect or close a circuit between the at least one fuel-cell and the at least one HV battery; a control unit configured to control the switching element; and an inductor arranged between the at least one fuel-cell and the at least one HV battery and connected in series with the switching element.

Abstract: A DC link capacitor for a vehicle driven by an electric motor, assembly with a DC link capacitor and a vehicle driven by an electric motor with such an assembly.

Abstract: A DC voltage converter arrangement includes a plurality of full switch bridges and transformers and is for a galvanically separate, at least indirect electrical coupling of a fuel cell unit to a traction network including a high-voltage battery. The plurality of full switch bridges and transformers transform a DC input voltage to an alternating voltage, transform the alternating voltage to a transformed alternating voltage, and transform the transformed alternating voltage to a DC output voltage. At least one of the full switch bridges is included in a resonance circuit including an inductance and a capacitor.

Abstract: The invention relates to a method for operating a fuel cell arrangement which has a fuel cell for providing electrical energy in an electric circuit that has a circuit which is electrically connected to the fuel cell via a DC-DC converter, and a battery. It is provided that in at least one mode of operation of the fuel cell arrangement, following a start-up of the fuel cell, the battery is electrically disconnected from the circuit, and the DC-DC converter is operated in non-switched mode in order to supply at least one electrical consumer in the circuit with electric current provided by the fuel cell. The invention further relates to a fuel cell arrangement.

Abstract: A method includes operating at least two inverters connected to a direct current network. Each inverter includes a control unit connected to a common communication bus and in each case at least one switching element, which is controlled by the control unit of the inverter with a clock signal. The common communication bus is connected to at least one further control unit, which in each case sends a message of a message type via the communication bus at different points of times. The reception of one of the messages of the message type in the control units of the inverters triggers a synchronization of their clock signals.

Abstract: A galvanically connected AC charger is provided having a monitoring and diagnostic system for the AC charging of an electric, fuel cell or hybrid vehicle.

Abstract: The invention relates to a method for operating a fuel cell arrangement which has a fuel cell for providing electrical energy in a circuit, at least one fuel cell auxiliary unit, the circuit electrically connected to the fuel cell via a DC-DC converter, and a battery. In this case, it is provided that, in order to place the fuel cell into operation, the battery be electrically connected to the circuit and the fuel cell auxiliary unit be operated with electrical energy drawn from the battery, wherein the battery is electrically disconnected from the circuit, and the DC-DC converter is operated in non-clocked mode in at least one operating mode of the fuel cell arrangement after placement into operation. The invention further relates to a fuel cell arrangement.

Abstract: A DC voltage converter arrangement includes a plurality of full switch bridges and transformers and is for a galvanically separate, at least indirect electrical coupling of a fuel cell unit to a traction network including a high-voltage battery. The plurality of full switch bridges and transformers transform a DC input voltage to an alternating voltage, transform the alternating voltage to a transformed alternating voltage, and transform the transformed alternating voltage to a DC output voltage. At least one of the full switch bridges is included in a resonance circuit including an inductance and a capacitor.

Abstract: A high-voltage system of a fuel cell vehicle and a method for operating said system are described herein.