Abstract: The present disclosure relates to a solid state power controller, comprising: a power switch for interrupting a line; a current sensor for measuring a current flow on the line; and a control unit for controlling the power switch and that is configured to prevent a time-dependent overcurrent on the line on the basis of the current measured by the current sensor, wherein the control unit comprises a counter that is adapted to increment a count when the measured current is larger than a threshold value and to decrement the count when the measured current is smaller than the threshold value; and wherein the power switch is adapted to interrupt the line when the counter reaches or exceeds a predefined count.

Abstract: The present disclosure relates to a solid state power controller, comprising: a power switch for interrupting a line; a current sensor for measuring a current flow on the line; and a control unit for controlling the power switch and that is configured to prevent a time-dependent overcurrent on the line on the basis of the current measured by the current sensor, wherein the control unit comprises a counter that is adapted to increment a count when the measured current is larger than a threshold value and to decrement the count when the measured current is smaller than the threshold value; and wherein the power switch is adapted to interrupt the line when the counter reaches or exceeds a predefined count.

Abstract: The present disclosure relates to a device for monitoring and balancing the cell voltages of at least two energy storage cells, which are electrically connected in series, of a multi-cell energy storage stack having at least one energy storage element, a voltage measuring unit, a first combinatorial circuit that is connected to each energy storage cell and the voltage measuring unit, a second combinatorial circuit that is connected to the energy storage element, the voltage measuring unit, and the first combinatorial circuit, and controls a control unit, which is connected to the voltage measuring unit and the first and second combinatorial circuit.

Abstract: The invention relates to a drive circuit for an electric motor having an aerodynamic bearing of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or DC-link voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.

Abstract: The invention relates to a drive circuit for an electric motor having an aerodynamic support of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or intermediate circuit voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.

Abstract: The present invention relates to a drive system with energy recovery for driving a machine, in particular for driving a crane, wherein the drive system includes at least one fuel cell unit, at least one capacitive energy storage unit and at least one drive motor, and wherein the fuel cell unit and the energy storage unit are connected in parallel and feed at least one drive motor. According to the invention, the capacitive energy storage unit is dimensioned such that the differential voltage occurring during operation between the fuel cell unit and the capacitive energy storage unit is minimized to such an extent that the current caused by the voltage within the parallel connection of fuel cell unit and energy storage unit does not exceed a defined safe limit value, wherein the fuel cell unit and the energy storage unit are directly coupled with each other and with the remaining drive components without DC/DC converter.

Abstract: The present invention relates to a drive system with energy recovery for driving a machine, in particular for driving a crane, wherein the drive system includes at least one fuel cell unit, at least one capacitive energy storage unit and at least one drive motor, and wherein the fuel cell unit and the energy storage unit are connected in parallel and feed at least one drive motor. According to the invention, the capacitive energy storage unit is dimensioned such that the differential voltage occurring during operation between the fuel cell unit and the capacitive energy storage unit is minimized to such an extent that the current caused by the voltage within the parallel connection of fuel cell unit and energy storage unit does not exceed a defined safe limit value, wherein the fuel cell unit and the energy storage unit are directly coupled with each other and with the remaining drive components without DC/DC converter.

Abstract: The present disclosure relates to a device for monitoring and balancing the cell voltages of at least two energy storage cells, which are electrically connected in series, of a multi-cell energy storage stack having at least one energy storage element, a voltage measuring unit, a first combinatorial circuit that is connected to each energy storage cell and the voltage measuring unit, a second combinatorial circuit that is connected to the energy storage element, the voltage measuring unit, and the first combinatorial circuit, and controls a control unit, which is connected to the voltage measuring unit and the first and second combinatorial circuit.

Abstract: The present disclosure relates to a position measuring device for a fluidic cylinder, which includes a cylinder jacket and a piston rod longitudinally movable in the cylinder jacket, wherein the position measuring device includes an evaluation unit which determines the position of the piston rod with respect to the cylinder jacket with reference to the intrinsic capacitance of the capacitor formed by cylinder jacket, piston rod and a dielectric fluid acting as a dielectric.

Abstract: The present disclosure relates to a position measuring device for a fluidic cylinder, which includes a cylinder jacket and a piston rod longitudinally movable in the cylinder jacket, wherein the position measuring device includes an evaluation unit which determines the position of the piston rod with respect to the cylinder jacket with reference to the intrinsic capacitance of the capacitor formed by cylinder jacket, piston rod and a dielectric fluid acting as a dielectric.