Abstract: A solar power plant includes at least one photovoltaic module for generating power to be fed in a multi-phase grid. At least one inverter is provided for converting a direct voltage generated by the at least one photovoltaic module into an alternating mains voltage. A mains transformer is coupled to receive the alternating mains voltage from the inverter. The inverter is coupled to a primary side of the mains transformer. A direct voltage source coupled between an output of the at least one inverter and an input of the mains transformer such that a potential of the at least one photovoltaic module is displaced and that a bias voltage is set which is different from zero volts.

Abstract: An adjusting device for a vehicle seat includes a brake housing that is centered about an actuating rotational axis. The brake housing is formed in a radial direction of the actuating rotational axis and includes a housing element that is generally circular and has a outer side wall, and upper wall and an inner side wall.

Abstract: A vehicle seat includes a seat part and a backrest which is provided at the seat part so as to be rotatable, wherein the seat part and the backrest can be transferred into an easy entry position.

Abstract: A drive assistance device for a wheelchair having a drive motor, a running wheel and a sensor device which is adapted to detect a driving force manually induced into the running wheel. A control unit which is adapted to control the drive motor for driving the running wheel depending on a driving force manually induced by the user into the running wheel has a user force determination operational mode in which the maximum force of the user can be determined.

Abstract: A drive assistance device for a wheelchair includes a drive motor, a running wheel and a sensor device which is adapted to determine a driving force manually induced into the running wheel; and a control unit which is adapted to control the drive motor for driving the running wheel depending on the driving force manually induced by the user into the running wheel. The control unit of the drive assistance device includes a user force analysis operational mode which is adapted to determine data concerning physical efficiency and capacity of the user. These include a maximum force of the user as well as the maximum speed which can be reached with purely manual drive.

Abstract: The object of the invention is a high-efficiency DC/DC converter, in particular for photovoltaic plants, incorporating a transformerless DC/DC converter operated in the resonant mode of operation for converting a unipolar direct input voltage with an associated positive pole (+) and with a negative pole (?). There is imposed a resonance circuit incorporating at least one resonance inductance and at least one resonance capacitance, each resonance capacitance being connected to a respective one of the rectifier circuit arrangements in such a manner that the bipolar direct output voltage is provided, a voltage boosting circuit arrangement being connected to each resonance capacitance and to the rectifier circuit arrangement.

Abstract: A solar power plant includes at least one photovoltaic module for generating power to be fed in a multi-phase grid. At least one inverter is provided for converting a direct voltage generated by the at least one photovoltaic module into an alternating mains voltage. A mains transformer is coupled to receive the alternating mains voltage from the inverter. The inverter is coupled to a primary side of the mains transformer. A direct voltage source coupled between an output of the at least one inverter and an input of the mains transformer such that a potential of the at least one photovoltaic module is displaced and that a bias voltage is set which is different from zero volts.

Abstract: A solar power plant with a plurality of photovoltaic modules for generating a power to be fed in a multi-phase grid, several photovoltaic strings, which are allocated to different phases, being connected to a primary side of a mains transformer and at least one inverter for converting the direct voltage generated by the photovoltaic modules into an alternating mains voltage conforming to the grid being provided and said mains transformer being provided with a neutral conductor and with a grounded terminal, is intended to be improved in such a manner that the life of the photovoltaic modules, in particular in case of thin-film modules, is increased, allowing for high conversion efficiency of the inverters at low wiring costs. This is achieved in that an additional direct voltage source is inserted between the neutral conductor and ground in such a manner that the potential of the photovoltaic strings is displaced and that a bias voltage is set, which is different from zero volt.

Abstract: A transformerless inverter that serves to feed electricity from a DC current source into an AC power grid, has an inverter bridge and a DC/DC converter connected upstream of the inverter bridge. The DC/DC converter converts an input DC voltage that is present between two input lines of the inverter into a DC link voltage present between two input lines of the inverter bridge. The inverter bridge converts the DC link voltage present at the input lines thereof into an output AC voltage. The DC/DC converter includes at least one resonant circuit that has a resonance inductance and a resonance capacitance and is connected on its input side via at least two clocked switches to one of the two input lines of the inverter or an intermediate potential line carrying a potential in between. The input lines of the inverter and the input lines of the inverter bridge are galvanically isolated from one another by a capacitive method.

Abstract: An inverter (1) for a grounded direct voltage source, in particular for a photovoltaic generator (2), a battery or a fuel cell, for converting the direct voltage into an alternative voltage with a DC-DC converter (3) and a pulse inverter that is supplied by said DC-DC converter (3), said DC-DC converter (3) being configured to be an oscillating circuit inverter and comprising a series resonant oscillating circuit, said DC-DC converter (3), which is configured to be an oscillating circuit inverter, being configured to be a series-compensated oscillating circuit inverter with a choke (L1) and a series-mounted capacitor array consisting of two or several oscillating circuit capacitors, a rectifier bridge branch including 2 diodes (D3, D4; D5, D6, . . .

Abstract: A coupling device actuated by centrifugal force has a holder and at least one flyweight supported on the holder so as to be moveable in a radial direction relative to an axis of rotation about which the coupling device is rotatable. The flyweight is movable between an inner radial position and an outer radial position. At least one spring acting on the flyweight is provided that forces the flyweight into the inner radial position. At least one securing element secures at least one component of the coupling device in an axial direction of the axis of rotation. The securing element is monolithically formed on the flyweight.

Abstract: A two-stroke engine (1) includes a combustion chamber (3) which is defined by a piston (5, 44) which is mounted in the cylinder (2) to reciprocate. The piston (5, 44) has a first control surface (62) which controls an outlet (9) out of the combustion chamber (3) and two second control surfaces (63) for the transfer windows (11, 13) of at least one transfer channel (10, 12). At least two transfer windows (11, 13) are arranged on opposite sides of the cylinder bore (60). At least a first recess is provided on the piston skirt (36) which extends in the peripheral area between the two second control surfaces (63) and which is separated from the transfer window (11, 13) via a section of the piston skirt (36) in every position of the piston (5, 44).

Abstract: A vehicle seat includes a seat part having a seat substructure. The seat part is displaceable along a transverse axis with respect to the seat substructure and the seat part is at least partially swivelably about the transverse axis. The seat includes a displacement element having a displacement length, a fixed lower part and an upper part. A first longitudinal movement of the seat part and a first transverse movement of the seat part occurs along a first section of the adjustment length. A second longitudinal movement of the seat part and a second transverse movement of the seat part occurs along a second section of the adjustment length. The ratio of the first longitudinal movement to the first transverse movement differs from the ratio of the second longitudinal movement to the second transverse movement.

Abstract: A vehicle seat includes a backrest and a seat part, at least one of which has a structural element with a cavity. At least one part of the cavity receives an insert in the region of a filling. The insert is connected to the structural element in a positively locking fashion at least with regard to one type of movement. The insert is bonded to the filling.

Abstract: A vehicle seat includes a backrest and a seat part, at least one of which has a structural element forming a cavity. A filling is disposed in the cavity and configured to influence the stability and/or the deformation behavior of the backrest and/or the seat part. The filling comprises a foam support and a foam material that at least partially surrounds the foam support.

Abstract: A vehicle seat includes a backrest and a seat part, at least one of which has a structural element with a cavity. The cavity is formed by a base plate and at least two profiles secured to the base plate. A corner region of the two profiles has provided in it a filling configured to influence the stability and/or the deformation behavior of the backrest and/or the seat part. The filling has a foam support and a foam material at least partially surrounding the foam support.

Abstract: The invention is directed to an apparatus (1) for accommodating a plurality of individual inverters (2), comprising a rack, the individual inverters (2) being removably mountable to the side elements of said rack, said rack having at least one terminal block (10) for receiving cables for current supply and evacuation.

Abstract: A vehicle seat includes a seat part and a partitioned back rest. The back rest has a first segment and a second segment. The segments are each equipped with an inclination adjuster. The adjusters include means for limiting the inclination of one segment relative to the other.

Abstract: An adjusting device for a vehicle seat includes a brake housing that is centered about an actuating rotational axis. the brake housing is formed in a radial direction of the actuating rotational axis and inlcudes a housing element that is generally circular and has a outer side wall, and upper wall and an inner side wall.