Abstract: Power supply arrangement with first transformer (T1), having transformer core (K) with legs (K1) and yokes (K2) connecting these legs. Legs (K1) and yokes (K2) are arranged in geometric shape of a cylinder. The cylinder has first polygon as base surface and second polygon as surface opposite. The yokes (K2) are arranged along edges of first polygon and along edges of second polygon. Legs (K1) are arranged along edges of an outer surface of the cylinder. Primary windings and secondary windings (T1.1, T1.2, T1.3) arranged on legs (K1) of the transformer core. Secondary windings (T1.1, T1.2, T1.3) have three terminals (A), including a neutral conductor terminal and two phase conductor terminals. Phase conductor terminals of the secondary windings (T1.1, T1.2, T1.3) are mechanically and electrically connected to a first electrically conductive support (L), having an outer end, the outer end of the first carrier (L) are located outside the cylinder.

Abstract: A manually operated hammer drill (1) includes a spindle (3) that drives a chuck (5) in a rotary manner about an axis of rotation (6) in a drilling mode, and includes a pneumatic hammer mechanism (4), that hammers against a tool inserted in the chuck (5) in a hammer mode. The hammer mechanism (4) has a piston (10) which performs reciprocating movements (12) parallel to the axis of rotation (6) in a cylinder (11) conformed inside the spindle (3) when hammer mode is activated. The piston (10) has at least one radial groove (21) in which an annular seal (22) is arranged.

Abstract: A photovoltaic power plant with photovoltaic modules (1) for generating electric power. The modules (1) are connected together into a plurality of strands (2). A first central converter (5) for converting electrical energy generated by the photovoltaic modules into electrical energy with a voltage having a voltage waveform that corresponds to a voltage waveform of a voltage in a utility grid, and with an output for feeding the converted current into the utility grid, wherein the first central converter (5) has at least one electric motor (51) and a synchronous generator (52) whose shafts are coupled to one another.

Abstract: A hand-operated power tool, particularly a hammer drill (1), includes a drive motor (2), a tool spindle (3) to drive a tool in rotary manner, a rotary drive transmission (4) to couple the drive motor (2) to the tool spindle (3), a hammer mechanism (5) to drive the tool in percussive manner, a hammer mechanism transmission (6) to couple the drive motor (2) to the hammer mechanism (5), and a switching device (7) to activate and deactivate the hammer mechanism (5). The switching device (7) has a clutch (9) that is integrated in a force path (10) of the hammer mechanism transmission (6) and has an actuation stroke (11) for advancing and withdrawing the clutch (6), which stroke extends perpendicularly to the axis of rotation (8) of the tool spindle (3), or parallel to an axis of rotation (37) of an actuating element (28) that is rotated manually to actuate the switching device (7) for advancing and withdrawing the clutch (6).

Abstract: A power supply arrangement (MF) with an inverter (12) for generating N-phase AC current and at least one N-phase AC current transformer (2) having primary windings (211, 212, 213) and secondary windings (221, 222, 223), wherein the primary windings (211, 212, 213) are connected in a polygon and a sum vector of the voltages present at the N secondary windings (221, 222, 223) becomes zero when the transformer is idling, wherein each vertex of the polygon formed by the primary windings (211, 212, 213) is connected via a corresponding capacitor (C11, C12, C13) with a corresponding phase conductor terminal of the inverter (12).

Abstract: Power supply arrangement with inverter (3) generating single-phase AC current and transformer (4) having primary winding (41) and first secondary winding (421) and second secondary winding (422). The secondary windings (421, 422) have same number of turns and are arranged to be permeated by same magnetic flux during operation of transformer (4), so that identical voltages are tapped at secondary windings (421, 422) during operation of the transformer (4). A respective terminal of first secondary winding (421) and a respective terminal of second secondary winding (422) are connected to one another at first point (K1), that two-phase system whose phases are shifted by 180° relative to each other is produced between first point (K1), additional terminal of first secondary winding (421) and additional terminal of second secondary winding 422). First point (K1) is connected to neutral conductor terminal (N) of output of power supply arrangement via capacitor.

Abstract: A current supply arrangement with p first current supply devices and a second current supply device, n first transformers having a secondary winding with several taps. The secondary windings of each first transformer in each first current supply device are connected with one another via a power controller at a first node. The first node together with a tap for a reference potential of the at least one secondary winding of the first transformer, to which the first current supply device is connected, forms a first output, to which a series connection of loads, in particular polysilicon rods in a reactor for producing polysilicon according to the Siemens process, are connected, wherein the second current supply device has at an input with n terminals and q converter groups for converting n-phase AC current into m-phase AC current and the input is connected with the q converter groups.

Abstract: On a printed circuit or substrate board (10) designed to receive electronic components and having conductive tracks (12) printed on said board, one or more conductive bars (18) are provided that are mounted one after another between conductive link surfaces (140, 142, 144), the conductive bars (18) being electrically interconnected during a subsequent soldering process that is either a wave soldering process or a soldering process in a reflow oven.

Abstract: A matrix connection device disposed between n unidirectional energy sources (PV1, PV2, PVn) and n power converters (C1, C2, Cn) for the purpose of powering a common load (10), said device comprising: n matrix switch units (I1, I2 to In), each of which comprises n link switches (Ki1, Ki2 to Kin) having their outlets connected together and having their n inlets connected to the n outlets of said photovoltaic panels and/or wind turbines; at least one additional switch unit (In+1) comprising n switches (Kn+11, Kn+12 to Kn+1n) having their outlets connected together and their n inlets connected to respective ones of the n outlets of the unidirectional energy sources; and a monitoring and control circuit (14) for starting up or not starting up said power converters as a function of the power available at each of said unidirectional energy sources, and then for keeping them switched on or for deactivating them as a function of the power consumed by each of them.

Abstract: The invention relates to a portable power tool having a motor housing (1) and a separate handle housing (3) fastened to the motor housing (1) by means of an elastic vibration damper (2) and secured thereon in a positive-locking manner. The vibration damper (2) is composed of a fastening sleeve (4) assigned to the motor housing (1), an elastic damping sleeve (5) coaxially enclosing the fastening sleeve (4) and a handle holder (6) likewise coaxially enclosing the fastening sleeve (4) and the damping sleeve (5) and assigned to the handle housing (3). The essentially rigid construction unit consisting of the handle holder (6) and the handle housing (3) is secured in a positive-locking manner, with play, directly to the essentially rigid construction unit consisting of the fastening sleeve (4) and the motor housing (1).

Abstract: The invention relates to an arrangement (10) for ground fault monitoring of an AC circuit between, on one hand, a neutral conductor (N?) of the AC circuit and, on the other hand, a protective ground wire (PE) or a ground wire with a series connection of ohmic resistors (R1, R2, R3), which has a first terminal (101) for the neutral conductor (N?) and a second terminal (102) for the protective ground wire (PE) or ground wire, wherein the arrangement includes at least one means for detecting a break of one of the resistors (R1, R2, R3) of the series connection.

Abstract: An electrical tool (1) includes an electric motor (3), a fan wheel (4) that is connected in torque-proof manner to a drive shaft (8) of the electric motor (3) disposed within a housing (2) that includes at least one air inlet aperture (6) and at least one air outlet aperture (7). The at least one air outlet aperture (7) is arranged axially apart from the fan wheel (4) with regard to the axis of rotation (10) of the drive shaft (8). An air guide baffle ring (11) encloses the fan wheel (4) coaxially and has at least one air duct (12) which leads to at least one air outlet aperture (7) located axially at a distance from the fan wheel (4) for cooling the electric tool (1).

Abstract: The invention relates to an arrangement for an uninterruptible power supply with a rectifier, an energy store, an inverter, a switching means and a controller. The rectifier is connected to a rectifier input to a supply grid (AC1). The energy store is connected to a rectifier output of the rectifier (1) and to an inverter input of the inverter. A network (AC3) to be protected or a load to be protected is connected to an inverter output of the inverter, wherein the rectifier input or a supply grid (AC2) is connected via the switching means to the inverter output, and wherein the rectifier, the inverter and the switching means is controlled by the controller, wherein the controller has two control parts which are constructed with redundancy, and wherein the rectifier and the switching means or the inverter and the switching means can be controlled simultaneously by the control parts.

Abstract: An arrangement for uninterruptible power supply with a rectifier, an energy store, an inverter with an input, a switch and a controller. The rectifier is connected to a rectifier input to a supply grid (AC 1), the energy store is connected to a rectifier output and to an inverter input. A network (AC 3) to be protected is connected to an inverter output of the inverter. The rectifier input or a supply grid (AC2) is connected via the switch to the inverter output, wherein the rectifier , the inverter and the switch are controlled by the controller , wherein the arrangement includes sensors for measuring voltages and/or currents. Each sensor is connected via a sensor output to exactly one controller and each sensor is configured to convert a parameter to be measured into a low-voltage signal.

Abstract: A current supply arrangement for, e.g., producing polysilicon, with a first current supply device and a second power supply device, including two AC current regulators and a voltage sequence controller for controlling the AC current regulators, with a terminal group having two terminals for connecting a load. A terminals is connected directly, i.e., without an interconnected switch, with an output terminal of the second current supply device, and with a first switching group associated with the terminal group, with switches for connecting and disconnecting the terminals of the terminal group with or from output terminals of the first current supply device. The current supply arrangement also includes an additional current supply device having two AC current regulators and a voltage sequence controller for controlling the AC current regulators, additional terminal groups comprising two terminals for connecting one load.

Abstract: The invention relates to a power electronic assembly (1, 2, 3) with a heat sink (2), a power semiconductor module (1) and a circuit arrangement (3) for controlling the power semiconductor module, wherein the heat sink (2) has at least two parallel channels through which a coolant can flow.

Abstract: A circuit (S) for protecting a DC network having DC loads (1) and connectable to the circuit (S), the circuit (S) is suitable and configured to supply the DC network with electric power via a three-phase rectifier (G) and wherein the circuit (S) includes a means (2, 3, 4, TH1, LS, CS, DU, DV, DW) for detecting an overvoltage, wherein the means is suitable and configured to detect an overvoltage at the input of the DC network, and the circuit (S) includes a means (2, 3, 4, TH1, LS, CS, DU, DV, DW) for transferring a current, wherein the means is suitable and configured to supply current to one or several current-carrying thyristors (THU1, THV1, THW1) of the rectifier (G), wherein the current causes the thyristor or thyristors (THU1, THV1, THW1) to turn off as soon as the detection means has detected an overvoltage.

Abstract: The invention relates to a power supply arrangement with a first transformer (T1), with at least two secondary-side taps for a secondary-side phase conductor potential and with a tap for a secondary-side neutral conductor potential, wherein in standard operation of the first transformer a rated voltage drops between a first of the taps for the secondary-side phase conductor potential and the tap for the secondary-side neutral conductor potential, and with two power controllers (V1, V2) connecting the taps for the secondary-side phase conductor potential with a phase conductor terminal of an output of the power supply arrangement, wherein the circuit arrangement has on the secondary side of the first transformer (T1) a means (T2) for increasing the voltage above the rated voltage.

Abstract: The invention relates to a power supply arrangement (MF) for a reactor (R) for producing polysilicon, with a frequency converter, with at least one input for receiving an input current from the supply grid with which the input is connected, and outputs for connecting one or several loads (3), via which the load(s) (3) can be supplied with an output current, wherein the power supply arrangement has a transformerless conversion circuit for converting the input current into an n-phase multiphase AC current, wherein the phase shift between chained voltages of an n-phase AC current system formed on the secondary side of the conversion circuit is 360°/n, wherein n is a natural number greater than or equal to two, wherein the supply arrangement (MF) has n outputs, wherein the outputs form a chain, and wherein one of the chained voltages of the n-phase AC current system is applied at each output.

Abstract: A cooling unit for a power tool comprises a fan wheel (10) to be supported on an armature shaft (3) of a motor (1) of the power tool. The cooling unit comprises a torque transfer means as well as an actuating means (20, 22) for actuating this torque transfer means so as to selectively transfer the rotation of the armature shaft (3) to the fan wheel (10) during operation of the power tool.