Abstract:
The invention concerns a method for controlling an assembly of transformers magnetically independent of one another to obtain a desired global transformation of said assembly comprising the following steps: controlling (in 84) certain switches of said assembly to produce a succession of several global transformation ratios, and adjusting (in 84) the conduction time of each of the controlled switches based on the desired global transformation ratio such that the value of the temporal average of the succession of global transformation ratios tends towards the value of the desired global transformation ratio.
Abstract:
Es wird eine Schaltungsanordnung zur Erzeugung einer Röntgenröhrenspannung (U t ) mit einer Netzeingangsschaltung (1) zur Erzeugung einer Zwischenkreisspannung (U dc ), einer Wechselrichterschaltung (2) zur Umwandlung der Zwischenkreisspannung (U dc ) in eine hochfrequente Wechselspannung sowie einem Hochspannungserzeuger (6) beschrieben, welcher die hochfrequente Wechselspannung mit einem bestimmten Übersetzungsverhältnis in eine Hochspannung (U t ) für die Röntgenröhre (5) umwandelt. Der Hochspannungserzeuger (6) ist dabei derart ausgebildet, dass er zwischen zumindest zwei Betriebszuständen mit verschiedenen Übersetzungsverhältnissen umschaltbar ist. Eine Umschalteinrichtung (7) und eine Steuerung (10) sorgen für eine automatischen Umschaltung des Betriebszustands des Hochspannungserzeugers in Abhängigkeit von einem gewählten Arbeitspunkt der Röntgenröhre. Darüber hinaus wird ein Röntgengenerator mit einer solchen Schaltungsanordnung sowie ein entsprechendes Verfahren zur Erzeugung einer Röntgenröhrenspannung (U t ) beschrieben.
Abstract:
An electrical apparatus and method for matching the input power source and output impedance of the electrical apparatus utilizes electromagnetic devices having two or more inductive windings, which may be connected in various series and/or parallel circuit configurations, by inserting them into a circuit board specially configured to accept my improved electromagnetic devices, and attaching jumpers to the circuit board for selecting the particular inductive windings to be incorporated into the electrical apparatus. The windings not selected for a given electromagnetic apparatus remain unconnected within the electromagnetic device.
Abstract:
A method for manufacturing a tapped coil having a strong tap made upper of loops wound with a high efficiency, a tapped coil, and an apparatus for manufacturing a tapped coil are disclosed. A tap composed of a single loop or loops can be formed easily even at the start of the winding or at the end of the winding in the axial direction of the tapped coil. A coil wire (4) supplied from a coil wire supply unit not shown in the drawing is wound around a winding core (1) by rotating the winding core (1) while moving it in the direction indicated by an arrow (15) with respect to the fixed coil wire supply unit. A protruding bar (5) is protruded generally parallel to the winding core (1) when it is necessary and rotated around the winding core (1) in the direction indicated by an arrow (11) in synchronism with the rotation of the winding core (1); and the coil wire (4) is hooked on the protruding bar (5) and wound around the wiring core (1) and the protruding bar (5); thus forming loops (6a 6b). After the winding step, a tap (7) is formed by stranding the loops (6a, 6b) at another step to manufacture a tapped coil (6).
Abstract:
A step switch for a step transformer (1), preferably for a cast-resin encapsulated step transformer, has one-phase identical step switch modules (3.1, 3.2, 3.3) having each all means required for switching the load and its own housing for enclosing said means. The step switch modules are linked each by a driving shaft (4.1, 4.2, 4.3) to a motor drive (5). Each step switch module is directly arranged with no connecting lines on the output lines of a step winding or is connected thereto over a connecting terminal (2.1, 2.2, 2.3) and has fastening elements having the same geometrical configuration, as well as electric connecting elements (3.1.1, 3.1.2, 3.1.3) which are electrically connected with the step contacts to be wired inside the housing or which extend themselves into the inside of the housing through a recess (3.4) in the housing and directly form the wirable step contacts.
Abstract:
A transformer circuit (100) for an electric vehicle comprises an input (104); an output (106); and a transformer (108) located between the input and the output. The transformer comprises a primary winding (110) connected to the input; and a secondary winding (102) connected to the output. At least one of the primary winding and the secondary winding comprises a first split winding (112) and a second split winding (114). The first split winding is configured for carrying a higher current than the second split winding. The circuit comprises switching means (116) configured to, where the primary winding comprises the first and second split windings, selectively connect the first split winding to the input, or connect the first and second windings in series to the input, and where the secondary winding comprises the first and second split windings, selectively connect the first split winding (112) to the output (106), or connect the first and second split windings (112, 114) in series to the output.
Abstract:
An electrical power converter with segmented windings is provided. Comprises a transformer or autotransformer including a magnetic core (3) and at least a primary winding (51) and at least a secondary winding (52) arranged around the magnetic core (3). The primary winding and/or the secondary winding have at least one full turn that includes at least one power switch (10) and at least one capacitor (12) connected in series and arranged respectively opposite each other and facing opposite sides of the magnetic core, defining a cell (4) that is divided in four segments, a first segment (23) including said at least one switch, a second opposite segment (24) including said at least one capacitor, and two other connecting segments (21, 22) providing electrical connection between the first segment and the second segment, and each of said two other connecting segments having opposite electrical polarity.
Abstract:
In some examples, a variable inductor device includes a first planar loop comprising a first planar face and a material that supports electromagnetic coupling and a second planar loop comprising a second planar face and a material that supports electromagnetic coupling. The first planar loop is separable from the second planar loop to vary the inductance of the variable inductance device. In some examples, the first and second planar faces overlapping each other in a closed configuration of the device.
Abstract:
Laststufenschalter (L) zur unterbrechungslosen Umschaltung zwischen Wicklungsanzapfungen eines Stufentransformators nach dem Mittenschaltprinzip, wobei der Stufentransformator eine erste und eine zweite Wicklung (W1, W2) aufweist, wobei die erste Wicklung (W1) eine erste Regelwicklung (R1) mit ersten Wicklungsanzapfungen (WA1), und die zweite Wicklung (W2) eine zweite Regelwicklung (R2) mit zweiten Wicklungsanzapfungen (WA2) umfasst; wobei – der Laststufenschalter (L) einen Lastumschalter (LU) zur Durchführung einer Umschaltung zwischen zwei der ersten Wicklungsanzapfungen (WA1) oder zwischen zwei der zweiten Wicklungsanzapfungen (WA2), aufweist, wobei – der Lastumschalter (LU) einen Hauptzweig (Z1) mit mindestens einem Schaltelement (SE) und –einen Hilfszweig (Z2) mit mindestens einem strombegrenzenden Element (V), beispielsweise einem Varistor, umfasst.