Abstract:
There is provided a wireless power transmission device including: a first resonant coil, a first magnetic body and a second resonant coil in which the first resonant coil is supplied with AC energy to generate a magnetic field, the first magnetic body varies a form of the magnetic field generated by the first resonant coil, the second resonant coil couples with the magnetic field varied by the first magnetic body to receive the AC energy, and the first magnetic body is disposed between the first resonant coil and the second resonant coil.
Abstract:
There is provided a wireless power transmission device including: a first resonant coil, a first magnetic body and a second resonant coil in which the first resonant coil is supplied with AC energy to generate a magnetic field, the first magnetic body varies a form of the magnetic field generated by the first resonant coil, the second resonant coil couples with the magnetic field varied by the first magnetic body to receive the AC energy, and the first magnetic body is disposed between the first resonant coil and the second resonant coil.
Abstract:
A transformer filter arrangement (30) for passing signals at a fundamental frequency and suppressing signals at one or more interfering frequencies is disclosed. It comprises a transformer (100) having a first winding (110) and a second winding (120), wherein the first winding (110) has a first end (112a) and a second end (122b) and the second winding (120) has a first end (122a) and a second end (122b). It further comprises one or more capacitors (130a-e). For each capacitor (130a-c) of a first set of at least one capacitor of the one or more capacitors (130a-e), the capacitor (130a-c) is connected between a pair of taps (a1, a2; b1, b2; c1, c2) of the first winding (110), wherein each tap (a1, a2, b1, b2, c1, c2) of the pair of taps (a1, a2; b1, b2; c1, c2) is located between the first end (112a) and the second end (112b) of the first winding (110), and the capacitor (130a-c), together with an inductive sub segment (140a-c) of the first winding (110), which is connected in parallel with the capacitor (130a-c) between the pair of taps (a1, a2; b1, b2; c1, c2), forms a parallel LC circuit which is tuned to resonate at one of said interfering frequencies for suppressing signals at said one of the interfering frequencies. A corresponding integrated circuit, a corresponding radio receiver circuit, a corresponding radio transmitter circuit, and a corresponding radio communication apparatus are also disclosed.
Abstract:
A photovoltaic (PV) power generation system includes at least one PV collection device (12) configured to generate a direct current (30), and a boost converter (32, 34) which is coupled to the PV collection device and configured to convert the direct current to an alternating current (36). The boost converter includes at least one direct current boost inductor (52). The boost inductor includes an inductor core (152) configured to form at least one closed magnetic circuit, at least one coil, and at least one permanent magnet configured to produce a first magnetic flux within the inductor core that flows in a first direction around the at least one closed magnetic circuit. A method for reducing core size and core loss of the inductor is also provided.
Abstract:
A magnetic device producing a small amount of leakage flux and capable of substantially eliminating the amount of leakage flux that escapes the magnetic core of the device. The device includes at least a portion of an electronic circuit that includes an interphase transformer arranged on a magnetic core. The reactor windings on each leg of the magnetic core are disposed in close proximity to each other and can be wound concentrically or in a bifilar fashion. The resulting combination of the magnetic core and windings provides a high degree of magnetic coupling between reactor windings disposed on the same leg and between reactor windings disposed on differing legs. The high degree of magnetic coupling substantially reduces the amount of leakage flux that can affect other metal objects proximate the magnetic device.
Abstract:
This invention relates to winding means to destroy any effects of external magnetic fields freely on a transformer in direction of external magnetic fields in lower power current transformers. In this invention, basic principle is that, when you take a look to whole winding, half of total number of windings is wound in a straight way, and the other half is wound in a reverse direction.
Abstract:
Die Erfindung umfasst dynamisches Auskopplungssystem, wobei der Querschnitt der Leitungen der primären und sekundären Spulen der Transformatoren gleich sind, während ihre Windungszahl unterschiedlich ist.
Abstract:
8-shaped and. clover-shaped inductor layouts are described that minimize the amount of crossing points. Each crossing point increases resistance of inductor and capacitance between windings. Therefore, by keeping the number of crossings points at a minimum, the quality factor of an inductor increases. The present inventions relates to 8-shaped and clover-shaped inductor layouts, wherein the amount of crossing points is minimized. Many 8-shaped and clover- shaped layouts have been described in the prior art. These have, however, typically been directed to reducing magnetic field effects thereof. Therein, symmetry is of relevance.
Abstract:
The present invention relates to a transformer assembly (1) and a process for manufacturing same. The transformer (1) comprises a primary winding (5) wound on a PCB (9) and a secondary winding (7) mounted adjacent to the primary winding. The primary winding comprises a spiral coil, for example of wire or insulated wire, wound on the PCB. Gate drive windings (31, 33) are incorporated in the PCB (9) and there is therefore very close coupling between the primary winding and the gate drive windings. Furthermore, the secondary winding (7) is a centre-tapped secondary having two halves. A flux balance winding (13) is provided to connect the two halves of the centre-tapped secondary winding (7) and minimise leakage inductance thereby reducing power loss and spiking effects and obviating the need for complex control arrangements.
Abstract:
A method of treating copper sulphide deposits on materials and surfaces that are in contact with electrically insulating oil inside an electrical apparatus, wherein a substantial amount of the electrically insulating oil, normally present in said electrical apparatus, have been removed. The copper sulphide is subjected to treatment with an oxidizing agent which causes a reaction with the copper sulphide deposits. The oxidizing agent can comprise any compound from the list; chlordioxide, a peroxy acid or ozone.