Abstract:
A magnetic saturation apparatus for a wireless inductive power and/or data transfer system which comprises a magnetic field transmitter positioned on a first side of a barrier and a magnetic field receiver positioned on a second side of the barrier. The magnetic saturation apparatus includes a saturation magnet which is positioned on one side of the barrier and which in use generates a saturation flux in an adjacent saturation region of the barrier which is located at least partially between the transmitter and the receiver. The saturation flux effectively lowers the magnetic permeability of the saturation region and thereby inhibits the magnetic flux generated by the transmitter from shorting through the barrier and back into the transmitter. Thus, the saturation region facilitates the flow of magnetic flux from the transmitter into the receiver.
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:
An inductive device comprises a magnetic core including a portion of a plurality of wires, at least one electric winding extending around the magnetic core, each of the plurality of wires substantially encircling the at least one electric winding, and at least one biassing magnet disposed adjacent the plurality of wires to provide a bias magnet flux for offsetting a flux generated by a direct current component flowing in the winding.
Abstract:
A magnetic core is used for an open magnetic path, and this open magnetic core has a permanent magnet disposed on at least one magnetic path end of a magnetic body having soft magnetic characteristics which forms a magnetic path A coil component comprises this magnetic core and has at least one or more windings of one or more turns around the magnetic core where a permanent magnet is disposed on at least one magnetic path end of a magnetic body having soft magnetic characteristics. A power source circuit comprises the coil component and is so constituted that the polarity of a field impressed on the magnetic body of the soft magnetic characteristics generated by an excitation current flowing by the impressing of an input voltage on the windings mounted around the coil component may be opposite to the polarity of a field impressed on the magnetic body of the soft magnetic characteristics by the permanent magnet.
Abstract:
A current-switching device comprises a contact switch (1), a varistor (2) and a variable-resistance element (3) connected in parallel. The element is made from an electrically conductive soft magnetic powder, e.g. steel, coated with boride, carbide or nitride and immersed in a liquid, such as oil or perfluorinated polyether. the resistance of the element (3) is controlled by the magnetic field of an electromagnet (4). When the current in the main circuit is switched on or off, the electromagnet (4) is energised by a current pulse, which causes the element (3) to become conductive. During the current pulse, the contact switch (1) is either closed or opened, and this arrangement therefore prevents arcing occurring during switching. Alternatively, the element (3) can be connected in series with the contact switch. In this case, the magnet (4) is a combination of an electromagnet and a permanent magnet arranged to provide opposing magnetic fields within the element (3), such that, when the electromagnet is energised, the element (3) is non-conducting.
Abstract:
A fault current limiter is provided that comprises a magnetically saturable core. The first core includes a first leg, a second leg, with a first AC coil wound on the second leg, a third leg, with a second AC coil wound around the third leg, the first and second AC coils being wound in series and connected to a first phase AC source, and a fourth leg. The first magnetic biasing unit is arranged to produce a first closed magnetic circuit in the first leg and the second leg that has a first flux direction, and the second coil is arranged to produce a second closed magnetic circuit in the fourth leg and the third leg that has a second flux direction, wherein the first flux direction opposes the second flux direction. The first and second AC coils are arranged to produce a first closed AC magnetic circuit in the second and third legs in an AC flux direction that alternates with each AC half-cycle.
Abstract:
A fault current limiter is provided that comprises a magnetically saturable core. The first core includes a first leg, a second leg, with a first AC coil wound on the second leg, a third leg, with a second AC coil wound around the third leg, the first and second AC coils being wound in series and connected to a first phase AC source, and a fourth leg. The first magnetic biasing unit is arranged to produce a first closed magnetic circuit in the first leg and the second leg that has a first flux direction, and the second coil is arranged to produce a second closed magnetic circuit in the fourth leg and the third leg that has a second flux direction, wherein the first flux direction opposes the second flux direction. The first and second AC coils are arranged to produce a first closed AC magnetic circuit in the second and third legs in an AC flux direction that alternates with each AC half-cycle.