A transformer includes a core with a surface, a primary winding with two or more primary winding turns wrapped about the core, and a secondary winding with one and only one secondary winding turn extending about the core. The one and only one secondary winding turn is interleaved among the two or more primary winding turns on the surface of the core to limit magnetic flux leakage along the primary winding and the secondary winding. Power converters and power conversion methods are also described.

An electric transformer comprising a first magnetic circuit coupling a primary coil and a secondary coil, the first magnetic circuit comprising a first limb extending along a vertical axis, the primary coil comprising inner and outer primary coils connected in series, the inner primary coil, the secondary coil, and the outer primary coil being cylindrical and arranged concentrically around the first limb, wherein the inner primary coil, the secondary coil and the outer primary coil are mounted in a manner to maintain a predefined inner gap between the inner primary coil and the secondary coil and a predefined outer gap between the secondary coil and the outer primary coil, the inner and outer gaps being evaluated along a radial direction relative to the vertical axis, the inner and outer gaps increasing a leakage of a magnetic flux between the first coil and the secondary coil. The electric transformer comprising an additional second magnetic circuit having selected limb(s) that pass through predefined gap(s) between coils thereby providing preferred increase in leakage magnetic flux between the first coil and the secondary coil.

New and Useful magnetic structures are provided. One feature of the magnetic structures is that they are configured to help minimize the air gap reluctance, improving the magnetic structure's coupling coefficient. Another feature is that reducing the windings AC impedance of a magnetic structure is produced by shielding the winding under ears formed of magnetic material. Still another feature is that leakage inductance of a magnetic structure is reduced, by making ears with cuts which converge toward the magnetic rods that are used in the formation of the structure.

A switching power converter includes a first switching stage, a second switching stage, a coupled inductor, and a boost winding. The coupled inductor includes a first phase winding, a second phase winding, and a magnetic core. The first phase winding is wound at least partially around a first portion of the magnetic core, and the first phase winding is electrically coupled to the first switching stage. The second phase winding is wound at least partially around a second portion of the magnetic core, and the second phase winding is electrically coupled to the second switching stage. The boost winding forms at least one turn such that mutual magnetic flux associated with each of the first and second phase windings flows through the at least one turn.

A rotary joint includes a first part and a second part configured to rotate around a rotation axis against the first part. The first part has a first magnetic core and a capacitive data link component. The second part has a second magnetic core for coupling power with the a first magnetic core and a second capacitive data link component to transfer data from and/or to the first capacitive data link component. To weaken magnetic stray fields from the magnetic core, a resonant shield is provided outside the airgap between the magnetic cores. The resonant shield comprises an open ring-shaped structure, having two open ends which are connected by a capacitor to form a resonant circuit.

An isolated switch-mode power supply includes at least one input, at least one output, and a power circuit coupled between the at least one input and the at least one output for converting an input voltage or current to an output voltage or current. The power circuit includes a transformer having one or more primary windings, one or more secondary windings, an electrical insulator, and a core magnetically coupling the one or more primary windings and the one or more secondary windings. Upper portions of the primary and secondary windings are covered with the electrical insulator. Other example switchmode power supplies, transformers, magnetic chokes and methods are also disclosed.

Deterioration of a storage battery included in an electronic device is reduced. Power consumption of an electronic device is reduced. A power feeding device having excellent performance is provided. The power feeding device includes a power feeding coil, a control circuit, and a neural network and has a function of charging a storage battery with a wireless signal supplied by the power feeding coil. The control circuit has a function of estimating a remaining capacity value of the storage battery, the control circuit has a function of supplying the estimated remaining capacity value to the neural network, the neural network outputs a value corresponding to the supplied remaining capacity value to the control circuit, the control circuit determines a charge condition for the storage battery on the basis of the value output by the neural network, and the power feeding device has a function of charging the storage battery under the determined charge condition.

A structure of coils for a wireless charger comprises a plurality of coils, wherein the plurality of coils are stacked into a plurality of layers of coils with each layer comprising at least two coils, wherein at least two electronic devices are capable of being placed over the plurality of coils for charging the at least two electronic devices.

This application provides a magnetic integrated device, a power conversion circuit, a charger, and an electric vehicle, and pertains to the field of power electronics technologies. The magnetic integrated device includes a magnetic core, a first transformer winding, and a second transformer winding, where the first transformer winding and the second transformer winding are separated and wound, and a first air gap is formed at separation. A magnetic line may pass through the first air gap to form leakage inductance, and the leakage inductance may be equivalent to resonant inductance in the power conversion circuit. Therefore, there is no need to separately dispose an inductor winding in the magnetic integrated device. This effectively reduces a volume and a weight of the magnetic integrated device. In addition, the power conversion circuit that uses the magnetic integrated device also has a relatively small volume and relatively high-power density.

The present disclosure relates to the field of medical devices generally and specifically, to endoscopic systems and methods for resection of malignant and pre-malignant lesions within the gastrointestinal (GI) tract. In particular, the present disclosure relates to systems and methods for delivering injectable compositions between tissue layers (e.g., between the muscularis and submucosa layers) to elevate and stabilize the lesion for fast and efficient resection.