A wireless power transmission system includes: a power transmitting device; a power receiving device; and a relay device. In a state where the relay side switch circuit has the relay side rectifier and the relay side load in a non-contact state, and the receiving side switch circuit has the receiving side rectifier and the receiving side load in a non-contact state, power is transmitted from the power transmitting device to the power receiving device via the relay device. After a DC voltage output from the receiving side rectifier reaching a requested voltage of the power receiving device, the receiving side switch circuit connects the receiving side rectifier to the receiving side load at a timing T2 that is different from a timing T1 at which the relay side switch circuit connects the relay side rectifier to the relay side load.

A wireless power transfer standard selector of a power receiving device and a method therefor are disclosed. A wireless power transfer standard selector according to one embodiment comprises: a frequency sensor for sensing an input frequency of a rectifier; a boot attempt counter for counting and storing the number of bootings in which an output voltage of a power converter is generated and then disappears; and a selection unit for selecting a wireless power transfer standard method by using the input frequency sensed through the frequency sensor and/or the number of bootings counted through the boot attempt counter.

An assembly for power converting includes a circuit board, a power switching circuit mounted on the circuit board, an inductor coil that includes a winding and two ends, a magnetic core that is surrounded by the winding of the inductor coil, and a magnetic mixture that encapsulates the circuit board, the power switching circuit, the inductor coil and the magnetic core. The winding of the inductor coil is stacked above the power switching circuit and is sufficiently large to fill up a size of the assembly.

A magnetic flux pad for receiving or generating magnetic flux. The pad includes two pole areas (11, 12) associated with a magnetically permeable core 14. Coils 17 define the pole areas. The pad allows useable flux to be generated at a significant height above a surface of the pad.

A system configured to provide galvanic isolation of data or power signals between primary and secondary sides. In various forms, the system may provide galvanic isolation with primary side passive or active sensing of a secondary side load, and with secondary side control for dual data and power control over a single galvanic interface; with series capacitive, series capacitive and resistive, alternating series capacitive and resistive, or series and parallel capacitive galvanic isolation, or series and parallel capacitive galvanic isolation for multiple isolated ground planes; using Manchester encoding across the galvanic isolation region; using differential power and data across the galvanic isolation region; using an isolated common reference for data and power links across the galvanic isolation region; using controller area networking across the galvanic isolation region; or using a resonant configuration and having feedback between the galvanic interface, only on the primary side, or only on the secondary side.

Provided is a wireless power transmission device to reduce an electromagnetic wave except for a signal to be transmitted during wireless power transmission, the wireless power transmission device including a transmitter configured to generate a magnetic field by inputting a high-frequency power signal generated by a transmission circuit into a first coil, a receiver configured to generate an induced current by allowing the generated magnetic field to pass through a second coil, and a reducer configured to reduce a harmonic component of the high-frequency power signal using a third coil inserted on a path between the transmitter and the receiver.

According to one embodiment a transformer that includes a core having a central arm and first and second outer arms on opposite sides of the of the central arm, a primary winding surrounding the central arm and a secondary winding surrounding the central arm is disclosed. The transformer further includes a primary winding casing surrounding the primary winding, a secondary winding casing surrounding the secondary winding, and at least two spacers including a first spacer and a second spacer. The first spacer is configured and arranged to space the primary winding casing away from a bottom of the core and the outer arms and the second spacer is configured and arranged to space the secondary winding casing away from the primary winding casing and the outer arms.

According to one embodiment a transformer that includes a core having a central arm and first and second outer arms on opposite sides of the of the central arm, a primary winding surrounding the central arm and a secondary winding surrounding the central arm is disclosed. The transformer further includes a primary winding casing surrounding the primary winding, a secondary winding casing surrounding the secondary winding, and at least two spacers including a first spacer and a second spacer. The first spacer is configured and arranged to space the primary winding casing away from a bottom of the core and the outer arms and the second spacer is configured and arranged to space the secondary winding casing away from the primary winding casing and the outer arms.

A reactor includes a plurality of iron cores and a winding wound on any of the plurality of iron cores; a gap is formed between two iron cores facing against each other; a gap-facing surface of one iron core has an area larger than that of a gap-facing surface of the other iron core.

A reactor includes a plurality of iron cores and a winding wound on any of the plurality of iron cores; a gap is formed between two iron cores facing against each other; a gap-facing surface of one iron core has an area larger than that of a gap-facing surface of the other iron core.