An ignition coil includes a primary coil and a secondary coil magnetically coupled from each other; a core cover disposed around the primary coil and the secondary coil; and an outer peripheral core supported by the core cover. The core cover includes a pair of support portions that support the outer peripheral core; and at least one of the pair of support portions includes a flexible portion that elastically presses the outer peripheral core, the flexible portion having flexibility in an arrangement direction separating the pair of support portions.

An electromagnetic wave shielding film having a wireless energy conversion function is disclosed, which is attached to an exterior surface of the door of a microwave oven and used to absorb electromagnetic waves released by the microwave oven during operation. The electromagnetic wave shielding film comprises: a substrate carrier; a first substrate layer, provided on one side of the substrate carrier, where a wireless energy conversion unit is provided in the first substrate layer and is used to receive the electromagnetic waves and covert the electromagnetic waves to DC electrical energy; and an optically variable assembly, provided on the other side of the substrate carrier, where the optically variable assembly comprises an electrochromic layer and an electrode layer; the electrode layer is used to receive the DC electrical energy from the wireless energy conversion unit and drive the electrochromic layer to change its light transmission property.

A matrix transformer, a power converter, and a matrix transformer winding arrangement method. Each of the magnetic core columns of n sub-transformers of the matrix transformer is wound with a first winding and a second winding, first windings are used to form a high-voltage-side winding of the matrix transformer, and second windings are used to form a low-voltage-side winding of the matrix transformer. A ratio of a turn quantity design value of the high-voltage-side winding to the quantity n of the sub-transformers is not an integer.

A neodymium-iron-boron (NdFeB) magnet is represented by a chemical formula R1-R2-Fe-M-B, and has a composite structure of a high-coercivity region and a high-remanence region. In the formula R1 is a rare earth element comprising at least Nd, R2 is a heavy rare earth element comprising at least Dy and/or Tb, and M is a transition metal element comprising at least Co. The neodymium-iron-boron magnet can greatly improve resistance to high-temperature demagnetization and inhibit reduction of magnetic flux of a magnet by adopting a small amount of Dy/Tb. The magnet can be used in an embedded high-speed motor. The preparing method for the magnet improves the material utilization and the production efficiency, and is feasible for a large-scale production.

An insulating transformer includes a plurality of sub-insulating transformers connected in series. Polarity directions of all sub-windings are identical. When a current I flows from a first main terminal to a third main terminal through the first sub-winding, an interphase capacitance, and the second sub-winding, excitation inductance of the first sub-winding and excitation inductance of the second sub-winding are configured to have opposite polarities.

A wireless power-supply system (1) performing a wireless power supply between a vehicle (10) and a stop station (20), wherein the wireless power-supply system includes a heat-transfer device (30). The heat-transfer device (30) transfers heat generated due to the wireless power supply to the stop station (20) having high heat capacity from the vehicle (10) having low heat capacity. The heat-transfer device (30) includes a flexible heat-transfer member (32), in which the flexible heat-transfer member has tiltability in a moving direction of the vehicle (10).

A wireless power transmission apparatus includes a resonator configured to transmit power through a resonance with another resonator, a switch configured to connect the resonator to a power source, a setting unit configured to set a target amount of current to flow in the resonator, and a control unit configured to control the switch based on the target amount of current.

In a case where a power transmission device operating as a master disappears, a wireless power feeding system selects a power transmission device to operate as a master instead based on predetermined priority levels.

Methods and systems for automatically aligning a power-transmitting inductor with a power-receiving inductor. One embodiment includes multiple permanent magnets coupled to and arranged on a surface of a movable assembly accommodating a power-transmitting inductor. The permanent magnets encourage the movable assembly to freely move and/or rotate via magnetic attraction to correspondingly arranged magnets within an accessory containing a power-receiving inductor.

The present invention provides a resonant wireless power receiver circuit, comprising: a resonant circuit for receiving a wireless power to generate a AC resonant signal which has an amplitude; a bridge rectifier circuit which includes a multi-mode switch, for rectifying the AC resonant signal to a rectifier output signal to drive a load, wherein the rectifier output signal includes a rectifier output voltage and a rectifier output current; and a feedback control circuit for generating a switch control signal according to a feedback signal related to the rectifier output signal to control the multi-mode switch to operate in a Conductive Operation at least for a partial time in a cycle period, such that the rectifier output voltage is substantially twice the amplitude, or the rectifier output voltage corresponds to an output voltage reference and/or the rectifier output voltage corresponds to an output current reference.