4results about How to "Improve coupling coefficient" patented technology

The application discloses an unmanned aerial vehicle wireless charging coupling system, a coil winding method and an unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicle charging. The charging coupling system comprises a transmitting device and a receiving device, the transmitting device comprises a transmitting coil, the receiving device comprises a receiving coil, and further comprises a landing device, the receiving device is arranged on the landing device, and the transmitting device is arranged in a parking area; the transmitting device comprises a ferrite, the ferrite comprises a connecting portion and a stepped symmetrical protruding structure extending outward at the end of the connecting portion, the ferrite as a whole is in a U shape, and the transmitting coil is wound vertically in the U-shaped structure of the ferrite; the receiving device comprises a soft magnet, the receiving coil is wound on both sides of the landing device, a rectangular gap is arranged in the middle of the receiving coil, the soft magnet is arranged in the rectangular gap, and the lower part of the soft magnet is attached to the lower part of the rectangular gap. The coupling system has small space occupation, large coupling coefficient, can realize efficient energy transmission, and is convenient to install and does not affect the flight performance of the unmanned aerial vehicle.

The embodiment of the invention discloses implantable peripheral nerve electrical stimulation equipment. The implantable peripheral nerve electrical stimulation equipment comprises a main body part, a battery part and a stimulation part, a controller is arranged in the main body part, the battery part comprises a power supply, a coating film, a charging coil and a first shell, the charging coil sleeves the outer side of the power supply, and the coating film is made of a flexible permanent magnet material and coats the outer surface of the power supply to form a magnetic core of the charging coil. According to the embodiment of the invention, the overall structure of the battery part can be supported and protected through the first shell made of an insulating material, and the efficiency of wireless energy and information transmission between the charging coil and the outside can be improved due to the self-insulating characteristic of the first shell, so that the situation that eddy current is generated on the first shell to cause temperature rise is avoided; through the arrangement of the coating film, the charging coil can be matched with a power supply, a magnetic core structure is formed in the center of the charging coil, the charging efficiency is further improved, a charging magnetic field can be shielded, and eddy current is prevented from being generated on a shell of the power supply.

The application discloses a multi-winding transformer, which comprises a framework and a magnetic core body fixed on the framework, and a first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4 and a shielding layer winding N5 are sequentially and layer by layer wound on the framework; when the second primary winding N4 is wound, the second primary winding N4 is wound on the take-up end of the first primary winding N1, and the start end and the take-up end of the first primary winding N1 and the start end of the second primary winding N4 are all sleeved with an insulating sleeve for providing insulation protection. The primary winding is wound in a layered manner, and the secondary winding is wrapped, so that the magnetic resistance between the primary winding and the secondary winding is reduced through the structure of being tightly wrapped, the coupling interference caused by the distributed capacitance and the leakage inductance is reduced, the coupling coefficient between the primary winding and the secondary winding is improved, and the electromagnetic compatibility of the transformer is improved.

The invention provides a directly modulated laser, which comprises a substrate, an epitaxial layer, a buffer layer, a grating layer, a lower limiting layer, an active layer, an upper limiting layer, a corrosion cut-off layer, a cladding and a contact layer, the structure of the grating layer is a convex grating structure with a lambda / 8 phase shift, the grating layer is located on the N-type doped side, and the convex grating structure with the lambda / 8 phase shift is used for reducing the photon density at the phase shift position through the negative reflector loss feedback effect and limiting hole gathering on the P-type doped side through the characteristic that the electron mobility is larger than the hole mobility.