20results about How to "Improve coupling coefficient" patented technology

The invention provides a cavity type bulk acoustic wave resonator with a Bragg reflection layer and a preparation method of the cavity type bulk acoustic wave resonator, and relates to the technical field of bulk acoustic wave resonator manufacturing. The cavity type bulk acoustic wave resonator comprises a first substrate, a bottom electrode, a piezoelectric layer and a top electrode which are stacked in sequence, a cavity is formed between the first substrate and the bottom electrode, the cavity is provided with a plurality of supporting columns, the supporting columns are used for supporting the first substrate and the bottom electrode, each supporting column comprises at least one group of Bragg reflection layers, and the Bragg reflection layers are arranged in the cavity. The Bragg reflection layer is formed by stacking a first material and a second material, and the acoustic impedance of the first material is higher than that of the second material. The cavity type bulk acoustic wave resonator solves the problem that an existing supporting column increases energy loss, and it is guaranteed that the resonator has more stable performance while the electromechanical coupling coefficient is increased.

The utility model discloses a charger and a charging system in the technical field of medical instruments, the charger is used for charging an implantable device, the implantable device is used for being implanted into the skull of a user, the implantable device comprises a receiving coil, the charger comprises a transmitting coil, the transmitting coil is used for being coupled with the receiving coil, and the receiving coil is used for receiving the transmitting coil. At least part of the transmitting coil is in an arc shape, and the arc shape is at least matched with the skull of the user. By adopting the transmitting coil adaptive to the radian of the human skull, the radian of the human skull and the shape of the nerve stimulator can be better matched, so that the distances from the surface of the receiving coil to the surface of the transmitting coil are equal everywhere in the receiving area, and the magnetic flux variation in the receiving area is improved; the coupling coefficient between the transmitting coil and the receiving coil is improved, and the induction voltage and current of the receiving coil are improved, so that the charging efficiency is improved.

The invention provides a coupler offset monitoring and control method suitable for underwater wireless charging, and the method comprises the steps: designing the structure of a repeating coil according to a coupler, and determining that the current of the repeating coil can represent the mutual inductance coefficient change of the repeating coil and a secondary side coil; utilizing a BP neural network to obtain a resolving matrix of the coupler offset and the relay coil current; in the charging process, according to the collected current value, the offset direction and offset of the primary side coil and the secondary side coil are determined through a resolving matrix, a control mechanism of the primary side coil is controlled to be aligned with the secondary side coil, and therefore it is guaranteed that the coupler keeps accurate coupling. According to the relay coil, the coupling coefficient can be enhanced, the electromagnetic field transmission distance can be expanded, passive anti-offset can be achieved, current parameters in the array relay coil can serve as monitoring objects, offset and deflection detection can be achieved through coil array current sampling, active anti-offset is conducted, and the underwater wireless charging efficiency and stability are improved.

The invention discloses a silicon-based terahertz quintuple frequency multiplier based on a semi-closed coupling structure, comprising an input balun, a fourth harmonic frequency multiplication unit, an interstage transformer, a single-balanced mixer unit and an output balun. A single-ended fundamental wave signal is converted into a differential signal by the input balun and injected into the frequency multiplication unit. At the same time, a differential signal is split from the differential port of the input balun as the local oscillator of the mixer unit. The frequency multiplication unit generates a fourth harmonic and injects it into the source end of the mixer unit in a single-ended mode as an intermediate frequency signal. The mixer unit mixes the fundamental wave and the fourth harmonic to generate a five-fold frequency differential signal, and the output balun converts the differential signal into a single-ended output. Both the input balun and the output balun adopt a semi-closed coupling structure to reduce the coupling loss of passive devices. The structure has the characteristics of strong coupling and high design freedom, solves the problem of large loss of the passive coupling structure of the silicon-based millimeter-wave terahertz circuit, and improves the output power of the terahertz frequency multiplier.

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 invention belongs to the technical field of optical devices, and discloses a micro-ring filter and a design method thereof. The method comprises the following steps: establishing a simulation model of a micro-ring filter by utilizing a three-dimensional time domain finite difference algorithm, wherein the micro-ring filter comprises a micro-ring region and a coupling waveguide region; according to a set free spectral range and a set coupling coefficient, the fundamental mode transmittance is taken as an optimization target, the first curve is taken as a waveguide center curve, the width of the waveguide is adjusted by utilizing a second curve, and a micro-ring region and a coupling waveguide region are reversely designed; and iteratively optimizing to obtain a group of optimal micro-ring structure parameters and a group of optimal coupling waveguide structure parameters, and finishing the design of the micro-ring filter. According to the invention, the free spectral range can be obviously improved, and the loss performance of the micro-ring filter is improved.

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) planar transformer and a preparation method thereof, the transformer comprises an upper margin, a lower margin and a plurality of middle substrates, the upper margin, the lower margin and the plurality of middle substrates are formed by ferrite raw tapes, annular areas are arranged on the plurality of middle substrates, PET (Polyethylene Terephthalate) films at the bottoms of the raw tapes are reserved in the annular areas, and printing paste is used for filling in the annular areas. Silver paste is printed through a screen plate to form an internal winding, and a via hole is formed in the annular area of each middle substrate corresponding to the winding. After the transformer is prepared according to the above steps, each layer of the transformer is preliminarily fused through warm water isostatic pressing, glue discharging sintering is carried out through a sectional type sintering furnace, silver bonding is carried out on a leading-out terminal electrode through a special silver bonding jig after sintering, and the terminal electrode is formed through electroplating after silver sintering. According to the invention, the problems of cracking, voids and warping easily occurring in the sintering process are solved, and meanwhile, the coupling coefficient of the product is increased from 90% to 95% or above.

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.

The present invention relates to a multi-wire parallel-wound coil disk for magnetically coupled wireless power transmission, including a coupling coil, a high-frequency soft magnetic body, a shielding aluminum plate and other components. The coupling coil is planar, formed by a plurality of wires tightly wound together, and can be a single coil or a plurality of coils. When it is a single coil, the starting and ending points of the plurality of wires wound together are rotationally symmetrically distributed in the coil plane, that is, the single coil wound by each wire has rotational symmetry and has the same inductance and resistance value, and direct parallel connection can balance the current of each wire. When it is a plurality of coils, the encircling parts of each coil constituting the plurality of coils are rotationally symmetrically distributed in the plane of the plurality of coils with the center of the entire coupling coil. Under the premise of satisfying the current density, the present invention realizes the optimal coverage width of the coil and the tight winding of the plurality of wires, which can greatly improve the coupling coefficient and reduce electromagnetic exposure; the number of coil turns (which can be a non-integer) can also be adjusted at will to obtain accurate inductance.

The utility model discloses a coupling inductance device which comprises an insulating magnetic core, at least two grooves are arranged in the insulating magnetic core, and the at least two grooves are arranged at intervals along a first direction; the windings are positioned in the grooves in a one-to-one correspondence manner; the insulating magnetic core further comprises at least one containing hole, the containing hole extends in the second direction and is located between every two adjacent grooves, every two adjacent grooves in the first direction are connected through one containing hole, and the second direction and the first direction intersect. The non-magnetic insulating layer is located in the containing hole, and the coupling coefficient between the two windings is related to the thickness of the non-magnetic insulating layer located between the two windings in the third direction. According to the utility model, the short circuit between the two windings can be avoided, the coupling coefficient of the two windings can be improved, and the energy storage capability and the anti-saturation performance are enhanced.

The invention discloses a truncated cone type unmanned aerial vehicle wireless charging device based on a bipolar transmitting coil, which belongs to the technical field of magnetically coupled wireless power transmission, and aims to solve the problem that when a truncated cone type unmanned aerial vehicle is wirelessly charged, the coupling coefficient between a transmitting coil and a receiving coil is not high, which affects the wireless charging efficiency of the unmanned aerial vehicle. The invention comprises a ray coil comprising two trapezoidal coils of different sizes and opposite winding directions, the two trapezoidal coils are curled along the circumference so that the two oblique sides are close to each other and form a truncated cone shape, and are distributed in two close sections along the truncated cone inclined surface, the receiving coil is a spiral tube coil, and the tube core line of the receiving coil is parallel to the truncated cone inclined surface generatrix along which the transmitting coil is located, so that when the transmitting coil is coupled with the transmitting coil in this way, it is beneficial to provide a higher coupling coefficient, the lack of a magnetic field has a smaller effect on the mutual inductance, the mutual inductance fluctuation rate is reduced when the unmanned aerial vehicle rotates and deviates, and the wireless charging efficiency of the unmanned aerial vehicle is improved.

The embodiment of the invention provides an isolated resonant power supply circuit, a magnetic resonance imaging system and an air-core transformer, the isolated resonant power supply circuit is arranged in a scanning room of the magnetic resonance imaging system, the isolated resonant power supply circuit comprises an inverter circuit, a resonant transformation circuit and a rectifying circuit, the inverter circuit is connected with the resonant transformation circuit, and the resonant transformation circuit is connected with the rectifying circuit. The converter is connected with the resonant transformation circuit and is used for converting input direct current into alternating current and outputting the alternating current to the resonant transformation circuit; the resonant transformation circuit is used for carrying out resonant conversion and transformation on the alternating current and then outputting the alternating current to the rectifying circuit; the rectifying circuit is used for rectifying the alternating-current output voltage output by the resonant transformation circuit into direct-current voltage to be output for power supply; wherein the resonant transformation circuit comprises a variable capacitance circuit and an inductor, and the equivalent capacitance value of the variable capacitance circuit is changed by changing the input voltage of the variable capacitance circuit.

The present invention provides a novel wireless power transfer (WPT) system configured to cover a relatively large area and volume while maintaining continuous, constant, high-coupling and efficient energy transfer between a transmitter and a receiver of a wireless power supply and charging system in motion.

The invention discloses a semiconductor structure and a forming method thereof, and the method comprises the steps: providing an initial substrate which comprises a plurality of active regions; the active regions are etched to form a substrate, the substrate comprises channel regions located in the active regions, and each channel region is provided with at least one convex part or at least one concave part or a combination of a plurality of convex parts and a plurality of concave parts; and forming a storage gate structure on the surface of the channel region, wherein the projection of the convex part or the concave part on the surface of the substrate is located in the projection range of the storage gate structure on the surface of the substrate. According to the semiconductor structure and the forming method thereof, the channel length of a flash memory device is increased, and the erasing efficiency of the device is optimized.

The present disclosure provides an isolated power chip based on wafer-level packaging, including: a micro-transformer based on RDL, whose primary coil is connected to a DC power supply and outputs a DC voltage input by the DC power supply; a transmitting chip connected to the primary coil of the micro-transformer based on RDL, used to receive the DC voltage and convert it into an AC signal for transmission to the secondary coil of the micro-transformer based on RDL; a receiving chip connected to the secondary coil of the micro-transformer based on RDL, used to convert the AC signal into a DC signal, generate a control signal capable of stabilizing the output voltage according to load changes, and encode the control signal for digital isolation. The present disclosure also provides a method for preparing an isolated power chip based on wafer-level packaging.

The invention provides a storage unit, an integrated circuit, a memory, a logic chip and electronic equipment. The storage unit comprises a substrate; along the thickness direction of the substrate, the first gate oxide layer is arranged on one side of the substrate, and the control gate is arranged on one side, deviating from the substrate, of the first gate oxide layer; a second gate oxide layer and a floating gate; the second gate oxide layer is arranged on the substrate, the second gate oxide layer and the first gate oxide layer are located on the same side of the substrate in the thickness direction, the second gate oxide layer and the first gate oxide layer are arranged at intervals in the length direction of the substrate, and the floating gate is arranged on the side, away from the substrate, of the second gate oxide layer; wherein the first gate oxide layer comprises a first dielectric layer, and the dielectric constant of the first dielectric layer is greater than 16. By using the storage unit, the problem that a multi-layer MASK needs to be used due to the fact that the storage unit in an existing Flash storage is of a multi-layer vertical structure can be solved, and reduction of the cost of the storage is facilitated.

The embodiment of the invention provides a high-order mode Lamb wave resonator and a preparation method thereof, and belongs to the field of radio frequency MEMS devices. The high-order mode Lamb wave resonator comprises a substrate, wherein a release cavity is formed in the center of the upper surface of the substrate; the piezoelectric vibration structure is suspended in the release cavity; a top interdigitated electrode disposed on an upper surface of the piezoelectric vibration structure and including a body electrode and a bus region connected to the body electrode; the bottom plate electrode is arranged on the lower surface of the piezoelectric vibration structure, and the bus area is provided with an empty groove structure used for restraining a transverse stray mode. The stray-free high-order modal Lamb wave resonator disclosed by the invention has the characteristics of no stray and high frequency.

The invention discloses a semiconductor structure and a forming method thereof. The suspension gate layer is located at the top of the substrate; the groove is located in the suspension gate layer; and the control gate layer is located at the top of the suspension gate layer, and the groove is filled with the control gate layer. The contact surface between the control gate layer and the suspension gate layer comprises the contact surface in the horizontal direction and the contact surface in the vertical direction, so that the contact area between the control gate layer and the suspension gate layer is increased, the coupling capacitance between the control gate layer and the suspension gate layer is increased, and under the condition that the coupling capacitance between the control gate layer and the suspension gate layer is increased, the contact area between the control gate layer and the suspension gate layer is increased. In this way, the coupling coefficient of the control gate layer to the suspension gate layer is increased, so that the number of storage charges in the suspension gate layer is increased, and the storage performance of the semiconductor structure is improved.