75 results about "Magnetic resonant coupling" patented technology

The invention discloses a self-adaptive wireless charging system, comprising an alternating-current power supply, a load, an AC (alternating current)/DC (direct current) conversion module, a driving module, a driving coil, an emitting coil, a receiving coil, a load coil, a rectifying module, a receiving end impedance matching module and a feedback control module, wherein the alternating-current power supply is connected with the driving coil by the AC/DC conversion module, the driving module, the emitting end impedance matching module and the driving coil that are sequentially connected with one another; the driving coil is coupled with the emitting coil; the emitting coil can transfer energy to the receiving coil by magnetic resonance coupling; the receiving coil is coupled with the loadcoil; the load coil is connected with the load by the rectifier module and the receiving end impedance matching module that are connected with each other sequentially; and the receiving end impedancematching module is connected with the driving module by the feedback control module. The self-adaptive wireless charging system can control the transmitting power of the wireless power supply, can improve the stability and running efficiency of the system, can improve the power factor of the system by a power compensation unit, and can reduce energy loss.

A wireless power transmission apparatus includes a wireless power transmitter for wirelessly transmitting power to at least one wireless power receiver by magnetic resonance coupling; and a master wireless power receiver that is wire-connected to the wireless power transmitter for communication, and performs peer-to-peer wireless communication with the at least one wireless power receiver. A resonant frequency used for the peer-to-peer wireless communication between the master wireless power receiver and the at least one wireless power receiver is identical to a resonant frequency used for the wireless power transmission between the wireless power transmitter and the at least one wireless power receiver.

An apparatus for reducing a radiation power and an electric field includes a transmission end energy transfer unit configured to include a feeding roof and a transmission coil, a receiving end energy transfer unit configured to be symmetrically separated from the transmission end energy transfer unit at a predetermined distance, and to include a receiving roof and a receiving coil, a first electric field shield configured to be made of a nonconductor, to have a shape surrounding the transmission end energy transfer unit, and to have an empty space of a predetermined first thickness; and a second electric field shield to be made of a nonconductor, to have a shape surrounding the receiving end energy transfer unit, and to have an empty space of a predetermined second thickness, wherein the empty spaces are filled with a dielectric material for shielding the electric field.

The invention provides a multi-loop control method for a magnetic resonance coupling wireless power transmission system. According to the method, three loops are used for controlling the resonance current on the transmitting side, the output voltage on the receiving side and equivalent load resistance respectively, the three loops are matched, and therefore safety, stability and high efficiency of the system are guaranteed. By the adoption of the method, the main control requirements of the magnetic resonance coupling wireless power transmission system are met, the method is effective and easy to use, and multiple purposes are achieved.

The invention provides a magnetic resonance coupling wireless charging system based on photoelectric encryption. Energy transfer is carried out on a primary side transmitting coil and a load circuit of the system through electromagnetic coupling connection among a single chip microcomputer control switching group, a resonance unit and the load circuit. Transfer of a charging request signal and secret key information is carried out on a primary side circuit to be decrypted and the load circuit through an electric signal encryption unit, an electric signal control LED light frequency signal unit, a specific frequency LED light-emitting unit and an LED light signal frequency decoding unit. Electric energy transmission can be encrypted by carrying out photoelectric encryption on the frequency. One-time linear encryption is carried out by applying a single chip microcomputer programmer to generate a secret key, so that frequency adjustment unpredictability is realized. The magnetic resonance coupling wireless charging system has the advantages that directional supply is achieved for charging electronic equipment is achieved, wireless charging safety is improved, and meanwhile an illuminating function is provided in an LED light encryption mode.

The embodiment of the invention provides a wireless charging device and system, relates to the technical field of electronic, provides a wireless charging scheme, and aims to solve the problems that wireless charging equipment is heavy in design and a transmitting terminal only can correspond to a single receiving terminal, and improve wireless charging practicability of the equipment. The method comprises the following steps: an integral receiving capacitor is formed by correct para-position of a capacitor polar plate of a wireless charging receiving coil in a wireless charging adapter and the capacitor polar plate of a wireless charging receiving circuit in electronic equipment; the integral receiving capacitor, a first inductance coil and a rectifying circuit form a receiver; the receiver is in magnetic resonant coupling with a wireless charging emission source to receive electrical energy sent by the wireless charging emission source; power is supplied to the loading of to-be-charged equipment after rectifying by the rectifying circuit.

To stabilize the transmission characteristic of an electric power supply system for vehicle even when the vehicle being charged and powered by it shifts horizontally, a power transmitting antenna, which is arranged on the ground, and a power receiving antenna, which is arranged at the bottom of the vehicle, set up resonances at substantially the same resonant frequency and produce magnetic resonant coupling between them. When the power receiving antenna enters the zone in which the power transmitting antenna is located, power is transmitted to the vehicle. By setting the width of the power receiving antenna as measured in the vehicle's width direction to be larger than the length of the power receiving antenna as measured in the vehicle's traveling direction, the transmission characteristic can be stabilized.

Disclosed herein is a stereoscopic image display apparatus capable of wirelessly transmitting and receiving power. The stereoscopic image display apparatus includes a stereoscopic image display unit and shutter glasses. The stereoscopic image display unit divides stereoscopic images into images for the left eye and images for the right eye and displays the resulting stereoscopic images, generates a signal of opening/closing a right eye shutter and a left eye shutter, and generates a power signal and then wirelessly transmits power in a magnetic resonance coupling manner. The shutter glasses wirelessly receives the power signal from the stereoscopic image display unit in the magnetic resonance coupling manner, and provides the images for the left eye and the images for the right eye by alternatively opening and closing the left eye shutter and the right eye shutter in response to the signal of opening/closing the right eye shutter and the left eye shutter.

The invention discloses a magnetic resonant coupling wireless energy transmission system based on filter design principles in the technical field of design of wireless energy transmission systems; and the magnetic resonant coupling wireless energy transmission system is instructed and designed by applying design principles of an inductive coupling second-order band-pass filter. The system comprises a power supply, an admittance converter, a parallel resonant circuit and a load. The design method uses synthetic design method principles of a filter to effectively terminate the relationship between the transmission power, the transmission efficiency, the transmission distance and the working frequency in the wireless energy transmission system and the values of all electronic elements in a circuit system, and the designed transmission system can work in the state of highest transmission power and transmission efficiency; and at the same time, through designing a certain band width, the wireless energy transmission system is used in a wider frequency range, so that the problem of reduced transmission power and transmission efficiency due to optimal transmission frequency variations caused by system errors is solved better.

The invention discloses a magnetic field balance distribution type wireless power transmission system based on magnetic resonant coupling. An emitting end of the system adopts an array-type resonant coil structure and a feeding mode for simultaneously driving all resonant coils by a single excitation coil, and magnetic resonance between resonant coils of a receiving end and a resonant coil array of the emitting end as well as magnetic fields uniformly distributed at the receiving end are realized. While the transmission efficiency higher than 65% is realized, the axial and transverse receiving ranges of the receiving end are expanded and the stability of wireless power transmission is improved. The emitting end and the receiving end adopt planar structures and can be processed through printed circuit boards, a rectifying and voltage-stabilizing circuit is integrated in a blank area of the circuit board of the receiving end, 5-12 V direct-current voltage can be output, and the size of the receiving end can be reduced to 50*50*1 mm<3>. The wireless power transmission system is suitable for various coil structures such as a rectangular coil structure and a square coil structure, and can be applied to one-to-one and one-to-many wireless power transmission of portable computers, tablet computers, LED illumination equipment, sound boxes, mobile communication terminal and small-sized consumer electronics.

The invention relates to a distributed energy source and an electric vehicle wireless power supply integrated system based on a magnetic resonance coupling technology. The system comprises a distributed energy source power generation system, a resonance magnetic coupling wireless electric energy transmission system and an electric vehicle (EV). The distributed energy source power generation system and the resonance magnetic coupling wireless electric energy transmission system form an organic integrated system by virtue of a form of a direct current micro-grid, and are centralized together in a proper connecting mode by matching with an energy storage system and related electric equipment to meet a charging requirement of the electric vehicle and characteristic control of a renewable energy source, thereby achieving elimination and utilization on the spot of the renewable energy source by the electric vehicle. The invention solves many problems generated by a distributed energy source grid, and avoids a great pressure on the structure and running of a power grid caused by a large amount of electric vehicles which are charged by plugging into the power grid. According to the invention, a resonance magnetic coupling wireless electric energy transmission technology is adopted to supply power to the electric vehicle, and the defects of a conductive charging mode are avoided, which is helpful for promoting popularization of electric vehicles.

The invention provides an 8-shaped coil transcranial magnetic stimulation system based on a magnetic resonant coupling principle. A first stimulation coil and a second stimulation coil of the system are externally tangent to each other. The inner diameter of each of the first stimulation coil and the second stimulation coil is 56mm, and the outer diameter of each of the first stimulation coil and the second stimulation coil is 62mm. A first source coil is internally tangent to the first stimulation coil, and a second source coil is internally tangent to the second stimulation coil. The two internally-tangent points are superposed with the externally-tangent point between the first stimulation coil and the second stimulation coil. The inner diameter of the first source coil and the inner diameter of the second source coil are 30mm, and the outer diameter of the first source coil and the inner diameter of the second source coil are 36mm. The discharging current directions of the middle points of the central connecting lines of the two coil units are consistent, and the middle points are corresponding to the target position simulation points. The 8-shaped coil transcranial magnetic stimulation system is advantageous in that when the system source coil is provided with the current having the same intensity, the stimulation intensity of the affected parts having the same depth in the cranium can be increased; the utilization rate of the energy transmitted from the source coils to the cranium model can be increased by more than three times; when the energy utilization efficiency is increased and the excitation current strength is reduced, the stimulation intensity can be increased, and the stimulation accuracy of the target positions can be increased.

The invention relates to the technical field of intelligent road traffic, in particular to an intelligent highway system based on photovoltaic energy storage and a wireless charging technology and a charging method. The intelligent highway system comprises an electric automobile receiving unit, and further comprises a pavement transmitting unit, wherein the pavement transmitting unit comprises a top tempered glass layer and a bottom foundation layer as well as an LED lighting layer, a solar photoelectric layer and a wireless charging layer which are successively arranged between the tempered glass layer and the foundation layer from top to bottom; the LED lighting layer, the solar photoelectric layer and the wireless charging layer are electrically connected; electric energy is transmitted between the wireless charging layer and the electric automobile receiving unit by resonant magnetic coupling. The intelligent highway system runs safely and reliably. Wireless charging is carried out by the surface of a highway. Compared with a ground facility, the intelligent highway system does not occupy ground space, and therefore, construction and maintenance costs can be reduced. An electric automobile does not require to be stopped when charged, and can be charged during running, and is speedy and convenient to charge, and charging at any time in any places is possible. Solar energy which serves as energy is environmentally friendly.

A system and method for wirelessly controlling a shape memory alloy (SMA) actuator using magnetic resonant coupling (MRC). The SMA actuator is part of a receiver circuit including an actuator coil, where the SMA actuator is configured into a certain shape. The system includes a transmitter circuit having a transmitter coil and a controller, where the transmitter coil receives an AC current that causes the transmitter coil to generate an oscillating magnetic field in resonance with the actuator coil in the receiver circuit and be magnetically coupled thereto. The current induced in the actuator coil creates heat that reconfigures the SMA actuator to provide the actuation.

A system for providing power signals to peripheral devices on a vehicle using magnetic resonance coupling. The system includes a transmitter circuit having a variable current source, a base coil and a variable capacitor, where the current source and the capacitor are tuned to provide a predetermined AC current to the base coil so as to generate an oscillating magnetic field at a predetermined frequency. The system also includes a receiver circuit for each peripheral device, where each receiver circuit includes a receiver coil and a rechargeable power source. When the base coil is tuned to the receiver coil the power source can be recharged through magnetic resonance coupling to power the device. The transmitter circuit can be on the vehicle or can be separate from the vehicle, such as in a charging pad.

The invention discloses a complex dielectric constant measuring device and method based on the wireless energy transmission principle. The complex dielectric constant measuring device comprises a vector network analyzer, a source coil and a load coil, wherein the source coil is connected with the vector network analyzer, the source coil and the load coil are connected in a wireless mode through electromagnetic coupling resonance, and a measured sample is placed at back of the load coil. According to the complex dielectric constant measuring device and method, non-contact measurement on the complex dielectric constant of a small-size object is achieved; 50-ohm impedance matching and the high measurement sensitivity are simultaneously achieved through the large-Q-value magnetic resonance coupling coils; a linear computational formula for measuring the small-size measured sample is obtained through the Rayleigh scattering principle. The complex dielectric constant measuring device is easy and convenient to use and suitable for non-contact measurement on solid and liquid, and has the high flexibility and the high practicability.

The invention relates to a method for quantitatively representing a sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection. The method for quantitatively representing the sandstone reservoir hole throat structure by nuclear magnetic resonance coupling constant-speed mercury injection comprises the steps of selecting a full-size core of a target sandstone reservoir, drilling a small rock sample, and performing nuclear magnetic resonance experiment to obtain a T2 relaxation time duty ratio distribution curve; performing constant-speed mercury injection on the small rock sample to obtain a constant-speed mercury injection hole throat duty ratio distribution curve; coupling maximum relaxation time T<2max> and maximum hole throat radiumr<max> of the same small rock sample to obtain surface relaxation rate Phi of each small rock sample so that the surface relaxation rate Phi is used as the surface relaxation rate Phi of the target sandstone reservoir; and performing calculation to obtain complete effective hole throat radius duty ratio distribution map according to a nuclear magnetic resonance principle. By the method, thecomplete and effective hole throat relaxation time distribution characteristic can be non-destructively detected, the complete and effective hole throat radium duty ratio distribution map of the reservoir sandstone is obtained, and the quantitative representation of the effective hole throat structure distribution of the sandstone reservoir is achieved.