700 results about "Wireless power transfer" patented technology

The invention discloses a wireless power transmission coil optimization method and a related system, which can realize automation of coil structure parameters and multi-target global optimization by acquiring a coil geometric parameter space, constructing a comprehensive optimization function and performing iterative search in the coil geometric parameter space. The problems that in traditional design, the number of simulation iterations is large, design efficiency is low, local optimum is prone to occurring, and multiple performance indexes are difficult to balance are effectively solved, coil design efficiency and precision are remarkably improved, and dependence on artificial experience is reduced. Therefore, the number of manual intervention and simulation is remarkably reduced, the coil design efficiency is improved, and the prototype development period of the WPT system is shortened. Besides, iterative search is carried out in the parameter space, so that the whole design space can be effectively explored, a locally optimal solution trap can be jumped out, and a globally optimal or approximately globally optimal coil structure parameter combination can be obtained more possibly.

A device for transmission of wireless power according to an embodiment of the present specification comprises: a power conversion circuit for transmitting the wireless power to a wireless power receiving device; and a communication / control circuit for communicating with the wireless power receiving device and controlling the wireless power, wherein the communication / control circuit transmits a response to a reception data packet received from the wireless power receiving device or a transmission data packet transmitted to the wireless power receiving device on the basis of a timeout period, and the timeout period is changed according to a communication speed between the communication / control circuit and the wireless power receiving device.

A method for operating a wireless transmission system includes (i) receiving, as input, direct current (DC) power from a power and data connector that comprises a power input and a bi-directional data connector, (ii) generating a driving signal for driving an antenna of the wireless power transmission system, (iii) generating alternating current (AC) wireless signals based on the input DC power and the driving signal, (iv) propagate AC wireless power signals that are based on the AC wireless signals via the antenna, (v) couple with a wireless receiver system via the AC wireless power signals, (vi) receiving data associated with a peripheral device by decoding in-band data signals from the AC wireless power signals that are encoded by the wireless receiver system, and (vii) providing the data associated with the peripheral device to a client device operatively associated with the wireless transmission system, via the bi-directional data connector.

A wireless charger device can support multiple different receiver devices having different wireless charging specifications. The wireless charger device can house two wireless power transmitter coils having different dimensions and arranged coaxially with each other. A first coil can have a size and shape compatible with a portable device such as a smart phone while the second coil can have a size and shape compatible with a smaller device such as a smart watch. The first coil and the second coil can deliver power through the same charging surface, or the first coil can deliver power through a first charging surface while the second coil can deliver power through a second charging surface opposite the first charging surface.

A power transmitter for wireless power transfer includes a control and communications unit, a vehicular power input regulator, an inverter circuit, at least one coil, a shielding, a housing, and a removable front plate. The housing is configured to house, at least in part, one or more of the control and communications unit, the invertor circuit, the at least one coil, the shielding, or combinations thereof. The removable front plate is configured to mechanically connect to the housing, the removable front plate including at least one magnet, the at least one magnet configured to attract a receiver magnet when a power receiver is proximate to the removable front plate.

A stationary induction charging device configured to inductively interact with a mobile induction charging device of a motor vehicle during a charging operation for wireless power transmission includes a positioning device configured to generate a positioning signal for positioning the mobile induction charging device to the stationary induction charging device. The stationary induction charging device further includes an activation interface configured to at least partially activate or deactivate the positioning device upon receiving a corresponding signal from a triggering device.

A wireless power transfer and docking station and methods are provided for wirelessly charging or powering a portable device and automatically connecting to external peripheral devices. The station comprises at least one wireless-power transmitter for transmitting power and identification-related information, and at least one wireless-power receiver, connected to the portable device, for exchanging the power and the identification-related information to the portable device. The methods comprise pairing the at least one wireless-power transmitter with the at least one wireless-power receiver when the portable device is placed in a charging zone of the at least one wireless-power transmitter, exchanging the identification-related information for automatically and wirelessly connecting to the external peripheral devices, and attempting connecting to the external peripheral devices.

A waveguide to transmission line coupler is provided. The waveguide can be capable of guiding electromagnetic energy and can have a plurality of coupling sets along the waveguide. The coupling set can include a non-resonant coupling aperture capable of coupling said electromagnetic energy from the waveguide to at least one output transmission line and a tuning element in the waveguide proximate to said non-resonant coupling aperture thereto, capable of tuning out residual shunt susceptance corresponding to the electromagnetic energy coupled by said non-resonant coupling aperture.

This disclosure provides an X-ray imaging device and its power distribution unit and wireless power transmission device. The power distribution unit includes: a first rectifier circuit, a charging circuit, an energy storage module, and a first inverter circuit; the input terminals of both the first rectifier circuit and the charging circuit are connected to the external power grid; the output terminal of the first rectifier circuit is connected to the input terminal of the first inverter circuit, and the output terminal of the first inverter circuit is connected to the wireless power transmission device of the X-ray imaging device; the output terminal of the charging circuit is connected to one end of the energy storage module, and the other end of the energy storage module is connected to the input terminal of the first inverter circuit. In this disclosure, the power supply from the power grid and the power supply from the energy storage module are in parallel, which can reduce the imaging device's demand on the power grid capacity. Since the charging circuit only participates in the charging process of the energy storage module and does not participate in the discharging process of the energy storage module, it can realize simultaneous charging and discharging of the energy storage module, and there are no excessive requirements on the power level of the charging circuit, which can reduce the cost of the charging circuit.

A wireless transmission system includes a transmitter antenna, a sensor, a demodulation circuit, and a transmitter controller. The sensor is configured to detect electrical information associated with AC wireless signals, the electrical information including, at least, a voltage of the AC wireless signals. The demodulation circuit is configured to receive the electrical information from the at least one sensor, detect a change in the electrical information, determine if the change in the electrical information meets or exceeds one of a rise threshold or a fall threshold, if the change exceeds one of the rise threshold or the fall threshold, generate an alert, and output a plurality of data alerts. The transmitter controller is configured to receive the plurality of data alerts from the demodulation circuit, and decode the plurality of data alerts into the wireless data signals.

A power transmitter for wireless power transfer includes a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, provide a power request to an external power supply, determine if a power signal at the coil is compliant with the power request, and, if the power signal at the coil is compliant with the power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The present disclosure relates to an NFC device configured for wireless power transfer, the NFC device comprising an antenna, a frontend circuit coupled to the antenna, a microcontroller coupled to the frontend circuit, the microcontroller comprising an analog-to-digital converter. The analog-to-digital converter is configured to receive an analog amplitude and / or phase signal from the frontend circuit, and to convert the analog signal into a digital signal. The microcontroller is configured to process the digital signal in order to detect a variation in the amplitude and / or phase of the analog signal, so as to detect a change of impedance within the field of the NFC device.

A charging device may be configured for installation in an electric vehicle for charging a traction battery of the electric vehicle. The charging device may include a wireless power transfer (WPT) unit, an on-board charging (OBC) unit, a rectifier unit configured to convert an alternating current into a direct current, and / or an output configured to connect to the traction battery of the electric vehicle. The rectifier unit may include three rectifier branches of rectifier switching elements. A first rectifier branch and a second rectifier branch may be connected to the OBC unit and may form a full-bridge rectifier configured to rectify an alternating current supplied via the OBC unit. The second rectifier branch and the third rectifier branch may be connected to the WPT unit and may form a full-bridge rectifier configured to rectify an alternating current supplied via the WPT unit.

The invention discloses an omnidirectional wireless electric energy transmission device, and belongs to the technical field of wireless electric energy transmission. The device comprises a regular octahedron framework and a transmitting coil which is continuously and unidirectionally wound along the edge of the regular octahedron framework, and the winding directions of adjacent triangular frameworks are opposite so as to generate an enhanced magnetic field which is matched with a first resonance compensation network and a high-frequency power supply system to work. A receiving end adopts three groups of coil units which are orthogonally arranged in the same plane and are mutually isolated to form a receiving coil, and each group is connected with an independent second resonance compensation network to form a resonance rectification branch. According to the structure, an omnidirectional uniform magnetic field is generated through unique regular octahedron coil arrangement, so that receiving equipment can be efficiently charged at any angle and position in a large range, and the structure has high tolerance to rotation and offset. The planar orthogonal receiving coil can capture more magnetic flux in a three-dimensional space, the transmission efficiency is improved, cross coupling is effectively restrained, and meanwhile the planar orthogonal receiving coil can be conveniently integrated in a mobile phone, a computer and other devices through the flat design.

The embodiment of the invention discloses a control method and device of a wireless power transmission system, equipment and a storage medium, the wireless power transmission system at least comprises a transmitting end and a receiving end which are in communication connection, and the method is applied to the receiving end. The method comprises the steps of obtaining an output voltage of a receiving end, an output voltage reference value and an estimated value of a first pulse density instruction of a transmitting end, wherein the output voltage is used for reflecting voltages at two ends of a to-be-powered load; determining an internal control quantity by using the output voltage, the output voltage reference value and a preset proportional-integral controller; determining a second pulse density instruction of the receiving end according to the estimated value and the internal control quantity; and sending the second pulse density instruction to the transmitting end. The power efficiency decoupling control method is realized through the method, the pulse density of the transmitting end can follow the receiving end, the interference of maximum efficiency tracking on voltage control is avoided, and the speed of the MEPT is improved.

The invention discloses an underwater wireless power transmission system parameter identification method based on machine learning, which comprises the following steps: constructing a data set through finite element simulation, and obtaining original input parameters including geometry, electromagnetism and position offset and corresponding key output parameters; feature engineering is executed, and derived features with physical significance are extracted; performing standardized preprocessing on the data; for each key output parameter, independently training an XGBoost regression model; carrying out five-fold cross validation on the training set by adopting a Bayesian optimization algorithm, and carrying out independent hyper-parameter optimization on each XGBoost model; and carrying out interpretability analysis on the trained agent model by utilizing SHAP analysis, quantifying the contribution degree of each input feature to a prediction result, and providing physical insight. According to the method, high-precision prediction of the electromagnetic parameters under the complex working condition is achieved, complex electromagnetic field calculation is avoided, the system design efficiency is remarkably improved, and the efficiency and interpretability of intelligent optimization design of the UWPT system are remarkably improved.

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

This disclosure provides an X-ray imaging device and a wireless power transmission device with electromagnetic shielding. The wireless power transmission device includes: a first annular structure, on which a first frame is fixed, and a first winding is wound; a second annular structure, on which a second frame is fixed, and a second winding is wound; wherein the second annular structure is rotatable relative to the first annular structure; and a metal shielding assembly disposed relative to the first winding and / or the second winding, the metal shielding assembly being used to generate a reverse magnetic field based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device. This disclosure utilizes the reverse magnetic field generated by the metal shielding assembly based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device, thereby reducing magnetic field leakage and thus reducing electromagnetic interference of the wireless power transmission device.

The present invention relates to the technical field of wireless power transfer (WPT). Specifically disclosed is a WPT system for realizing constant current and constant voltage output on the basis of a variable-structure hybrid topology. A variable-structure hybrid topology is designed, wherein input ends of CLC-S-type and S-CLC-type topologies are connected in series, and output ends of the CLC-S-type and S-CLC-type topologies are connected in parallel to form a front-stage circuit which is mainly used for improving the system misalignment tolerance; on this basis, a variable-structure T-type compensation topology is incorporated at an output end to form a rear-stage T-type circuit, and constant-current / constant-voltage switching is achieved by changing the structure of the rear-stage T-type circuit. Moreover, in order to improve the system misalignment tolerance, a system compensation parameter is designed. Experiments have verified that the WPT system for realizing constant current and constant voltage output on the basis of a variable-structure hybrid topology provided by the present invention can realize constant-current / constant-voltage switching, and has high misalignment tolerance in both a constant voltage mode and a constant current mode.

Estimating friendly metal losses (PFM) associated with power transfer from a wireless power transmitter (PTx) to a wireless power receiver (PRx) can include determining PFM based on one or more circuit parameters; subtracting an effect of one or more voltage or current measurements from the determined PFM to derive a modified PFM; and determining ecosystem scaling parameters based on the modified PFM. The ecosystem scaling parameters can include scale factors based on operation of the PTx with a reference PRx; operation of the PRx with a reference PTx; and / or operation of the reference PRx with the reference PTx. Estimating PFM can further include adding the effect of at least one of the one or more voltage or current measurements from the determined PFM to derive one or more loss coefficients; and performing foreign object detection based on a PFM model including the derived loss coefficients.

A power transmitter for wireless power transfer includes a verification load, a control and communications unit, an inverter circuit, a coil, and a shielding. The control and communications unit is configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver, provide a power request to an external power supply, determine if a power signal at the verification load is compliant with the power request, and, if the power signal at the verification load is compliant with the power request, continue to operate for wireless power transmission. The coil is configured to transmit the power signal to a power receiver. The shielding comprises a ferrite core.

A wireless power transmission system includes a transmitter antenna, a transmission controller, an amplifier, and a variable resistor. The transmission controller is configured to (i) provide a driving signal for driving the transmitter antenna based on an operating frequency for the wireless power transfer system and (ii) perform one or more of encoding the wireless data signals, decoding the wireless data signals, receiving the wireless data signals, or transmitting the wireless data signals. The variable resistor is in electrical connection with the transmitter antenna and configured to alter a quality factor (Q) of the transmitter antenna, wherein alterations in the Q by the variable resistor change an operating mode of the wireless power transmission system.

Provided is a wireless power transmitting system and device, the wireless power transmitting device including: a signal generator configured to generate an initial signal; a controller configured to output an amplitude control signal and a phase control signal; a phase modulator configured to generate a phase-modulated signal by modulating a phase of the initial signal based on the phase control signal; a power amplifier configured to generate a power signal by amplifying the phase-modulated signal; a voltage converter configured to control a magnitude of a power voltage of the power amplifier based on the amplitude control signal; and an antenna configured to externally output the power signal.

This application provides a wireless power transfer system with dual voltage level output and its switching method to solve the problem that existing WPT systems cannot meet the charging needs of different voltage levels. It includes a transmitting unit and a receiving unit. The transmitting unit includes a DC power supply, a high-frequency inverter, and a transmitting coil circuit connected in sequence. The transmitting coil circuit is connected in sequence to a first transmitting coil, a first primary-side resonant capacitor, a control switch, a second primary-side resonant capacitor, and a second transmitting coil. The other ends of both the first and second transmitting coils are connected to the output terminal of the high-frequency inverter. A switching circuit is also provided between the first and second transmitting coils to cooperate with the control switch to enable the system to switch between dual voltage levels. This application achieves the switching between different voltage levels through the control of the control switch and the switching circuit, thus meeting the charging needs of different voltage levels.

The invention provides a coil array and a wireless power transmission system, the coil array comprises at least one coil structure, the coil structure comprises three coil units, and the three coil units respectively form three sides of the same triangle so as to form the coil structure; wherein each coil unit in the same coil structure is configured to allow the current flowing through the coil unit to form a current loop, and the coil units in the same coil structure are the same or different; moreover, each coil unit in the same coil structure is configured to be excited by an independent amplitude-modulated wave and obtain a driving current, so that the coil array is allowed to be configured to obtain optimal magnetic field distribution and magnetic field polarization according to different phases and current directions and form a three-dimensional rotating magnetic field.

Embodiments of the present disclosure relate to dynamic adjustment for wireless charging coupling coefficients. A wireless charging system may include a first coil and a charging configuration controller. The charging configuration controller may include circuitry configured to cause a parameter adjustment process to be performed. The parameter adjustment process may include determining a wireless charging parameter associated with wireless power transfer between a first coil and a second coil, where the first coil is wirelessly coupled with the second coil, detecting that the wireless charging parameter is outside a predetermined range of values; and in response to the detection, causing the vehicle to adjust a position of the second coil relative to the first coil such that wireless power transfer between the second coil and the first coil occurs with the second coil in the adjusted position.

An electronic device configured to transfer wireless power to an additional electronic device can include a wireless power transfer coil; an inverter configured to receive switching signals based on a dithered clock signal and output corresponding alternating current signals to the wireless power transfer coil; and control circuitry that generates the dithered clock signal. The dithered clock signal can have a plurality of frequency steps. A duty cycle of the switching signals can be different between at least two different frequency steps of the plurality of frequency steps to compensate for different gains of the wireless power transfer from the electronic device to the additional electronic device at the at least two different frequency steps.

A multiphase wireless power transfer pad has at least a first coil and a second coil and permeable material which includes a region of reduced magnetic permeability configured to minimise coupling between the first and second coils.

The invention provides an implantable medical device and a positioning method of a wireless energy transmission coil thereof, and the method comprises the steps: re-exciting a magnetic field through a transmitting coil in a process that the spatial position of the transmitting coil is adjusted; acquiring an induced electrical signal at the receiving coil corresponding to the process of re-exciting the magnetic field; and extracting slope characteristics from the acquired induction electric signals, and judging whether the receiving coil is aligned with the transmitting coil or not according to the slope characteristics. Sensors (such as a magnetoresistive sensor and an electronic compass) hardware do not need to be additionally arranged, the size of the implantation end is small, trauma to a patient in the implantation process is reduced, the coil alignment state is judged by extracting slope characteristics instead of judging the coil alignment state based on signal intensity (such as an absolute value of induced voltage), and the accuracy of the coil alignment state is improved. The judgment method based on the slope characteristics is higher in accuracy and better in anti-interference performance.