111 results about "Rf energy harvesting" patented technology

A method and apparatus is disclosed herein for real-time wireless power transfer control. In one embodiment, a system comprises: an RF-energy harvesting sensor tag operable to generate a first backscatter signal and at least one base station operable to deliver RF power to the sensor tag by emitting a first waveform comprising a plurality of subcarriers, wherein the first backscatter signal is generated by the sensor tag by modulated scattering of the first waveform as incident upon the sensor tag, and further wherein the at least one base station subsequently emits a second waveform determined at least in part by a closed-loop feedback control algorithm responsive to measurements of the first backscatter signal.

A device for brain stimulation using radio frequency harvesting is disclosed. The device includes a circuit implantable under a scalp of a patient, the circuit comprising a radio frequency harvesting power circuit and a stimulation circuit, and a plurality of electrodes coupled to the circuit, the plurality of electrodes providing brain stimulation to targeted areas of the brain. The electrodes may provide stimulation to targeted areas of the brain including deep brain stimulation for the treatment of Parkinson's disease and cortical stimulation for the treatment of stroke victims.

A releasable security tag for attachment to an article of merchandise is disclosed. Features of the security tag include: a locking mechanism with a release for attaching the tag to the article of merchandise; an EAS resonant circuit or an RFID circuit for responding to a first RF signal at a predetermined frequency corresponding to the resonant circuit or to the RFID circuit; an ambient RF energy harvesting circuit; a release signal detection circuit coupled to and powered by the ambient RF energy harvesting circuit and an electro-mechanical actuator electrically coupled to the release signal detection circuit. The electro-mechanical actuator releases the locking mechanism whenever the release signal detection circuit receives a release signal.

The invention belongs to the technical field of wireless communications, and relates to a signal receiving method for a backscatter communication system. The signal receiving method provided by the invention is used for a traditional system with a communication system and an environment backscatter communication system coexisted, and detecting signals sent by the two systems at a joint receiver. A signal transmitted to the joint receiver by a label is modulated by taking a signal from a radio frequency source as a carrier wave; the label comprises one backscatter antenna; the antenna is connected with a load impedance switch and a radio frequency energy collection module; and the radio frequency energy collection module can collect energy from environmental signals. In order to transmit information bits to a reader through backscatter modulation, the label switches an antenna impedance switch, so as to change the amplitude and/or phase of backscattered signals to modulate received carrier signals, and finally, the backscattered signals are received and decoded by the joint receiver.

The invention discloses an intelligent crop detection system, which includes a plurality of wireless rechargeable detection nodes, a programmable UAV platform and a radio frequency transmitter; the detection nodes are deployed in the soil in the area to be detected in the farm, and the crops in each area of ​​the farm are detected by sensors The growth environment conditions; the staff downloads the waypoint files for the UAV platform through the ground station according to the GPS coordinates of the nodes, and the UAV platform automatically plans the flight trajectory and adjusts the flight status in real time according to the content of the waypoint files; the detection nodes are collected and placed in the unmanned The radio frequency energy sent by the radio frequency transmitter on the machine platform is used to supply power for the node itself; the invention combines the new drone technology and the wireless charging technology based on radio frequency energy collection, which can quickly and effectively detect the environmental information of crops in different locations of the farm, It provides scientific guidance for agricultural production on large farms and is applicable to a variety of crop growth environments.

The invention belongs to the technical field of wireless communication, and discloses a cooperative transmission method in a radio frequency energy collection relay network. A source node, a destination node and a relay node are at least contained, wherein the source node and the destination node have a stable power supply; the relay node is an energy limited node; when the source node broadcasts a signal, radio frequency signal energy is collected and is converted into electric energy to be stored in a battery; and in an information transmission process, the destination node selects whether the cooperation of the relay node is needed according to a real-time channel state, and the relay node determines whether to cooperate the information transmission according to an own energy state and a channel state. According to the cooperative transmission method provided by the invention, a network transmission mode is reasonably selected from three proposed network transmission modes to use the collected energy by the relay node more effectively, so that the network transmission reliability is greatly improved; and meanwhile optimal relay node transmitting power is provided, so that the network transmission reliability can be further improved.

The disclosure relates to a radio frequency energy collecting device and a mobile terminal for recovering the energy reflected at an antenna end. The radio frequency energy collecting device includes a power amplifier, an antenna, and an antenna switch module disposed between the power amplifier and the antenna. The radio frequency energy collecting device further comprises a coupler module disposed between the antenna switch module and the antenna for realizing power distribution; and a radio frequency energy collecting module disposed between the coupler module and a load module for receiving the energy coupling output from the coupler module and storing electrical energy to charge the load module. The radio frequency energy collecting device and the mobile terminal have the advantages of reducing the influence on a received signal, reducing the battery energy consumption, improving the battery life, and prolonging the standby time of the mobile terminal.

The invention discloses a greedy energy source minimization arrangement method of an RF (Radio Frequency)-energy harvesting wireless sensor network. From an initial state that the wireless sensor network is not provided with an RF-energy source, the following two parts of operation are repeatedly executed: increasing and deploying a new energy source, and improving the position of the energy source. The newly added energy source is put on a position which effectively improves node energy capture power. The operation of improving the energy source position is to iteratively improve the position of the traditional existing energy source to obtain the optimal deployment of the existing energy source. After the operation of improving the energy source position is finished, the energy capture power of each node is calculated, the phenomenon that the energy capture powers of all nodes meet demands means that the arrangement of the current energy source meets demands, and the arrangement method is finished. The greedy energy source minimization arrangement method of the RF-energy harvesting wireless sensor network can be effectively suitable for a situation that node energy capture power demands in a network are different, and is low in cost.

The invention discloses a radio frequency energy collecting device for the power supply of a wireless sensing node. The radio frequency energy collecting device includes a broadband receiving antenna for receiving radio frequency signals, an impedance matching network which is located between the broadband receiving antenna and a radio frequency-to-direct current conversion circuit, the radio frequency-to-direct current conversion circuit which is connected with the output end of the impedance matching network and adopts a rectifier to convert radio frequency energy which has been subjected to impedance matching into direct current voltage, a voltage monitoring module which is located between the radio frequency-to-direct current conversion circuit and a power management module and is used for adjusting voltage charged to a circuit and adjusting voltage on charge storage devices, the charge storage devices which are located between the radio frequency-to-direct current conversion circuit and the voltage monitoring module, between the voltage monitoring module and the power management module, as well as between the power management module and a powered wireless sensing node, and the power management module which is located between the voltage monitoring module and the wireless sensing node, wherein the power management module is connected with the radio frequency-to-direct current conversion circuit, so that a feedback loop can be formed.

The invention belongs to the field of wireless physical layers, discloses a wireless energy-carrying NOMA cooperative network power optimization method, and mainly solves the problem of insufficient energy supply of secondary user nodes in an existing NOMA cooperative cognitive radio network. The implementation scheme comprises the following steps: firstly, constructing a NOMA (Non-Orthogonal Multiple Access) cooperative network model based on a radio frequency energy collection technology, and simultaneously receiving signals and radio frequency energy at a secondary user receiver by adoptinga power division architecture; a. An improved genetic algorithm is designed to optimize the power distribution factor and the time slot distribution factor of the model so as to maximize the throughput of the secondary user system. According to the invention, the optimal power distribution factor and time slot distribution factor are obtained, the improvement of the system spectrum efficiency andthe improvement of the energy efficiency of the secondary user system are realized, the service life of the secondary user node is prolonged, and the transmission performance of the whole system is improved.

The invention discloses a radio frequency energy collection system and a control method, wherein the radio frequency energy collection system comprises a radio frequency antenna, a control circuit, amatching booster network, an RF-DC rectifier, self-starting circuit, hysteresis voltage comparator, VDD-terminal energy storage unit, VL-terminal energy storage unit, switch SL, voltage detection circuit, VST-terminal backup energy storage unit, first energy conversion circuit, second energy conversion circuit, LDO voltage stabilization circuit, reference current source and reference voltage generation circuit. The invention improves the structure of the existing circuit, optimizes the performance and innovates the structure of each circuit module, improves the sensitivity of the whole collection system, and can manage the stored energy at the same time. In addition, the invention has the characteristics of low power consumption, complete automation, low voltage ripple and the like.

The invention discloses a radio frequency electromagnetic wave energy powered clock device. The device is integrated on a circular double-layer PCB dielectric plate, the top layer of the PCB dielectric plate is depicted as a clock pattern; the bottom layer of the PCB dielectric plate comprises a radio frequency energy collection antenna, a radio frequency energy collection circuit, an energy storage capacitor and a clock working circuit. The radio frequency energy collection antenna is a fractal antenna with coplanar waveguide feed, the antenna patch style adopts a fractal structure, the fractal structure and the coplanar waveguide feed can increase the bandwidth of the antenna, so that the antenna can collect the radio frequency energy of Wi-Fi and mobile phone 2G, 3G, 4G signals in the environment. The radio frequency energy collection circuit comprises matching, rectifying and filtering circuits, wherein the energy storage capacitor is a high-quality super capacitor. The radio frequency electromagnetic wave energy powered clock device can collect the electromagnetic wave energy in the surrounding environment, and can also realize rapid wireless charging through the independent emission source or the mobile phone, the storage energy is applied to the clock working circuit, so that the clock device works normally.

A rectenna includes (a) a multi-band multi-channel (MBMC) matching network, and/or (b) an adaptively reconfigurable rectifier or a breakdown-protected rectifier. An MBMC matching network includes a plurality of T-shaped transmission line matching structures coupled in series. An adaptively reconfigurable rectifier circuit includes a low input power rectifying portion, a high input power rectifying portion, and a set of transistors configured for selectively and automatically transitioning the adaptively reconfigurable rectifier between a low input power operating configuration and a high input RF power operating configuration, in a manner correlated with input RF power level. A breakdown-protected rectifier includes a transistor-protected diode structure having a diode coupled to a transistor in a manner that protects the diode from direct exposure to negative voltages that would ordinarily cause the diode to break down in the absence of the transistor.

The invention relates to wearable passive RFID equipment based on a radio frequency energy collecting device so that the readable distance of the wearable passive RFID equipment can be increased. The equipment comprises a base body and an electronic tag attached to the base body, the periphery of the base body is covered by a waterproof film, the waterproof film employs a flexible insulating material, the electronic tag employs a passive type and comprises a RFID communication antenna, a RFID chip circuit and a RFID chip, the RFID communication antenna is used for receiving and sending radio frequency communication signals, the RFID chip circuit is used for performing filtering, modulation and demodulation on the RFID radio frequency communication signals and providing energy required by basic communication for the RFID chip, the RFID chip is used for responding to the received radio frequency communication signals, the electronic tag is connected with the energy collecting device, and the energy collecting device comprises an energy collection antenna, an energy collection circuit and an energy storage element connected in sequence.

The invention discloses a wireless temperature sensing system capable of collecting radio frequency energy and an energy control method. The wireless temperature sensing system capable of collecting the radio frequency energy comprises a radio frequency emitting device, a central server and a plurality of temperature sensors. The radio frequency emitting device comprises a power control module and a radio frequency emitter, wherein the radio frequency emitter is connected with a power source through the power control module. The power control module is connected with the central server. The radio frequency emitting device transmits energy to the temperature sensors in a radio frequency mode. The central server judges the energy collection condition by the temperature sensors according to received data. When the energy collected by the temperature sensors is insufficient, the emission power of the radio frequency emitter is increased through the power control module, and normal work of the temperature sensors is maintained. When the power of the radio frequency emitter reaches the limit value, the radio frequency emitter reaches the Q state to operate, and data collected for multiple times are sent for one time. The wireless temperature sensing system capable of collecting the radio frequency energy has the certain self-adjusting capacity, can maintain the work state to the greatest extent, and is suitable for the fields, such as the electric power field, needing temperature measurement.

The invention relates to the technical field of sensors, in particular to a passive sensor, a passive sensor system and a working method. The passive sensor comprises an antenna module, a first radiofrequency switch array, an impedance matching network, a second radio frequency switch array, a data collection module, an energy collection module, a data transmitting module, an energy storage unit,a singlechip, a protection circuit module and a sensing module. The passive sensor system comprises the passive sensor and a user terminal, and the user terminal is used for sending out a radio frequency signal and performing data communication with the passive sensor. The passive sensor provided by the invention has the advantages that the sensor can autonomously collect radio frequency energy from an environment or a specific radio frequency energy source by virtue of the radio frequency energy collection unit arranged in the sensor, a wired charging module is not required, 'wireless charging' of a human body sensor is realized, steps of disassembling a battery and charging again in the traditional human body sensor are eliminated, and security of the human body sensor is greatly improved.

The invention relates to a radio frequency energy collection-based unmanned aerial vehicle assisted edge computing resource allocation method, and the method is characterized by comprising the following steps: S1, constructing a radio frequency energy collection MEC system network structure; S2, calculating total energy collected by a user from a remote environment radio frequency source; S3, acquiring transmission time delay required for unloading the calculation task to the unmanned aerial vehicle or the base station; S4, calculating the energy consumption of the user task unloaded to the unmanned aerial vehicle or the base station; S5, obtaining calculation time delay required for executing a system user calculation task; S6, calculating the energy consumption of a user calculation taskof the execution system; S7, constructing preset constraints of energy consumption, computing resources, subcarrier proportionality coefficients and transmitting power; S8, according to preset constraints, constructing an optimization model for minimizing system energy consumption; S9, solving an optimal distribution result of the system by adopting a method of combining a genetic algorithm and nonlinear programming, and obtaining an energy consumption value of the system.