A radio frequency rectifier circuit including a rectifier circuit and a controller circuit is provided. The rectifier circuit receives a radio frequency signal and converts the radio frequency signal into a direct-current voltage serving as an output voltage. The rectifier circuit includes multiple power stages and multiple switch circuits. Each of the switch circuits is coupled between two of the power stages. The controller circuit is coupled to the rectifier circuit. The controller circuit outputs a control signal to control a conduction number of the switch circuits according to a value of the output voltage.

Systems and methods for providing over-the-air power to charging pads. A system may include means for transducing over-the-air energy into electric power, at least one rechargeable battery coupled to the means for transducing, and at least one charging pad coupled to the at least one battery. The system may be positioned at least in part in at least one cavity positioned underneath a user-accessible surface of an apparatus. A method may include the steps of transducing over-the-air energy into electric power, inducing a first direct current from the electric power, transmitting the first direct current to at least one rechargeable battery, and transmitting a second direct current from the at least one rechargeable battery to at least one charging pad. Improvement of spaces used by people in need of charging various electronic devices may be achieved without such facility spaces having to undergo costly structural modifications.

An auxiliary wireless personal area network system installable in a vehicle includes a plurality of line replaceable units each associated with an avionics subsystem and installable in prescribed locations in the aircraft. At least a subset of the line replaceable units are interconnectable over a dedicated subsystem network. A plurality of network node devices are each associated with a respective one of the plurality of line replaceable units. Each of the network node devices has a microcontroller, an onboard power source independent of any aircraft power source, a local interface connectible the corresponding one of the plurality of line replaceable units, and a wireless network interface connectible to a personal area network independent of the dedicated subsystem network for relaying operational data from the line replaceable unit to the network node device.

A WIRT system uses synchronizable PPM waveforms to convey information and power from an ET to a remote, far-field EH. In so doing, the solution presented herein reduces receiver complexity, optimizes power transfer, and meets information transfer requirements. The synchronizable PPM waveform comprises a plurality of pulsed-modulation symbols, each of which comprises one or more pulses position-modulated responsive to the information to be conveyed to the EH. The ET configures at least one pulse in each symbol of said synchronizable PPM waveform according to one or more synchronization constraints to enable symbol synchronization at the EH. The EH converts the RF power of the received synchronizable PPM waveform to a DC voltage, and synchronizes the received PPM waveform to extract the information in the PPM waveform.

An integrated circuit on a chip may include a plurality of capacitors that are connected in series and generate an AC noise signal. A selected bandwidth of the AC noise signal transmits through the series of capacitors as a first AC power signal. Respective rectifiers are positioned for receiving a positive cycle of the first AC power signal and a negative cycle of the first AC power signal. Output terminals are connected to the respective rectifiers and configured for connection to an off chip circuit. The capacitors may be fixed or variable gap capacitors.

Cooperative resource allocation method and apparatus for downlink simultaneous wireless information and power transfer are proposed. A cooperative resource allocation method for downlink simultaneous wireless information and power transfer network, which is implemented through a central processor, according to one example of embodiments, may be configured to include allocating subcarrier for wireless information transfer and power transfer; and allocating power for wireless information transfer with the allocated subcarrier and divided transfer power.

A measurement system includes: a vibration-driven energy harvesting unit that generates electric power from sound, vibration, or displacement; a power supply controller that controls an amount of power consumption of a power supply based on the electric power generated by the vibration-driven energy harvesting unit; a detector that is driven by electric power supplied by the power supply controller and detects an environment state quantity; and a transmitter that is driven by electric power supplied by the power supply controller and transmits information regarding the environment state quantity detected by the detector.

An electrical penetration food thermometer having an elongated probe, a temperature sensor within the probe, an energy converter capable of generating an electrical power from a temperature difference, and a heat conductor thermally conductively connected to the energy converter.

Disclosed are an artificial intelligence algorithm-based wireless power transmitter, wireless power receiver, and wireless power charging system that are capable of high-speed response to environmental changes and that can optimize the power efficiency of a wireless power receiver, estimate a dynamic location from a signal received from the wireless power receiver using artificial intelligence technology, and dynamically transmit wireless power to a prioritized wireless power receiver according to a power state.

A device is disclosed, which includes: a charge portion with a plurality of piezoelectric elements embedded in a tire configured for a vehicle, a capacitor mechanically coupled to the tire and electrically coupled to the plurality of piezoelectric elements; a transmitter coil, mechanically coupled to the tire and electrically coupled to the capacitor through a discharge portion; wherein in response to an external radial pressure on the tire resulting from movement of the vehicle which causes a pressure on the plurality of piezoelectric elements, the plurality of piezoelectric elements produce an electrical charge on the capacitor, and wherein the discharge portion electrically connects the electrical charge on the capacitor to the transmitter coil to send electromagnetic power to the vehicle.