摘要:
The wireless power transmission is a system for providing wireless charging and/or primary power to electronic/electrical devices via microwave energy. The microwave energy is focused to a location in response to receiving a beacon signal from a beacon device by a power transmitter having one or more adaptively-phased microwave array emitters. Rectennas within the device to be charged receive and rectify the microwave energy and use it for battery charging and/or for primary power.
摘要:
A radio frequency (RF) energy harvesting device including a scalable metamaterial resonator antenna and a rectifying circuit formed on a flexible plastic substrate. The metamaterial resonator antenna includes a metal (e.g., silver) structure that is conformally fixedly disposed (i.e., either printed or deposited/etched) on the flexible substrate and configured to resonate at RF frequencies using primary and secondary antenna segments connected by linking segments such that captured RF signals are generated at two antenna end points that are 180° out-of-phase with each other. The rectifying circuit including additional metal structures that are also printed or otherwise formed on the flexible substrate, and one or more circuit elements that are configured to pass positive voltage pulses from the captured RF signals to an output node. Various metamaterial resonator antenna configurations are disclosed.
摘要:
Disclosed is a wireless power transfer apparatus that includes a case for an electronic device. The case may have an electrically conductive panel portion and side portions defined along sides of the panel portion. The case further have at least one opening formed one of the side portions. A coil configured to couple to an externally generated magnetic field may have first segments that span a width of the panel portion of the case and second segments arranged along the side portions of the case and exposed through the at least one opening.
摘要:
A radio frequency (RF) energy harvesting device (rectenna) includes an antenna structure configured to resonate at RF frequencies, and a rectifying circuit that facilitates harvesting multiband RF signals having low energy levels (i.e., tens of mW and below) by utilizing two Zero Bias Schottky diodes having different forward voltage and peak inverse voltage values. Positive voltage pulses from a captured RF signal generated on a first antenna end point are passed by the first diode to a first internal node where they are summed with a second RF signal generated on the second antenna end point (i.e., after being passed through a capacitor), thereby producing a first intermediate voltage having a substantially higher voltage level. Positive voltage pulses are then passed from the first internal node through the second diode to an output control circuit for conversion into a usable DC output voltage.
摘要:
An energy collection device that increases output power to be collected is provided. Provided is an energy collection device that includes: an antenna unit having a dipole structure, the antenna unit including a first antenna element that is in contact with an industrial product metal portion or a human body and functions as an antenna, and a second antenna element including a conductor, the antenna unit receiving electric field energy of a radio wave and a quasi-electrostatic field existing in space; a rectifier circuit provided with a switching element that rectifies alternating current (AC) energy output from the antenna unit; and a power storage capacitor configured to store charge output from the rectifier circuit, in which the power storage capacitor has a capacitance value of at least 1 µF or more in order to receive power in a low frequency band.
摘要:
A method is provided. The method is for power delivery in a wireless power system including a transmitter and a receiver. The method includes receiving, by the receiver, a focused power transmitted by the transmitter and directly measuring, by the receiver, a radio frequency (RF) power level of the focused power. The method includes determining whether the power level of the focused power exceeds a threshold and performing operations based upon the power level exceeding or not exceeding the threshold.