Wireless power transmission system
First Claim
1. A wireless power transmission system, comprising:
- a microwave power transmitter having a control logic circuit and a phased array antenna having a plurality of microwave array emitters for emitting a power transmission signal, the emitters being adaptively-phased by the control logic circuit, the power transmitter further having a receiver operable on a side channel frequency;
a device to be charged having a rectenna and a transmitter operable on the side channel frequency, the device to be charged having a power signal strength reporting circuit automatically communicating the received strength of the power transmission signal to the power transmitter on the side channel; and
means for switching phase and selectively activating individual ones of the microwave array emitters in response to power signal strength reports from the device to be charged in order to adjust the phase of the power transmission signal to maximize efficiency of power transmission from the power transmitter to the device to be charged, while obviating the necessity of information regarding a location of the device to be charged.
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0 Petitions
Accused Products
Abstract
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 onto a device to be charged 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. A communications channel is opened between the wireless power source and the device to be charged. The device to be charged reports to the power source via the channel a received beam signal strength at the rectennas. This information is used by the system to adjust the transmitting phases of the microwave array emitters until a maximum microwave energy is reported by the device to be charged. Backscatter is minimized by physically configuring the microwave array emitters in a substantially non-uniform, non-coplanar manner.
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Citations
13 Claims
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1. A wireless power transmission system, comprising:
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a microwave power transmitter having a control logic circuit and a phased array antenna having a plurality of microwave array emitters for emitting a power transmission signal, the emitters being adaptively-phased by the control logic circuit, the power transmitter further having a receiver operable on a side channel frequency; a device to be charged having a rectenna and a transmitter operable on the side channel frequency, the device to be charged having a power signal strength reporting circuit automatically communicating the received strength of the power transmission signal to the power transmitter on the side channel; and means for switching phase and selectively activating individual ones of the microwave array emitters in response to power signal strength reports from the device to be charged in order to adjust the phase of the power transmission signal to maximize efficiency of power transmission from the power transmitter to the device to be charged, while obviating the necessity of information regarding a location of the device to be charged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless power transmission system, comprising:
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a microwave power transmitter having a control logic circuit and a phased array antenna having a plurality of microwave array emitters for microwave power transmission, the emitters being adaptively-phased by the control logic circuit, the phased array antenna further having signal receiving capability in a same frequency band as the microwave power transmitter;
a device to be charged having a rectenna for receiving and rectifying the microwave power transmission and a calibration transmitter operable on said frequency band; andmeans for switching phase and selectively activating individual ones of the microwave array emitters in response to power signal strength of the calibration transmitter signal from the device to be charged in order to adjust the phase of the array in preparation for maximum efficiency of the microwave power transmission from the power transmitter to the device to be charged, while obviating the necessity of information regarding location of the device to be charged. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification