Phased Array Wireless Power Beam Steering With Moving REV Calibration
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Solution Overview
Problem
In wireless power transmission devices using phased array antennas, phase deviations among element antennas lead to reduced power transmission efficiency, and existing methods for equalizing phase references, such as the REV method, are inaccurate when the measurement antenna is mounted on a moving movable body.
Innovation Solution
A wireless power transmission device with a phased array antenna system that includes phase shifters and amplifiers for each element antenna, a transmission signal generator, a presence direction determiner, a measurement antenna, and a phase controller to accurately adjust and equalize phase references based on real-time data from a moving movable body, ensuring precise phase alignment and efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the REV method is executed using a measurement antenna mounted on a moving movable body, then the phase references can be adjusted in real-time during movement, but the measurement accuracy deteriorates due to movement-induced signal variations
Solution Approach 1:
The patent applies preliminary action by measuring the phase references at multiple predetermined phase shifter settings before executing the REV method, and storing these measurements for later correction. This allows the system to compensate for movement-induced errors using pre-acquired data, thereby maintaining measurement accuracy even when the movable body is in motion.
Solution Approach 2:
The patent implements feedback by using the measured phase reference information to correct and adjust the phase shifter settings during the REV method execution. The system continuously monitors the actual phase references and adjusts the phase shifters accordingly, creating a closed-loop control system that maintains accuracy despite movement.
2Productivity
If phase shifters are adjusted dynamically during REV method execution to track a moving movable body, then the power transmission efficiency is maintained, but the phase reference equalization accuracy deteriorates
Solution Approach 1:
The patent measures and stores phase reference information at multiple phase shifter settings before executing the REV method. These preliminary measurements are used to calculate correction values that compensate for dynamic conditions, allowing accurate phase reference equalization even when phase shifters are adjusted during operation to track a moving movable body.
Solution Approach 2:
The patent segments the phase adjustment process into discrete predetermined settings. By measuring phase references at each segment (phase shifter setting) separately and storing these measurements, the system can process and correct phase references for each segment individually, maintaining accuracy while enabling dynamic tracking.
3Speed
If multiple phase shifters are adjusted simultaneously during REV method execution, then the tracking speed of the movable body is improved, but the measurement accuracy for phase reference equalization deteriorates
Solution Approach 1:
The patent segments the phase shifter adjustment into multiple predetermined settings and measures phase references at each setting separately. This segmentation allows the system to handle multiple phase shifters in a structured manner, measuring and storing data for each setting before proceeding to the next, thereby maintaining measurement accuracy while achieving fast tracking through efficient parallel processing of segmented data.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables more accurate execution of the REV method for moving movable bodies, improving power transmission efficiency by ensuring that phase references are consistently and accurately adjusted, even when the measurement antenna is in motion.
Implementation Method 1
the phase of a radio wave radiated by each element antenna included in the power transmission antenna is controlled to form a power transmission beam in the direction in which a power reception device included in the movable body is present
Implementation Method 2
A wireless power transmission system is proposed which transmits power wirelessly to a movable body such as a drone using a phased array antenna as a power transmission antenna
Implementation Method 3
measurement is performed by the REV method based on the electric power received by a movable body hovering in the air
Data Source
AI summary
A power transmission device includes: a power transmission antenna including element antennas to radiate a radio wave and element modules each provided for a predetermine number of element antennas and including a phase shifter to change a phase of a transmission signal radiated as the radio wave and an amplifier to amplify the transmission signal; and an REV method phase controller to change the phase of the transmission signal by a phase shift amount obtained by adding an operation phase shift amount for executing the REV method and a direction change phase shift amount for changing a transmission direction, for an operating phase shifter being part of the phase shifters, such that operation of changing the phase shift amount of the operating phase shifters is repeated while changing the operating phase shifters in a state in which at least some element antennas radiate the radio wave.