Fisheye Marker Distance Estimation for Wireless Power Phase Alignment
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Solution Overview
Problem
In wireless power transmission systems, especially when the wireless power receiver is mounted on an airplane, the phase shift of power signals received from multiple antenna elements becomes significant at short distances, leading to reduced power reception efficiency due to varying transmission distances between the antennas and the receiver.
Innovation Solution
A distance estimation device using a fisheye lens and image processing to determine the distance between the power receiver and the feed device, allowing for real-time adjustment of phase shifts in transmission power signals to match the receiver's phase, thereby enhancing power reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power is transmitted from multiple antenna elements to the same target at short distance, then power transmission capability is improved, but phase shift increases causing reduced power reception efficiency
Solution Approach 1:
The patent implements dynamic phase adjustment by continuously measuring the distance to the power receiver and adjusting the phase of transmission power signals in real-time. The controller modifies phase values based on measured distance changes, enabling the system to adapt to varying distances and maintain optimal power reception efficiency despite the phase shift issues that arise at short transmission distances
Solution Approach 2:
The patent employs a feedback mechanism where the distance measuring unit continuously monitors the distance between antenna elements and the power receiver, and this distance information is fed back to the controller. The controller uses this feedback to dynamically adjust phase values, creating a closed-loop control system that maintains optimal power transmission by compensating for phase shifts based on real-time distance measurements
2Productivity
If distance between feed device and power receiver is reduced to several meters, then power transmission efficiency is improved, but distance difference between multiple antenna elements becomes significant causing increased phase shift
Solution Approach 1:
The system dynamically adjusts phase values based on real-time distance measurements. When the distance to the power receiver changes, the controller modifies the phase of transmission signals to compensate for the varying path lengths from different antenna elements, maintaining consistent power transmission efficiency across short distances where distance differences become significant
Solution Approach 2:
The patent changes the phase parameter of transmission power signals based on measured distance values. By adjusting the phase parameter in response to distance variations, the system compensates for the significant distance differences between multiple antenna elements and the power receiver at short transmission distances, maintaining optimal power transmission efficiency
3Reliability
If phase adjustment is implemented to compensate for distance differences, then power reception efficiency is improved, but device complexity increases due to additional measurement and control components
Solution Approach 1:
The camera unit serves multiple functions: it captures images for distance measurement and can potentially track the position of the power receiver. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while still enabling the phase adjustment functionality that improves power reception efficiency
Solution Approach 2:
The patent introduces a marker as an intermediary element that facilitates distance measurement. The marker attached to or near the power receiver provides a visual reference that the camera can detect, enabling indirect distance measurement without requiring complex direct measurement devices. This intermediary approach maintains relatively simple system structure while enabling the phase compensation needed for improved power reception efficiency
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
Enables real-time estimation and adjustment of phase shifts, improving power transmission efficiency by minimizing phase differences and optimizing power reception at short distances between the antenna array and the power receiver.
Implementation Method 1
an image acquiring unit configured to acquire an image through a fisheye lens
Data Source
AI summary
A distance estimation device includes circuitry that estimates a distance between an image acquiring device and a marker in a first axis direction, based on coordinates of an upper end portion and a lower end portion of the marker and a length between the upper end portion and the lower end portion.