Wireless Power Transmission Direction Control for Moving Receivers
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Solution Overview
Problem
Non-contact power supply systems using radio waves face inefficiencies due to the need for calibration signal transmission and power transmission interruption, and increased calibration signal transmission/reception relative to power transmission, especially when multiple power reception apparatuses are moving.
Innovation Solution
A power transmission apparatus with a control unit that acquires movement information from power reception apparatuses and controls power transmission processing and adjustment processing to optimize power transmission direction, performing adjustment processing before power transmission for moving devices and minimizing it for stationary devices until they move.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration signal transmission is performed before power transmission for each power reception apparatus, then power transmission direction can be adjusted accurately, but power transmission efficiency decreases due to frequent interruptions and increased calibration processing time
Solution Approach 1:
The patent applies dynamics by changing the calibration frequency dynamically based on power reception apparatus movement state. When movement is detected, calibration is performed frequently; when stationary, calibration frequency is reduced. This resolves the contradiction by adapting the measurement precision maintenance strategy to the actual operational context, improving overall transmission efficiency while maintaining directional accuracy when needed.
Solution Approach 2:
The patent changes the parameter of calibration frequency based on the movement state of power reception apparatuses. By monitoring movement and adjusting calibration frequency accordingly (high frequency when moving, low frequency when stationary), the system optimizes the balance between directional accuracy and transmission efficiency, eliminating unnecessary calibration operations that reduce productivity.
2Reliability
If calibration processing is performed for multiple moving power reception apparatuses in succession, then each apparatus receives accurate power transmission, but the proportion of calibration processing time increases relative to power transmission time
Solution Approach 1:
The patent implements periodic calibration action based on movement detection. Instead of performing calibration continuously or successively for all apparatuses, the system performs calibration periodically only when movement is detected. This reduces the time proportion spent on calibration processing while maintaining reliability for moving apparatuses that actually require directional adjustment.
Solution Approach 2:
The power reception apparatus itself determines its movement state and requests calibration only when necessary (when moving). This self-service approach eliminates unnecessary calibration requests from stationary apparatuses, reducing overall calibration processing time while maintaining reliable power transmission for moving devices that need it.
3Device complexity
If the array antenna is used for both calibration signal reception and power transmission, then device complexity is reduced, but power transmission must be interrupted during calibration signal reception
Solution Approach 1:
The patent applies dynamics by making the calibration operation conditional on detected movement. The array antenna switches between power transmission and calibration modes dynamically - performing calibration only when movement is detected, and maintaining continuous power transmission when apparatuses are stationary. This resolves the contradiction by reducing interruptions while maintaining the single antenna system's simplicity.
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
This approach reduces the frequency of processing before power transmission and improves overall power transmission/reception efficiency by prioritizing power transmission to stationary devices and adjusting for moving devices.
Implementation Method 1
power is transmitted and received in a non-contact manner by electromagnetic induction, magnetic resonance, radio waves, or the like
Implementation Method 2
With radio waves in particular, it is possible to increase the distance between the power transmission apparatus and the power reception apparatus
Data Source
AI summary
A power transmission apparatus that supplies power in a non-contact manner to a plurality of power reception apparatuses, acquires movement information regarding the power reception apparatuses, and controls, in accordance with the movement information, power transmission processing and adjustment processing for adjusting a direction in which the power is transmitted. The power transmission apparatus performs control such that, in a case of transmitting power to a moving power reception apparatus, the adjustment processing is performed before the power transmission processing is performed, and in a case of transmitting power to a stationary power reception apparatus, the adjustment processing is performed before the power transmission processing is performed, and thereafter the power transmission processing is performed without performing the adjustment processing until the stationary power reception apparatus changes to a moving state.