Multi-Directional Receiving Antennas for Wireless Power Alignment
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Solution Overview
Problem
The orientation of the antenna of the power receiving device relative to the power transmitting device affects power reception efficiency, limiting the improvement of power reception efficiency by only directing the directivity of microwaves toward the power receiving device.
Innovation Solution
A power receiving device with multiple antenna groups, each having different directivities, a transmitter for sending a beacon signal, a switching unit for selecting the receiving antenna group, and a control unit that searches for the antenna group with the highest power reception efficiency and adjusts accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the directivity of microwaves is directed toward the power receiving device, then power transmission efficiency is improved, but power reception efficiency is limited due to antenna orientation constraints
Solution Approach 1:
The power receiving device is divided into multiple antenna groups (first antenna group and second antenna group) with different directivities. Each antenna group can be independently selected to receive power transmission signals, allowing the system to overcome the limitation of single-antenna orientation and improve power reception efficiency by choosing the optimally oriented antenna group.
2Loss of energy
If multiple antenna groups with different directivities are used, then power reception efficiency is improved, but device complexity increases
Solution Approach 1:
The system employs a switching unit that dynamically selects between different antenna groups based on reception conditions. The control unit monitors power values from beacon signal transmissions and automatically switches to the antenna group providing optimal power reception, making the antenna system adaptive rather than static.
Solution Approach 2:
The control unit uses feedback from power value measurements obtained during beacon signal transmission to determine which antenna group should be used for power reception. The system continuously monitors reception quality and adjusts antenna group selection accordingly, creating a closed-loop control system that optimizes 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
This configuration enhances power reception efficiency by mitigating the impact of antenna orientation and allowing the device to automatically select the most efficient antenna group, thereby improving the ratio of converted power to transmitted power.
Implementation Method 1
a plurality of antenna groups each comprising at least one antenna to receive a power transmission signal transmitted for contactless power transfer from a power transmitting device
Implementation Method 2
a transmitter that transmits a beacon signal to the power transmitting device for each of the plurality of antenna groups
Data Source
AI summary
A power receiving device includes plural antenna groups each including at least one antenna to receive a power transmission signal transmitted for contactless power transfer from a power transmitting device and respectively having different directivities, a transmitter that transmits a beacon signal to the power transmitting device for each of the antenna groups, a switching unit that switches to a receiving antenna group to receive the power transmission signal that is selected from the antenna groups, and a control unit that searches for the receiving antenna group for which a power value obtained by converting the power transmission signal transmitted from the power transmitting device based on the transmission of the beacon signal is not less than a predetermined threshold value, retransmits the beacon signal corresponding to the searched receiving antenna group, and charges a charging target by receiving the power transmission signal transmitted toward the receiving antenna group.