Wireless Power Beamforming for Beacon-Based Power Control
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Solution Overview
Problem
Existing methods for preventing excessive power supply to wireless power reception devices are costly, inefficient, and pose a risk of damage due to direct power measurement or nonlinearity, while methods using beacon signals struggle with antenna radiation differences and accuracy in determining transmission power.
Innovation Solution
A wireless power supply system that uses reception beam forming and transmission beam forming based on beacon signals to determine and adjust transmission power, eliminating the need for power measurement in the reception device and reducing the risk of saturation and damage by accurately estimating propagation loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reception power is measured directly in the power reception device, then power supply safety is improved, but device cost increases due to additional measurement mechanisms
Solution Approach 1:
The patent introduces a beacon signal as an intermediary to transfer power information from the power reception device to the power transmission device. Instead of directly measuring power at the reception device, the system uses bidirectional beacon signal exchange where the reception device reports its power status through the beacon signal, and the transmission device adjusts transmission power based on this feedback. This eliminates the need for complex measurement mechanisms in the reception device while maintaining power supply safety.
2Reliability
If a weak test beam is transmitted to measure reception power, then breakage risk is reduced, but power supply time efficiency declines due to unnecessary power exchange
Solution Approach 1:
The patent performs preliminary power measurement through beacon signal exchange before actual power transmission begins. The power reception device measures the beacon signal strength and reports back to the transmission device, allowing the transmission power to be predetermined and optimized before the main power supply operation. This preliminary action eliminates the need for repeated test beams during power transmission, significantly improving time efficiency while maintaining breakage prevention through accurate power control.
3Device complexity
If transmission power is determined from beacon signal intensity, then device complexity is reduced, but accuracy deteriorates due to antenna radiation characteristic differences
Solution Approach 1:
The patent addresses antenna radiation characteristic differences by dynamically adjusting measurement parameters. The system measures beacon signal strength at multiple power levels and uses the relationship between these measurements to calculate propagation loss. By changing the measurement conditions (different power levels, multiple antennas) and using the variations in results, the system compensates for antenna radiation differences and achieves accurate transmission power determination without increasing device complexity.
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 efficient power transmission without additional hardware, reduces the risk of saturation and damage, and optimizes power supply by selecting appropriate rectifiers and considering battery residual amounts, thereby enhancing system efficiency and reliability.
Implementation Method 1
a receiver configured to receive a first signal from a power reception device via a plurality of antennas
Implementation Method 2
the receiver receives a second signal from the power reception device by reception beam forming based on the plurality of weights
Implementation Method 3
the wireless power supply device further comprises a transmitter configured to transmit the power signal based on the transmission power by transmission beam forming based on the plurality of weights
Data Source
AI summary
According to one embodiment, a wireless power supply device includes: a receiver configured to receive a first signal from a power reception device via a plurality of antennas; and a controller configured to determine a plurality of weights used for the plurality of antennas based on a reception signal of the first signal, wherein the receiver receives a second signal from the power reception device by reception beam forming based on the plurality of weights, the controller determines transmission power of a power signal to be transmitted to the power reception device based on reception power of the second signal, and the wireless power supply device further comprises a transmitter configured to transmit the power signal based on the transmission power by transmission beam forming based on the plurality of weights.