RF Beamforming Wireless Power Transmission via TDD Phase Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
RF wireless power transmission (WPT) techniques face low power efficiency due to omnidirectional transmission, which results in power being wasted as it is not focused on specific targets.
Innovation Solution
The implementation of RF beamforming based on time division duplex (TDD) communication, where a power transmitting unit (PTU) and power receiving unit (PRU) use beacons and phase difference analysis to allocate dedicated power slots, allowing each antenna to form directional beams and transmit power only to focused targets within the ISM band, adjacent to the guard band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RF wireless power transmission uses omnidirectional transmission to allow transmission to multiple receiver devices, then transmission coverage and versatility are improved, but power efficiency deteriorates due to power being wasted without focus on specific targets
Solution Approach 1:
The patent applies beamforming technology to create directional power transmission beams that concentrate power delivery to specific target locations rather than omnidirectional broadcasting. The system dynamically adjusts beam direction and focus based on receiver position and power requirements, enabling localized power delivery that improves efficiency while maintaining the ability to serve multiple receivers through sequential or simultaneous targeted beams.
Solution Approach 2:
The system dynamically adjusts beamforming parameters including phase, amplitude, and direction of individual antenna elements based on real-time channel conditions and receiver positions. This dynamic adaptation allows the system to optimize power efficiency for each transmission while maintaining versatility to serve multiple receivers as they move or change power requirements.
2Loss of energy
If RF beamforming is implemented to focus power on specific targets, then power efficiency is improved, but system complexity increases due to the need for beamforming control and phase difference analysis
Solution Approach 1:
The patent implements a feedback mechanism where the system estimates channel state information and phase differences based on received signals from receivers. This feedback allows the transmitter to automatically adjust beamforming parameters to maintain optimal power delivery efficiency without requiring complex manual configuration or centralized control, thereby reducing operational complexity while maintaining high efficiency.
Solution Approach 2:
The beamforming system performs self-adjustment by automatically estimating phase differences and optimizing beam directions based on received signal characteristics. This self-service capability reduces the need for external control systems or complex coordination mechanisms, simplifying the overall system architecture while maintaining power delivery efficiency.
3Productivity
If dedicated power slots are allocated to specific receivers through TDD communication, then power transmission efficiency is improved, but communication protocol complexity increases
Solution Approach 1:
The patent employs Time Division Duplex (TDD) communication with periodically allocated dedicated power slots for different receivers. This periodic time-division multiplexing approach allows the system to efficiently manage multiple receivers by assigning specific time slots for power transmission to each, improving overall power transmission efficiency while using a relatively simple and standardized TDD protocol framework that avoids more complex scheduling mechanisms.
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 significantly increases power transmission efficiency by ensuring power is directed only to intended receivers, thereby enhancing the overall efficiency of wireless power transfer.
Implementation Method 1
RF wireless power transmission (RF WPT) refers to a technique of wirelessly transmitting electric power through radio waves
Implementation Method 2
power is transferred over short distances by magnetic fields using inductive coupling between coils of wire
Implementation Method 3
power is transferred over short distances by magnetic fields using inductive coupling between coils of wire or by electric fields using capacitive coupling between metal electrodes
Data Source
AI summary
A power transmitting unit (PTU) for wireless power transmission (WPT) includes a communication transceiver and a power controller. The communication transceiver connects a communication link with at least one power receiving unit (PRU) through legacy communication and exchanges parameters necessary for the WPT through the connected communication link. The power controller is configured to transmit, to the PRU, a PTU beacon containing information about a dedicated power slot (DPS) allocated to the PRU in a super frame including a plurality of DPSs, to receive a PRU beacon from the PRU, to extract a phase difference between a plurality of antennas by analyzing a continuous wave (CW) of the PRU beacon, and to transmit power to the PRU in the allocated DPS in consideration of the phase difference.