Wireless Power Transmitter Beam Pattern Switching for WLAN Interference
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Solution Overview
Problem
Wireless power supply systems face challenges in minimizing interference with Wireless Local Area Network (WLAN) communications, particularly when using microwave power transmission, as high-power transmission can interfere with adjacent WLAN channels, even when operating in different frequency bands.
Innovation Solution
The system employs a power transmission device and access point that dynamically adjust beam patterns to either a 'space sharing' or 'time sharing' pattern, ensuring that power supply periods either do not overlap with WLAN communication periods or are secured to prevent interference, using techniques like 'CTS-to-self' frames to reserve wireless LAN channel use periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high-power microwave transmission is used for wireless power supply, then power transmission efficiency is improved, but interference with adjacent WLAN channels increases
Solution Approach 1:
The patent applies beam pattern switching between first and second beam patterns based on channel availability detection. The system dynamically adjusts the beam pattern used for power transmission - using a first beam pattern when WLAN channels are available and a second beam pattern when they are occupied, thereby adaptively managing both power transmission efficiency and interference prevention
Solution Approach 2:
The patent changes the beam pattern parameter (spatial distribution of transmitted energy) based on detected channel conditions. By switching between different beam patterns with different spatial characteristics, the system maintains high power transmission efficiency when possible while preventing interference with WLAN channels when necessary
2Reliability
If beam pattern switching is implemented to suppress WLAN interference, then coexistence with WLAN is improved, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the system detects WLAN channel availability and uses this information to control beam pattern switching. The access point monitors the WLAN environment and provides feedback signals that trigger appropriate beam pattern changes, enabling reliable coexistence through closed-loop control
Solution Approach 2:
The patent introduces control signals and feedback mechanisms as intermediaries between the power transmission system and the WLAN environment. These intermediary elements mediate the interaction by carrying channel availability information and controlling beam pattern selection, managing complexity through structured communication protocols
3Object-generated harmful factors
If power supply period is set to avoid overlapping with WLAN communication period, then interference is suppressed, but power supply time increases
Solution Approach 1:
The patent dynamically adjusts power supply timing based on real-time detection of WLAN channel availability. Instead of using fixed time slots, the system continuously monitors channel conditions and schedules power transmission during available periods, optimizing both interference suppression and power supply efficiency through adaptive time management
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 effectively suppresses interference with adjacent WLAN channels, allowing for simultaneous wireless power supply and communication by optimizing power supply timing and beam pattern selection based on channel availability and usage conditions.
Implementation Method 1
Wireless power supply is a technique of achieving power transmission, without any cable, through electromagnetic induction
Data Source
AI summary
According to one embodiment, an electronic apparatus includes a power transmitter and controlling circuitry. The electronic apparatus is connectable with a first wireless communicator conforming to a first wireless communication scheme. The power transmitter supplies power to one or more apparatuses at one of a first beam pattern and a second beam pattern. The control circuitry sets a first power supply period on a first condition that the first power supply period is prohibited to overlap with a communication period of the first wireless communicator if the power is supplied at the first beam pattern, and sets a second power supply period on a second condition that the second power supply period is allowed to at least partially overlap with the communication period if the power is supplied at the second beam pattern.