Wireless Power Transmitter Carrier Sense Interference Avoidance
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Solution Overview
Problem
Wireless power supply devices face interference issues with other wireless systems due to the transmission of high-power electromagnetic waves, which can affect frequency bands used by nearby devices, leading to potential disruptions in communication and operation.
Innovation Solution
The implementation of a wireless power transmitter (WPT) that employs carrier sense (CCA) to detect and adjust its power transmission based on the presence of nearby wireless systems, using CCA threshold values to determine when to transmit power and avoid interfering with other devices, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-power electromagnetic waves are transmitted for efficient power supply, then power transmission efficiency is improved, but interference with other wireless systems in close frequency bands occurs
Solution Approach 1:
The wireless power supply device performs carrier sense (CCA) detection in close frequency bands before transmitting high-power electromagnetic waves. By detecting the presence of other wireless signals in advance and adjusting or avoiding transmission in those frequency bands, the device prevents interference while maintaining efficient power transmission in clear frequency bands
Solution Approach 2:
The device dynamically adjusts transmission parameters including frequency band selection, transmission power level, and transmission timing based on real-time CCA detection results. When interference is detected, the device changes frequency bands or reduces power; when no interference is present, it transmits at optimal power levels for efficient charging
2Object-generated harmful factors
If carrier sense is performed continuously in close frequency bands to avoid interference, then interference with other wireless systems is reduced, but transmission time and power supply efficiency decrease
Solution Approach 1:
Instead of continuous monitoring, the device performs CCA detection periodically at scheduled intervals before power transmission cycles. This periodic approach maintains adequate interference detection capability while allowing power transmission to proceed without unnecessary delays, thus balancing coexistence with other wireless systems against power supply efficiency
Solution Approach 2:
The device performs CCA detection on a selective basis rather than continuously across all frequency bands. By monitoring only close frequency bands that are most likely to cause interference and conducting detection at strategic moments in the transmission cycle, the device achieves adequate interference avoidance with minimal impact on overall power supply 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 approach allows for efficient power transmission while reducing interference with other wireless systems, ensuring coexistence and maintaining the functionality of both the power supply and communication devices.
Implementation Method 1
transmission circuitry configured to transmit power with a first electromagnetic wave in a first frequency band
Implementation Method 2
processor circuitry configured to execute a carrier sense during a first period, in at least a second frequency band different from the first frequency band
Data Source
AI summary
According to one embodiment, transmission circuitry transmits power with a first electromagnetic wave in a first frequency band. A processor circuitry executes a carrier sense during a first period, in at least a second frequency band different from the first frequency band. The transmission circuitry transmits power with a second electromagnetic wave in the first frequency band in a second period following the first period, if a wireless signal is not detected by the carrier sense during the first period. The processor circuitry executes the carrier sense during a third period following the first period in the at least the second frequency band, if the wireless signal is detected by the carrier sense during the first period.