Wireless Power Carrier Sensing With Interference Cancellation
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Solution Overview
Problem
Wireless power supply systems face interference issues when multiple apparatuses operate in the same environment, leading to erroneous carrier sense results and decreased efficiency due to the mixing of power supply signals and victim system signals.
Innovation Solution
Incorporating an interference avoidance function and interference canceller within the carrier sensor, which uses filters and signal processing techniques to distinguish and eliminate interference signals from other wireless power supply apparatuses, allowing accurate carrier sense and power supply operations without interfering with victim systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sense is performed in a wireless power supply apparatus, then interference with wireless systems can be avoided, but erroneous results occur when electromagnetic waves from other power supply apparatuses are present
Solution Approach 1:
The frequency band is divided into multiple sub-bands, and carrier sense is performed independently in each sub-band. This segmentation allows the system to identify and exclude sub-bands affected by interference from other power supply apparatuses, thereby improving the accuracy of carrier sense results.
Solution Approach 2:
An interference determination unit is introduced as an intermediary component that analyzes the received signal to determine whether it originates from a wireless system or another power supply apparatus. This intermediary unit enables the carrier sense unit to make accurate decisions by filtering out false interference signals.
2Productivity
If multiple wireless power supply apparatuses operate in the same environment, then power supply coverage is improved, but interference between apparatuses increases
Solution Approach 1:
By segmenting the frequency band into multiple sub-bands and performing carrier sense in each sub-band, the system enables multiple power supply apparatuses to operate simultaneously in different frequency segments, thereby expanding overall power supply coverage while minimizing mutual interference.
Solution Approach 2:
The system changes the frequency parameter by operating in different sub-bands, allowing multiple apparatuses to coexist in the same physical environment without causing harmful interference, thus improving productivity while controlling harmful factors.
3Measurement precision
If carrier sense monitors all frequency bands, then complete interference detection is achieved, but processing complexity and time increase
Solution Approach 1:
The frequency band is segmented into multiple sub-bands, and carrier sense is performed in each sub-band independently. This segmentation maintains complete interference detection capability while reducing the processing complexity of each individual sub-band, making the overall system more manageable and efficient.
Solution Approach 2:
Instead of processing the entire frequency band as a single unit, the system performs partial action by processing each sub-band separately. This approach achieves complete detection coverage through multiple partial processing steps, reducing the computational burden on each processing unit.
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
The solution effectively avoids interference between wireless power supply systems and victim systems, ensuring accurate carrier sense and efficient power supply operations by filtering out interference signals, thereby enhancing coexistence and reducing power supply signal interference.
Implementation Method 1
power transmission circuitry configured to transmit power by an electromagnetic wave with a first frequency band
Implementation Method 2
detection circuitry configured to receive a reception signal and to perform carrier sense with a second frequency band different from the first frequency band
Implementation Method 3
interference avoidance circuitry configured to eliminate a signal having a third frequency band which is a part of the second frequency band from the reception signal
Data Source
AI summary
A power supply system includes a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band, and a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band. The first power supply apparatus and the second power supply apparatus are provided so as to be 2H×{tan(θ)} or greater distant from each other, when each of the first power supply apparatus and the second power supply apparatus is provided in height H from a floor surface, where H is a positive number, and when a direction of a maximum value ±3 dB is in a range from −θ to +θ in a case where a perpendicular downward direction from each position is a standard.