Multi-Coil Wireless Power Control for Interference-Free Detection
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Solution Overview
Problem
Existing wireless power transmission systems with multiple coils face challenges in effective control methods, leading to interference and inefficient power transmission, particularly when simultaneously charging multiple devices.
Innovation Solution
A power transmission apparatus equipped with a detection unit and multiple power transmission coils, where the system intermittently stops power transmission to perform object detection using a different coil, preventing interference by selecting coils that do not interfere with each other and ensuring efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transmission is performed continuously using multiple coils, then power transmission efficiency is improved, but interference between coils occurs and object detection becomes difficult
Solution Approach 1:
The patent implements periodic action by intermittently stopping power transmission at predetermined intervals during the power transfer phase. This allows the system to perform object detection using a different coil without continuous transmission, thereby reducing interference while maintaining overall transmission efficiency through periodic operation cycles.
2Measurement precision
If object detection is performed using the same coil during power transmission, then detection continuity is improved, but transmission interference prevents accurate detection
Solution Approach 1:
The patent applies segmentation by dividing the coil array into different functional groups - one coil performs power transmission while another coil performs object detection. This spatial segmentation allows both functions to operate simultaneously without interference, as each coil is dedicated to a specific task during its active period.
Solution Approach 2:
The system periodically switches between transmission and detection modes using different coils. During predetermined intervals when power transmission is stopped, a different coil is activated for object detection, ensuring accurate detection without transmission interference while maintaining overall system productivity.
3Productivity
If multiple coils operate simultaneously for charging multiple devices, then charging capacity is improved, but coil interference increases and control complexity rises
Solution Approach 1:
The patent segments the multiple coils into independent operational units, where each coil can be controlled individually for transmission or detection tasks. This segmentation simplifies control complexity by allowing independent management of each coil's function, while still achieving high charging capacity through coordinated operation of multiple segmented units.
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 enables appropriate control of wireless power transmission, reduces interference between coils, and allows for simultaneous charging of multiple devices without compromising power transfer efficiency.
Implementation Method 1
a detection unit configured to perform object detection... in the specific period, the detection unit outputs a signal for object detection from a coil
Implementation Method 2
a power transmission unit configured to perform wireless power transmission to a power receiving apparatus via at least one of a plurality of coils
Data Source
AI summary
A power transmission apparatus performs object detection, perform wireless power transmission to the power receiving apparatus via at least one of a plurality of coils. The power transmission apparatus, in a power transfer phase, stops the wireless power transmission for a specific period and, in the specific period, outputs a signal for object detection from a coil that is from among the plurality of coils and is different from the at least one of the plurality of coils.