Multi-Coil Wireless Charging Control for Interference-Free Detection
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Solution Overview
Problem
Existing wireless power transmission systems with multiple power transmission coils face challenges in appropriate control methods, leading to interference and inefficiencies in simultaneous charging of multiple devices.
Innovation Solution
A power transmission apparatus with multiple coils that uses separate control circuits and timing differentiation to prevent interference by outputting detection signals from different coils at distinct positions, allowing simultaneous charging of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power transmission coils are used for simultaneous charging, then charging capacity and productivity are improved, but interference between coils and control complexity increase
Solution Approach 1:
The system segments the power transmission function by assigning different coils to different time slots. The control unit divides the charging process into multiple periods, with each period dedicated to a specific coil. This temporal segmentation allows multiple coils to operate simultaneously without interference, effectively increasing charging capacity while maintaining manageable control complexity through structured time division.
Solution Approach 2:
The system implements periodic action by operating power transmission coils in alternating time periods rather than continuously. Each coil is activated for a specific duration, then deactivated while another coil operates. This periodic operation pattern prevents electromagnetic interference between coils while ensuring continuous charging capability, thus improving productivity without proportionally increasing control complexity.
2Area of stationary object
If object detection signals are output from multiple coils simultaneously, then detection coverage is improved, but signal interference and reliability deteriorate
Solution Approach 1:
The object detection function is segmented across different time periods for each coil. Instead of all coils transmitting detection signals simultaneously, the control unit assigns specific time slots to each coil for detection signal transmission. This temporal segmentation expands the overall detection coverage over time while preventing signal interference, thereby maintaining high signal reliability.
Solution Approach 2:
The system performs preliminary object detection using the first power transmission coil before activating the second coil for power transmission. This preliminary detection action ensures that objects are identified and positioned appropriately before simultaneous operation begins, preventing detection signal interference while maintaining comprehensive detection coverage.
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
Efficient and interference-free simultaneous charging of multiple devices by effectively managing power transmission and detection signals across multiple coils.
Implementation Method 1
a power transmission unit configured to perform wireless power transmission to a power receiving apparatus using at least one of a plurality of coils
Implementation Method 2
a detection unit configured to perform object detection by outputting one or more signals for object detection from one or more of the plurality of coils
Data Source
AI summary
A power transmission apparatus performs wireless power transmission to a power receiving apparatus using at least one of a plurality of coils including a first coil and a second coil disposed at a position closer to the first coil than a position separated from the first coil by a specific distance, and perform object detection by outputting one or more signal for object detection from one or more of the plurality of coils. Signals for object detection are not outputted at a same time from the first coil and the second coil.