Autonomous Wireless Charging Coil Repositioning via Power Loss Tracking
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Solution Overview
Problem
Existing wireless charging systems face inefficiencies due to large position detection circuit boards, dead zones, and high costs, with users needing to manually align devices for optimal charging, leading to suboptimal charging efficiency and increased noise.
Innovation Solution
An autonomous wireless charging system using a tray-type case with power loss tracking, where a microcontroller periodically monitors power loss values to align the power transmitting coil with the power receiving coil, eliminating the need for a position detection circuit board and reducing the stroke zone, thereby enhancing hardware and cost efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position detection circuit board is used to detect the position of the wireless device, then the charging position can be detected, but the hardware cost and device complexity increase significantly
Solution Approach 1:
The patent extracts the position detection function from the traditional position detection circuit board and relocates it to the existing FOD detection system. By reusing the FOD detection circuit board and its sensors, the system eliminates the need for a separate position detection circuit board, thereby reducing hardware complexity while maintaining position detection capability
Solution Approach 2:
The FOD detection circuit board is made multi-functional by enabling it to perform both foreign object detection and position detection functions. The same sensors and circuitry used for FOD detection are repurposed to detect the position of the wireless device, reducing overall system complexity and hardware costs
2Productivity
If the power transmitting coil moves a long distance to align with the power receiving coil, then charging efficiency improves, but noise increases and the moving mechanism becomes more complex
Solution Approach 1:
The system performs preliminary position detection and calculation before moving the power transmitting coil. The controller calculates the optimal position and movement distance in advance, allowing the coil to move directly to the target position without unnecessary intermediate movements, thereby reducing noise and improving charging efficiency
Solution Approach 2:
The system uses feedback from power loss tracking during FOD detection to continuously monitor and adjust the position of the power transmitting coil. This feedback mechanism ensures the coil reaches the optimal alignment position with minimal movement, reducing noise while maintaining high charging efficiency
3Area of stationary object
If a large area circuit board is used to cover the entire pad area for position detection, then position detection coverage is improved, but the cost and device complexity increase
Solution Approach 1:
The patent extracts the position detection function from a large-area position detection circuit board and implements it using the existing FOD detection circuit board. By reusing the FOD sensors and circuitry across the pad area, the system achieves full coverage position detection without requiring a separate large-area circuit board
Solution Approach 2:
The FOD detection circuit board is designed to serve multiple functions: foreign object detection, position detection, and power loss tracking. This multi-functionality eliminates the need for dedicated position detection circuitry across the entire pad area, reducing hardware complexity 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
This solution maximizes charging efficiency by precisely tracking the power receiving coil's position using power loss values, reduces assembly complexity, and minimizes noise and component costs, ensuring stable and efficient charging across various applications.
Implementation Method 1
In a magnetic induction method, the near-field energy of a power induction coil from electromagnetic waves is coupled to a power reception induction coil, thereby achieving efficient energy.
Implementation Method 2
the near-field energy of a power induction coil from electromagnetic waves is coupled to a power reception induction coil
Data Source
AI summary
The present invention relates to an autonomous wireless charging system, and more specifically, to a tray-type case and a high-precision autonomous wireless charging system based on power loss tracking, whereby, in terms of performance, the center position of a power receiving coil of a wireless device having a battery mounted therein, the wireless device being placed on top of a charger pad, is precisely tracked through a controller in the system by periodically tracking a difference in the increase/decrease of a power loss value generated in the process of foreign object detection of a power transmitter, and even when the position of the wireless device shifts, a power transmitting coil mounted in a moving device unit is accurately repositioned to the changed position through threshold value identification or, when necessary, by the selective use of a sensor matrix, thereby enabling the centers of the power transmitting coil and the power receiving coil to always coincide, and thus a maximum level of wireless charging efficiency may be constantly maintained during charging.