Wireless Charging Coil Arrangement for Misalignment Tolerance
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Solution Overview
Problem
Current wireless charging systems face inefficiencies in power transfer due to misalignment between wireless power transmitting and receiving devices, particularly in devices with multiple coils, which can lead to reduced charging efficiency and compatibility issues.
Innovation Solution
The implementation of a wireless power system with a wireless power transmitting device that includes multiple coils arranged in a ring configuration and a wireless power receiving device featuring an elongated magnetic core with coils at opposing ends, allowing for efficient magnetic flux coupling and adaptive coil selection based on device characteristics for optimal power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple coils are used in the wireless power transmitting device, then power transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The wireless power transmitting device is divided into multiple independent coils arranged in a ring configuration. Each coil can be independently controlled and optimized, allowing the system to segment the power transmission function across multiple components. This segmentation enables selective activation of coils based on alignment requirements, improving overall power transfer efficiency while managing complexity through modular design
Solution Approach 2:
The system dynamically selects and activates specific coils based on real-time alignment conditions between transmitting and receiving devices. The controller adjusts which coils are active and at what power levels, creating a dynamic adaptation mechanism that optimizes power transfer efficiency for different device orientations and positions without requiring all coils to operate simultaneously
2Adaptability or versatility
If coils are configured to accommodate rotational misalignment, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The magnetic core is designed with an asymmetric elongated shape featuring pillar-shaped protrusions at opposing ends, rather than a symmetric configuration. This asymmetric design creates distinct magnetic flux paths that are optimized for receiving flux from specific coil orientations. The third coil positioned between the first and second coils further enhances this asymmetric flux reception capability, allowing the system to accommodate rotational misalignment while maintaining manageable manufacturing tolerances
Solution Approach 2:
The elongated magnetic core acts as an intermediary element between the multiple transmitting coils and the receiving device. The core with its specific geometry (pillar-shaped protrusions and elongated structure) mediates the magnetic flux distribution, guiding and concentrating flux from misaligned transmitting coils to the receiving coil, thereby accommodating rotational misalignment without requiring extreme manufacturing precision
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 configuration enhances power transfer efficiency by accommodating rotational misalignment and ensures reliable charging across various device orientations, improving compatibility and charging performance.
Implementation Method 1
The coil of the portable electronic device receives alternating-current wireless power signals from a coil in the wireless charging mat
Implementation Method 2
The rectifier circuitry converts the received signals into direct-current power
Data Source
AI summary
A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may be a wireless charging mat with one or more coils or may be a wireless charging puck with one or more coils. In some embodiments, the wireless charging puck may have six coils or other number of coils arranged in a ring. The wireless power receiving device may have an elongated magnetic core such as a C-shaped core with pillars at opposing ends. First and second coils may be formed on the pillars and a third coil may be formed between the first and second coils. The coils of the wireless power receiving device such as the first and second coils on the magnetic core may be configured to receive magnetic flux emitted by a pair of the six coils in the wireless charging puck.