Dual-Section Wireless Power Coil for Efficient Bidirectional Transfer
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Solution Overview
Problem
There is a need for wireless power transfer technology that allows portable devices to receive and transmit power without spatial limitations, particularly for devices with large battery capacities and those requiring efficient charging methods.
Innovation Solution
A wireless power transmitting and receiving device is designed with a coil having different numbers of turns for receiving and transmitting power, along with a converting and rectifying unit that rectifies received power, converts external power to alternating current, and manages power transmission and reception modes using switches and capacitors, enabling efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is used for both power receiving and transmitting, then device complexity is reduced, but power transfer efficiency deteriorates due to suboptimal coil configuration for dual-function operation
Solution Approach 1:
The coil is divided into two distinct sections: a first coil section with a first number of turns optimized for power receiving, and a second coil section with a second number of turns optimized for power transmitting. This segmentation allows each section to be independently optimized for its specific function, improving overall power transfer efficiency while maintaining a unified coil structure that does not increase device complexity.
2Use of energy by moving object
If the coil is configured with more turns for receiving power, then power receiving efficiency is improved, but power transmitting capability deteriorates due to increased inductance
Solution Approach 1:
Different sections of the coil have different local properties: the first coil section has a first number of turns specifically optimized for power receiving efficiency, while the second coil section has a second number of turns optimized for power transmitting capability. This local differentiation resolves the contradiction by allowing each section to have the optimal turn count for its specific function without compromising the other.
3Productivity
If a converting and rectifying unit with multiple switches and capacitors is used, then power conversion efficiency is improved, but device complexity increases
Solution Approach 1:
The converting and rectifying unit is designed to perform multiple functions: it can operate in a first mode to convert externally supplied direct current power to alternating current for the second coil section, and in a second mode to rectify induced alternating current from the first coil section to direct current for battery charging. This multi-functionality improves power conversion efficiency across different operating conditions while avoiding the need for completely separate circuit systems.
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 enables efficient wireless power transfer without spatial constraints, supporting devices with large battery capacities and ensuring reliable charging by adapting power transmission and reception modes effectively.
Implementation Method 1
Wireless power transfer technology has been widely applied to chargers of communications apparatuses, portable apparatuses, and various home appliances
Implementation Method 2
a converting and rectifying unit configured to: rectify the power received through the coil
Data Source
AI summary
A wireless power transmitting and receiving device includes: a coil including a first section having a first number of turns and configured to receive power and a second section having a second number of turns different from the first number of turns and configured to transmit power and a converting and rectifying unit configured to: rectify the power received through the coil, convert externally-supplied power into alternating current power, and apply the alternating current power to the coil.