Wireless Charging Pad Shape Detection and Dynamic Selection
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Solution Overview
Problem
The existing wireless charging systems for electric vehicles face inefficiencies due to varying shapes of receiving and transmitting pads, leading to reduced coupling performance and potential failure in power transmission, as magnetic characteristics differ based on pad shapes and current directions, resulting in suboptimal charging efficiency.
Innovation Solution
A wireless charging apparatus that includes a pad determinator with a searching coil and controller to determine the shape of the receiving pad and select a corresponding transmitting pad, optimizing magnetic coupling characteristics for improved power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed transmitting pad shape is used, then the device complexity is reduced, but the coupling performance deteriorates when the receiving pad shape varies
Solution Approach 1:
The transmitting pad configuration is made dynamic by switching between different pad shapes (CP, DDP, DDQP, BPP) based on the detected receiving pad type. The system dynamically selects the optimal transmitting pad shape to match the receiving pad, ensuring high coupling performance while maintaining manageable device complexity through controlled adaptability.
Solution Approach 2:
The system changes the physical parameter of the transmitting pad (its shape configuration) to match the receiving pad. By detecting the receiving pad shape and switching the transmitting pad to a corresponding shape, the system optimizes magnetic coupling characteristics and ensures reliable power transmission across different vehicle types.
2Reliability
If multiple transmitting pad shapes are prepared to match different receiving pads, then the coupling performance is improved, but the device complexity increases
Solution Approach 1:
Rather than maintaining all pad configurations simultaneously, the system uses dynamic switching to activate only the required transmitting pad shape based on real-time detection of the receiving pad type. This reduces the effective device complexity while preserving the ability to achieve high coupling performance for any receiving pad configuration.
Solution Approach 2:
The system performs preliminary detection of the receiving pad shape before power transmission begins. Based on this advance knowledge, it pre-selects and configures the appropriate transmitting pad shape, ensuring optimal coupling performance is ready before charging starts, thereby managing complexity through proactive configuration.
3Speed
If the transmitting pad shape is selected without detecting the receiving pad, then the operation speed is improved, but the charging efficiency deteriorates
Solution Approach 1:
The system performs rapid detection of the receiving pad shape immediately upon contact, before power transmission begins. This preliminary detection step is optimized to be quick, allowing the system to identify the pad type and configure the transmitting pad in advance, thus maintaining fast operation speed while ensuring high charging efficiency through proper pad matching.
Solution Approach 2:
The system uses feedback from the detection process (measuring inductance changes of the searching coil) to automatically determine the receiving pad shape and adjust the transmitting pad configuration accordingly. This closed-loop feedback mechanism ensures that the transmitting pad is optimally configured based on real-time information, maximizing charging efficiency without sacrificing operational speed.
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 enhances charging performance by accurately determining the receiving pad's shape and selecting the appropriate transmitting pad, thereby improving coupling efficiency and ensuring reliable power transmission between pads.
Implementation Method 1
determine the receiving pad through a change in inductance of the searching coil due to a difference in magnetic coupling characteristics between the searching coil and the receiving pad
Data Source
AI summary
A wireless charging apparatus according to an embodiment of the present disclosure includes a pad determinor configured to determine a receiving pad mounted on an electric vehicle entering a wireless charging station, and a power transmitter configured to select a transmitting pad to correspond to the receiving pad determined by the pad determinor, and transmit charging power to the receiving pad through the transmitting pad.