NFC Module Induced Current Measurement for Wireless Charging Alignment
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Solution Overview
Problem
Conventional wireless charging configurations in thin portable devices suffer from inefficient energy transfer due to poor alignment of coil antennas, leading to wasted energy and suboptimal charging performance.
Innovation Solution
The implementation of an algorithm that utilizes an amplitude detector, analog-to-digital converter, and receiver indicator lights within the NFC module to measure induced current and adjust the alignment of coil antennas for maximum power transfer during wireless power transfer, optimizing the alignment to prevent energy waste and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer is implemented in thin portable devices with flat coil antennas, then wireless charging capability is achieved, but energy transfer efficiency deteriorates due to poor coil alignment
Solution Approach 1:
The system measures the induced current in the receiving coil and uses this feedback to determine whether to continue or stop power transmission. The algorithm compares the measured induced current to the transmitted power level and adjusts the wireless charging operation accordingly, optimizing energy transfer efficiency while maintaining wireless charging capability
Solution Approach 2:
The system changes the operational parameters of wireless power transfer based on measured conditions. By monitoring induced current levels and adjusting transmission parameters dynamically, the system optimizes energy transfer efficiency for the specific alignment conditions between transmitting and receiving coils
2Device complexity
If wireless power transfer operates without induced current measurement, then device complexity is reduced, but energy waste increases due to poor charging performance
Solution Approach 1:
The NFC module, which already exists for near field communication functions, is made multi-functional by also using it to measure induced current for wireless power transfer optimization. This approach adds energy monitoring capability without significantly increasing device complexity, as it leverages existing hardware infrastructure
Solution Approach 2:
The system uses its own NFC module to measure the induced current generated during wireless power transfer, rather than requiring separate dedicated measurement hardware. The receiving coil itself serves as the measurement element, and the system self-regulates power transmission based on its own performance metrics
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 enhances the efficiency of wireless charging by ensuring optimal alignment of coil antennas, reducing energy waste and improving charging performance while minimizing electromagnetic interference.
Implementation Method 1
The coil antenna may be utilized for the WPT such as, for example, when the coil antenna is exposed to magnetic fields that induce current to the coil antenna
Data Source
AI summary
Described herein are techniques related to near field coupling and wireless charging or wireless power transfer (WPT). More particularly, an induced current at a receiving coil antenna is measured and utilized as a basis for re-alignment with a transmitting coil antenna is described.