NFC and WPT Resonator Switching for Interference Management
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Solution Overview
Problem
Existing devices struggle to simultaneously integrate near field communication (NFC) and wireless power transmission (WPT) functions due to interference and space constraints, particularly in mobile devices where both require the same resonance frequency of 13.56 MHz, leading to inefficiencies and simultaneous usage limitations.
Innovation Solution
A power receiving apparatus with a resonator configured to selectively connect to either an NFC receiver or a WPT receiver based on power output, utilizing a mode selector and loss matching circuit to manage power distribution and prevent interference, allowing operation in either NFC or WPT mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both NFC and WPT functions are integrated in the same device, then the device provides more versatile functionality, but interference occurs between the two functions due to their shared resonance frequency of 13.56 MHz
Solution Approach 1:
The patent divides the resonator into two separate resonators: a first resonator for NFC function and a second resonator for WPT function. This segmentation allows each resonator to operate independently at the same frequency without interfering with each other, thus enabling both functions to coexist in the same device.
Solution Approach 2:
The patent implements a nested structure where one resonator is positioned inside or adjacent to the other resonator. This nested arrangement allows both NFC and WPT resonators to occupy overlapping or adjacent spatial regions while maintaining electromagnetic isolation, enabling compact integration without interference.
2Device complexity
If a single resonator is used for both NFC and WPT, then the device structure is simplified, but the device cannot simultaneously support both functions due to frequency conflict
Solution Approach 1:
The patent segments the single resonator into two distinct resonators with different resonance frequencies. This allows the device to support both NFC and WPT functions simultaneously by tuning each resonator to its appropriate frequency, avoiding the conflict that would arise from using a single resonator for both purposes.
3Ease of manufacture
If NFC and WPT share the same resonance frequency, then component integration is easier, but power distribution and mode selection become complex
Solution Approach 1:
The patent implements a dynamic mode selector that can switch between NFC mode and WPT mode based on operational requirements. This dynamic control mechanism manages power distribution to the appropriate resonator, simplifying the overall system by ensuring that only one function operates at a time despite both resonators being present in the device.
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
Enables efficient operation in either NFC or WPT mode by preventing interference and optimizing power usage, ensuring high efficiency and compatibility within limited device spaces.
Implementation Method 1
Wireless power refers to energy that is transferred from a wireless power transmitter to a wireless power receiver via magnetic coupling
Implementation Method 2
The resonator has a resonance frequency of 13.56 megahertz (MHz), and a Q-factor exceeding 100
Data Source
AI summary
An apparatus and method of using near field communication (NFC) and wireless power transmission (WPT) are provided. A power receiving apparatus includes a resonator configured to receive a power and to output the power. The power receiving apparatus further includes a near field communication (NFC) receiver configured to perform wireless communication using the power output by the resonator. The power receiving apparatus further includes a wireless power transmission (WPT) receiver configured to supply a voltage using the power output by the resonator. The power receiving apparatus further includes a connecting unit configured to selectively connect the resonator to either the NFC receiver or the WPT receiver. The power receiving apparatus further includes a mode selector configured to control the connecting unit to selectively connect the resonator to either the NFC receiver or the WPT receiver based on the power output by the resonator.