Dynamic Power Adjustment for Wireless Charging Interference
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Solution Overview
Problem
Wireless charging systems interfere with radio frequency communications in mobile devices, causing electromagnetic interference that hampers data transmission during charging.
Innovation Solution
A wireless charging system that includes a power transmitter unit (PTU) and a power receiver unit (PRU) with a de-tuning mechanism, where the PRU can selectively de-tune its resonant receiver circuit to reduce power absorption and mitigate interference by adjusting capacitance, allowing for concurrent data communication during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power receiver unit operates at resonance frequency to maximize power absorption, then wireless charging efficiency is improved, but electromagnetic interference with radio frequency communications increases
Solution Approach 1:
The resonant receiver circuit is designed to dynamically adjust its resonant frequency based on operational requirements. The circuit can switch between being tuned to the wireless charging frequency (for power absorption) and being detuned (for communication operations), allowing the system to adapt its power absorption characteristics in real-time to minimize interference while maintaining charging efficiency when needed
Solution Approach 2:
The system changes the resonant frequency parameter of the receiver circuit selectively. During wireless charging operations, the receiver is tuned to resonate at the charging frequency to maximize power transfer. During radio frequency communications, the receiver is detuned by changing its resonant frequency away from the charging frequency, thereby reducing electromagnetic interference with communication signals
2Productivity
If wireless charging operates continuously, then power transfer efficiency is improved, but radio frequency data transmission is disrupted
Solution Approach 1:
The system implements periodic switching between charging mode and communication mode. The resonant receiver circuit is periodically tuned and detuned in coordination with the wireless charging transmitter and the mobile device's communication scheduler. This periodic action allows both wireless charging and RF communications to operate effectively by dividing time into alternating charging and communication intervals
Solution Approach 2:
The system dynamically adjusts the resonant frequency of the receiver circuit based on the operational state. When data transmission is required, the receiver dynamically detunes to reduce interference. When charging is prioritized, the receiver dynamically retunes to maximize power absorption. This dynamic adaptation enables the system to maintain high productivity in both charging and communication functions
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 system effectively reduces electromagnetic interference, enabling mobile devices to maintain radio frequency operations without disrupting wireless charging, thereby enhancing communication capabilities during power transfer.
Implementation Method 1
a resonant receiver circuit that selectively de-tunes to receive less power from a power transmitter unit that generates an electromagnetic field
Implementation Method 2
a coil that receives an AC electromagnetic field and converts the AC electromagnetic field into an AC electromagnetic current
Data Source
AI summary
Wireless charging, such as that conducted according to standards formed by the AirFuel Alliance and/or various other industry standards for wireless charging, can cause interference with data transfer on a cellular modem of a mobile device. Systems, devices, and methods herein provide power breaks where a power transmitter unit (PTU) will stop generating an electromagnetic field used to charge a power receiver unit (PRU). During the power break, the mobile device can send or receive data over the cellular modem with less or no interference from the wireless charging operations. If the PTU cannot provide a power break, the PRU de-tunes a receive resonator circuit in the PRU to mitigate the interference from the wireless charging operations. Further, the power breaks can also be used by PTUs to scan for near field communication (NFC) tags or devices that could be damaged by wireless charging activities.