Wireless Charge Rate Control for WWAN Interference Mitigation
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Solution Overview
Problem
Wireless charging systems using near-field communication (NFC) protocols introduce noise and interference in wireless wide area network (WWAN) communication systems, degrading performance by causing harmonic noise in the same electromagnetic radiation band, particularly when the receive signal strength indicator (RSSI) value drops below a certain threshold.
Innovation Solution
A charge rate controller adjusts the wireless charging system's operation based on the RSSI value and charge state of peripheral devices, reducing or disabling charging when interference is detected to maintain communication system performance, and prioritizing charging for low-power devices or applications with network priority status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless charging system operates at maximum charge rate, then charging efficiency is improved, but interference in WWAN communication system increases
Solution Approach 1:
The wireless charging system dynamically adjusts its charge rate based on real-time WWAN signal quality metrics (RSSI). When RSSI indicates poor signal conditions, the system automatically reduces the charge rate to minimize electromagnetic interference, thereby maintaining both communication reliability and charging functionality without manual intervention.
Solution Approach 2:
The system implements a feedback mechanism that continuously monitors WWAN signal strength (RSSI) and uses this information to control the wireless charging power output. The feedback loop adjusts the charge rate in response to changing communication conditions, ensuring that charging efficiency is optimized when signal quality is good while preventing interference when signal quality deteriorates.
2Reliability
If the wireless charging system reduces charge rate to minimize interference, then WWAN communication performance is improved, but charging efficiency decreases
Solution Approach 1:
The system dynamically modulates the charge rate based on real-time WWAN signal conditions. When RSSI values indicate strong signal quality, the system operates at maximum charge rate for optimal charging efficiency. When RSSI drops below thresholds indicating poor signal quality, the system automatically reduces power output to maintain communication reliability, thus dynamically balancing both objectives without permanent compromise.
Solution Approach 2:
The system changes the operational parameters of the wireless charging system (specifically power output and charge rate) based on WWAN signal quality measurements. By adjusting these parameters in response to RSSI feedback, the system optimizes the trade-off between charging efficiency and communication performance, ensuring reliable WWAN operation while maintaining effective charging when conditions permit.
3Speed
If the wireless charging system operates continuously at high power, then charging speed is improved, but electromagnetic noise and interference increase
Solution Approach 1:
The system employs periodic monitoring of WWAN signal quality metrics and adjusts charging power in periodic intervals rather than continuous operation. This periodic control allows the system to maintain high charging speeds during favorable conditions while periodically reducing power to minimize electromagnetic noise when interference thresholds are exceeded, creating a rhythm of high-performance charging punctuated by noise-reduction phases.
Solution Approach 2:
The system changes power output parameters based on electromagnetic environment conditions. When WWAN signal quality is good, the system maintains high power levels for fast charging. When electromagnetic noise begins to interfere with communication (detected through RSSI monitoring), the system reduces power parameters to minimize noise generation, thus adaptively controlling charging speed to balance performance with electromagnetic pollution reduction.
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 minimizes interference in WWAN communication systems by dynamically adjusting the charge rate of the wireless charging system, ensuring reliable network connectivity while efficiently charging peripheral devices, particularly when the RSSI value is below a threshold or when applications with network priority are active.
Implementation Method 1
wireless charging system uses electromagnetic induction to charge peripheral devices
Implementation Method 2
NFC wireless charging system may utilize electromagnetic radiation at a frequency of 13.56 MHz
Implementation Method 3
wireless communication system that facilitates wireless communication via a first band of electromagnetic radiation
Data Source
AI summary
An example computing device includes a wireless communication device, such as a wireless wide area network (WWAN) communication device, that communicates in a first band of electromagnetic radiation, and a wireless charging system that wirelessly charges a peripheral device using a second band of electromagnetic radiation. The wireless charging system operating in the first band may introduce harmonic noise that negatively impacts communication in the second band. Accordingly, in various examples, the system operates to adjust the charge rate used by the wireless charging system based on a function of the charge state of the peripheral device and a received signal strength indicator (RSSI) value of a signal received by the wireless communication device. In some instances, the wireless charging rate of the peripheral device may be disabled or reduced when the RSSI value of the signal received by the wireless communication device is below a threshold value.