Wireless Power Waveforming for SAR-Limited Energy Pockets
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Solution Overview
Problem
Conventional wireless charging systems are limited in their ability to transmit power over meaningful distances and do not effectively manage power wave production or track mobile electronic devices, failing to comply with electromagnetic field exposure regulatory standards.
Innovation Solution
The system generates and transmits power waves that converge at specific locations to form pockets of energy or null spaces within a transmission field, using sensors and pre-stored calculations to determine specific absorption rate (SAR) values and adjust waveform characteristics to ensure safe and efficient energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional wireless charging systems transmit power over larger distances, then the transmission area is improved, but electromagnetic field exposure limits are exceeded
Solution Approach 1:
The patent segments the transmission field into multiple zones based on SAR values, with different power wave configurations for each zone. This allows the system to expand transmission area while maintaining safety by adjusting power distribution across segmented regions rather than uniformly increasing exposure throughout the entire area.
Solution Approach 2:
The patent implements location-specific power wave transmission by calculating SAR values for different spatial locations and transmitting power waves with characteristics tailored to each location's requirements. This ensures that each local area receives appropriate power levels that maintain safety standards while enabling overall transmission area expansion.
2Area of stationary object
If power waves are transmitted to cover larger areas, then the transmission coverage is improved, but power density at specific locations increases beyond safe limits
Solution Approach 1:
The patent dynamically adjusts power wave characteristics including frequency, amplitude, and phase based on real-time SAR calculations for different locations. This dynamic adaptation allows the system to expand transmission coverage while preventing excessive power density accumulation at any specific location by continuously optimizing wave parameters.
Solution Approach 2:
The patent changes physical parameters of power waves (frequency, amplitude, phase) based on spatial location and SAR values. By modifying these parameters, the system can distribute power over larger areas without concentrating excessive power density at any single point, thus expanding coverage while maintaining safety.
3Productivity
If the system transmits power waves to multiple locations simultaneously, then the charging efficiency is improved, but SAR thresholds are exceeded in certain areas
Solution Approach 1:
The patent segments the transmission field into multiple zones with different power wave configurations, allowing simultaneous charging at multiple locations while maintaining SAR compliance in each segment. This segmentation enables parallel charging operations without exceeding safety thresholds in any individual area.
Solution Approach 2:
The patent applies location-specific power wave transmission by calculating SAR values for each spatial location and transmitting power waves with characteristics optimized for that location. This allows efficient simultaneous charging at multiple locations while ensuring each location remains within safe SAR limits.
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 approach allows for safe and efficient wireless power transmission over larger areas while adhering to regulatory limits, enabling effective charging of mobile devices and maintaining consistent energy levels without exceeding SAR thresholds.
Implementation Method 1
calculating, by a transmitter, a specific absorption rate (SAR) value at each spatial location within a transmission field of the transmitter with respect to one or more power waves radiated from one or more antennas of the transmitter
Implementation Method 2
transmitting, by the transmitter, the one or more power waves to converge destructively at the selected portion within the transmission field
Data Source
AI summary
Embodiments disclosed herein may generate and transmit power waves that, as result of their physical waveform characteristics (e.g., frequency, amplitude, phase, gain, direction), converge at a predetermined location in a transmission field to generate a pocket of energy. Receivers associated with an electronic device being powered by the wireless charging system, may extract energy from these pockets of energy and then convert that energy into usable electric power for the electronic device associated with a receiver. The pockets of energy may manifest as a three-dimensional field (e.g., transmission field) where energy may be harvested by a receiver positioned within or nearby the pocket of energy.