Wireless Power Transfer Control for Efficient Power Conversion Windows
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Solution Overview
Problem
Current wireless power transfer technologies face inefficiencies due to high Peak to Average Power Ratio (PAPR), which can lead to overheating and hardware breakdown, and existing power control schemes do not account for non-monotonic power conversion efficiency in terminal devices.
Innovation Solution
Implementing a power control scheme that defines a receiving power window for wireless power transfer, allowing terminal devices to report their power conversion efficiency thresholds, enabling the base station to optimize power transmission and maintain high efficiency by adjusting transmission power based on reported categories and channel state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transfer transmission is performed at high power levels, then power transfer rate is improved, but power conversion efficiency deteriorates due to non-monotonic efficiency characteristics
Solution Approach 1:
The patent implements dynamic power adjustment by dividing transmission into multiple power levels and dynamically selecting the appropriate power level based on reported efficiency thresholds. The base station adjusts transmission power in real-time according to terminal device feedback, transitioning from static to dynamic power control to maintain optimal efficiency across varying power transfer rates.
Solution Approach 2:
The patent changes the power transmission parameter by implementing a power conversion window defined by lower and upper thresholds. The base station modifies transmission power parameters to keep the actual received power within this window, where efficiency is optimized. This involves adjusting power levels based on reported thresholds to maintain operation within the efficient power conversion range.
2Productivity
If wireless power transfer transmission is performed at high power levels, then power transfer rate is improved, but device temperature increases leading to overheating
Solution Approach 1:
The patent applies preliminary anti-action by having terminal devices report their power conversion efficiency thresholds to the base station before power transfer begins. This advance information allows the base station to pre-calculate appropriate power levels that will prevent overheating while maintaining adequate transfer rates, countering the overheating issue before it occurs.
Solution Approach 2:
The patent implements feedback mechanisms where terminal devices report efficiency thresholds and power level preferences to the base station. The base station uses this feedback to adjust transmission power dynamically, creating a closed-loop control system that prevents overheating by responding to terminal device conditions in real-time.
3Device complexity
If fixed power level transmission is used, then system complexity is reduced, but power conversion efficiency cannot be optimized for different terminal devices
Solution Approach 1:
The patent segments the power transmission into multiple discrete power levels (first, second, third power levels) rather than using a continuous or fixed power level. This segmentation allows the system to select from predefined power level options based on terminal device feedback, optimizing efficiency without requiring complex continuous power adjustment mechanisms.
Solution Approach 2:
The patent enables terminal devices to self-report their efficiency thresholds and power level preferences to the base station. This self-service approach allows devices to communicate their optimal operating parameters, enabling the base station to optimize power transmission efficiently without requiring complex device-side power management circuitry.
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 optimizes power conversion efficiency, prevents overheating, and ensures reliable energy harvesting by maintaining the optimal power conversion operation point for terminal devices, thereby enhancing the performance and longevity of wireless power transfer systems.
Implementation Method 1
power conversion efficiency of a terminal device may not be monotonic with respect to a received power level
Data Source
AI summary
Apparatuses and methods in a communication system and controlling power of wireless power transfer are disclosed. A solution includes receiving from at least one terminal device information on power conversion window of wireless power transfer transmission requested by the terminal device, determining the power level of wireless power transfer transmission based at least in part on the received information and controlling wireless power transfer transmission based on the determination.