Large-Area Wireless Power Transfer with Discovery and End-of-Charge Modes
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Solution Overview
Problem
Legacy wireless power transfer systems suffer from inefficiencies due to constant power consumption and lack of efficient operating modes, leading to waste of resources and environmental harm.
Innovation Solution
The implementation of a wireless power transfer system with optimized operating modes, including a discovery mode for efficient detection and an end-of-charge mode to conserve energy, along with a load switch to disconnect the system when the load is fully charged, reducing unnecessary power draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless power transfer system operates continuously to ensure power availability, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically transitions between three operating modes (discovery mode, power transfer mode, end-of-charge mode) based on real-time conditions. The transmission controller adjusts system operation from continuous scanning in discovery mode to active power transfer mode, and finally to low-power end-of-charge mode, optimizing energy consumption while maintaining reliability when needed
Solution Approach 2:
The system employs periodic discovery modes where the transmission antenna periodically scans for receivers instead of continuous operation. This periodic scanning approach reduces energy consumption during idle periods while ensuring reliability by periodically checking for and establishing power transfer connections when receivers are present
2Adaptability or versatility
If the system performs continuous discovery and monitoring to detect receivers and charge status, then adaptability is improved, but productivity decreases
Solution Approach 1:
The system performs preliminary discovery mode operations to detect receivers and establish coupling before initiating power transfer. This preliminary detection phase prepares the system for efficient power transfer by pre-identifying receivers and their charge needs, reducing the need for continuous monitoring during active power transfer and thereby improving overall productivity
3Power
If the transmission antenna operates at high power continuously, then power transfer capability is improved, but energy waste increases
Solution Approach 1:
The transmission controller dynamically adjusts power levels based on operational phase. During discovery mode, low power is used for scanning. During power transfer mode, high power is applied to meet transfer capability requirements. During end-of-charge mode, power is reduced or eliminated. This dynamic power adjustment maintains high power transfer capability when needed while minimizing energy waste during other phases
Solution Approach 2:
The system uses the wireless power transfer mechanism itself to communicate end-of-charge status from receiver to transmitter. The receiver modulates the wireless power signal to indicate charge completion, allowing the transmitter to automatically reduce or stop power delivery without external control, thereby eliminating energy waste while maintaining transfer capability
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
Enhances energy efficiency by minimizing power consumption and optimizing energy use before, during, and after power transfer, while maintaining user experience.
Implementation Method 1
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Implementation Method 2
magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Implementation Method 3
The rectifier is configured to (i) receive the received AC signals, (ii) convert the received AC signals to rectified DC power, and (iii) output the rectified DC power
Data Source
AI summary
A method of operating a wireless transmission system includes (i) initiating a discovery mode for the wireless transmission system, (ii) determining if at least one other system is couplable with the wireless transmission system during the discovery mode, (iii) if at least one other system is couplable with the wireless transmission system during the discovery mode, operating in a power transfer mode, (iv) during the power transfer mode, determining if a load associated with the at least one other system is in an end-of-charge state, and (v) if the load associated with the at least one other system is in the end-of-charge state, operating in an end-of-charge mode.