Wireless Power Transfer Control via Source Capability Feedback
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Solution Overview
Problem
Current wireless power transfer systems fail to distinguish between different power capabilities of input sources, leading to inefficiencies and system inoperability when powered from sources with lower output, such as USB ports, which provide less power than wall adapters.
Innovation Solution
A system and method that uses a signal generator to communicate power source capabilities to the secondary side of the wireless power transfer system through pulse duration, allowing adjustments in power output to match available power, preventing system collapse and ensuring operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless charging pad operates from a USB port with lower power output, then the system can be powered from more diverse sources, but the system becomes inoperable because the remote part attempts to draw nominal load current despite limited input power
Solution Approach 1:
The system incorporates a communication channel between the primary and secondary sides that enables the primary side to transmit power capability information to the secondary side. The secondary side receives this feedback and adjusts its power draw accordingly, preventing system inoperability when powered from limited sources like USB ports.
Solution Approach 2:
The system dynamically adjusts the power draw based on the detected power source capabilities. Rather than operating at a fixed nominal load current, the secondary side modulates its power consumption according to the real-time power availability communicated from the primary side, enabling stable operation across diverse power sources.
2Power
If the wireless charging pad is designed for wall adapter power input, then adequate power is available for charging, but the system cannot operate from lower power sources like USB ports
Solution Approach 1:
The system is designed to universally accept multiple power source types (wall adapters, USB ports, renewable energy sources) by incorporating detection and communication mechanisms that identify the power source capabilities and adjust operation accordingly, enabling a single system to function across diverse power inputs.
Solution Approach 2:
The system changes its operational parameters based on the detected power source characteristics. When a USB port is detected, the system adjusts its power consumption parameters to match the lower power availability, whereas with a wall adapter, it operates at higher power levels, thus adapting to different power inputs.
3Device complexity
If the remote part draws nominal load current without power capability communication, then the system design is simple, but the system fails to operate when powered from limited power sources
Solution Approach 1:
The system introduces an intermediary communication channel that transmits power capability information from the primary to the secondary side. This intermediary mechanism enables coordinated power transfer by allowing the secondary side to understand and adapt to the primary side's power capabilities, ensuring stable operation.
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
Enables the wireless power transfer system to adjust its power output based on the identified power source capabilities, maintaining operational efficiency even with lower power inputs, thereby preventing system failures and ensuring safe and effective charging.
Implementation Method 1
Wireless charging pads make use of electrodynamic induction, and are a common method of successfully transferring energy without the use of wires
Data Source
AI summary
The present invention employs system and method in for distinguishing between power capabilities of various external power sources and a system that can communicate the identified power capabilities to the secondary side of the wireless power transfer system. Once the secondary side of the wireless power transfer system receives the power capability information, it adjusts the current available for a payload in accordance with the information received on power source capabilities.