Wireless Charging Pad Fringe Power for Misplaced Device Error Indication
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Solution Overview
Problem
Wireless charging systems often fail to provide power above a minimum threshold due to improper device placement, leading to incomplete charging and lack of feedback to the user, especially when the device's battery is depleted and cannot indicate errors.
Innovation Solution
The system determines if the device is placed incorrectly on the charging pad by calculating the power ratio and requests fringe power to indicate errors visually or audibly, allowing continued power delivery even below the minimum threshold, enabling the device to alert the user of issues without sufficient battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wireless charging pad requires proper device placement to provide power above minimum threshold, then charging efficiency is improved, but device placement flexibility deteriorates
Solution Approach 1:
The system implements two power delivery modes: full power mode for proper placement and fringe power mode for suboptimal placement. Instead of completely shutting off power when placement is incorrect, the system provides partial power (fringe power) that enables basic error indication functions, thus maintaining some charging action even when optimal placement is not achieved.
Solution Approach 2:
The system dynamically changes the power delivery parameter based on device placement quality. When improper placement is detected, the system transitions from providing full power above minimum threshold to providing reduced fringe power, thereby adapting the power parameter to the actual placement condition while still enabling error feedback.
2Reliability
If the wireless charging pad shuts off power when placement is incorrect, then power safety is improved, but user feedback capability deteriorates
Solution Approach 1:
Instead of completely shutting off power when placement is incorrect, the system provides partial fringe power that is sufficient for error indication but insufficient for full charging operations. This partial action maintains safety while preserving the ability to communicate errors to the user through visual or audible indicators.
Solution Approach 2:
The system implements a feedback mechanism where fringe power enables error indicators (visual LED or audible alarm) to communicate placement issues to the user. The feedback loop allows the system to detect improper placement and inform the user, creating a closed-loop control system that improves overall reliability through user awareness.
3Use of energy by moving object
If the device battery is depleted, then power conservation is improved, but error indication capability deteriorates
Solution Approach 1:
The wireless charging pad acts as an intermediary that provides fringe power specifically for error indication when the device battery is depleted. Instead of relying on the depleted device battery to power error indicators, the charging pad supplies the necessary power through its fringe power capability, enabling error communication without draining device battery resources.
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 allows for increased placement flexibility and continued power delivery, enabling the device to alert users of errors or suboptimal positioning, ensuring user awareness and preventing complete power shutdown.
Implementation Method 1
The wireless power delivery system can then wirelessly transmit power to the IHS, for example, to charge an internal battery of the IHS
Data Source
AI summary
Systems and methods for free device placement for wireless charging are described. In some embodiments, an Information Handling System (IHS) may include a processor; and a memory coupled to the processor, the memory having program instructions stored thereon that, upon execution by the processor, cause the IHS to: determine that the IHS is placed in a position on a wireless charging pad such that the wireless charging pad cannot provide power to the IHS above a minimum threshold value; request that the wireless charging pad provide fringe power to IHS without repositioning the IHS on the wireless charging pad, wherein the fringe power is smaller than the minimum threshold power level; and use the fringe power to indicate a problem or error to a user.