Magnetic Alignment Sensing for Robust Qi Power Transfer
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving optimal alignment between transmitters and receivers, limiting the ability to transfer higher power levels efficiently.
Innovation Solution
The implementation of alignment accessories, such as magnetic cases with strategically positioned magnets, and sensors like Hall Effect sensors or NFC tags, to detect precise alignment and enable a more robust wireless power transfer profile, such as the Magnetic Power Profile (MPP), by adjusting power transfer settings based on alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transfer systems use higher power levels for faster charging, then charging speed improves, but alignment sensitivity increases making power transfer less reliable
Solution Approach 1:
The system performs preliminary alignment detection using sensors (magnetic sensors, NFC, cameras) before initiating high-power wireless charging. This preliminary action ensures proper device alignment is achieved and confirmed before transitioning to higher power levels, preventing power transfer interruptions and improving reliability while maintaining fast charging capability
2Device complexity
If wireless power transfer systems operate without alignment accessories, then device simplicity is maintained, but alignment precision deteriorates limiting power transfer capability
Solution Approach 1:
The system introduces alignment accessories (magnetic alignment cases with magnets, NFC tags, camera-based alignment tools) as intermediary components that facilitate precise alignment detection. These accessories act as mediators between the transmitter and receiver, enabling the system to achieve high alignment precision and access robust power profiles without fundamentally complicating the core wireless charging functionality
Solution Approach 2:
The alignment accessories serve multiple functions: they provide magnetic alignment guidance, contain detectable markers for sensor-based alignment detection, and can store identification information via NFC tags. This multi-functionality allows a single accessory to enhance alignment precision across different detection methods without requiring multiple separate components
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 wireless power transfer efficiency by enabling higher power levels and improved alignment, allowing devices to negotiate more robust power profiles like MPP, even in systems lacking built-in alignment features.
Implementation Method 1
detecting one or more magnets of the alignment accessory using one or more magnetic sensors
Implementation Method 2
The one or more magnetic sensors can include a Hall Effect sensor
Implementation Method 3
Detecting presence or absence of the alignment accessory using one or more NFC pollers or readers
Implementation Method 4
alignment accessories, such as magnetic cases with strategically positioned magnets
Data Source
AI summary
Detecting an alignment accessory in a wireless power transfer (WPT) system and initiating a more robust WPT profile in response thereto can include detecting presence or absence of the alignment accessory using one or more sensors; and, responsive to the presence of the alignment accessory, enabling more robust WPT profile flag; or, responsive to the absence of the alignment accessory disabling the more robust WPT profile flag. Detecting alignment between a wireless power transmitter (PTx) and a wireless power receiver (PRx) and initiating more robust WPT profile in response thereto can include detecting alignment of the PTx and PRx; and responsive to the alignment being within a predetermined level, enabling more the robust WPT profile; or responsive to the alignment being greater than the predetermined level, disabling more robust WPT profile. The more robust WPT profile can be a magnetic power profile (MPP) from a Wireless Power Consortium Qi standard.