Mobile Device Wireless Charging Stand Repositioning Alert
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Solution Overview
Problem
Wireless power supply systems, such as those conforming to the Qi standard, lack a protocol for automatically restarting charging once a mobile device's battery is fully charged, leading to potential battery depletion if the device is not manually repositioned on the charging stand.
Innovation Solution
A mobile device equipped with a sensor, like a magnetic sensor, to detect movement from the charging stand after an End of Power Transfer packet is transmitted, and a notifying unit to alert the user to reposition the device for continued charging, preventing battery depletion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless power supply follows the Qi standard protocol, then power transmission efficiency is improved, but automatic restart capability after charging completion is lost
Solution Approach 1:
The power transmitter detects the presence of the power receiver using feedback signals (analog ping or digital packet exchange) and automatically restarts power transmission when the receiver is detected again after charging completion, creating a closed-loop control system that maintains reliable operation
2Duration of action of stationary object
If the mobile device remains on the charging stand after battery full charge, then charging continuity is maintained, but battery depletion occurs due to lack of protocol for automatic restart
Solution Approach 1:
The system continuously monitors the charging state through packet exchange between transmitter and receiver. When the battery is fully charged, the transmitter stops power transmission. If the device remains on the stand, the transmitter detects the receiver's presence through analog ping or packet response and automatically restarts charging, ensuring continuous power supply without battery depletion
3Device complexity
If manual repositioning is required to restart charging, then system complexity is reduced, but user convenience deteriorates
Solution Approach 1:
The wireless power supply system automatically detects when the mobile device is placed on the charging stand and initiates power transmission without requiring user intervention. The system monitors charging status and automatically restarts when needed, making the charging process self-service and highly convenient for users
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
Ensures continuous charging by alerting the user to reposition the device after charging completion, thereby preventing battery drain and maintaining device functionality.
Implementation Method 1
A wireless power supply that conforms to the Qi standard makes use of electromagnetic induction between a transmission coil and a reception coil
Implementation Method 2
The control signal S3 is transmitted from a reception coil 32 (secondary coil) to the transmission coil 22 in the form of an AM (Amplitude Modulation) modulated signal using backscatter modulation
Data Source
AI summary
A mobile device is configured such that it can be charged using an electric power signal S2 received from a wireless power transmitter. A wireless power receiver receives the electric power signal S2. A charger circuit charges a secondary battery using the electric power received by the wireless power receiver. A sensor detects whether or not the mobile device has been moved from a charging stand after the wireless power receiver transmits, to the wireless power transmitter, an EPT (End of Power Transfer) packet that indicates that charging of the secondary battery has been completed.