Wireless Charging Capacitor Switching for Battery Level Maintenance
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Solution Overview
Problem
Conventional wireless charging systems fail to maintain a rechargeable battery at a full charge after charging is complete, leading to unnecessary power consumption and reduced device usability due to quiescent power drain, and require excessive memory for command storage and redundant power transmission operations.
Innovation Solution
A mobile device with a receiver coil, rectifier, capacitor, charger, and switch that disconnects the receiver coil when the battery is fully charged and reconnects it when the charge level falls below a threshold, allowing the charging apparatus to detect capacitance changes and initiate recharging, thereby maintaining the battery at or above a given charge level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter coil is moved to the mobile device at fixed time intervals to check charge state after charging is complete, then the rechargeable battery can be kept at full charge, but the transmitter coil will be moved unnecessarily and power consumption of the charge pad will increase
Solution Approach 1:
The mobile device monitors its own battery charge level and only activates the receiver coil when the charge level drops below a threshold, creating a feedback mechanism that eliminates unnecessary coil movements and power consumption while maintaining reliable charge level
Solution Approach 2:
The mobile device autonomously determines when recharging is needed based on its internal charge level monitoring, and actively requests charging by activating the receiver coil, rather than requiring periodic checks by the charge pad
2Adaptability or versatility
If various types of commands are defined for charging operations, then charging control functionality is improved, but memory storage volume required increases
Solution Approach 1:
The patent extracts the command storage requirement from the system by implementing direct charge level monitoring and threshold-based activation logic in the mobile device, eliminating the need for storing multiple command types in memory
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 ensures the rechargeable battery remains at or above a specified charge level, reducing unnecessary power consumption and memory requirements, while efficiently managing recharging operations.
Implementation Method 1
a receiver coil that outputs AC power received from a charging apparatus that wirelessly charges a rechargeable battery
Implementation Method 2
a rectifier that rectifies the AC power output by the receiver coil into DC power
Implementation Method 3
a capacitor disposed between the receiver coil and the rectifier
Data Source
AI summary
When the charge level of a fully-charged rechargeable battery decreases due to quiescent power drain, in order to recharge it is necessary for the user to pick up and again place the mobile device in which the rechargeable battery is inserted onto a charging apparatus and issue instructions to start recharging. To address this issue, a charging controller applies control to disconnect a capacitor from a receiver coil with a switch in the case where the charge level of a rechargeable battery is equal to or greater than a given threshold value, and additionally applies control to connect the capacitor to the receiver coil with the switch in the case where the charge level of the rechargeable battery is less than the threshold value.