Wireless Power Receiver Current Limit Control
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Solution Overview
Problem
Wireless charging stability is precarious compared to wired charging, often resulting in power transmission disconnections due to abrupt current changes, unstable environments, and Foreign Object Detection errors.
Innovation Solution
A wireless power reception device and method that control the input current limit of an embedded charger to stabilize wireless charging by gradually adjusting the current limit, preventing abrupt changes and ensuring continuous power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging is implemented to eliminate exposed contact terminals, then waterproof functionality and ease of operation are improved, but power stability and reliability deteriorate due to abrupt current changes and transmission disconnections
Solution Approach 1:
The patent implements dynamic adjustment of the input current limit based on real-time charging conditions. The controller monitors charging status and adjusts the current limit parameter dynamically to prevent abrupt changes that cause transmission disconnections, thereby maintaining power stability while preserving the wireless charging convenience and waterproof functionality
Solution Approach 2:
The patent changes the electrical parameter (input current limit) of the charger to stabilize wireless charging. By adjusting this parameter based on charging conditions, the system prevents power transmission disconnections and maintains reliable power delivery, resolving the contradiction between wireless charging convenience and power stability
2Productivity
If the input current limit of the charger is increased to improve charging speed, then productivity is improved, but power stability deteriorates due to abrupt current changes causing transmission disconnections
Solution Approach 1:
The system dynamically adjusts the input current limit based on real-time monitoring of wireless power transmission conditions. When transmission is stable, the current limit can be higher for faster charging; when instability is detected, the limit is reduced to maintain connection, thus balancing charging speed with power stability
Solution Approach 2:
The controller implements feedback control by monitoring charging conditions and adjusting the input current limit accordingly. This closed-loop control prevents abrupt current changes that would cause disconnections, allowing the system to maintain both high charging speed and stable power transmission
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
The solution enhances the stability of wireless charging by preventing disconnections and maintaining consistent power transmission, even in unstable conditions or during full charge, thereby improving overall charging reliability.
Implementation Method 1
Wireless charging technology may be based on electromagnetic induction using a coil
Implementation Method 2
Wireless charging technology may be based on electromagnetic induction using a coil, electric resonance
Implementation Method 3
a system in which a battery can be automatically charged when a portable phone is not physically connected to a separate charging apparatus by wire
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A reception device for receiving wireless power may include: a power reception circuit configured to wirelessly receive power from a transmission device, rectify the received power, and output the rectified power; a charger configured to process the rectified power received from the power reception circuit and charge a battery of the reception device or output the rectified power to a system of the reception device; and a control circuit configured to, when an event for changing an input current limit of the charger is detected, gradually change the input current limit of the charger by stepping up or stepping down the input current limit to one or more intermediary values until the input current limit reaches a predetermined value.