Wireless Charging Duty Ratio Control for Inrush Current Limiting
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Solution Overview
Problem
Wireless charging of electronic devices faces challenges with inrush currents that can lead to power loss and potential battery damage due to varying capacitor capacities, especially when starting battery sharing functions.
Innovation Solution
An electronic device is configured with a controller that monitors current values and adjusts the power transmission duty ratio, starting with a low level and gradually increasing it to prevent excessive current flow, thereby stabilizing the battery sharing function and preventing battery damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging mode is activated with high power transmission duty ratio, then charging speed is improved, but inrush current increases causing battery damage risk
Solution Approach 1:
The system performs preliminary detection of the external device and pre-sets an initial power transmission duty ratio before full charging begins. This preliminary action prevents inrush current by establishing a controlled starting state, then gradually increases power transmission after detection confirms safe operating conditions.
Solution Approach 2:
The power transmission duty ratio is dynamically adjusted based on real-time current monitoring. The system transitions from a fixed high duty ratio to a dynamic control mode where the duty ratio changes according to monitored current values, enabling both fast charging and inrush current prevention through adaptive adjustment.
2Productivity
If power transmission duty ratio is increased for faster charging, then charging efficiency is improved, but current control stability deteriorates
Solution Approach 1:
The system implements continuous feedback monitoring of current values during wireless charging. The monitored current information is fed back to the controller, which adjusts the power transmission duty ratio accordingly. This closed-loop feedback mechanism maintains current control stability even at high power transmission levels, preventing both inrush current and overheating.
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 approach effectively controls inrush currents, stabilizes power transmission, and prevents battery damage by managing the power transmission duty ratio, ensuring safe and efficient wireless charging.
Implementation Method 1
a transmission coil, configured to wirelessly transmit power to an external electronic device
Data Source
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AI summary
Provided are an electronic device, a wireless charging method, and a non-transitory computer-readable medium. A method for wirelessly charging an electronic device includes entering, by a first electronic device a wireless charging mode upon determining that a second electronic device is accessing the first electronic device; the first electronic device setting a power transmission duty ratio of the first electronic device at a first level; the first electronic device wirelessly supplying power to the second electronic device at the power transmission duty ratio; the first electronic device monitoring a current value of the first electronic device used to supply the power to the second electronic device; and the first electronic device controlling the power transmission duty ratio according to the monitored current value.