Wireless Battery Sharing Duty Ratio Control for Inrush Current
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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 damage during the initiation of battery sharing, as capacitors in charging modules have varying capacities, causing excessive current flow and potential battery damage.
Innovation Solution
An electronic device with a controller and current sensor monitors the current flow during wireless charging and adjusts the power transmission duty ratio from a low initial level, gradually increasing it to prevent overcurrent and stabilize the charging process, thereby minimizing inrush currents and ensuring safe battery sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging is initiated with high power transmission duty ratio, then charging speed is improved, but inrush current increases causing battery damage risk
Solution Approach 1:
The patent applies preliminary action by initiating wireless charging with a low power transmission duty ratio (first level) before gradually increasing to the target duty ratio. This preliminary low-power phase allows the system to establish stable communication and power transfer conditions, preventing inrush current from damaging the battery while still enabling charging functionality to begin operation.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the power transmission duty ratio over time during the charging process. The controller transitions from a static low duty ratio at initialization to a dynamic adjustment phase where the duty ratio increases to the target level based on monitored current values and communication status, optimizing both charging speed and safety throughout the charging cycle.
2Loss of energy
If power transmission duty ratio is increased to prevent power loss, then energy efficiency is improved, but current instability increases
Solution Approach 1:
The patent applies feedback by continuously monitoring the current value during wireless charging and using this information to control adjustments to the power transmission duty ratio. The controller receives current feedback, evaluates whether the current is stable and within safe ranges, and accordingly determines whether to increase the duty ratio to reduce power loss or maintain/ decrease it to preserve current stability.
3Reliability
If gradual duty ratio increase is implemented to stabilize current, then battery safety is improved, but charging time increases
Solution Approach 1:
The patent applies partial action by implementing a gradual duty ratio increase strategy that balances battery safety with charging efficiency. Rather than immediately applying the maximum duty ratio, the system partially increases the duty ratio in controlled steps based on current stability and communication status, achieving sufficient charging speed while maintaining battery safety through monitored incremental adjustments.
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 effectively reduces the risk of battery damage and power loss by controlling the duty ratio during the initial stages of wireless charging, ensuring stable and efficient power transmission and sharing between devices.
Implementation Method 1
a transmission coil, configured to wirelessly transmit power to an external electronic device
Data Source
AI summary
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 electric device used to provide the power to the second electronic device; and the first electronic device controlling the power transmission duty ratio according to the monitored current value.