Wireless Charging Current Control Near Cutoff Voltage
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Solution Overview
Problem
Wireless charging systems face interruptions due to poor coil coupling performance, leading to unstable charging and inefficiencies, especially when using low-power modes like Qi BPP or Qi EPP, as they are prone to interrupting when the input voltage drops below a cutoff threshold.
Innovation Solution
A wireless charging control method that dynamically polls and adjusts the input current and voltage during the charging process, maintaining the current and voltage when the input voltage approaches a preset threshold, preventing further increases that could cause interruption, and continuing the charging process with the present input current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the input current is increased to improve charging power, then charging efficiency is improved, but the input voltage drops below the cutoff threshold causing charging interruption
Solution Approach 1:
The patent implements dynamic adjustment of input current based on real-time monitoring of input voltage. When voltage approaches the cutoff threshold, the system dynamically reduces current to prevent interruption, and when voltage is sufficient, it increases current to maximize charging efficiency. This dynamic control resolves the contradiction between maintaining high charging efficiency and preventing charging interruption.
Solution Approach 2:
The system continuously monitors input voltage and uses this feedback to adjust the input current. The feedback loop detects when voltage drops near the cutoff threshold and automatically reduces current to maintain stable charging, thereby preventing interruptions while optimizing charging efficiency based on real-time conditions.
2Reliability
If the input current is limited to prevent voltage drop, then charging stability is maintained, but charging efficiency decreases
Solution Approach 1:
Instead of using a fixed current limit, the system dynamically adjusts the current based on real-time voltage conditions. When voltage is high, current can be increased to maximize efficiency; when voltage approaches the cutoff threshold, current is reduced to maintain stability. This dynamic approach resolves the contradiction by allowing high efficiency when conditions permit while ensuring stability when needed.
Solution Approach 2:
The system changes the operating parameters (input current) based on the state of another parameter (input voltage). By continuously adjusting current according to voltage levels, the system optimizes charging efficiency during favorable conditions while preventing interruptions during unfavorable conditions, thus resolving the stability-efficiency trade-off.
3Reliability
If the charging protocol uses strict voltage thresholds to prevent interruption, then charging reliability is improved, but charging effectiveness decreases due to frequent interruptions
Solution Approach 1:
The system takes preliminary action by proactively reducing input current when voltage approaches the cutoff threshold, before the voltage actually drops below it. This preventive measure avoids charging interruptions entirely, maintaining both reliability and effectiveness. The system acts in advance to prevent the harmful condition rather than reacting after interruption occurs.
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 ensures stable and effective wireless charging even with poor coil coupling, reducing the risk of interruption and improving the overall effectiveness and stability of the charging process.
Implementation Method 1
wireless charging process performed between an electronic apparatus and a wireless charger
Data Source
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AI summary
A wireless charging control method includes: polling and detecting a present input current and a present input voltage in a wireless charging process performed between an electronic apparatus and a wireless charger; and performing wireless charging with the present input current and the present input voltage in response to the present input voltage being less than a preset threshold voltage, in which the preset threshold voltage is greater than a cutoff voltage, and the cutoff voltage represents a lower limit voltage for interrupting the wireless charging process.