USB Charging Current Control for Device Recognition
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Solution Overview
Problem
Existing electronic device charging systems via USB interfaces face challenges in balancing high current charging for quick charging with maintaining device recognition, as excessive current can prevent the computer from recognizing the device.
Innovation Solution
A charging system with modules to determine battery voltage and current, adjusting the charging current based on predefined values and threshold voltages to ensure efficient charging while maintaining device recognition, utilizing a determination module, detection module, and control module to manage electric current and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large electric current is used for charging, then charging speed is improved, but device recognition by computer deteriorates
Solution Approach 1:
The charging system dynamically adjusts the charging current based on real-time detection of device recognition status. The control module monitors whether the computer recognizes the electronic device and automatically modulates the charging current accordingly, transitioning from a static current approach to a dynamic adaptive one that resolves the contradiction between fast charging and device recognition.
Solution Approach 2:
The system implements a feedback mechanism where the detection module continuously monitors the recognition status of the electronic device by the computer. This feedback information is fed back to the control module, which adjusts the charging current in response to the recognition status, creating a closed-loop control system that balances charging speed and device recognition.
2Productivity
If high current charging is applied, then charging efficiency is improved, but system stability deteriorates
Solution Approach 1:
The charging current is transformed from a fixed high-value setting to a dynamically adjustable parameter. The control module continuously adapts the current level based on system conditions, particularly device recognition status, allowing the system to operate at high efficiency when stable and reduce current when instability is detected, thus resolving the contradiction between charging efficiency and system stability.
Solution Approach 2:
The detection module proactively monitors system conditions before instability occurs. By detecting early signs of recognition loss or system instability, the system can preemptively adjust the charging current to prevent complete system failure, cushioning against potential instability rather than reacting after it occurs.
Data Source
AI summary
An electronic device which is able to be charged via a universal serial bus (USB) interface which connects to a computer. A first voltage of a battery of the electronic device, a second voltage and an electric current of the USB interface are determined. If a difference between the first voltage and a saturation voltage of the battery is greater than a predefined value, the electronic device is charged with a first electric current. If the second voltage is not lower than a threshold voltage and the electric current of the USB interface is not lower than the electrical energy consumption of the electronic device, the first electric current is decreased.