Detection Resistor Charging Control for Peripheral Circuit Safety
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Solution Overview
Problem
Current mobile terminal charging technologies fail to effectively detect and prevent short-circuiting or electric leakage in peripheral circuits, such as USB connectors, which can lead to unsafe charging conditions, including fires and personal injuries.
Innovation Solution
A charging control method and power adapter system that includes detection resistors to monitor charging currents and voltage, allowing the mobile terminal to detect abnormal conditions and send control information to stop charging when anomalies are detected, thereby preventing accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charging protection methods (over-temperature, over-current, over-charge protection) are used, then battery and charging chip safety is improved, but detection of short-circuiting or electric leakage in peripheral circuits (USB connector, ESD protection, surge protection circuit) is not achieved
Solution Approach 1:
The patent segments the charging system into multiple protection zones: battery protection, charging chip protection, and peripheral circuit protection. By adding detection resistors at different locations (power adapter output end and mobile terminal charging peripheral circuit), the system achieves segmented monitoring of different circuit sections, enabling independent detection of short-circuiting or electric leakage in peripheral circuits without affecting battery or charging chip protection.
Solution Approach 2:
The patent introduces detection resistors as intermediary elements in the charging circuit. These resistors are arranged in series with the charging current path and serve as mediators to detect abnormal conditions (short-circuiting or electric leakage) by monitoring voltage changes across them. The detection resistors convert electrical parameters into detectable signals without significantly affecting the charging process.
2Measurement precision
If detection resistors are added to monitor charging currents and voltage, then detection of abnormal conditions in peripheral circuits is improved, but device complexity increases
Solution Approach 1:
The detection resistors serve multiple functions: they detect short-circuiting, detect electric leakage, and provide voltage reference signals for the control circuit. The same detection resistor arrangement is used in both the power adapter and the mobile terminal, making the detection mechanism universal across different charging scenarios and reducing the need for separate detection circuits.
Solution Approach 2:
The detection resistors automatically detect abnormal conditions through their inherent electrical properties (voltage drop across the resistor). When short-circuiting or electric leakage occurs, the voltage change across the detection resistor self-indicates the fault condition, eliminating the need for additional active sensing components or complex detection algorithms in the peripheral circuits.
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 system effectively detects and prevents short-circuiting or electric leakage in peripheral circuits, ensuring safe charging operations and avoiding potential hazards like fires and economic losses.
Implementation Method 1
obtaining a resistance value of the detection resistor corresponding to the charging mode and voltage values at two ends of the detection resistor
Data Source
AI summary
The present disclosure relates to a charging control method, including: arranging at least one detection resistor corresponding to charging mode at an output end of a power adapter; determining the charging mode; obtaining a resistance value of the detection resistor corresponding to the charging mode and voltage values at two ends of the detection resistor according to the determined charging mode, and sending the voltage values and the resistance value of the detection resistor to a mobile terminal; and stopping charging when control information for stopping the charging sent by the mobile terminal is received. The present disclosure further relates to a power adapter and a mobile terminal.