Adaptive Charging Current Control for Adaptor Protection
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Solution Overview
Problem
Existing charging methods for portable electronic devices cannot adaptively set charging currents based on the electrical characteristics of different adaptors, leading to inefficient charging or potential damage from excessive current.
Innovation Solution
A charging current setting method and module that detects input voltage and calculates input resistance to determine a lower limit voltage and upper limit current, allowing for adaptive charging current adjustment to match the adaptor's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a larger charging current is used to increase charging speed, then charging efficiency is improved, but the risk of damaging the adaptor or charging module increases
Solution Approach 1:
The charging module performs preliminary detection of the adaptor's output current capability before initiating charging. By measuring the voltage across a known resistance in the input terminal and calculating the current using Ohm's law, the system determines the maximum safe charging current in advance, preventing overload damage while enabling optimal charging speed.
2Reliability
If a lower charging current is used to ensure safety, then damage risk is reduced, but charging time increases
Solution Approach 1:
The system performs preliminary detection of the adaptor's output current capability before charging. By measuring voltage across a known resistance and calculating current, it determines the maximum safe charging current in advance, enabling the use of the highest safe current throughout charging to minimize time while ensuring safety.
Solution Approach 2:
The charging current is dynamically adjusted based on the detected adaptor capability. The system transitions from a static predetermined current mode to a dynamic mode where the charging current adapts to the specific adaptor's loading capability, optimizing both safety and charging speed for each charging scenario.
3Ease of operation
If a predetermined charging current mode is used, then the charging module is simple to operate, but it cannot adapt to different adaptor loading capabilities
Solution Approach 1:
The charging module automatically detects the adaptor's output current capability and self-adjusts the charging current without user intervention. The system measures voltage across an internal resistance, calculates the adaptor's current capability, and autonomously sets the optimal charging current, maintaining ease of operation while achieving high adaptability.
Solution Approach 2:
The charging current parameter is dynamically changed based on detected adaptor characteristics. The system varies the charging current according to the measured voltage and calculated current capability of different adaptors, enabling universal compatibility while maintaining simple operation for the user.
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
Enables optimal charging current determination, preventing excessive current that could damage the adaptor or prolong charging time, while ensuring efficient charging by matching the charging current to the adaptor's capacity.
Implementation Method 1
detecting at least one voltage value of an input voltage signal in an input terminal of the charging module to calculate an input resistance
Implementation Method 2
controlling an input current to increase, so that the input voltage signal decreases in accordance with the increasing input current
Data Source
AI summary
A charging current setting method for a charging module includes detecting at least two voltage values associated with two input current values of an input voltage signal at an input terminal of the charging module to calculate an input resistance; setting a lower limit voltage value of the input voltage signal according to the input resistance; controlling an input current to increase its magnitude, so that voltage level of the input voltage signal decreases in accordance with increasing level of the input current; controlling the input voltage signal to remain on the lower limit voltage value when the input voltage signal is decreasing and reaches the lower limit voltage value, and recording a magnitude of the input current as an upper limit current value when the input voltage signal is on the lower limit voltage value and the input current becomes stable; and determining a charging current value of the charging module according to the upper limit current value.