Mobile Terminal DC Charging Adaptation via UART Pin Detection
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Solution Overview
Problem
Existing mobile terminals require frequent charging due to limited battery capacity and inflexible charging methods, with standard charging schemes taking long periods and not optimizing charging voltage according to battery state.
Innovation Solution
A mobile terminal and DC-charging power source adaptor system that automatically identifies the charging device through USB and UART communication, dynamically adjusts charging voltage based on battery state, and switches between normal and rapid charging modes to optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If standard DCP charging scheme with fixed voltage output is used, then charging compatibility is maintained, but charging time becomes long (3-4 hours)
Solution Approach 1:
The charging adaptor dynamically adjusts output voltage based on battery state. The controller detects battery voltage and automatically switches between multiple voltage levels (5V, 9V, 12V) to optimize charging speed at different charging stages, resolving the contradiction between fixed voltage compatibility and dynamic charging performance
Solution Approach 2:
The system changes charging voltage parameters according to battery state. By detecting battery voltage thresholds and adjusting output voltage accordingly, the system achieves both compatibility (supporting standard voltages) and optimized charging time through parameter adaptation
2Reliability
If USB communication protocol is used for device identification, then communication compatibility is maintained, but identification reliability fails when USB communication is unavailable
Solution Approach 1:
The patent introduces an intermediary identification mechanism using differential data pin shorting detection as a preliminary check before USB communication. This intermediary step provides a reliable fallback method to identify DC charging adaptors when USB communication fails, enhancing identification reliability without significantly increasing system complexity
3Ease of operation
If battery charging is performed frequently due to limited capacity, then battery capacity constraints are acknowledged, but user convenience deteriorates
Solution Approach 1:
The system performs preliminary detection of battery voltage state before initiating charging. By detecting whether battery voltage is below threshold and automatically starting optimized DC charging when needed, the system reduces the frequency of manual charging operations, improving user convenience despite limited battery capacity
Data Source
AI summary
This disclosure provides a mobile terminal, a DC-charging power source adaptor, and a charging method, where firstly the DC-charging power source adaptor is configured to communicate with the mobile terminal in a UART communication mode, and then a strategy to identity the type of charging is designed in the mobile terminal dependent upon configuration of communication pins of a different charging device, so that the mobile terminal identifies automatically the type of the external device. Also a specialized rapid charging mode is designed for the DC-charging power source adaptor, the battery of the mobile terminal being charged is DC-charged at large current by charging voltage output by the DC-charging power source adaptor, and the volt value of the charging voltage is adjusted dynamically according to the varying voltage of the battery.