USB Power Bank Charging Current Control via Data Terminal Detection
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Solution Overview
Problem
External battery devices face issues with improper charging current settings due to misidentification of charger specifications, leading to potential damage from overload when the charging current exceeds the charger's maximum output current.
Innovation Solution
The external battery device includes a processor that measures the voltage value of a data terminal to recognize charger specifications and sets the charging current accordingly, and adjusts the charging current based on voltage drops during charging to prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging current is set high to charge the battery quickly, then the charging speed is improved, but the charger may be damaged due to excessive current
Solution Approach 1:
The processor measures the voltage value of the first data terminal before charging begins to identify charger specifications. This preliminary identification allows the system to pre-determine the maximum safe charging current based on the charger's capabilities, preventing overload before it occurs while enabling optimal charging speed from the start
Solution Approach 2:
The charging current is dynamically adjusted based on the measured voltage value. The processor continuously monitors the voltage and modifies the charging current in real-time according to the charger's actual output capacity, allowing the system to achieve maximum safe charging speed at each moment rather than using a fixed current limit
2Reliability
If the charging current is set low to protect the charger, then the charger safety is improved, but the charging speed decreases
Solution Approach 1:
The processor uses feedback from the voltage measurement at the first data terminal to automatically adjust the charging current. By continuously monitoring the voltage and comparing it against known specifications, the system receives real-time information about the charger's capabilities and adjusts the charging current accordingly, achieving both safety and optimal speed without manual intervention
Solution Approach 2:
The charging current parameter is changed based on the voltage value measurement. Different voltage ranges correspond to different charger types with different maximum current capabilities. The processor selects the appropriate charging current parameter matching the detected charger specification, ensuring safe operation while maximizing charging speed for each charger type
Data Source
AI summary
An external battery device includes a battery, an input terminal that receives external power from a charger connected through a universal serial bus (USB) cable, a charging unit that charges the battery, and a processor configured to measure a voltage value of a first data terminal of the input terminal, set a charging current based on the voltage value of the first data terminal, and control the charging unit to charge the battery with the charging current that is set.