Charging Port Attach-Detach Regulation via Current Limiting
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Solution Overview
Problem
Electronic devices experience rapid attach/detach cycles and fail to charge when connected to a charging port that cannot supply the required current, leading to a poor user experience and potential catastrophic shutdown.
Innovation Solution
A method and system for regulating charging port attach and detach by automatically detecting detach events, lowering the current limit, and initiating a wait period during which if an attach is detected, the charging continues at the lower limit, and if not, a detach process is initiated, thereby preventing continuous cycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electronic device draws current in excess of what can be supplied by the charging port, then the device can operate at higher power, but the charging port shuts off output power entirely causing rapid attach/detach cycles
Solution Approach 1:
The device performs preliminary actions by detecting detach events and lowering the current limit before a potential reconnect occurs. This proactive current limit reduction prevents the charging port from shutting off power again, avoiding the rapid attach/detach cycle and ensuring stable charging operation.
2Object-affected harmful factors
If the charging port shuts off output power entirely when current exceeds the limit, then the charging port protects itself from overload, but the device experiences rapid attach/detach cycles and fails to charge
Solution Approach 1:
The device implements a feedback mechanism by monitoring charging port status and dynamically adjusting the current limit based on detected events. When a detach is detected, the device lowers the current limit and maintains this reduced limit during a wait period, creating a feedback loop that prevents the charging port from shutting off power and ensures continuous charging operation.
3Duration of action of moving object
If the device continuously experiences attach/detach cycles, then the device attempts to maintain charging operation, but the device ultimately experiences catastrophic shutdown
Solution Approach 1:
The device performs preliminary protective actions by detecting detach events and proactively lowering the current limit before catastrophic shutdown can occur. This preemptive current reduction stabilizes the charging operation and prevents the device from experiencing repeated attach/detach cycles that would lead to shutdown.
Data Source
AI summary
Methods and systems for regulating charging port attach and detach in an electronic device configured to receive a charging current from a charging port are provided. An example method includes automatically detecting a detach from the charging port. The method may further include automatically lowering a current limit associated with the charging current. The method may further include if during a predetermined wait time an attach to the charging port is detected, then ignoring the detach from the charging port and allowing the charging current to charge the electronic device at the lower current limit associated with the charging current. The method may further include if during the predetermined wait time the attach to the charging port is not detected, then initiating a charging port detach process.