OTG Voltage Stabilization via Dynamic Current Limiting
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Solution Overview
Problem
Existing OTG technologies face instability in voltage during charging, leading to interference and potential crashes of OTG peripheral devices, especially during critical operations like formatting USB flash disks, due to fluctuations in current and voltage changes in the OTG cable.
Innovation Solution
A method for a mobile terminal to monitor and stabilize voltage changes in OTG cables by counting differences in voltage between data lines, querying a lookup table to set a current limit based on accumulated changes, ensuring stable voltage delivery during charging and critical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the mobile terminal charges the OTG peripheral device, then the OTG peripheral device receives power, but voltage changes in the cable cause current fluctuations that interfere with OTG operations
Solution Approach 1:
The patent implements dynamic current limiting by continuously monitoring voltage changes on data lines and adjusting the current limit accordingly. The controller dynamically switches between different current limit values (first current limit when voltage is stable, second current limit when voltage changes) to maintain stable OTG operations while charging, resolving the contradiction between charging capability and operational stability.
2Ease of operation
If the mobile terminal automatically charges the OTG peripheral device upon connection, then charging is convenient, but voltage stability cannot be guaranteed during critical operations
Solution Approach 1:
The patent employs feedback control by monitoring voltage changes on data lines during OTG operations and using this information to adjust the current limit. The controller detects voltage fluctuations and responds by switching current limit values, creating a closed-loop control system that maintains voltage stability while preserving automatic charging functionality.
3Power
If current changes during charging, then power delivery is flexible, but voltage changes in the cable cause interference to critical OTG operations
Solution Approach 1:
The patent changes the electrical parameter (current limit) based on the operational state. By switching between different current limit values depending on whether voltage changes are detected, the system maintains flexible power delivery while eliminating harmful voltage fluctuations that cause interference to OTG operations.
Data Source
AI summary
A mobile terminal, an on-the-go (OTG) control and configuration method, and a storage medium, wherein the method includes: obtaining an accumulated number of changes of differences in voltages of at least one of a positive data line and a negative data line in an OTG data cable at intervals; according to the accumulated number of changes of the differences in the voltages of at least one of the positive data line and the negative data line in the OTG cable, querying a lookup table pre-stored in the mobile terminal for a current value corresponding to the number of changes; and according to the queried current value, controlling the mobile terminal to set the current value as a current limit for an OTG peripheral device.