USB Power Delivery Deglitch Control for Arc-Free Disconnects
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Solution Overview
Problem
In USB power delivery systems, physical disconnection can lead to potential differences causing arcs, which may result in irreversible damage to devices, and existing methods for arc prevention, such as using capacitors or monitoring voltage changes, are not always effective in reducing the risk of arcing.
Innovation Solution
The implementation of a deglitch circuit and comparator system that monitors the configuration channel for voltage changes over a determined debounce duration to detect physical disconnection and adjust the deglitch duration based on the magnitude of power transmission, thereby reducing the potential for arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical disconnection is detected using traditional voltage monitoring methods, then arc prevention is attempted, but the detection accuracy is insufficient leading to false positives or missed detections
Solution Approach 1:
The patent introduces a deglitch circuit as an intermediary component between the voltage monitor and the arc prevention control logic. This circuit filters out transient voltage fluctuations and provides stable, debounced signals that accurately represent true disconnect events, eliminating false detections while maintaining high measurement precision
Solution Approach 2:
The system performs preliminary voltage threshold comparisons and deglitch processing before triggering arc prevention measures. By pre-processing the voltage signals and establishing confirmed disconnect conditions through debounced logic, the system ensures that arc prevention is activated only when truly necessary, improving both reliability and precision
2Reliability
If arc prevention measures are activated during disconnection, then device damage is prevented, but power transfer is interrupted causing data transmission delays
Solution Approach 1:
The patent dynamically adjusts the deglitch duration based on the magnitude of power transmission. When power levels are low, shorter deglitch periods allow faster recovery and minimal transmission interruption. When power levels are high, longer deglitch periods ensure thorough arc prevention while the system gradually reduces power. This dynamic adaptation optimizes the balance between protection reliability and time loss
Solution Approach 2:
The system changes the power transmission parameter (power magnitude) in response to detected disconnect conditions and deglitch duration settings. By modulating power levels during the deglitch period and adjusting the duration itself based on power magnitude, the system minimizes transmission time loss while maintaining effective arc prevention through parameter adaptation
3Productivity
If data transmission continues during power delivery, then productivity is maintained, but the risk of arcing increases during physical disconnection
Solution Approach 1:
The patent implements feedback through continuous monitoring of configuration channel voltage levels and deglitch circuit output states. This feedback mechanism detects disconnect conditions in real-time and triggers appropriate power adjustment responses, maintaining productivity by quickly identifying and responding to disconnect events rather than continuously interrupting transmission
Solution Approach 2:
The system takes preliminary action by detecting disconnect conditions through voltage monitoring and deglitch processing before arcing can occur. This early detection allows the system to prepare for power interruption while minimizing the actual interruption time, thus maintaining productivity while reducing arcing risk through proactive rather than reactive measures
Data Source
AI summary
An example method includes determining, by a controller of a device, whether a length of transmission data is longer than a threshold and responsive to determining that the length of data is longer than the threshold, setting, by the controller a deglitch duration to a duration. The method also includes transmitting, by the device, the data, while the deglitch duration has the duration.