Power Management System for USB Hub Boot Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When connecting a USB hub to a computing device, the operating system often fails to recognize the USB hub ports if the hub is powered before the OS has fully booted, especially with larger numbers of ports.
Innovation Solution
A power management system that automatically keeps the USB hub powered off until the operating system boot is complete, using a power relay unit and a microcontroller to communicate with the computing device and supply power only after the OS has finished booting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the USB hub is powered on before the operating system boot is complete, then the USB hub can be used immediately after boot, but the operating system fails to recognize the USB hub ports
Solution Approach 1:
The power management system performs preliminary action by delaying the power supply to the USB hub until after the operating system boot is complete. The system monitors the OS boot status and only enables power to the USB hub when the boot process has finished, ensuring the OS can properly detect and recognize all USB ports without recognition failures.
2Reliability
If the USB hub is powered off until OS boot is complete, then the OS recognizes all USB ports properly, but the USB hub cannot be used during boot process
Solution Approach 1:
The power management system implements feedback by continuously monitoring the OS boot status and automatically adjusting the power supply state of the USB hub accordingly. When the OS boot is detected as complete, the system automatically enables power to the USB hub, ensuring both proper recognition and timely availability without manual intervention.
3Adaptability or versatility
If power is supplied to USB hub with many ports, then all ports can potentially be recognized, but recognition failure rate increases with number of ports
Solution Approach 1:
The system applies preliminary action by ensuring the operating system is fully booted and ready to handle device enumeration before power is supplied to the USB hub. This preliminary preparation of the OS ensures that even with a large number of ports (e.g., 128 ports), the system is ready to properly detect and recognize each endpoint, preventing recognition failures that would occur with premature power supply.
Data Source
AI summary
Disclosed are a method and apparatus in which a power management system automatically maintains a USB powered off while the booting of a computing device is incomplete and only supplies power to the USB hub after the OS boot has completed. This is accomplished by the power management system communicating with the computing device receiving a signal indicating the status of the OS boot. Based on the received signal, the power management system determines whether or not to signal a power relay to supply power to the USB hub.