Device Policy Manager Power Allocation for Non-USB PD Devices
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Solution Overview
Problem
USB systems face inefficiencies in power management when connected devices do not support USB Power Delivery (USB PD), leading to suboptimal power allocation and prolonged charging times for devices that could utilize higher power levels.
Innovation Solution
The implementation of a system that enhances the Device Policy Manager (DPM) to extract power requirements from USB configuration descriptors, allowing for dynamic adjustment of power allotment to devices based on their actual needs, even if they do not support USB PD, thereby optimizing power utilization across USB Type-C connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If USB PD protocol is used for power management, then power delivery capability is improved, but device compatibility is worsened for devices that do not support USB PD
Solution Approach 1:
The patent introduces an intermediary mechanism that extracts power requirement information from USB configuration descriptors and uses this information to dynamically adjust power allotment. This intermediary layer enables the host to provide optimized power to non-USB PD devices without requiring them to support the USB PD protocol, thus resolving the contradiction between power delivery capability and device compatibility
2Adaptability or versatility
If predetermined power is reserved for non-USB PD devices, then device compatibility is maintained, but power utilization efficiency is worsened
Solution Approach 1:
The patent implements dynamic power allotment by continuously monitoring power requirement information extracted from USB configuration descriptors and adjusting the power provided to each device in real-time. This dynamic approach replaces static predetermined power reservation with adaptive power management, maintaining device compatibility while significantly improving power utilization efficiency by allocating exactly the amount of power each device needs
3Speed
If higher power levels are provided to all devices, then charging speed is improved, but power consumption is worsened for low-power devices
Solution Approach 1:
The patent applies local quality by providing different power levels to different devices based on their specific power requirements extracted from USB configuration descriptors. High-power devices receive higher power levels for fast charging, while low-power devices receive appropriate lower power levels, ensuring each device gets the optimal power quantity locally rather than a uniform power level globally
Data Source
AI summary
A method and system for managing power for Universal Serial Bus (USB) ports, in particular USB Type-C ports that are connected to USB devices that do not support USB power delivery (USB PD). The method and system present an advertisement of a default power supply to a USB device, receive power attribute information from a USB device configuration descriptor during USB device enumeration, in response to the connecting USB device not supporting USB power deliver (USB PD), and dynamically change the power supply to meet the power requirements of the connecting USB device identified by the power attribute information.