Dynamic USB Hub Power Management via Port Speed Adjustment
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Solution Overview
Problem
Conventional USB hubs lack flexibility in current distribution, leading to inconvenience when multiple devices with varying power requirements are connected, as the current cannot be adjusted, limiting the number of ports and user flexibility due to cost constraints of external transformers.
Innovation Solution
A dynamic power management system for USB hubs that includes a host device, power unit, and a hub device with a power management module and hub function module, which dynamically adjusts port status by calculating available current and managing execution modes based on device connections, allowing for dynamic adjustment of current distribution and reducing the need for costly external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external transformer is used to increase supplying current, then the supplying current of the hub is improved, but the cost and device complexity increase
Solution Approach 1:
The patent implements dynamic power management by allowing the USB hub to adjust the execution modes and current allocation to each port in real-time based on the connected devices' power requirements. The power management module continuously monitors power consumption and dynamically reconfigures power distribution, eliminating the need for fixed high-power transformers while ensuring adequate power supply when needed.
Solution Approach 2:
The system changes the operating parameters of each USB port by adjusting execution modes (e.g., switching between different speed modes like High-Speed and Full-Speed) which have different current requirements. This allows the hub to optimize power consumption by selecting appropriate execution modes based on actual device needs, thereby reducing overall power requirements without external transformers.
2Adaptability or versatility
If more ports are added to the hub, then the port amount is improved, but the transformer must provide more current increasing cost
Solution Approach 1:
The patent applies local quality by assigning different execution modes and power allocation policies to different USB ports based on their specific usage scenarios and connected devices. Each port can be independently configured with appropriate power levels and execution modes, allowing the hub to support multiple ports with varying power requirements without requiring the transformer to provide maximum current to all ports simultaneously.
Solution Approach 2:
The dynamic power management module enables the hub to adapt to different port configurations and device connections in real-time. When devices are connected or disconnected, the system dynamically recalculates and redistributes power across available ports, allowing flexible port expansion without proportionally increasing transformer capacity requirements.
3Reliability
If execution mode is fixed for each port, then the device operation is stable, but the user flexibility and port adaptability are reduced
Solution Approach 1:
The system transitions from fixed execution modes to dynamic mode selection. The power management module continuously monitors device requirements and automatically adjusts execution modes for each port based on actual needs, maintaining stable device operation while providing adaptability to different device types and power requirements.
Solution Approach 2:
The patent implements feedback mechanisms where the hub monitors the operational status and power consumption of connected devices, then uses this information to dynamically adjust execution modes. This closed-loop control ensures devices operate stably in appropriate modes while the system adapts to changing user needs and device configurations.
Data Source
AI summary
A dynamic power management system for USB hub and method thereof are described. The dynamic power management system includes a host device, a power unit and a hub device. A power management module disposed in the hub device dynamically adjusts the power-supplying statuses of ports in the hub device and further reduces the cost of power transformer externally connected to the hub device.