USB Interface System Power-Aware Speed Adjustment
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Solution Overview
Problem
Existing USB host platforms often limit the power supply to connected USB devices, causing them to be powered off when attempting to operate at high connection speeds, leading to a dead loop where the device cannot be used effectively.
Innovation Solution
A USB interface system with a slave power detection module that performs handshakes in multiple connection specifications, detects power-off events, and adjusts connection speed and power consumption by recording and utilizing power-off information to switch to lower speeds upon reconnection, ensuring compatibility with the USB host's power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the USB device operates at the highest connection speed, then the data transfer speed is improved, but the power consumption increases beyond the USB host's power capability
Solution Approach 1:
The USB device dynamically adjusts its connection speed based on power availability. The system transitions from a static high-speed mode to a dynamic mode where connection speed is adjusted in real-time according to power consumption capabilities, allowing the device to operate at highest speed when power is available and reduce speed when power is limited
Solution Approach 2:
The connection speed parameter is changed based on power consumption conditions. The system monitors power availability and adjusts the connection speed parameter accordingly, switching between different speed modes (e.g., Super speed plus, Super speed, High Speed) to match the power capabilities of the USB host platform
2Productivity
If the USB device starts with the highest connection speed, then the data transfer performance is improved, but the device is powered off when power consumption exceeds host capability
Solution Approach 1:
The system performs preliminary power capability detection before establishing high-speed data transfer. By detecting the USB host's power capability in advance and configuring appropriate power management settings beforehand, the device avoids the dead loop of being powered off during operation, ensuring both high performance and stable connection
3Speed
If the USB device operates at high connection speed, then the data transfer rate is improved, but the device cannot be used effectively when powered off due to power limits
Solution Approach 1:
The system implements feedback mechanisms to monitor power consumption and connection status. When the device detects that it is being powered off due to exceeding power limits, it receives feedback about the power capability and automatically adjusts its operation to a lower connection speed, ensuring continuous usability without manual intervention
Data Source
AI summary
A USB interface system capable of automatically adjusting connection speed and power consumption capability and a method thereof are provided. The method includes configuring a slave device to perform a first handshake procedure with a main device, and communicate with the main device by using a first connection specification; detecting a first power-off event by using a slave power detection module; when the first power-off event occurs, recording first power-off information by the memory unit. If the slave device is re-connected to the main device, the slave power detection module is configured to perform a second handshake process with the main device, and determine to re-communicate with the main device in a second connection specification different from the first connection specification according to the first power-off information.