USB Controller Connection Detection via Voltage Level Monitoring
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Solution Overview
Problem
Conventional methods for detecting USB device connection to a host unit are inconvenient and inefficient, especially when using USB extension wires, leading to potential power supply malfunctions due to non-standard hardware components and high power consumption.
Innovation Solution
A detecting system comprising a power unit, USB interface, switch module, and USB controller that selectively outputs power signals to determine the connection status by monitoring power and data contact levels, allowing precise detection of USB device connection while optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact pin is used to detect USB device connection, then the connection status can be detected, but the hardware component becomes non-standard and utilization becomes inconvenient
Solution Approach 1:
The patent applies universality by using standard USB interface contacts (power contact and data contacts) for multiple purposes: both for their original functions (power supply and data transmission) and for connection detection. The USB controller detects connection status by monitoring voltage levels on these standard contacts, eliminating the need for non-standard hardware components while maintaining detection accuracy
Solution Approach 2:
The system uses the USB interface's own power and data contacts to perform self-detection of connection status. The USB controller monitors the voltage levels on these contacts, which change based on whether a device is connected, allowing the system to detect connection status using its existing components without requiring additional detection hardware
2Adaptability or versatility
If power is supplied through USB extension wire, then the USB device can be connected remotely, but the host unit malfunctions with high power consumption
Solution Approach 1:
The system performs preliminary connection detection by monitoring voltage levels on power and data contacts before supplying full power. The USB controller detects the presence of a USB device through voltage level changes, then decides whether to activate power supply, preventing unnecessary power consumption when no device is connected or when connection is invalid
Solution Approach 2:
The system uses feedback from voltage level monitoring on power and data contacts to control power supply activation. The USB controller continuously monitors the voltage levels and uses this feedback to determine when to activate or deactivate power supply, optimizing power consumption based on actual connection status
3Measurement precision
If voltage level detection is implemented on power and data contacts, then accurate connection detection is achieved, but the system complexity increases
Solution Approach 1:
The patent uses standard USB interface contacts (power contact and data contacts) for multiple purposes: both for their original functions (power supply and data transmission) and for connection detection. The USB controller detects connection status by monitoring voltage levels on these standard contacts, eliminating the need for additional detection hardware while maintaining detection accuracy
Solution Approach 2:
The system uses the USB interface's own power and data contacts to perform self-detection of connection status. The USB controller monitors the voltage levels on these contacts, which change based on whether a device is connected, allowing the system to detect connection status using its existing components without requiring additional detection hardware
Data Source
AI summary
A system for detecting universal serial bus (USB) device and method thereof are described. The system and method utilizes a USB controller to control a switch module and to detect the signal level of USB interface for determining whether the USB device is electrically connected to the host unit. Therefore, the system and method are capable of improving the power consumption of the host unit.