USB Interface Sharing Circuit for Terminal Miniaturization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing terminal devices face challenges in miniaturization due to the need for separate USB host and slave device interfaces, which are bulky and inconvenient to utilize, as they require internal board space and disassembly for functionality.
Innovation Solution
A circuit and method for USB interface sharing, incorporating a host device module, a slave device module, and a switch module that detects peripheral device types to switch between host and slave functions via a single standard USB interface, utilizing a USB signal switch and current limitation switch to manage power and voltage for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate USB host and slave device interfaces are arranged on the terminal, then both host device function and slave device function can be realized simultaneously, but the terminal size increases and miniaturization is hindered
Solution Approach 1:
The patent implements a single USB interface that can function as both host device interface and slave device interface. The interface is designed with dual functionality, allowing it to adapt to different connection scenarios. When connected to a slave device, the interface operates as a host; when connected to a host device, it operates as a slave, thereby eliminating the need for separate interfaces and reducing terminal size.
Solution Approach 2:
The patent employs dynamic switching mechanisms including detection modules that identify the connected device type and control switches that dynamically reconfigure the interface mode. The system can switch between host and slave device modes based on the detected connection, enabling the same physical interface to serve multiple functions adaptively.
2Adaptability or versatility
If a USB connector is reserved inside the board for slave device function, then slave device function can be realized, but the connector is difficult to access and requires disassembly for utilization
Solution Approach 1:
The patent merges the slave device interface with the existing external USB host interface, making them physically coincident rather than separate. This integration allows the slave device function to be accessed through the same external connector used for host devices, eliminating the need for internal connectors that require disassembly and improving user accessibility.
3Power
If voltage is not limited when peripheral device supplies power to USB interface, then power transmission efficiency is high, but the USB interface may be damaged from excessive voltage
Solution Approach 1:
The patent incorporates a voltage detection mechanism that activates before power transmission begins. The detection module identifies whether the peripheral device is providing power and measures the voltage level in advance. Based on this preliminary detection, the control switch is pre-configured to enable or disable the power transmission path, preventing excessive voltage from reaching the USB interface while maintaining efficient power transfer when safe.
Data Source
AI summary
A circuit for USB interface sharing includes a host device module, a slave device module, a switch module and a Universal Serial Bus (USB) interface. A detection end of the host device module is connected to a signal detection end of the USB interface. A first control output end of the host device module is connected to a first control input end of the switch module. A data end of the host device module is connected to a first data end of the switch module. A data end of the slave device module is connected to a second data end of the switch module. A third data end of the switch module is connected to a data end of the USB interface.