USB Type-C Configuration Channel Line Powering Light Emitting Unit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing USB Type-C charge interface devices face challenges in powering the control circuit for a light emitting unit when the plug is not coupled to a charging device, as the VBUS line does not provide a suitable voltage and power supply until the plug is connected.
Innovation Solution
A control circuit and method that utilize a configuration channel line to detect when the plug is connected, enabling or disabling the light emitting unit by switching between modes to provide power to the unit without an additional light power line, using a first and second control unit, switches, and a pull-up element to manage voltage and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the VBUS power line is used to power the control circuit, then the power supply ability is improved when the plug is connected, but the control circuit cannot be powered when the plug is not connected
Solution Approach 1:
The configuration channel line CC is given dual functionality: it serves both as a data/configuration communication line and as a power supply line. By detecting voltage division on this line, the control circuit can determine plug connection status and activate the light emitting unit accordingly, eliminating the need for a separate light power line while ensuring reliable operation in both connected and disconnected states
2Reliability
If an additional light power line VLED is installed, then the light emitting unit can be powered when the plug is not connected, but the device complexity increases
Solution Approach 1:
The configuration channel line CC is given dual functionality: it serves both as a data/configuration communication line and as a power supply line. By detecting voltage division on this line, the control circuit can determine plug connection status and activate the light emitting unit accordingly, eliminating the need for a separate light power line while ensuring reliable operation in both connected and disconnected states
Solution Approach 2:
The patent merges the power supply function for the light emitting unit into the existing configuration channel line CC. The same line that carries configuration signals also carries power during specific operational modes, consolidating multiple functions into a single circuit pathway and reducing overall system complexity
Data Source
AI summary
A control circuit includes a first control unit, a power unit, a driver unit, a second control unit, a power source, a first switch, a pull-up element and a second switch. The first control unit is used to detect whether a configuration channel line has a predetermined divided voltage and generate a control signal accordingly. The power unit is coupled to the configuration channel line and a power line for supplying power to the driver unit. The driver unit is used to enable or disable a light emitting unit according to the control signal. The second control unit is used to detect whether the configuration channel line has the predetermined divided voltage and control the first switch and the second switch accordingly. The first switch is coupled between a power source and the configuration channel line. The second switch is coupled between the pull-up element and the configuration channel line.