USB Module Ground Drop Compensation for Reliable Data Transmission
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Solution Overview
Problem
In automotive applications, the remote placement of USB modules from the main electronic system due to installation and thermal constraints leads to ground potential offsets, causing voltage drops that impair data transmission, especially with longer USB cables and higher charging currents, exceeding the 250 mV threshold.
Innovation Solution
A USB module with a semiconductor interface that connects multi-core USB cables, allowing the semiconductor module to reference output signals to the ground potential, compensating for ground drops along the USB cable, thereby enabling reliable data transmission over longer distances and higher charging currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the USB module is placed remotely from the main electronic system due to installation space and thermal limitations, then the installation flexibility is improved, but the ground potential offset increases causing voltage drop that impairs data transmission
Solution Approach 1:
The patent introduces an intermediary device (USB module with ground drop compensation) between the main electronic system and the external device. This intermediary actively measures the ground potential offset and compensates for it by adjusting the voltage level of configuration signals, thereby maintaining reliable data transmission despite the remote placement and associated ground drops.
Solution Approach 2:
The patent dynamically changes the voltage parameter of configuration signals based on the measured ground potential offset. The USB module adjusts the voltage level of signals on configuration lines (such as CC lines in USB Type-C) to compensate for the ground drop, ensuring that the effective voltage remains within acceptable ranges for reliable communication.
2Length of stationary object
If longer USB cables are used to accommodate remote USB module placement, then the installation flexibility is improved, but the ground drop increases exceeding the 250 mV threshold and causing interference
Solution Approach 1:
The USB module acts as an intermediary that actively compensates for ground drop over long cable lengths. It measures the actual ground potential offset and adjusts configuration signal voltages accordingly, enabling reliable operation even when the USB cable length causes ground drops that would normally exceed the 250 mV threshold.
Solution Approach 2:
The patent implements a feedback mechanism where the USB module continuously monitors the ground potential offset through configuration lines and uses this information to adjust the voltage level of outgoing configuration signals. This closed-loop control ensures that the compensation adapts to changing conditions, maintaining reliable data transmission over long cables.
3Power
If higher charging currents are transmitted to meet increasing power demands, then the power delivery capability is improved, but the ground drop increases causing voltage offset that impairs communication
Solution Approach 1:
The patent dynamically changes the voltage parameter of configuration signals in response to varying charging currents. When higher charging currents are transmitted, the ground potential offset increases, and the USB module compensates by adjusting the voltage level of configuration signals to maintain reliable communication despite the increased power demand.
Solution Approach 2:
The USB module serves as an intermediary that decouples the relationship between charging current and communication quality. It actively measures the ground drop caused by high charging currents and compensates for it, allowing the system to deliver high power while maintaining reliable data transmission through configuration lines.
Data Source
AI summary
A USB module includes a first USB port configured to connect a first USB-compatible device with a first USB cable and a USB plug, and a second port configured to connect a second USB-compatible device with a second USB cable. The USB cables are multi-core and respectively comprise first and second configuration lines. An interface is arranged between the first USB port and the second port in a housing interior of a housing of the USB module. The interface makes at least the first configuration line connectable to the second configuration line. The interface comprises a semiconductor module configured to reference to a ground potential of the USB module at least one output signal at the USB module on a configuration connection between the first and second configuration lines.