Voltage Feedback Switching for USB-C Drop Compensation
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Solution Overview
Problem
The USB-C protocol faces challenges in maintaining a stable voltage supply due to significant voltage drops between the voltage source and sink devices, leading to potential under-voltage detection and disconnection.
Innovation Solution
A voltage source device with a voltage converter, switches, and a control circuit that dynamically adjusts the feedback loop to compensate for voltage drops by switching the regulation point from the source voltage to the sink voltage, ensuring stable voltage delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If voltage is supplied through a cable with non-negligible resistance, then power can be delivered to the sink device, but significant voltage drop occurs between source and sink
Solution Approach 1:
The patent implements a feedback mechanism where the voltage source device monitors the voltage at its output terminal and adjusts its output voltage accordingly. When voltage drop is detected at the output terminal, the control circuit increases the voltage converter output to compensate, ensuring the sink receives the correct voltage level.
Solution Approach 2:
The patent dynamically changes the output voltage parameter of the voltage converter based on detected voltage drop conditions. The control circuit adjusts the voltage level in real-time, switching between different voltage output levels to compensate for cable resistance effects and maintain stable power delivery.
2Reliability
If voltage compensation is implemented by monitoring output terminal voltage, then voltage stability at the sink is improved, but device complexity increases due to additional control circuits and switches
Solution Approach 1:
The control circuit performs multiple functions: it monitors voltage at the output terminal, determines whether voltage drop compensation is needed, and adjusts the voltage converter output accordingly. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent implements preliminary voltage adjustment by the voltage converter based on anticipated voltage drop conditions. The control circuit proactively adjusts the output voltage before significant undervoltage occurs at the sink, preventing connection resets rather than reacting to them.
3Measurement precision
If the feedback line is continuously coupled to the output terminal for voltage monitoring, then accurate voltage compensation is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic voltage monitoring instead of continuous monitoring. The control circuit periodically samples the voltage at the output terminal and only activates the feedback switch when monitoring is required, reducing power consumption while maintaining adequate voltage compensation accuracy.
Data Source
AI summary
The present disclosure relates to a voltage source device comprising: a voltage converter for generating a supply voltage at an output node of the voltage converter based on a feedback signal provided on a feedback line; at least one switch coupled between the output node of the voltage converter and an output terminal of the voltage source device; and at least one further switch configured to selectively couple the feedback line to: the output node of the voltage converter during a first regulation mode; and to the output terminal of the voltage source device during a second regulation mode.