Feedback Loop Switching for USB-C Voltage 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 the cable between source and sink devices, then power delivery is enabled, but voltage drop occurs leading to potential under-voltage detection
Solution Approach 1:
The system performs preliminary negotiation of voltage levels between source and sink devices before actual power delivery. The source device determines the sink's voltage requirements in advance and configures its voltage regulator accordingly, preventing under-voltage conditions during operation.
Solution Approach 2:
The system implements a feedback mechanism where the sink device communicates its voltage requirements back to the source device through the USB-C interface. The source device uses this feedback information to adjust its output voltage and maintain stable power delivery despite cable resistance.
2Adaptability or versatility
If voltage negotiation is performed between source and sink devices, then appropriate voltage level is established, but connection reset may occur due to under-voltage detection
Solution Approach 1:
The system completes voltage negotiation and establishes the operating voltage level before enabling power delivery. This preliminary configuration ensures that when power is supplied, the voltage is already set to the agreed level, preventing connection resets.
Solution Approach 2:
The source device proactively compensates for potential voltage drops by adjusting its output voltage upward based on the negotiated level and expected cable characteristics. This preliminary anti-action prevents under-voltage conditions that would trigger connection resets.
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.