USB-C Power Delivery Feedback Control for Burnout Prevention
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Solution Overview
Problem
The impedance in the power and signal transmission line of USB Type-C charging systems causes voltage differences at both terminals, leading to potential burnout during high-power and large-current transmission, which existing protocols fail to adequately address.
Innovation Solution
An adaptive power setting and protection method that includes feedback mechanisms for the power sink to transmit impedance data through the channel configuration signal line, allowing the power source to adjust output current and voltage accordingly to prevent burnout and ensure safe power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power and large current are transmitted through the power and signal transmission line, then charging efficiency is improved, but voltage difference increases causing potential burnout
Solution Approach 1:
The patent implements a feedback mechanism where the power sink measures the feedback voltage from the power source and calculates impedance information. This impedance data is fed back to the power source through the CC line, enabling the power source to adjust its output voltage and current dynamically. This closed-loop feedback system allows high power transmission while maintaining safety by preventing excessive current that could cause burnout.
Solution Approach 2:
The patent dynamically changes the output voltage and current parameters based on the calculated impedance information. The power source adjusts these electrical parameters in real-time according to the feedback from the power sink, optimizing charging efficiency while preventing dangerous current levels that would cause burnout during high-power transmission.
2Reliability
If impedance compensation is implemented to prevent burnout, then safety is improved, but system complexity increases
Solution Approach 1:
The power sink performs self-measurement of the feedback voltage and self-calculation of impedance information. By enabling the power sink to autonomously measure and calculate its own operating conditions, the system achieves protection functionality without requiring additional external monitoring devices or complex control circuits, thus minimizing system complexity while improving safety.
Solution Approach 2:
The existing CC line, originally designed for communication, is utilized to transmit impedance information from the power sink to the power source. This multi-functional use of the CC line for both communication and impedance data transmission eliminates the need for separate dedicated measurement and communication channels, reducing system complexity while achieving comprehensive protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively prevents burnout by limiting current when impedance exceeds safety specifications and compensates voltage when within specifications, ensuring reliable and efficient power delivery.
Implementation Method 1
the power source limits the output current when a ratio of the output current to the feedback voltage exceeds a specification
Implementation Method 2
the impedance at both terminals of a bus power line of a power and signal transmission line
Implementation Method 3
adjusting, by power source, the output voltage according to the feedback voltage when the ratio of the output current to the feedback voltage does not exceed the specification
Data Source
AI summary
The preferred embodiment of the present disclosure relates to an adaptive power setting and protection method in power transmission and a power supply system using the same. The method includes: providing a power and signal transmission line between a power source and a power sink; providing a corresponding output voltage according to a power request transmitted by the power sink from the power and signal transmission line; detecting an output current by the power source; receiving a feedback voltage from the power sink through the power and signal transmission line; limiting the output current when a ratio of the output current to the feedback voltage exceeds a specification; and increasing the output voltage to perform voltage compensation according to the feedback voltage when the ratio of the output current to the feedback voltage does not exceed the specification.