USB Type-C Source Port Temperature Control via Power Delivery Renegotiation
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Solution Overview
Problem
USB Type-C power source ports often exceed safe internal temperature limits, necessitating output disablement to prevent overheating, which is inconvenient for users and reduces available power.
Innovation Solution
A system that uses temperature sensors to compare measured temperatures with predefined limits, adjusting the power delivery by renegotiating Power Data Objects (PDOs) to maintain safe temperatures while maximizing available power, utilizing a port controller and output control to manage power contracts with connected power sinks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power source port delivers high power to meet user needs, then the available power increases, but the internal temperature exceeds safe limits
Solution Approach 1:
The system dynamically adjusts the power delivery capabilities advertised by the source port based on real-time temperature conditions. When temperature exceeds thresholds, the source port renegotiates power contracts with connected devices to reduce power delivery, thereby resolving the contradiction between maintaining high power output and preventing overheating
Solution Approach 2:
The system changes the power delivery parameters (voltage and current capabilities) advertised through Power Data Objects based on temperature measurements. By adjusting these parameters dynamically, the system optimizes power delivery while maintaining safe operating temperatures
2Reliability
If the output is disabled to prevent overheating, then the temperature safety is improved, but the user convenience deteriorates
Solution Approach 1:
Instead of statically disabling the output when temperature thresholds are exceeded, the system dynamically renegotiates power contracts to adjust power delivery levels. This maintains continuous operation and user convenience while ensuring temperature safety through adaptive power management
Solution Approach 2:
The system implements a feedback mechanism where temperature sensors continuously monitor internal temperature, and the source port controller uses this feedback to adjust power delivery capabilities. This closed-loop control ensures safety while maintaining operational continuity, avoiding the need to disable output
3Temperature
If the power delivery is reduced to maintain safe temperatures, then the temperature control is improved, but the available power deteriorates
Solution Approach 1:
The system dynamically adjusts power delivery based on real-time temperature conditions rather than maintaining a fixed reduced power level. When temperatures are within safe ranges, full power is available; when thresholds are exceeded, power is temporarily reduced, optimizing both temperature control and power availability
Solution Approach 2:
The source port controller changes the power delivery parameters advertised through Power Data Objects based on temperature measurements. This allows the system to maintain optimal power availability while ensuring temperature control by adjusting parameters only when necessary
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
Effectively regulates internal temperatures within safe limits, allowing continuous operation without disabling the output and maximizing power delivery by dynamically adjusting power levels based on temperature conditions.
Implementation Method 1
one or more temperature sensors converting a measured temperature to an electrical signal
Implementation Method 2
All USB source ports dissipate heat, and therefore have internal temperatures and surface temperatures that exceed the ambient temperature
Data Source
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AI summary
A system to regulate the temperature of a Source Port (1) that includes a Port Controller (12) having a first source power capabilities list stored thereon in a non-transitory digital media, the source capabilities list identifying a plurality of first power delivery capabilities that, based on their power requirements, may be negotiated by the Port Controller (12), a temperature sensor (16) that measures a temperature of the power system and communicates that measured temperature to a comparator (18). The comparator (18) compares the measured temperature to predefined limit temperatures and when the measured temperature crosses a predefined limit temperature threshold, the first source capabilities list being replaced with a second source capabilities list identifying a plurality of second power capabilities that, based on their power requirements, may be connected to the Source Port (1).