USB Power Source Contract Control Under Supply Rating Limits
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Solution Overview
Problem
Existing power delivery systems fail to optimize power distribution between power source and sink devices, often exceeding the power supply rating and leading to inefficient use of available power.
Innovation Solution
A power source device equipped with a power measurement controller and contract manager dynamically adjusts power delivery contracts based on total system consumption, power supply rating, and previous contracts to balance power levels, preventing overburdening the supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power delivery contracts are negotiated based on deliverable power and usable power, then power distribution is optimized, but the system complexity increases due to dynamic adjustment mechanisms
Solution Approach 1:
The patent implements dynamic power delivery contracts that are continuously adjusted based on real-time power consumption measurements. The power source device dynamically modifies power delivery parameters to match actual demand, transforming the static power delivery system into a dynamic one that adapts to changing conditions.
Solution Approach 2:
The system incorporates feedback mechanisms where power consumption is measured and used to adjust power delivery contracts. The power source device receives feedback on actual power usage and modifies its delivery accordingly, creating a closed-loop control system that optimizes power distribution based on real-time conditions.
2Reliability
If total power consumption exceeds power supply rating, then power delivery is reduced to prevent overburdening, but the usable power for the power sink device decreases
Solution Approach 1:
The system applies partial action by delivering only the necessary power required by the power sink device rather than full power. When total consumption approaches the power supply rating, the system deliberately limits power delivery to prevent overburdening, accepting that not all available power can be delivered under high-demand conditions.
Solution Approach 2:
The patent changes power delivery parameters dynamically based on system conditions. When power consumption approaches the supply rating, the system modifies power delivery parameters (voltage, current, or both) to reduce total power delivery, thereby preventing overburdening while optimizing the distribution of available power among multiple devices.
Data Source
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AI summary
An example power source device includes a universal serial bus interface to couple to a power sink device, a power supply interface to couple to a power supply, a power measurement controller to measure a total power consumption of the power sink device and the power source device, a power contract manager to select a power delivery contract for the power sink device based on the total power consumption, a power supply rating of the power supply and a previous power delivery contract, and a power delivery controller to deliver power to the power sink device according to the selected power delivery contract.