USB-C Power Negotiation Circuit for Dynamic Voltage Adaptation
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Solution Overview
Problem
USB-C cables equipped with USB-PD technology face challenges in adapting voltage and current to meet the dynamic power needs of connected devices, as existing methods may provide power sets that the source is not capable of supplying, especially due to environmental factors like temperature.
Innovation Solution
A method and circuitry within the connection interface that periodically measures and selects the appropriate power supply values from a standardized list, including current, voltage, and minimum voltage, to match the device's requirements, using a control unit with logic and measurement circuits to negotiate and adapt the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed power supply method is used based on standardized values, then the device complexity is reduced and ease of manufacture is improved, but the adaptability to dynamic power needs and environmental conditions deteriorates
Solution Approach 1:
The patent implements a dynamic power supply method where the system periodically measures actual power delivery capability and selects from multiple standardized power sets. This allows the power supply to adapt its parameters (voltage, current) in real-time based on measured conditions while still using standardized value sets, resolving the contradiction between manufacturing simplicity and operational adaptability
Solution Approach 2:
The system changes power supply parameters by selecting from multiple standardized power sets with different voltage and current values. Based on periodic measurements of power delivery capability and device requirements, the system dynamically adjusts which standardized power set is active, maintaining ease of manufacture through standardization while achieving adaptability through parameter selection
2Device complexity
If power supply values are selected without real-time measurement, then the device complexity is reduced, but the reliability of power delivery deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the system periodically measures actual power delivery capability and uses this information to select appropriate power supply values. This feedback loop ensures reliable power delivery by base(ing selections on actual conditions while keeping device complexity manageable through automated measurement and standardized power sets
Solution Approach 2:
The system performs self-measurement of its power delivery capability and automatically selects appropriate power supply parameters without external intervention. This self-service approach ensures reliability through real-time awareness of system capabilities while minimizing added complexity by automating the measurement and selection process
3Reliability
If periodic measurement and selection of power values is implemented, then the adaptability and reliability of power delivery are improved, but the device complexity increases
Solution Approach 1:
The patent uses a universal approach where a single control mechanism handles multiple functions: periodic measurement of power delivery capability, interpretation of device power requirements, and selection from standardized power sets. This multi-functionality improves reliability through comprehensive monitoring while limiting complexity growth by consolidating control logic
Solution Approach 2:
The system performs preliminary measurements of power delivery capability and device requirements before selecting power supply parameters. This advance preparation ensures reliable power delivery by ensuring compatibility before power transfer begins, while managing complexity through automated preliminary assessment routines
Data Source
AI summary
A method selects one or a plurality of sets of values characterizing an electric power of a power source capable of powering a device coupled to the power source via a connection interface. The selection is carried out according to values, characterizing the power supplied by the power source, measured at the connection interface.