USB-C Power Receiver Determining Capability Before Transition
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Solution Overview
Problem
Existing electronic devices that operate as power receiving apparatuses may experience unexpected shutdowns due to the power supply from the power supply apparatus falling below their power consumption, particularly when the power supply capability shifts from 15 W (3 A, 5V) or 7.5 W (1.5 A, 5 V) to Default USB, as the determination of power supply capability according to legacy standards can be time-consuming and may not complete before the power supply is suppressed.
Innovation Solution
An electronic device with a connector comprising a first terminal for receiving power and additional terminals for determining the power supply capability, using the CC terminal and other terminals to determine the power supply capability before a predetermined transition occurs, ensuring stable operation by controlling power reception and consumption based on the determined capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply capability determination is performed using legacy standard (D+ and D- terminals), then compatibility with traditional USB devices is maintained, but the determination time is excessive and may cause unexpected shutdowns before completion
Solution Approach 1:
The patent applies preliminary action by performing power supply capability determination using the CC terminal before the predetermined transition occurs. This allows the system to proactively identify the power supply capability (15W, 7.5W, or Default USB) and adjust power consumption accordingly, preventing unexpected shutdowns while reducing determination time compared to waiting for legacy standard completion
2Reliability
If power supply capability determination is performed quickly using CC terminal before transition, then unexpected shutdowns are prevented, but compatibility with legacy USB standards may be compromised
Solution Approach 1:
The patent applies dynamics by making the power determination method adaptive based on timing conditions. The system dynamically selects between CC terminal determination (when time permits and transition hasn't occurred) and legacy standard determination (when compatibility is prioritized), allowing flexibility to balance between operation continuity and USB standard compatibility depending on the specific operational context
3Ease of operation
If power consumption is not controlled according to determined capability, then device operation is simplified, but power supply may fall below consumption levels causing shutdowns
Solution Approach 1:
The patent applies feedback by continuously monitoring the determined power supply capability and adjusting power consumption accordingly. After determining the power supply capability through CC terminal or legacy standard, the system provides feedback to the power control unit which then regulates power consumption to match the available supply, ensuring reliable operation while maintaining automated simplicity
Data Source
AI summary
An electronic device includes a connector that includes a first terminal for receiving power from a power supply apparatus, a second terminal, a third terminal, and a fourth terminal; a control unit that controls power received from the power supply apparatus via the first terminal; and a determination unit that determines a power supply capability of the power supply apparatus by using the second terminal or the third terminal and the fourth terminal, wherein the determination unit determines the power supply capability of the power supply apparatus by using the third terminal and the fourth terminal before a predetermined transition occurs in the second terminal.