Electronic Device Power Control via Cable Resistance Detection
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Solution Overview
Problem
Electronic devices connected via USB Type-C cables may receive incorrect power current information, leading to unstable power reception due to malfunctions in interface cables, where the device may attempt to draw more current than the cable can supply, causing instability in power reception.
Innovation Solution
The electronic device employs an interface unit with first and second terminals to detect the power supply capability of the external device and determine the type of cable, setting a limited current value based on this information to ensure stable power reception by preventing excessive current draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current detection is performed based solely on CC terminal information presented by the external device, then the electronic device can receive power with higher current, but the power reception becomes unstable when the cable is malfunctioning or not an EMC
Solution Approach 1:
The patent introduces a cable detection function as an intermediary verification mechanism. The detection unit measures the resistance of the cable between the electronic device and external device to verify whether the cable is an EMC. This intermediary check validates the CC terminal information before the electronic device commits to high-current power reception, preventing unstable power reception caused by cable malfunctions or mismatches.
2Productivity
If the electronic device determines current capability based on CC terminal information, then power reception speed increases, but measurement precision of actual cable capability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the detection unit continuously monitors the cable resistance and compares it against predetermined thresholds. The detection result feeds back to the control unit, which adjusts the power reception current accordingly. This closed-loop feedback ensures that the electronic device receives power at the highest safe current level while maintaining accurate detection of actual cable capabilities, preventing both underutilization and overcurrent conditions.
Data Source
AI summary
An electronic device receives external power from an external device when connected to the external device via a cable. The electronic device detects the power supply capability of the external device, determines whether the cable is a predetermined type of cable, and sets a current value limit for the external power based on the detected power supply capability of the external device and on the result of determining whether the cable is the predetermined type of cable.