Electronic Device Power Supply Capability Detection
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Solution Overview
Problem
Electronic devices with USB connectors face inaccuracies in detecting the actual power supply capability of power supply apparatuses, which can change or be misrepresented, leading to incorrect charging operations.
Innovation Solution
An electronic device with a charging unit and a testing unit that limits power reception from the power supply apparatus and performs load tests to accurately determine the power supply capability by passing current to a load unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device detects power supply capability through the USB connector, then the charging operation can be initiated, but the detected power supply capability may be inaccurate or misrepresented
Solution Approach 1:
The electronic device performs a load test before initiating normal charging to preliminarily verify the actual power supply capability. The control unit activates a load to draw current from the power supply apparatus and measures the voltage drop, thereby determining the true power supply capability before committing to a charging operation based on potentially misleading detected values.
Solution Approach 2:
A load unit is introduced as an intermediary between the power supply apparatus and the battery charging system. This load serves as a test proxy that allows the electronic device to indirectly assess the power supply apparatus's actual capability by observing its performance under load conditions, rather than relying solely on the power supply apparatus's self-reported capabilities.
2Measurement precision
If the power supply capability is verified through load testing, then the accuracy of power supply detection is improved, but the charging time is extended
Solution Approach 1:
The load test is performed for a limited duration or at a partial load level rather than a full prolonged test. The control unit activates the load for a predetermined time period or at a specific current level sufficient to verify power supply capability without subjecting the battery to excessive charging time delays, balancing verification accuracy with charging efficiency.
Data Source
AI summary
An electronic device comprises a connector that receives power supplied from a power supply apparatus, a charging unit that charges a battery using power received from the power supply apparatus, and a testing unit that tests a power supply capability of the power supply apparatus by passing current supplied from the power supply apparatus to a load unit in a state where receiving power from the power supply apparatus is limited by the charging unit.