Charging Interface Soft Short Detection Using Voltage Reference Drift
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Solution Overview
Problem
Electronic devices face issues with soft short circuits at the charging interface, which can cause uncontrolled high currents leading to unsafe heating, due to factors like water ingress or capacitor degradation, without effective detection methods.
Innovation Solution
A method and device implementation using a power management circuit with a voltage reference and processor to measure and compare initial and additional voltage readings, detecting a soft short circuit by a threshold difference, and triggering control actions such as powering down or displaying notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a charging interface is used to facilitate coupling the rechargeable battery to an external power supply, then the electronic device can draw charging current to charge the battery, but soft short circuits can occur due to water ingress or capacitor degradation, causing uncontrolled high currents and unsafe heating
Solution Approach 1:
The system performs preliminary voltage measurements of the voltage reference before charging operations to detect soft short circuits. By measuring the voltage reference when the switching device is in the first state (coupling the voltage reference to the charging interface), the system can identify potential soft short conditions before they cause harmful effects, enabling preventive action rather than reactive response.
Solution Approach 2:
The system continuously monitors the voltage reference and compares additional voltage measurements against initial measurements to detect changes indicating soft short circuits. This feedback mechanism allows the system to detect soft short conditions and respond by controlling the switching device to prevent unsafe heating and protect the charging interface.
2Reliability
If voltage measurements are taken to detect soft short circuits, then the system can identify potential safety issues, but the detection process requires additional measurements and comparisons that increase system complexity
Solution Approach 1:
The voltage reference serves multiple functions: it provides a reference voltage for normal charging operations and simultaneously serves as an indicator for detecting soft short circuits. By utilizing the existing voltage reference component for dual purposes, the system achieves reliable soft short detection without adding separate measurement components, thereby reducing overall system complexity while maintaining detection accuracy.
Data Source
AI summary
A computer-implemented method for detecting soft short circuits at a charging interface of an electronic device is provided. The method includes obtaining an initial voltage measurement of a voltage reference that is electrically coupled to the charging interface of the electronic device. The method includes obtaining a plurality of additional voltage measurements of the voltage reference. The method includes detecting a soft short circuit at the charging interface based, at least in part, on the initial voltage measurement and a voltage measurement of the plurality of additional voltage measurements that is most recent in time. The method further includes causing the electronic device to perform one or more control actions in response to detecting the soft short circuit at the charging interface.