USB-C e-Marker Humidity Detection for Secure Power Delivery
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Solution Overview
Problem
Existing USB technologies cannot detect humidity or moisture in USB-C connectors, which can affect power supply security, especially in high-humidity environments or when the connector is exposed to water.
Innovation Solution
A USB cable and e-marker device that includes an anomaly detection circuit to detect parasitic electrochemical impedance between a target pin and ground, allowing for the determination of humidity levels and enabling prompt cutoff of power delivery if humidity affects power supply security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If USB power delivery is enabled to support high power transmission (5-100 watts), then power delivery capability is improved, but power supply security deteriorates due to inability to detect humidity or moisture in the connector
Solution Approach 1:
The e-marker device performs humidity detection during a test period before power delivery is fully activated. By measuring parasitic electrochemical impedance between the target pin and ground in advance, the system can identify high-humidity conditions and prevent power delivery, thereby avoiding potential damage while enabling high-power capability when conditions are safe
Solution Approach 2:
The e-marker device acts as an intermediary component between the power source and the USB connector. It measures the parasitic electrochemical impedance to indirectly detect humidity levels in the connector, providing a safety mechanism that enables high power delivery only when the connector environment is safe
2Reliability
If e-marker device adds humidity detection functionality, then power supply security is improved, but device complexity increases
Solution Approach 1:
The e-marker device integrates multiple functions: it serves as an identification element for USB PD protocol communication and simultaneously functions as a humidity detection device by measuring parasitic electrochemical impedance. This multi-functionality approach adds safety capability without requiring a completely separate detection system, thereby limiting the increase in device complexity
Solution Approach 2:
The e-marker device uses the existing electrical connection and pins (target pin and ground) to perform self-diagnosis of the connector environment. By measuring the parasitic electrochemical impedance through its own circuitry, the device independently determines humidity levels without requiring external detection equipment, thus adding safety functionality with minimal additional complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively detects humidity levels in USB-C connectors, ensuring power supply security by allowing for immediate power cutoff when humidity poses a risk, thus preventing potential damage or safety issues.
Implementation Method 1
The e-marker device detects a parasitic electrochemical impedance between the target pin and ground during a test period. The e-marker device obtains humidity information of the first USB connector based on the parasitic electrochemical impedance.
Data Source
AI summary
A USB cable, an e-marker device, and a humidity detection method for a USB connector are provided. The USB cable includes a first USB connector, a second USB connector, and an e-marker device. The second USB connector is coupled to the first USB connector. The e-marker device is coupled to a CC pin and a target pin of the first USB connector. The e-marker device detects a parasitic electrochemical impedance between the target pin and ground during a test period. The e-marker device obtains humidity information of the first USB connector based on the parasitic electrochemical impedance.