USB-C Adapter Plug Contact Sensing to Prevent Arcing Damage
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Solution Overview
Problem
USB Type-C connectors and receptacles experience damage and safety hazards due to arcing caused by voltage differences when the connector is removed during power delivery, resulting from the tight spacing between contacts.
Innovation Solution
Incorporating a piezoelectric membrane in the adapter plug that generates an electrical signal upon user contact, allowing the computing system to detect the disconnect condition and disconnect the bulk capacitor from the receptacle, preventing the voltage difference that leads to arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connector is removed during power delivery operation, then the user can disconnect the devices, but arcing occurs due to voltage difference between contacts causing damage to connector and receptacle
Solution Approach 1:
The system performs preliminary detection of disconnect conditions (such as configuration channel line state changes) before the actual connector removal occurs. Based on this detection, the bulk capacitor is disconnected in advance from the receptacle, preventing the voltage difference that causes arcing while still allowing the user to remove the connector.
Solution Approach 2:
The bulk capacitor acts as an intermediary energy storage element between the power delivery system and the receptacle. By controlling the connection and disconnection of this intermediary component based on detected disconnect conditions, the system prevents direct voltage difference between connector and receptacle contacts, thereby eliminating arcing while maintaining power delivery functionality.
2Manufacturing precision
If tight spacing between contacts is used in USB Type-C connectors and receptacles, then the connector design meets specification requirements, but the electrical field becomes large enough to breakdown air and cause continuous arcing
Solution Approach 1:
The harmful electrical field is eliminated by extracting the bulk capacitor from the connected state before disconnect occurs. By removing the energy storage component that sustains the voltage potential, the electrical field that would cause air breakdown and arcing is eliminated, while the physical contact spacing remains unchanged to meet USB Type-C specifications.
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
This solution effectively eliminates arcing, reduces damage to the connector and receptacle, and enhances safety by maintaining a stable voltage level during disconnection.
Implementation Method 1
Incorporating a piezoelectric membrane in the adapter plug that generates an electrical signal upon user contact
Data Source
AI summary
Systems, apparatuses and methods may provide for power adapter technology that includes an adapter plug having a housing, a plurality of contacts positioned within the housing, wherein the plurality of contacts includes one or more configuration channel contacts, and a piezoelectric membrane positioned on an external surface of the housing, wherein the piezoelectric membrane is electrically connected to the one or more configuration channel contacts. Additionally, sink device technology may detect a signal from the piezoelectric membrane of the adapter plug via the configuration channel contact(s), wherein the signal indicates user contact with the adapter plug, and disconnect a bulk capacitor from a receptacle adjacent to the adapter plug in response to a disconnect condition associated with the user contact.