USB-C Connector Ground Switching for Corrosion-Free Charging
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Solution Overview
Problem
USB Type-C sockets experience signal interference and corrosion due to grounding, leading to poor charging performance and user experience, especially in humid environments where foreign matter accumulates on pin terminals.
Innovation Solution
A connector design featuring a first switch unit connected in series between power input and output terminals and a second switch unit connected to a control terminal and ground pin, with a preset reference voltage applied to the ground pin, allowing the connector to de-energize when not connected to a device and preventing corrosion by controlling the on-off state based on temperature and connection status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the USB Type-C socket is grounded to reduce charging interference and enable shield layer to form a loop, then signal interference is reduced and return current is shared, but power pins are corroded in humid environments and foreign matters adhere to pin terminals
Solution Approach 1:
The patent implements dynamic control of the grounding state through a control unit that detects whether a device is connected and adjusts the grounding switch accordingly. When no device is connected, the grounding switch is turned off to prevent corrosion; when a device is connected, the grounding switch is turned on to provide shielding and current sharing. This dynamic adjustment resolves the contradiction between maintaining signal quality and preventing terminal corrosion.
Solution Approach 2:
The patent changes the electrical state parameter of the socket by controlling the grounding switch to transition between grounded and non-grounded states. This parameter change allows the system to optimize performance for different operational conditions, preventing corrosion during idle periods while maintaining signal integrity during active use.
2Speed
If the connector remains energized to maintain charging readiness, then charging response speed is improved, but terminal corrosion increases and port burn-out risk increases
Solution Approach 1:
The patent implements preliminary detection of device connection status through the control unit before enabling charging. The grounding switch is activated in advance when a device is detected, and the connector is de-energized when no device is present. This preliminary action ensures rapid charging response when needed while preventing corrosion and burn-out during idle periods.
Solution Approach 2:
The patent employs periodic monitoring of the connection status and periodic switching of the grounding state and power supply state. This periodic action maintains charging readiness when devices are connected while preventing degradation during idle periods, resolving the contradiction between response speed and terminal durability.
3Reliability
If three-dimensional shielding measures are implemented for USB3.0 communication, then signal interference is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the essential shielding function and implements it through a simplified grounding switch mechanism controlled by connection status detection. Instead of complex three-dimensional shielding structures, the invention uses a controlled grounding connection to achieve the necessary electromagnetic interference protection, significantly reducing device complexity and manufacturing difficulty while maintaining signal quality.
Data Source
AI summary
A connector has a first end provided with a first interface and a second end provided with a second interface. The second interface includes a first switch unit and a second switch unit, where the second switch unit is connected to a control terminal of the first switch unit and a ground pin of the second interface, and a preset reference voltage is input into the ground pin of the second interface. In a case that the second interface is disconnected from a to-be-charged device, the first switch unit is in an off state. In a case that the second interface is connected to the to-be-charged device, the ground pin of the second interface is connected to a ground pin of the to-be-charged device, the ground pin of the second interface is grounded, and the first switch unit is in an on state.