Connector Ground Contact Length Sequence for Noise Reduction
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Solution Overview
Problem
When an external connector is connected to an electronic device, harmful components like noise can enter the circuit due to improper grounding, leading to malfunctions.
Innovation Solution
The electronic device features a receptacle with a specific contact order, where the ground connection is established first, followed by connections to the control circuit and other contacts, ensuring that harmful components are minimized by prioritizing the ground connection during inter-connector connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contacts are connected in a conventional order without ground priority, then the connection process is simple, but harmful components like noise can enter the circuit causing malfunctions
Solution Approach 1:
The ground contact is designed to extend further than other contacts, enabling it to make contact first during the connection process. This preliminary grounding action establishes a safe reference potential before other circuit connections are made, preventing noise and harmful components from entering the circuit.
Solution Approach 2:
The connector contacts are segmented into different lengths with the ground contact being the longest. This segmentation allows different contacts to make connection at different times during insertion, with ground contacts making contact first and other contacts following in a controlled sequence.
2Object-affected harmful factors
If ground connection is established first, then harmful components are reduced, but the connector structure becomes more complex
Solution Approach 1:
The ground contact is designed to extend further than other contacts, enabling it to make contact first during the connection process. This preliminary grounding action establishes a safe reference potential before other circuit connections are made, preventing noise and harmful components from entering the circuit.
Solution Approach 2:
Different contacts are given different local qualities in terms of length and positioning. The ground contact specifically has a longer extension to ensure it makes contact first, while other contacts have shorter extensions. This local differentiation in contact geometry enables the ground-first connection sequence without requiring complex control mechanisms.
Data Source
AI summary
An electronic device is provided. The electric device includes a receptacle configured to be connected with an external connector, and a ground member and a control circuit that are electrically connected to the receptacle. The receptacle includes a shell configured to accommodate the external connector, a tongue disposed in a space of the shell and enclosed by the shell, at least one first contact disposed on the tongue and electrically connected to the ground member, at least one second contact disposed on the tongue and electrically connected to the control circuit, and at least one third contact that is formed of at least a portion of a conductive member included in the tongue and electrically connected to the control circuit. The first contact may have a length further extending over the third contact in a direction where the external connector is separated from the receptacle.