USB 3.0 Receptacle Baffle Plate Grounding Path
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Solution Overview
Problem
Existing USB 3.0 electrical receptacle connectors suffer from noise interference due to the inefficient grounding of noise currents, which leads to radiofrequency interference (RFI) and electromagnetic interference (EMI), affecting the operation of connected devices like wireless mice.
Innovation Solution
The electrical receptacle connector design incorporates a metallic shell, a baffle plate, and conductive ground legs that are in contact with the circuit board, allowing noise currents to be directly grounded through a shorter path, reducing the antenna effect and minimizing noise spreading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding iron sheet is assembled at the rear portion of the metallic shell to shield noise, then the noise shielding effect is improved, but the grounding distance increases and noise current spreads through a longer path
Solution Approach 1:
The patent introduces a conductive baffle plate as an intermediary component positioned between the shielding iron sheet and the ground legs. This baffle plate serves as a mediator to redirect and shorten the grounding path of noise current, allowing the current to reach the ground legs more directly without traveling through the entire length of the metallic shell rear portion.
Solution Approach 2:
The patent extracts the grounding function from the distant ground legs and brings it closer to the noise source by positioning conductive ground legs adjacent to the rear portion of the metallic shell, where they can directly contact the baffle plate and provide a shortened grounding path for noise current.
2Device complexity
If ground legs are positioned distant from the shielding iron sheet, then the metallic shell structure is simplified, but the noise current grounding efficiency decreases
Solution Approach 1:
The conductive baffle plate acts as an intermediary that bridges the gap between the simplified metallic shell structure and the need for efficient noise current grounding. It provides a direct conduction path from the shielding iron sheet to the nearby ground legs without requiring complex structural modifications to the metallic shell.
3Adaptability or versatility
If noise current travels a longer distance to reach ground legs, then the connector structure is less constrained, but the antenna effect increases and noise spreads
Solution Approach 1:
The patent extracts the noise current from its original long-path trajectory and redirects it through a shortened path by positioning ground legs near the rear portion of the metallic shell and using a conductive baffle plate to guide the current directly to these nearby ground legs, reducing the antenna effect.
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 design effectively shields and grounds noise currents, reducing electromagnetic and radiofrequency interference, thereby improving the performance of connected devices by minimizing lag and ensuring reliable signal transmission.
Implementation Method 1
the noise is shielded by the baffle plate
Implementation Method 2
the conductive ground legs are in contact with the sidewalls... the current flowing through the baffle plate is guided to the circuit board through the conductive ground legs
Data Source
AI summary
An electrical receptacle connector includes a metallic shell, a terminal module in the metallic shell, a baffle plate at a rear portion of the metallic shell, and conductive ground legs. Accordingly, the baffle plate is at the rear portion of the metallic shell, and the conductive ground legs are at two sides of the metallic shell. Therefore, during the connector transmits data, the produced noises are shielded by the baffle plate, and the current formed by the noises is guided to a circuit board through the conductive ground legs, thus the noises are grounded and diminished. The conductive ground legs are adjacent to the baffle plate. Hence, the current flowing through the baffle plate is guided to the circuit board through the conductive ground legs, with a shorter path. Therefore, the current would not have antenna effect easily on the path, and the noise spreading can be reduced.