PCB Edge Connector Ground Contact for Static Discharge Prevention
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Solution Overview
Problem
Existing printed circuit board connectors face challenges in establishing a simple and reliable ground connection while ensuring safe handling during replacement, as they are often expensive to design and manufacture, and require precise mechanical guidance and secure grounding to prevent uncontrolled static discharges.
Innovation Solution
A printed circuit board connector with a specially shaped ground connection contact, integrated into the connector housing, uses conductive materials like solid metal for secure contact with the printed circuit board, featuring variants such as soldering or press-in pins, and a conductive stamped and bent part for resilient contact, ensuring optimal grounding and increased durability through enhanced friction and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible ground contact or spiral spring pressure element is used, then a reliable ground connection is established, but the device complexity and manufacturing cost increase
Solution Approach 1:
The ground connection function is extracted as a separate contact element (contact 10) integrated into the connector housing, rather than using complex flexible ground contacts or spiral springs. This separate ground contact element can be a simple conductive stamp or bent part, significantly reducing structural complexity while maintaining reliable ground connection.
Solution Approach 2:
The ground connection contact is implemented as a simple conductive stamp or bent metal part that can be easily manufactured and replaced if needed. This simple design approach reduces manufacturing costs and device complexity compared to expensive flexible ground contacts or spiral spring mechanisms.
2Ease of operation
If the printed circuit board is directly plugged into the slot, then the plugging process is simple, but uncontrolled static discharges may occur
Solution Approach 1:
The ground connection contact (contact 10) is positioned at the leading edge of the connector slot, so it makes contact with the printed circuit board first during insertion. This preliminary ground connection establishes equipotential bonding before any power or signal contacts are made, preventing static discharge while maintaining simple direct plugging operation.
Solution Approach 2:
The ground connection contact establishes equipotential bonding between the connector housing and the printed circuit board before voltage supply. By making the ground contact first, all subsequent contacts occur at the same potential, eliminating static discharge risks during the plugging process.
3Reliability
If resilient contacting is used for the ground connection, then contact reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The ground connection contact is designed with localized resilient features (such as a bent metal part or spring contact) only at the specific contact point, rather than requiring the entire connector to have high precision. This allows resilient contacting for reliability while keeping manufacturing precision requirements manageable through localized design.
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
The solution provides a reliable and cost-effective ground connection, ensuring safe handling during replacements by preventing static discharges and increasing the connector's durability through improved friction and wear resistance in the corner areas.
Implementation Method 1
A printed circuit board connector (1) with a specially shaped ground connection contact (10)... contact reliability is improved... resilient contacting
Implementation Method 2
the relatively sharp edges of the printed circuit board edges, in conjunction with the rough surface of the printed circuit board edges depending on the manufacturing quality, when directly plugged into the slot, increase friction on the generally usual Exercise plastic wall in the two corner areas
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
For a printed circuit board connector (1), in particular an edge-mount connector designed for direct contact with a printed circuit board (30), it is proposed that, to prevent electrostatic discharges during the insertion process, a ground connection is first established between the printed circuit board and the connector before the printed circuit board is fully inserted and connected to the power supply. For this purpose, a ground contact (10) is arranged in one of the corner regions (4) within the insertion slot (3) of the printed circuit board connector, wherein the ground contact (10) is connected to a ground trace on the printed circuit board (40) on which the printed circuit board connector (1) is mounted.During the insertion process, the circuit board (30), on which at least one of the side edges (32) within the insertion area (31) has a ground track (33) applied, is guided sliding past the ground contact (10), so that an electrostatic equalization takes place between the circuit board to be inserted and the connector before the other electrical contacts are made contact.