Grounded Power Adapter With Isolated Ground Channel
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Solution Overview
Problem
Conventional power adapters for information handling systems, especially those with small form factors, often lack earth grounding, leading to customer dissatisfaction due to a tingling sensation when touching the device, and larger adapters with 3-wire AC connections are not always feasible for safety and regulatory reasons.
Innovation Solution
A power adapter design featuring a plug member with a power connector and a ground connector positioned on separate channels within the adapter base, allowing for a grounded power connection without increasing the adapter's size, using a two-pin AC cord and ensuring the ground connector is isolated from the power connector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a 3-wire AC connection with earth ground is added to the adapter, then customer satisfaction improves by eliminating the tingling sensation, but the adapter size increases and safety concerns arise
Solution Approach 1:
The adapter separates the ground connection function from the power connection function by providing distinct ground contacts and power contacts. The ground contacts are positioned on the adapter body while power contacts are on the plug member, dividing the grounding function into independent elements that can be selectively engaged.
Solution Approach 2:
The patent transitions from a conventional 2D plug-socket interface to a 3D spatial arrangement where ground contacts and power contacts occupy different spatial dimensions and planes. This allows simultaneous grounding and power connection without requiring a larger footprint, as the contacts are arranged in multiple layers and orientations within the compact adapter body.
2Object-affected harmful factors
If a 3-wire AC connection with earth ground is added to the adapter, then customer satisfaction improves by eliminating the tingling sensation, but regulatory approval becomes more difficult to obtain
Solution Approach 1:
The adapter employs a dynamic engagement sequence where the ground contacts are designed to engage with the socket before the power contacts make full contact. This temporal sequencing ensures that grounding is established prior to power delivery, dynamically managing the safety state during the plugging operation to meet regulatory requirements.
Solution Approach 2:
The adapter body serves as an intermediary element that provides the ground connection path independently of the power cord. By positioning ground contacts on the adapter body itself rather than requiring them on the power cord, the design creates an intermediate grounding path that simplifies regulatory compliance while eliminating the tingling sensation.
3Reliability
If the ground connector is isolated from the power connector on separate channels, then safety is improved and regulatory compliance is achieved, but device complexity increases
Solution Approach 1:
The patent merges the ground connection and power connection functions into a single integrated adapter body and plug member assembly. While the contacts are spatially separated on different channels, they are structurally combined in one unit, reducing overall device complexity compared to separate ground and power adapters.
Solution Approach 2:
The adapter body serves multiple functions simultaneously: it houses the ground contacts, provides structural support, enables dynamic engagement sequencing, and facilitates both grounding and power connection through its integrated design. This multi-functionality reduces the need for additional separate components, offsetting the complexity introduced by the separated contact channels.
Data Source
AI summary
A power adapter includes an adapter base defining a plug member channel immediately adjacent a first channel wall and a second channel wall that is oriented substantially perpendicular to the first channel wall. A power member connector extends into the first channel wall such that no part of the power member connector protrudes into the defined plug member channel. A ground member connector is located on the second channel wall and spaced apart from the power member channel. A plug member includes a plug base having a first plug wall and a second plug wall that is oriented substantially perpendicularly to the first plug wall. A power member is located on the first plug wall and a ground member is located on the second plug wall. The plug member is operable to be inserted into the plug member channel such that the power member enters the power member channel and electrically couples to the power member connector and the ground member engages the ground member connector.