Power Adapter Assembly Using Guide Rails and Ultrasonic Welding
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Solution Overview
Problem
Traditional power adapter assembly methods rely on adhesives, wires, and fasteners, which increase costs and labor, and fix parts together without allowing for adjustments, leading to potential assembly errors and stress on connections.
Innovation Solution
The power adapter design incorporates an enclosure with guide rails and electrical springs, along with a cap that interlocks with a circuit board using ultrasonic welding, eliminating the need for adhesives and wires by creating a mechanical constraint through an interference fit and blind mate electrical connections, allowing for self-alignment and reduced assembly variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesives, wires, and fasteners are used to assemble adapter parts, then parts can be fixed together, but assembly cost and labor increase
Solution Approach 1:
The patent combines multiple separate components (enclosure, circuit board, cap) into an integrated assembly where the circuit board is directly mounted within the enclosure and the cap is ultrasonically welded to both the enclosure and circuit board, eliminating the need for separate adhesives, wires, and fasteners while reducing assembly steps and cost
Solution Approach 2:
The patent replaces traditional mechanical fastening systems (screws, clips, adhesives) with ultrasonic welding technology that uses high-frequency vibration to melt and bond thermoplastic materials directly, creating strong permanent joints without additional fasteners or adhesives
2Stability of the object's composition
If adhesives are used to fix parts together, then parts are secured, but adjustment and movement during assembly become impossible
Solution Approach 1:
The patent incorporates guide rails into the enclosure that pre-align and guide the circuit board into its correct position during assembly, allowing for easy positioning and adjustment before the final ultrasonic welding step secures the components in place
Solution Approach 2:
The patent uses spring-loaded electrical contacts that provide flexible electrical connection during assembly, allowing for minor movements and adjustments of the circuit board while maintaining reliable electrical connectivity, and only becomes rigid after final assembly
3Ease of manufacture
If traditional assembly methods are used, then parts can be joined, but manufacturing time and variability increase
Solution Approach 1:
The patent replaces multi-step mechanical assembly processes with automated ultrasonic welding that can quickly join thermoplastic components in a single operation, significantly reducing manufacturing time and improving consistency through automated process control
Solution Approach 2:
The patent changes the material selection to thermoplastic components that are compatible with ultrasonic welding, enabling the use of this high-speed joining process and improving both manufacturing efficiency and assembly consistency
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 approach reduces manufacturing time and costs, enhances safety by minimizing assembly errors, and provides consistent electrical connections with increased mechanical strength and cosmetic quality, while allowing for alignment adjustments without flexible printed circuit boards or high-heat welding.
Implementation Method 1
an electrical spring positioned within the enclosure to be in communication with the circuit board when the circuit board is positioned within the enclosure between the first guide rail and the second guide rail
Implementation Method 2
a cap that includes a fin that interlocks with the rib
Data Source
AI summary
A power adapter for powering portable electronic devices is disclosed. The modifications and enhancements to the power adapter can reduce or eliminate the need for adhesives, flexible circuitry, and/or wiring. The power adapter includes multiple guide rails used to guide a circuit board (carrying components) to electrical springs. The electrical springs provide not only an electrical coupling, but also a mechanical coupling. As a result, wiring and/or adhesives is not required. Additionally, a cap is secured to the enclosure through melting part of the cap by, for example, ultrasonic welding without causing damage to the circuit board, as welding location(s) is/are in locations away from the electrical springs and other sensitive components. The power adapter further includes a connector connected to the circuit board. During assembly, the circuit board can pivot in three dimensions during assembly to align the connector with the cap.