Power Connector Safety Interlock for Hot Plugging
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Solution Overview
Problem
Power connectors face issues with 'hot plugging,' where live electrical connections or disconnections can cause damage, such as melting or welding of pins and sleeves, and potential arc flashes due to high switching energy.
Innovation Solution
A power connector design with a contact assembly that electrically connects and disconnects power while maintaining mechanical coupling, using an operating mechanism to manage the contact assembly and redirect switching energy away from the pins and sleeves, thereby preventing direct electrical arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins are inserted into sleeves to provide electrical pathway, then electrical connection is established, but switching energy causes damage such as melting, welding, or arc flash
Solution Approach 1:
The electrical connection system is divided into two separate functions: mechanical coupling (pins and sleeves) and electrical switching (contact assembly). This segmentation allows the mechanical connection to be established first, providing structural integrity, while the contact assembly handles the high-energy switching operations separately, preventing damage to the pins and sleeves.
Solution Approach 2:
The contact assembly acts as an intermediary element between the power source and the pins/sleeves. It mediates the electrical connection by making and breaking contacts internally, while the pins and sleeves maintain only the mechanical coupling relationship. This intermediary structure protects the pins and sleeves from direct exposure to switching energy.
2Object-affected harmful factors
If contact assembly opens and closes to disconnect power, then switching energy is redirected away from pins and sleeves, but device complexity increases
Solution Approach 1:
The contact assembly performs multiple functions within a single integrated structure: it provides electrical isolation, redirects switching energy, and maintains mechanical coupling. By combining these functions into one universal component, the design achieves protection against arc flash and welding without proportionally increasing overall device complexity.
Solution Approach 2:
The contact assembly is nested within the existing connector housing structure, utilizing the available space efficiently. The internal contacts are housed within the same external dimensions as traditional connectors, allowing the protective function to be added without significantly increasing the overall device size or complexity.
3Reliability
If mechanical coupling is maintained while electrical connection is made and broken, then safety is enhanced, but ease of operation is reduced
Solution Approach 1:
The contact assembly is designed to automatically maintain mechanical coupling through its own structural configuration. The interlocking mechanism and biasing elements ensure that the pins and sleeves remain mechanically connected during the switching operation, eliminating the need for additional user actions or complex control systems to maintain safety.
Data Source
AI summary
An electrical connection element is for a power connector. The power connector includes an electrical component having a number of first electrical mating members. The electrical connection element comprises: a housing including a number of second electrical mating members structured to be electrically connected to the number of first electrical mating members; a contact assembly enclosed by the housing and being electrically connected to the number of second electrical mating members; and an operating mechanism for opening and closing the contact assembly. The contact assembly is structured to electrically connect and disconnect power while the number of first electrical mating members remain mechanically coupled to the number of second electrical mating members.