Progressive Contact Switch With Sacrificial Contacts for Arc Erosion
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Solution Overview
Problem
Existing switches experience premature failure due to contact erosion and increased impedance caused by arcing and heat during current flow, leading to reduced reliability and conductivity.
Innovation Solution
A progressively contacting switch with sacrificial and conducting contacts, where sacrificial contacts made of durable materials with higher melting points and lower conductivity initiate contact first, followed by conducting contacts with higher conductivity, to absorb arc erosion and heat, thereby extending switch lifespan and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switches are used in battery management systems, then the switching operations can be performed, but contact bounce and switching noise occur causing system instability
Solution Approach 1:
The patent replaces mechanical contact-based switches with electronic switches (MOSFETs or IGBTs) controlled by a control unit. The control unit receives switch signals and generates drive signals to control the electronic switches, eliminating mechanical contact bounce and switching noise while maintaining the switching function in the battery management system.
2Reliability
If protection circuits are added to eliminate contact bounce and noise, then system stability improves, but circuit complexity and cost increase
Solution Approach 1:
By substituting mechanical switches with electronic switches, the patent eliminates the need for complex protection circuits that would be required to mitigate contact bounce and noise. The electronic switches inherently provide cleaner switching operations, simplifying the overall circuit design while maintaining system stability.
3Productivity
If mechanical switches are used for switching operations, then the switching function is achieved, but contact bounce and noise are generated
Solution Approach 1:
The patent maintains the switching operation capability by using electronic switches (MOSFETs or IGBTs) that are controlled by a control unit. These electronic switches perform the same switching function as mechanical switches but without generating contact bounce or switching noise, thus eliminating the harmful factors while preserving productivity.
Data Source
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AI summary
A progressively contacting switch includes a set of contacts connected to an input. The set includes a first sacrificial contact formed of a first metal and a first conducting contact formed of a second metal. The switch further includes a movable set of contacts connected to an output. The movable set includes a second sacrificial contact formed of the first metal and a second conducting contact formed of the second metal. The switch includes an element configurable to connect the movable set of contacts such that the first sacrificial contact connects to the second sacrificial contact at a first time, thereby causing a current to flow from the input to the output, and while the first sacrificial contact remains connected to the second sacrificial contact, the first conducting contact connects with the second conducting contact at a later time.