Rotary Switching System for 48V Arc Management
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Solution Overview
Problem
The increased electrical voltage in motor vehicle systems, such as from 12 volts to 48 volts, leads to arc formation issues during mechanical switching, requiring larger contact gaps and longer switching times, which is inefficient and poses a problem in quick switching during malfunctions or accidents.
Innovation Solution
A switching system with a first and second disk, where the second disk is rotatable about an axis of rotation, featuring multiple identical fixed and moving contacts made of erosion-resistant materials, allowing for series connection and arc formation at multiple points to manage high voltage efficiently, and a latch mechanism to ensure reliable interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the electrical voltage is increased to 48 volts to reduce current flow and cable weight, then energy efficiency is improved, but arc formation during switching increases and switching reliability deteriorates
Solution Approach 1:
The switching operation is divided into multiple sequential stages: pre-arc contacts close first to establish a parallel path, then main contacts close, and finally pre-arc contacts open after main contacts are established. This segmentation allows the high voltage to be managed in controlled steps, reducing arc formation while maintaining switching reliability at 48 volts
Solution Approach 2:
Pre-arc contacts serve as intermediary elements that facilitate the switching process. These contacts establish an initial conductive path before the main contacts close, allowing the arc to form on the pre-arc contacts instead of the main contacts. This intermediary mechanism protects the main switching contacts from arc damage while enabling reliable high-voltage switching
2Object-affected harmful factors
If the contact gap is increased to prevent arc formation at 48 volts, then arc suppression is improved, but switching duration increases and quick switching capability deteriorates
Solution Approach 1:
The contact gap is segmented into two distinct gaps: a smaller gap for pre-arc contacts and a larger gap for main contacts. The pre-arc contacts operate with a smaller gap that can close quickly, while the main contacts handle the full voltage with appropriate spacing. This segmentation enables fast switching without compromising arc suppression
Solution Approach 2:
The pre-arc contacts perform a preliminary action by closing before the main contacts. This preliminary closure establishes a conductive path that allows the main contacts to close with larger spacing without causing excessive arc formation, thereby achieving both fast switching and effective arc suppression
3Reliability
If multiple identical contacts are used in series connection to manage high voltage, then voltage management is improved, but device complexity increases
Solution Approach 1:
The pre-arc contacts and main contacts use identical or similar contact structures and materials, allowing the same component design to serve multiple functions: voltage division, arc management, and current conduction. This universality reduces the variety of unique parts needed while achieving reliable high-voltage management
Solution Approach 2:
The contact elements are made from the same erosion-resistant material and have similar geometric characteristics, creating a homogeneous structure that simplifies manufacturing and maintenance. The homogeneity of the contact elements reduces device complexity while maintaining the ability to manage 48-volt operations through series connection
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 system effectively reduces arc formation and shortens switching duration, maintaining reliability and efficiency even at high voltages, while minimizing space and manufacturing costs, and preventing unintentional switching.
Implementation Method 1
Due to the increased electrical voltage, however, mechanical switching of the current flow results in the formation of an arc
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a switching system (4), in particular of an on-board electrical system of a motor vehicle, comprising a first disc (22) which has a first stationary contact (38), a second stationary contact (40), a third stationary contact (42), and a fourth stationary contact (44). The second and the third stationary contact (40, 42) are electrically contacted by means of a first contact bar (46) of the first disc (22). The switching system (4) comprises a second disc (26) which has a first movable contact (58), a second movable contact (60), a third movable contact (62), and a fourth movable contact (64). The first and the second movable contact (58, 60) are electrically contacted by means of a second contact bar (66) of the second disc (26), and the third and the fourth movable contact (62, 64) are electrically contacted by means of a third contact bar (68) of the second disc (26). The second disc (26) is rotationally mounted about a rotational axis (21) relative to the first disc (22), wherein all the contacts (38, 40, 42, 44, 58, 60, 62, 64) are electrically connected in series in an angular position. The invention further relates to a circuit breaker (2) comprising a switching system (4).