Alternating Vehicle Power Branch Switching
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Solution Overview
Problem
In motor vehicles, a fault in one electrical consumer can affect the entire electrical system, leading to inoperability and increased component costs due to the need for redundant voltage sources.
Innovation Solution
A vehicle electrical system device with two branches and a switching device that alternately connects and disconnects consumers from a voltage source, isolating faults to prevent system-wide failures, using buffer stores for continuous energy supply and a test device to ensure fault detection and switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electrical system supplies all consumers, then the system structure is simple and cost-effective, but a fault in one consumer can affect the entire system and cause system-wide failures
Solution Approach 1:
The electrical system is divided into two independent branches (first branch and second branch), each capable of supplying power to consumers independently. This segmentation isolates faults to individual branches, preventing system-wide failures while maintaining overall system reliability.
2Reliability
If redundant voltage sources are provided for essential consumers, then system reliability improves, but component costs increase significantly
Solution Approach 1:
A single voltage source serves both branches universally, eliminating the need for separate redundant voltage sources. The voltage source can switch between supplying the first branch or the second branch, providing reliable power to essential consumers without duplicating expensive voltage source components.
Solution Approach 2:
The system dynamically switches between the first and second branches using a changeover device. This dynamic switching allows a single voltage source to serve multiple functions and multiple consumers sequentially, providing redundancy without requiring duplicate voltage sources.
3Productivity
If the voltage source continuously supplies power to all consumers, then power availability is maximized, but fault propagation risk increases
Solution Approach 1:
The electrical system is segmented into two isolated branches with a changeover device that prevents simultaneous connection of both branches to the voltage source. This segmentation blocks fault propagation between branches while maintaining continuous power availability through sequential switching.
Solution Approach 2:
The changeover device acts as an intermediary between the voltage source and the two branches. It controls and mediates the connection, ensuring that only one branch is connected at a time, thereby preventing fault propagation while maintaining power supply continuity.
Data Source
AI summary
The invention relates to an electrical on-board network device (11) for supplying at least two electrical consumers (21, 22) with an on-board network voltage (U) in a motor vehicle (10), the on-board network device (11) having a connection unit (18) for receiving the on-board network voltage (U) from a voltage source (12) and a first on-board network branch (14) for connecting one or some of the consumers (21) and for forwarding the on-board network voltage (U) to each connected consumer (21). According to the invention, a second on-board network branch (15) for connecting each other consumer (22) and for forwarding the on-board network voltage (U) to each other consumer (22) is provided, and the connection unit (18) is connected via at least one switching element (26) both to the first on-board network branch (14) and to the second on-board network branch (15), and a control unit (27) is designed to electrically couple the connection unit (18) to the first and the second on-board network branch (15) in alternation by switching the at least one switching element (26).