Vehicle Redundant Power Architecture Short-Circuit Protection
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Solution Overview
Problem
Traditional vehicle power distribution systems rely on a single power bus, making them susceptible to voltage fluctuations and performance issues due to short circuits, which can impact other electrical components and systems.
Innovation Solution
A power distribution system with multiple buses operating within a common voltage range, featuring switching devices and a controller that selectively enables power transfer and isolates buses when current thresholds are exceeded, ensuring redundant power supply and preventing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single power bus is used to provide power to all electrical devices, then the system structure is simple, but a short circuit condition in one device can decrease voltage to an unsatisfactory level and impact other electrical components
Solution Approach 1:
The single power bus is segmented into multiple independent power buses (first power bus and second power bus). Each bus can operate independently and supply power to different electrical devices. When a short circuit occurs on one bus, the other bus remains unaffected and can continue to provide power, thus maintaining voltage stability and system reliability.
2Reliability
If multiple power buses are used with switching devices to enable selective power transfer, then voltage stability and redundancy are improved, but the system complexity increases
Solution Approach 1:
Switching devices are introduced as intermediary components between the multiple power buses. These switching devices control the connection and disconnection between buses, enabling selective power transfer when needed. The switching devices manage the complexity by providing a controlled interface that allows the system to operate in different configurations (single bus operation or dual bus operation) without requiring complete system reconfiguration.
3Adaptability or versatility
If power transfer between buses is enabled to balance load, then system adaptability is improved, but the risk of current exceeding thresholds and causing voltage drops increases
Solution Approach 1:
The controller continuously monitors the current flowing through each power bus and uses this feedback information to make real-time decisions about enabling or disabling power transfer between buses. When the current in one bus exceeds a predetermined threshold, the controller automatically adjusts the switching devices to isolate the overloaded bus and prevent further current draw, thus avoiding voltage drops and protecting the system from harmful overload conditions.
Data Source
AI summary
A power distribution system for a vehicle includes a plurality of switching devices arranged in a circuit to selectively control power flow between a plurality of buses operating within a same voltage range. The power distribution system further includes a controller programmed to, in response to the switching devices being in a state to transfer power between the buses and a current flowing through one of the buses exceeding a predetermined current, operate the switching devices to isolate the buses.