Segmented DC Power Bus for Inrush Current Control
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Solution Overview
Problem
In railway signaling systems, the high number of consumers connected to a bus line leads to significant inrush current and voltage fluctuations when starting up, causing reliability issues and making it challenging to maintain power distribution over long distances with cost-efficient use of metallic conductors.
Innovation Solution
The power supply device employs a power bus with consumer bus coupling elements that divide the bus line into segments, using switching elements and small processors to manage the power flow, allowing sequential switching of consumers and integrating multiple direct current sources for balanced energy distribution, thereby controlling inrush current and voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If many consumers are connected to a single bus line for cost-efficient power distribution over long distances, then material efficiency and cost reduction are improved, but inrush current and voltage fluctuations increase significantly
Solution Approach 1:
The bus line is divided into multiple segments by bus coupling elements that can electrically isolate each segment. This segmentation allows the system to maintain cost-efficient long-distance power distribution while limiting the impact of inrush current to individual segments rather than affecting the entire bus line, thereby improving overall reliability
Solution Approach 2:
The bus coupling elements are pre-configured in a basic state where they electrically isolate bus segments. This preliminary isolation prevents inrush current from propagating across the entire system, and allows selective connection of segments as needed, maintaining both material efficiency and power supply reliability
2Adaptability or versatility
If many consumers are connected to a single bus line, then power distribution coverage is improved, but inrush current increases causing voltage drops
Solution Approach 1:
The bus line is segmented into isolated sections by bus coupling elements, allowing the system to expand coverage by adding segments without increasing the inrush current impact on the entire system. Each segment can be independently managed, maintaining stable voltage levels even as coverage expands
Solution Approach 2:
The bus coupling elements can dynamically switch between isolated and connected states, allowing the system to adapt its configuration based on operational needs. This dynamic control enables expanded coverage while managing inrush current by selectively connecting only the necessary segments
3Power
If bus coupling elements are used to segment the bus line, then inrush current control is improved, but device complexity increases
Solution Approach 1:
The bus coupling elements are designed to automatically manage segment isolation and connection based on predefined operational states. This self-service capability reduces the need for complex external control systems, achieving inrush current control while minimizing the increase in overall system complexity
Data Source
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AI summary
A power supply device (SV3') for supplying several loads (FE1, ..., FEn) with direct current for use in control and safety technology, wherein the loads (FE1, ..., FEn) can be connected via a 2-pole bus line of a first power bus to a first supply (PS1) in parallel to the first supply (PS1), wherein the bus line (L1) can be electrically connected to a further supply (PS2) for supplying current on both sides, is characterized in that the bus line is divided into bus segments by load bus coupling elements (VBA1 ... VBAn), that each load bus coupling element (VBA1 ... VBAn) comprises switching elements for electrically isolating the bus line, so that the bus coupling elements (VBA1 ... VBAn) can each be switched into a basic state and/or a first operating state in which the bus line (L1; L3) is connected by the corresponding load bus coupling element (VBA1 ...The bus segments are electrically interrupted (VBAn) and can be brought into a second operating state in which they are electrically connected via the corresponding consumer bus coupling element (VBA1 ... VBAn), and at least one of the consumers (FE1 ..FEn) is connected to one of the consumer bus coupling elements (VBA1 ... VBAn). This allows the consumers to be powered via a single bus line, keeping the inrush current low even with many consumers.