Dual Power Supply System for Railroad Car Illumination
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Solution Overview
Problem
Integrated power supply systems for railroad cars fail to ensure continuous illumination when a power supply device fails, leading to inadequate lighting during travel in tunnels or at night, causing passenger discomfort.
Innovation Solution
A dual power supply system comprising a first and second power supply device, each with a driving and control circuit, connected through an addition circuit that stabilizes power output by compensating for failures and utilizing a storage battery to maintain illumination during abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single integrated power supply device is used to supply power to multiple illumination devices, then the number of power supply devices is reduced and mounting space is saved, but the system reliability deteriorates because a single failure turns off all illumination devices
Solution Approach 1:
The power supply system is divided into multiple independent power supply devices (first power supply device and second power supply device), each capable of independently supplying power to the illumination devices. This segmentation allows the system to maintain partial illumination functionality even when one power supply device fails, thus resolving the contradiction between reducing the number of devices and maintaining reliability.
2Reliability
If multiple power supply devices are used to ensure continuous illumination, then the system reliability is improved, but the mounting space and device complexity increase
Solution Approach 1:
Multiple power supply devices are merged into a single power supply system that shares common control circuits and mounting infrastructure. The first and second power supply devices share the same control circuit board and mounting space, allowing the system to achieve high reliability through redundancy while minimizing the increase in mounting area and device complexity.
3Reliability
If power supply devices monitor each other to compensate for failures, then the illumination continuity is maintained, but the control system complexity increases
Solution Approach 1:
The power supply devices perform self-monitoring and automatic failover without requiring complex external control systems. Each power supply device monitors its own status and automatically switches to the other device when a failure is detected, maintaining illumination continuity through simple self-service mechanisms rather than complex inter-device control protocols.
Data Source
AI summary
A power supply system (120) according to an embodiment of the present invention includes a first power supply device (121), a second power supply device (122), and an addition circuit (123). The first power supply device (121) includes a first driving circuit that outputs a first direct current from a first power supply input and a first control circuit that controls the first driving circuit. The second power supply device (122) includes a second driving circuit that outputs a second direct current from a second power supply input and a second control circuit that monitors the first driving circuit and controls the second driving circuit. The addition circuit (123) is connected to an output terminal of each of the first and second power supply devices (121, 122) and outputs a third direct current that is a value obtained by adding the first and second direct currents to a load device (on-board illumination device (110)).