In-Vehicle Display System DC Power Backup
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Solution Overview
Problem
Existing in-vehicle information display systems for trains fail to provide continuous information to passengers during power outages or failures in the power supply system, such as when the power from wiring stops.
Innovation Solution
An in-vehicle information display system that includes display devices capable of operating on alternating-current power from wiring conversion or direct-current power from a power storage device, with a terminal device distributing guidance information directly to some display devices, allowing them to operate on DC power from the power storage device, ensuring continuous guidance display even during power failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display system uses power from wiring (AC power through power conversion device), then the display can provide guidance information under normal operation, but the display stops operating when power supply from wiring stops due to failures
Solution Approach 1:
The power storage device is pre-charged during normal operation to store energy before potential power failures occur. This preliminary energy storage ensures that display devices can continue operating on DC power from the storage device when wiring power supply stops, thereby maintaining guidance display continuity without adding complex real-time power switching systems.
2Reliability
If the system uses power conversion device to convert wiring power to AC power for display devices, then the display can operate during normal power supply, but the display fails when power conversion device malfunctions
Solution Approach 1:
The power storage device acts as an intermediary between the wiring power supply and the display devices. During normal operation, it receives power from the wiring (either directly or through the power conversion device). When the power conversion device fails, the storage device directly supplies DC power to compatible display devices, bypassing the failed conversion device and maintaining system operation.
Solution Approach 2:
The system changes the power supply parameter from dependent on power conversion device output to direct DC power from storage device. Display devices that can operate on DC power switch their power source from the power conversion device to the power storage device when conversion device failure is detected, thereby adapting to the changed power availability conditions.
3Reliability
If all display devices receive power from the power conversion device, then the system is simple to manage, but the entire display system fails when power conversion device fails
Solution Approach 1:
The display device population is segmented into two groups: those powered by the power conversion device and those powered directly by the power storage device. This segmentation ensures that when the power conversion device fails, the segment connected to the power storage device continues to operate, providing fault tolerance. The segmentation is managed through simple power connection configurations rather than complex control systems.
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
Enables the continued provision of guidance information to passengers by using power from a power storage device, ensuring the display system remains operational during power outages or failures, such as when the power collector or power conversion device malfunctions.
Implementation Method 1
a power storage device (8) in each vehicle
Implementation Method 2
power conversion device that converts the power supplied from the wiring into power for operating the display devices
Data Source
AI summary
An in-vehicle information display system includes a plurality of display devices each of which operates by receiving supply of alternating-current power obtained by converting power from a wiring or of direct-current power output from a power storage device and each of which performs guidance display to passengers, and a terminal device that operates by receiving supply of direct-current power from the power storage device and that distributes guidance display information used for the guidance display toward the display devices. The terminal device directly transmits the guidance display information to a part of the display devices, each of the display devices acquires the guidance display information from the terminal device either directly or via another display device, and the display device that acquires the guidance display information directly from the terminal device among the display devices operates by receiving supply of direct-current power from the power storage device.