Overview
A railway or a transportation system runs from a widely varying, high-voltage DC source and must meet a set of stringent standards, so its power converter must accept the input swing, survive the surge and the temperature and meet the EN50155 compliance. Cincon provides the railway and the chassis DC-DC modules that do this, and BeiLuo supplies them with genuine traceability and FAE support. This page shows how they fit together in a railway power design.
The Wide Input
A railway battery or a high-voltage bus varies widely, from the nominal to a low or a high limit during a fault or a load change, so the converter must accept a very wide input. A Cincon EC7AW18 or EC7BW18 railway module covers about 10 V to 160 V DC, an 18:1 range, and the CQB50W chassis module covers about 14 V to 160 V, so a designer can power the auxiliary rails from the same source as the traction system. The module holds a regulated, isolated output across the range, and the EN50155 Class S3 and Class C2 ride-through means the output survives the supply variations without an external capacitor.
Transient and Surge
A rail system imposes a surge and a transient on the supply, so the converter includes an input reverse-polarity protection and a low inrush current, and the standards set the surge level. Confirm the protection and the ride-through against the project and add the external protection the standard requires.
The Isolation and the Standards
Arailway module meets the EN50155 for the rolling stock, the EN50121-3-2 for the EMC and the EN45545-2 for the fire behavior, with a 3000 VAC isolation that separates the input and the output for safety and noise immunity. The isolation also breaks the ground loop between the source and the load, which matters in a vehicle where the ground potential varies along the train. Confirm the standard and the class against the project, because the requirement differs between the applications.
Signaling and Control
A signaling cabinet and a control unit use the same modules for their rails, with the 5 V, the 12 V or the 15 V output and a single or a dual output. The family covers a range of output voltages, so a designer can power several rails from the same source and keep the spare parts simple.
The Mounting and the Thermal Design
A railway module often uses an enclosed chassis with a baseplate cooling and screw terminals, which suits a rack or a cabinet and conducts the heat to the mounting surface, so a fan is not needed. Mount the module on a good thermal path, confirm the baseplate temperature at the worst case and check the derating at the ambient, because the case temperature range reaches -40 to +100 degrees on the enclosed parts. The chassis format and the built-in filter of the larger parts simplify the installation.
Input Protection
Add the fuse and the transient protection the standard requires, keep the input wiring short and protected and confirm the reverse-polarity protection of the module. The input protection and the rail standard together decide the reliability of the design.
Verification
Validate the design on the bench by measuring the efficiency and the derating at the worst case, by imposing the input variations and the surge that the standard requires and by checking the output across the range. Our FAE team can review the measurements and the layout, so the design meets the standard on the first attempt.
Getting Help
Send your input range, the rails and the class, the mounting and the environment to our FAE team, and we will propose a railway or a chassis module, help confirm the compliance and review the thermal and the input protection. BeiLuo holds mainstream Cincon parts in regional stock and ships them with an import declaration, a certificate of origin and a RoHS compliance file, so a railway power design can move from prototype to production without a supply gap.