DC-DC Converter compliant to Railway Standard EN50155

Railway applications - Electronic equipment used on rolling stock

intreXis AG has an extensive experience in the design of DC-DC converters according to the EN 50155 and has already developed many power supplies for railway applications. The intreXis DC-DC Converters are fully compliant to the latest version of the standard EN 50155:2021. DC-DC converter for use "on rolling stock" differ in essential  points from standard equipment.

Temperature:

For the DC-DC converter, usually the so-called "Operating temperature class" is relevant. The standard defines the classes OT1 (-25 .. +55°C), OT2 (-40 .. +55°C), OT3 (-25 .. +70°C), OT4 (-40 .. +70°C), OT5 (-25 .. +85°C) and OT6 (-40 .. +85°C).
In addition defines the standard new the "Switch-on extended operating temperature" classes ST0, ST1 and ST2.
intreXis DC-DC converters meet the most demanding class OT6 respectively OT4 + ST1&ST2. This means the full output power is available throughout the widest and extended temperature range class from -50°C to 85°C, without derating and without fan.

Input voltage:

According to the standard the system voltage can vary in the range 0.6 U_N and 1.4 U_N, This results in the following voltage ranges: 

• Nominal 24 V: 14.4 .. 33.6 V
• Nominal 36 V: 21.6 .. 50.4 V
• Nominal 72 V: 43.2 .. 100.8 V
• Nominal 110 V: 66 .. 154 V

The ultra-wide input voltage of the range of the intreXis Boardnet Converter Platform allows the use of the intreXis DC-DC Converters in railway applications with all nominal input voltages (24 V, 36 V, 48 V, 72 V, 110 V) without changing the configuration.

Interruptions of voltage supply:

Due to a short circuit on a DC supply distribution line the input voltage may reduce to 0 V for a short period. There are three classes of interruption:

• S1: In case of voltage interruption, no performance criterion is requested but the equipment shall continue to operate as specified after the voltage interruption.
• S2: In case of voltage interruption up to 10 ms the output voltage of the converter should not drop
• S3: In case of voltage interruption up to 20 ms the output voltage of the converter should not drop

Vibration:

The devices must be shock and vibration resistant. The EN50155 refers to the relevant standard EN 61373.

EMC:

For the electromagnetic compatibility is a test according to the standard EN 50121-3-2  required. The most important criteria are:

• Conducted emissions 150kHz - 30MHz: basic standard EN 55016–2-1 but higher limits then class A: 150 kHz - 500 kHz 99 dBµV quasi-peak, 500 kHz - 30 MHz 93 dBµV quasi-peak
• Radiated emissions 30MHz - 1GHz: basic standard EN 61000-6-4, limits class A
• Fast transient bursts: basic standard EN 61000-4-4, ±2kV
• Surges: basic standard EN 61000-4-5 but higher source impedance (42R instead of 2R), ±2kV line to ground, ±1kV line to line

Convince yourself about the advantages of the ex stock available intreXis DC-DC Converters for Railway Applications!
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