Power solutions for rail transit

As a safe, efficient and environmentally friendly large-capacity transportation, urban and inter-city rail transit get a rapid development this year, which leads to a high-speed growth of urban rail high-speed rail equipment industry. However, there are very strict regulations for electrical and electronic equipment used on railway applications. EN50155 Railway applications-Electronic equipment used on rolling stock is the most commonly used in Europe and RIA12 in UK which more weights surge ability.

EN50155 standards

EN50155 standards is the primary reference for MORNSUN’s railway power converters. They fulfill specific specifications to reach this standard:

1. Input voltage range

Nominale ingangsspanning (Vin) ingangsspanningsbereik 0,7 (Vin) - 1,25 (Vin) laagste limiet (0,1s) 0,6 (Vin) Hoogste limiet (1s) 1,4 (Vin)
24V 17 - 30V 14V 34V
48V 34 - 60V 29V 67V
72V 50 - 90V 43V 101V
96V 67 - 120V 58V 135V
110V 77 - 137V 66V 154V

2. Ambient temperature 


Interne temperatuur van de cabine

Interne over-temperatuur na 10 min van de cabine luchttemperatuur rond de printplaat
T1 -25 / +55°C +15°C -25 / +70°C
T2 -40 / +55°C +15°C -40 / +70°C
T3 -25 / +70°C +15°C -25 / +85°C
TX -40 / +70°C +15°C -40 / +85°C

3. Shock and vibration according to EN50155 & IEC61373 standaard

Frequentie   5 - 150 Hz
Tijd   5 uur voor elke vertical as Z, X en Y
Versnelling   Z: 5.72 m/s², X: 2.55 m/s², Y: 3.96m/s²

Schok en


  Piek versnelling: Z: 30m/s², X: 30m/s², Y: 50m/s².

  Halve sinus puls: 30ms

4. Isolation voltage

Ingangsspanning Isolatiespanning
24V 500VAC / 50Hz, 1min
48V 500VAC / 50Hz, 1min
72V - 125V 1000VAC / 50Hz, 1min
125V - 315V 1500VAC / 50Hz, 1 min

Applications of the MORNSUN converters:

1. Subway Sliding Plug Door– DCU (Door Control Unit)

A sliding plug door is a door designed to seal itself with steps of plug and pull by taking advantage of pressure difference on its two sides and is typically used on subway, train and so on. First, DCU send information of door statue, safety monitoring, emergency switch and others to the cab. Then, the cab gives orders to all DCU to control the opening and closing of the sliding plug door.

To ensure the electrical safety and common-mode interference protection capability, CPU system, the internal door control unit, should isolate from the motor, signal acquisition and other equipment. Therefore, it’s recommended to select two power converters

In above diagram, the power supply of vehicle electronic equipment is 110VDC. MORNSUN 10W railway converter URB1D05LMD-10WR3 offers 5VDC powering CPU and URB1D15LMD-10WR3 does 15VDC powering motor driver chip. Both actual output power are about 6-8W.

URB1DxxLMD-10WR3 series are designed with the European standard EN50155 and meet the special requirement for isolation. They come in enclosed metal package with excellent thermal performance and good radiation protection. The series offer 2250VDC isolation (reinforced insulation) and 40-160VDC ultra-wide input voltage, suitable for 72V/96V/110V system.

2. Business-class Seat on High-speed Train

Business-class seat electric control system mainly consist of switching button, position sensor, electronic controller ECU and drive motor.The switching button and position sensor includes the electric switch (base, backrest, waist) and position sensor of them. And the Drive motor is used to flexibly adjust various seat statues (cradle seats, angled lie flat seats and fully flat seats) and manually reset in case of power turns off.

In above diagram, the power supply of railway vehicle electronic equipment is 110VDC, too. MORNSUN URF1D24QB-100W targeting railway offers 24VDC to power vertical motor, tilt motor and sliding motor on one hand. On the other hand, it connect with K7805-500R3 to convert voltage into 5VDC powering the electronic controller and position sensor.

About MORNSUN Power Converter for Railway Application:

1. Railway DC/DC Converter URB1D-LMD-10/15/20WR3 Series

De verbetering en opwaardering van het spoorwegnet zorgt voor een goed ontwikkelingspotentieel voor de spoorwegindustrie en hogere eisen voor isolatie. Om hieraan te voldoen ontwikkelde MORNSUN een DC/DC converter met 40 – 160VDC ultra brede ingangsspanning en 2250 VDC isolatie. De URB1D-LMD-10WR3 serie voldoet aan de EN60950/EN50155 standaard. Hierdoor zijn ze geschikt voor 72V, 96V en 110V elektronische apparatuur voor spoorwegvoertuigen zoals bijvoorbeeld controleapparatuur, airco controller en informatieborden.

Deze serie biedt een werkingstemperatuur van -40°C tot +85°C en meerdere beschermingen zoals ingang onderspanning-, uitgang kortsluit-, overstroom- en overspanningsbeveiliging. De EMI van de drie series voldoet aan EN50121-3-2 standaard zonder externe componenten. Bovendien komt de converter  in een standaard 2 x 1 inch internationale verpakking met twee mogelijke pin-out posities en een uitstekende compatibiliteit. Een A2S (chassis montage) of A4S (DIN-Rail montage) verpakking is ook beschikbaar op aanvraag.

Kenmerken van de URB1D-LMD-WR3 serie:

  • ultra wide input voltage range 40 – 160VDC
  • isolation voltage of 2250VDC, reinforced insulation
  • operating temperature: -40°C tot +85°C
  • multiple protections: UVP, OVP, SCP en OCP
  • low ripple and noise
  • international standard pin-out
  • reverse voltage protaction available with A2S (chassis mounting) and A4S (35mm DIN-Rail mounting)
  • meet EN50155 & EN60950 standard

2. DC/DC converter URF1Dxx-100W

URF1Dxx-100W is a railway power converter with high performance, featuring 100W output power, no min. load requirement and wide input voltage of 66-160VDC, and allow the high base plate temperature (up to 100℃). They also provide protections of input under-voltage, output over-voltage, short-circuit and over-temperature protection and have functions of remote control and compensation, output voltage regulation. The series meet railway standard EN50155, suitable for railway system.


  • wide input voltage 66 – 160VDC
  • high efficiency up to 92%
  • low no-load power consumption
  • isolation voltage of 3000VDC
  • operating temperature of -40°C tot +100°C
  • international standard package of 1/4de brick
  • EN50155 railway standard approva

3. Non-isolated DC/DC Converter K78(L)xx-500R3

K78xx-500R3 series including open frame cost-effective K78Lxx-500R3 are high efficiency switching regulators and compatible with LM78xx series three-terminal linear regulators. The series feature high efficiency, low standby power consumption and output short-circuit protection. They also have no requirement for heat-sink and support negative output, widely used in industrial control, instrumentation, and electric power applications.


  • high efficiency up to 95%
  • no-load input current as low as 0,2mA
  • operating temperature of -40°C tot +85°C
  • negative output available
  • pin-out compatible with LM78xx linear regulators
  • UL60950/EN60950 approved

With the rapid development of railway at home and aboard, the requirements for high reliability and EMC of power supplies gets higher and higher. MORNSUN railway power converters are ideal choices for you to simplify your design solution.

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