DC/DC Converter Single Output – Railway Applications

This fully encapsulated, railway quality DC/DC converter uses field-proven technology to generate the required output power. The design is based on field-proven topology, which has a track record in numerous applications. The use of the latest semiconductor technology enables lower component count than earlier generations. Comprehensive electronic protection, generous design headroom and the use of components with established reliability ensure high MTBF. The unit is entirely potted with a thermally conductive MIL-grade silicon rubber compound which provides immunity to shock, vibration and humidity. An optional built-in redundancy diode allows for parallel and N+1 operation. Cooling is by conduction via a base plate to a heat-sinking surface.

Main Features

  • High voltage output 58 to 300Vdc options
  • Designed to rail standards EN50155 & EN50121
  • Fully potted with thermally conductive MIL-Spec silicon rubber compound
  • Rugged design for on-board train applications
  • Wide input voltage range
  • Convection / Conduction cooled: No fans
  • Fully isolated input-output 3000VDC
  •  Overvoltage protection
  • Overload and short circuit protection
  • MTBF > 160,000hrs
  • Specials input/output combinations on request

Rugged Mechanical Designs

Helios power supplies are ruggedly constructed and can be customized for specific mechanical requirements. Standard mechanical packages and ruggedization options include:

  • Chassis and wall-mountable units in vented conduction/convection or fan-cooled enclosures
  • DIN-rail and open-frame format available for many designs
  • Plug-in (Eurocard) format for modular power systems in 19 inch or 23-inch racks
  • Conformal coating and ruggedizing are standard
  • Full encapsulation (potting) in a thermally conductive MIL-grade silicon rubber compound with UL94V-0 flammability rating for immunity to high levels of shock and vibration, humidity, moisture, dust, salt, oil, insects and other contaminants
  • Enclosure in rugged, IP66- or IP67-rated waterproof, dustproof and explosion-proof die-cast aluminium packages. These enclosures also protect internal electronic boards from condensation and the ingress of oil, salt, sand, insects and other environmental contaminants
  • Custom connections
  • Portable DC Power Supplies


ModelOutput ( V)Output ( A)Power (W)
RWY300H58V ~ 300V5A   300W


Operating input voltage range24VDC   ( 14.4 ~ 34 )
36VDC   ( 22 ~ 51 )
48VDC   ( 20 ~ 67)
72VDC   ( 43 ~ 101)
96VDC   ( 58 ~ 135)
110VDC   ( 66 ~ 154)
Input ProtectionReverse polarity protection.Inrush current limiting Lower voltage than specified will not damage unit
Output VoltageSee  table
Regulation±1% Line / Load combined
Operating Temp: -40ºC to +70ºC cold plate temperature
EfficiencyModel dependent , typically 80-90%
Dynamic ResponseMax ±5% diviation for 10% – 50% load step wuth 1msec recovery
MTBF>160,000 hrs

You may also like...