Train

Polyamp has continuously supplied switch mode DC/DC converters to the international railway industry since 1973. The Company now has the capability to meet performance requirements of worldwide applications and to accommodate the extreme environmental demands of hot and humid Bangkok, hot and dry Australia and the arctic north of Sweden

System Applications

All Polyamp DC/DC Converters for railway applications are designed to be safe, technically compliant, reliable and cost effective.

Applications include systems for surface and underground trains powered by both electric and diesel locomotives, trams and special vehicles used by the operators and maintainers. Systems can be categorised as:

Train systems
Systems used by the driver are specifically safety conscious and a fault will either stop the train or automatically revert it to an alternative fail safe mode.

Driver computer
Train control
Remote control
Emergency starting
Radio
Head and backlight (Xenon/Halogen/LED)
Alarm (bells/horns)
Wipe washers
Cameras

Passenger comfort systems

Displays & information
Lamps (Halogen/LED)
IT-equipments
Sound/Communication
Toilets
Coffee & Restaurant

Railway operating systems

Counting devices, ticketing
Remote control
Cameras
Doors
Lifts including disabled facilities

Technical Standards
Modern trains achieve savings of weight and space by using battery voltage up to 110Vd.c. but most system equipments require input power at 12V and 24Vdc. The DC/DC Converter transforms the basic 110Vdc to 12 and 24Vdc, but can also perform the inverse if necessary. i.e. convert 12 and 24Vdc to 110Vdc.

Train standards
Polyamp DC/DC Converters are designed to meet the railway specific standards for electronic equipment onboard trains including those specified in EN50155 and IEC60571. They are mechanically rugged for reliable operation in a very harsh environment throughout their whole life

Where these standards specify different levels for particular conditions, applicable ratings will be confirmed and agreed for individual customer applications.

An additional benefit of the Polyamp DC/DC Converters is that when they are used as a power source for equipments, that in themselves are not compliant with the EN50155 and IEC60571 standards, they effectively function as a filter and galvanic separation to shield those equipments. This allows the railway operator to use Commercial Off The Shelf (COTS) equipments for such applications.

Environmental specification

Ambient temperature
The standard level is -25 to +55°C but most applications specify -25 to +70°C (T3).
Polyamp DC/DC Converters can be supplied to operate in temperatures from -40°C to +85°C.

EMC
Compliant with the EN50121-3-2 and IEC62236-3-2 EMC performance specified for electronic equipments.

Shock and vibration
Compliant with the IEC/EN61373 requirements for body mounted class B.

Polyamp DC/DC converters are regularly used in military vehicles and fork lifts, which have more severe vibration requirements

Range of DC/DC Converters
EN50155 and IEC60571 specify a nominal input variation of ±30% including ripple but some other specifications define ±40%. For modern trains with better d.c. supply systems they can be relaxed and for markets still using RIA12 specifications, Polyamp can also supply models that meet its surge requirement of 3.5x nominal input voltage.,,,

Train

Train

Updated: October 06, 2006

Polyamp AB
Box 229
SE-597 25 Åtvidaberg, Sweden
Tel: +46 120 854 00 Fax: +46 120 854 05