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DC-DC converters with extra wide input voltages for railway designs in distribution

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By Nick Flaherty


The OFQC40 and OFQC60 Series 40 and 60W quarter-brick DC-DC converters can accommodate a broad range of common battery and bus distribution voltages while operating with wide input voltage tolerances and fluctuations. They have a wide 12:1 input voltage range covering potential distribution voltages of 9-75 V DC or 14V to 160V DC, according to the EN50155 standard, which allows them to accommodate many different power systems within the railway environment.

Modern railways rely on a host of electronic systems in order to operate safely and provide passenger comfort and convenience. A typical railway carriage distributes either 72V or 110V DC of battery power to these various systems many of which require lower and regulated operating voltages.

Railway distributed power system designs incorporate DC-DC converters to convert the main battery voltage into the input voltage of the downstream electronic systems and DC-DC converters with a wide input voltage range can accommodate a greater number of power systems. In addition, the main battery power may also fluctuate when feeding higher power systems onboard the train, a DC-DC converter with a wider input range is better suited to handle such wide variations in voltage.

The converters have output voltages of 5, 12, 15, 24, 28, 48 and 53Vdc, isolation voltage up to 3000Vac, and efficiencies up to 92 percent. The EN55032 compliance for railway systems includes protection against over current, over voltage, under voltage, short circuits and over temperature, as well as RoHS and REACH compliance, although the CE Mark is currently pending.

The units come in a plastic case with aluminium baseplatewith an operating baseplate temperature range of -40°C to +105°C, and heat sink options are available.

www.greshampower.com

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