DC-DC converters handle wide voltage variations

14th February 2019
Mick Elliott

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.

Gresham Power Electronics, now has available the Polytron extra wide input range DC-DC converters specifically designed for railway applications. These new products can accommodate a broad range of common battery and bus distribution voltages while operating with wide input voltage tolerances and fluctuations.

The OFQC40 and OFQC60 Series 40W and 60W quarter-brick DC-DC converters feature 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. The wide input range allows the OFQC converters to accommodate many different power systems within the railway environment.

Additional features and characteristics include output voltages of 5, 12, 15, 24, 28, 48 and 53V DC; isolation voltage up to 3000V AC; efficiencies up to 92% and EN55032 compliance.

The devices also offer protection against over current, over voltage, under voltage, short circuits and over temperature and are RoHS and REACH compliance with CE Mark pending.

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