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DC/DC converter in compact design: one for all

July 2021

Compact DC/DC converter HFBC60-W/Ks Photo: Autronic Steuer- und Regeltechnik GmbH
Compact DC/DC converter HFBC60-W/Ks Photo: Autronic Steuer- und Regeltechnik GmbH

The HFBC60-W/Ks for chassis installation offers an ultra-wide input voltage range from 14.4 volts DC to 154 volts DC with a power rating of 60 watts. This means that the DC/DC converter covers all international on-board voltages for rail vehicles (24 volts, 36 volts, 72 volts, 96 volts and 110 volts), including the tolerance range of +/- 40 percent required by EN 50155, with just one device. Companies operating throughout Europe can thus cost-effectively carry out the qualification of assemblies by using a single converter.

The “plug-and-play” concept has proven successful and enables an easy implementation in many applications. Typical applications for the HFBC60-W/Ks include fan controls, displays in passenger information systems, box PCs, locomotive driver cab displays, door opening systems, actuators for wheel flange lubrication systems, energy meters/tracking tools in trains and other applications which must be highly sturdy. The international standard EN 50155:2017 regarding damp heat, temperature, shock and vibration is of course fulfilled; the railway-specific criteria of EMC according to EN 50121-3-2:2016, such as surge, burst and ESD, are completely complied with without additional components. Immunity to interference and emitted interference via the cables and housing are within the limits of the criterion and class A. In addition, the converter has an integrated power failure bridging of 10 milliseconds (class S2) over the entire temperature and input range, which makes the compact converter (113 mm x 46 mm x 35 mm) unique. The power supply can be operated in the temperature range from -40 degrees Celsius up to 85 degrees Celsius - according to class OT4, ST1+ST2 - without derating.
An inrush current limiter and protective functions against overvoltage, overcurrent and overtemperature are integrated as standard. The converter can be started via the enable signal. The reverse polarity protection is solved passively, but there is a new version with active reverse polarity protection.
The converter is idle-proof and permanently short-circuit-proof, the output voltage can be adjusted by +7 percent and -10 percent by means of resistors, in order to compensate for losses via the lines, for example. The combination of booster and active clamp at the optimised operating point achieves a high efficiency of approximately 91 percent. Heat is dissipated via the lateral mounting surface. Available output voltages are 5 volts, 12 volts or 24 volts. Other output voltages or modifications to the unit can be made on request.