Half-brick DC/DC converters for railway power systems

An input range of 43 to 160Vdc enables their use with 72 or 110V nominal DC inputs. The baseplate cooled modules meet the rolling stock IEC 61373 Category 1, Class B shock/vibration standards and are designed to meet EN 45545-2 (fire protection on railway vehicles). Railway applications include LED lighting, communications, control and automated train subsystems.

With efficiencies above 90% and high efficiencies at low load, the reduced internal losses simplify the cooling of both the module and the ambient air. To more easily withstand the surge voltages present on electrified trains, the CN-B110 has increased spacing between the input and baseplate of up to 11.76mm. The input to output isolation is 3,000Vac, input to baseplate 2,500Vac and 500Vac output to baseplate.

Four output voltages are available: 12, 13.8, 15 and 24V. The standard modules feature an accurate current share circuit allowing up to eleven units to be paralleled for redundancy or for higher power requirements. Remote on/off, remote sense and a DC good signal are also available. Options include a 12V 10mA auxiliary voltage (replacing the DC Good signal), non-threaded mounting holes, and latching overvoltage and overtemperature protection. The baseplate temperature range is -40°C to +100°C with ambient temperature ratings of -40°C to +85°C. The CN-B110 series measures 57.9 x 61 x 12.7mm (W x L x H) and weighs 100g.

All models are safety certified to IEC/UL/CSA/EN 62368-1, meet the rolling stock IEC 61373 Category 1, Class B shock and vibration standards, and are designed to meet EN 45545-2, with CE and UKCA marking to the Low Voltage and RoHS Directives. The units also comply with EN 55011-A and EN 55032-A conducted and radiated emissions, IEC 61000-4 immunity standards with minimal external components.