Half brick DC/DC converters for railways have a 43 to 160V DC input
Designed for railway power systems, the CN-B110 is a series of half brick DC/DC converters with an input range of 43 to 160V DC. TDK-Lambda advised that this wide input range enables the power supplies to be used with 72V 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).
The modules can be used in a variety of railway applications include LED lighting, communications, control and automated train subsystems.
Efficiencies are above 90 per cent and the DC/DC converters exhibit high efficiencies at low load, said the company, and the reduced internal losses simplify the cooling of both the module and the ambient air. In order to withstand the surge voltages typical in electrified trains, the CN-B110 has increased spacing between the input and baseplate – up to 11.76mm. The input to output isolation is 3,000V AC, input to baseplate 2,500V AC and 500V AC output to baseplate.
There are four output voltages available: 12, 13.8, 15 and 24V. The standard modules feature a current share circuit allowing up to 11 units to be paralleled for redundancy or for higher power requirements. Remote on/off, remote sense and a DC good signal are also available.
TDK-Lambda offers options including a 12V 10mA auxiliary voltage (replacing the DC Good signal), non-threaded mounting holes, and latching over-voltage and over-temperature protection. The baseplate temperature range is -40 to +100 degrees C with ambient temperature ratings of -40 to +85 degrees C.
The CN-B110 series measures 57.9 x 61 x 12.7mm and weighs 100g.
In addition to railway-related safety standards, the CN-B11 series is 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.
