Power Electronics / Power Management


Robust DC-DC converters

18 March 2009 Power Electronics / Power Management

The primary switched DC-DC converters of the PCMDS80 from MTM Power are specially designed for applications in vehicle and rail technology, but are also suitable for use in industrial and telecommunication applications. They are available with 80 W output power and operate according to the forward principle; ie, the DC input voltage is chopped by a transistor with a frequency of 50 kHz.

With the help of a transformer and a secondary linear choke, a galvanically isolated output voltage – 5,1; 12; 13,8; 24; 27,6 or 48 V – is produced which is adjusted by pulse-width modulation according to the current mode principle. The converters are available with three input ranges to cover battery voltages of 24, 36, 48, 60, 72, 80, 96 and 110 V according to EN 50 155.

The dimensions of the base plate version are 119 x 100 x 40 mm and of the heatsink version are 119 x 115 x 65 mm (l x w x h). The thermoselective vacuum encapsulation guarantees homogeneous heat dissipation within the modules as well as an excellent resistance against environmental influences such as shock, vibration and humidity. The converters need no ground load and are short-circuit protected by primary and secondary power limiting.



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