Baseplate-Cooled Power Supplies Boast 90% Efficiency In Harsh Environments

Fyfield, U.K.: XP Power’s CCH series of compact single-output baseplate-cooled 400-W and 600-W ac-dc power supplies is intended for harsh environment applications (see the figure). Up to 90% efficient, the supplies particularly suit sealed-box applications, where all heat-generating components are attached to the baseplate to allow heat dissipation through the sealed-box chassis or heatsink. No forced-air cooling is required.

Measuring just 214 by 102 by 43 mm (8.43 by 4.02 by 1.69 in.), the CCH supplies are up to 50% smaller than other baseplate-cooled products of a similar power level. Their high efficiency may also mean a smaller heatsink can be specified, reducing the overall footprint required.

Both the 400-W CCH400 and the 600-W CCH600 series accommodate the full universal input range of 90 to 264 V ac without derating, suiting them for designs used worldwide. These single-output units are available with the popular nominal output voltages of +12, +24, +28, or +48 V dc.

Compliance to MIL-STD-461 for emissions and MIL-STD-810 for shock and vibration ensure the CCH series fits use in commercial off-the-shelf (COTS) military applications in addition to a broad range of industrial and commercial equipment used in outdoor and harsh environments. The units also comply with the internationally recognised safety standard EN/UL 60950-1 for IT equipment and meet EN55022 level B conducted and level A radiated emissions.

A fully featured signal set includes remote on/off, remote sense, ac OK, and overtemperature warning and shutdown. A +5-V dc standby output is also provided. The supplies’ current-sharing capability allows for parallel sharing of the load across up to three CCH units. The CCH series has a wide operating temperature of –40°C to 70°C, with a maximum baseplate temperature of +85°C.

XP Power