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High operating switch-mode power supplies

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article image Ifm's new switch-mode power suppliers.

FIVE new switch-mode power supplies from ifm efector combine high operating efficiency and compact dimensions with high levels of EMC performance.

Designed for operation from three-phase supplies between 400V and 500V, the new units have outputs adjustable from 24V to 28V dc, and are available with ratings of 5A, 10A, 20A, 30A and 40A.

All models have full-load to no-load regulation of better than 2%, and all can supply loads substantially in excess of their nominal rating for up to one minute.

This avoids the need to use a larger - and more costly - power supply to handle short-term maximum loads, such as those which often occur during equipment start-up.

Short-circuit and overload protection is provided as standard in all of ifm's new power supplies, with models rated at 20A and above incorporating a special "hiccup" mode.

The power supply automatically enters this mode when an overload or short-circuit is detected, and the output voltage is initially reduced to zero.

The output then pulses briefly at intervals to determine whether the fault condition has cleared. If it has, normal operation is automatically resumed.

Efficiencies of up to 92.5% guarantee power supplies run cool, and all provide a mains buffering time of 10mS or better to guard loads against the effects of mains transients.

The units may be operated in parallel to supply larger loads, and their readily adjustable output voltage makes them suitable for battery charging applications.

The units feature robust metal housings, with convenient screw terminal connections. They are CE-marked, and carry a wide range of international approvals, including EN 60950, UL 1950, UL 508 and CUL/CSA-C22.2.

EMC performance complies fully with the requirements of EN 50081-1 (Class B).

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