Medical range of low profile, high efficiency power supplies

3 mins read

COSEL has launched a wide range of low profile power supplies for medical applications.

The WMA series includes two families, the WMA-F and the WMA-H. The WMA-F has a universal input range of 85 to 264VAC and is available in three power levels, 35, 75 and 100W. Designed for medical systems integration the WMA-H is available in two power levels, 150 and 350W, and in two ranges of input voltage that is switch selectable. The overall WMA series complies with international safety standards for demanding medical applications and features an isolation grade of 2MOPP (IN/OUT) and 1MOPP (IN/FG).

Based on a robust platform using the latest power switching technologies, the units’ design is optimised to offer an excellent price/performance ratio for medical applications requiring a high quality power solution.

The WMA series is also suitable for demanding industrial fix applications requiring high isolation such as specified in Over Voltage Category III. The WMA-35-75-100F and WMA-150H are design optimised for convection cooling whilst the WMA-350H includes a fan for additional cooling and performance in demanding applications.

Medical applications need to be able to operate around the world and comply with many different safety regulations and new equipment requires power supplies to have a height measurement less than 1U (44.45mm - 1.75 inches). In order to accommodate this slim profile adopted by the medical industry manufacturers, the WMA series has a height of just 30mm.

The WMA series achieves a high efficiency level of up to 91% at high line, and utilising a limited number of components delivers both higher reliability and reduced cost.

The WMA series has also been designed for industrial applications such as semiconductors manufacturing equipment, complying with Semiconductor Processing Equipment Voltage Sag Immunity SEMI F47 and fix applications required to meet Over Voltage Category III.

The WMA series comprises five models: WMA35F, WMA75F, WMA100F, WMA150H and the WMA350H covering a power range from 35W to 350W. The WMA35F is available in four, single output voltages: 5V, 12V, 24V and 48V. The WMA75F, WMA100F and WMA150H are available in three single output voltages, 12V, 24V and 48V. The WMA350H is available in four single output voltages, 12V, 24V, 36V and 48V. With all models the output voltage can be trimmed using the built-in potentiometer.

The WMA-F series can be operated within a universal Input range of 85 to 264VAC, and designed for systems integration, the WMA-H can be operated in the range of 85 to 132VAC and 170 to 264VAC, switch selectable.

The WMA series includes inrush current limiting circuitry, and overcurrent and overvoltage protection. The power supplies can be operated in an environmental temperature range of -20 to +70 degrees centigrade. Depending on the final equipment assembly style and cooling conditions, a derating may apply.

With its medical and industrial focus, the WMA series’ input to output isolation complies with 2MOPP, and its input to Frame Ground (FG) complies with 1MOPP. The units are approved in accordance with UL62368-1, C-UL (equivalent to CAN/CSA-C22.2 No.62368-1), EN62368-1, ANSI/AAMI ES60601-1, C-UL (equivalent to CAN/CSA-C22.2 No.60601-1), EN60601-1 3rd, EN61558-2-16 (OVC III), and comply with IEC60601-1-2 4th Ed.

The WMA35-75-100F has no built-in active PFC though it complies fully with the IEC61000-3-2 (Class A). Designed for systems with integrated frontend PFC, depending on the final application the WMA150-350H may require external power factor correction circuitry.

The WMA series’ EMI emissions comply with CISPR11-B, CISPR32-B, EN55011-B, EN55032-B, FCC Part 15-B, FCC Part 18-B and in EMC immunity with EN61000-4-2, 3, 4, 5, 6, 8, 11.

For strength and longevity, the WMA series is built on an aluminium chassis and enclosed in a hot-dip galvanised steel board (SGCC) case. The WMA35F measures 30 x 82 x 99mm [1.18 x 3.23 x 3.90 inches] (W x H x D), and has a weight of 200g max. The WMA75F measures 30 x 97 x 99mm [1.18 x 3.82 x 3.90 inches] (W x H x D), and has a weight of 250g max. The WMA100F measures 30 x 97 x 129mm [1.18 x 3.82 x 5.08 inches] (W x H x D), and has a weight of 300g max. The WMA150H measures 30 x 97 x 159mm [1.18 x 3.82 x 6.26 inches] (W x H x D), and has a weight of 500g max. The WMA350H measures 115 x 30 x 215mm [4.53 x 1.18 x 8.46 inches] (W x H x D), and has a weight of 800g max.

The WMA series comes with a five-year warranty and conforms to the European RoHS and Low Voltage Directives.