Medical open frame power supplies perform in low airflow conditions

When designing equipment for medical, those two principles have to be considered, often requiring designers to develop products to operate in free air convection, limiting forced ventilation to peak demand. As the front of any system, the power supply has to deliver high performance in such environments and that’s what the Medline OBM03 and OBP03 series have been designed for.

Combining an optimised layout to facilitate natural air convection cooling with highly efficient switching topology, the OBM03 and OBP03 are designed for a continuous output power operation of 100 and 200W respectively in natural convection environment. When extra power is required, with limited forced air, the output power available increases, up to 150W at only 7.5 CFM for the OBM03 and up to 300W at 10CFM for the OBP03.

Designed for medical BF applications the OBM03 and OBP03 withstand an input-to-output isolation of 4,000VAC, input-to-ground of 1,500VAC and output-to-ground of 1,500VAC. At 264VAC the leakage current is below 275µA for the OBM03 and bellow 220µA for the OBP03.

In medical environment parasitic noise could impact on microvolt-sensors and other sensitive equipment, requiring extreme attention to conducted and emitted radiations. The OBM03 and OBP03 have a very efficient built in filter and loop less layout making those two products to meet EMC IEC60601-1-2 and ITE requirements, as well as EN55011/EN55022 class B both conducted and radiated.

“With the growing number of medical applications for patient-remote monitoring and concern for their comfort, it is very important for our customer to develop the most silent equipment and for that to rely on power supply highly performing in such environment,” Martin Fredmark, Vice President, Product Management, Powerbox, said: “The Medline series 150 and 300 have been designed to make them highly flexible, delivering high performance in natural condition with extra power available on demand under limited airflow.”

With a nominal input voltage of 100-240V 50/60Hz, seven available output voltages spanning from 12 to 48VDC, a typical power factor of 0.98 and an operating temperature window of 0 to 70°C, the power supplies fit nicely into a large number of medical applications worldwide. Other notable features are over voltage and over current protection and no load power of less than 0.5W without PFD or 1W with PFD.

The Medline OBM03 and OBP03 are packaged in an open frame 50.8x101.6x33mm (2x4x1.29”) for the OBM03 and in a low profile open frame 76.2x152.4x35.1mm (3x6x1.38”) for the OBP03. In addition to the open frame, the OBP03 is available in L-Bracket and Enclosed with integrated fan. The OBP03 includes as well an inhibit function.