Acquired Electronics360

Medical Devices and Healthcare IT

Medical Open Frame Power Supplies Perform in Low Airflow Conditions

23 September 2015

The Powerbox Medline series 150 and 300 AC/DC single output open frame (2x4 and 3x6) power supplies target medical type BF applications requiring high performance in low airflow conditions.

In medical applications, noise and parasitic disturbances are a design consideration. Designing equipment for medical applications often requires designers to develop products to operate in free air convection, limiting forced ventilation to peak demand. The power supply must deliver high performance in such environments, which occurs with the Powerbox OBM03 and OBP03 devices.

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

Designed for medical BF applications, the OBM03 and OBP03 withstand an input-to-output isolation of 4000VAC, input-to-ground of 1500VAC and output-to-ground of 1500VAC. At 264VAC, the leakage current is below 275µA for the OBM03 and below 220 µA for the OBP03.

In medical environments, parasitic noise can impact microvolt-sensors and other sensitive equipment, requiring extreme attention to conducted and emitted radiations. The OBM03 and OBP03 have an efficient built-in filter and loop-less layout facilitating compliance to EMC IEC60601-1-2 and ITE requirements, as well as EN55011/EN55022 class B both conducted and radiated.

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 70ºC, the new power supplies fit into a large number of medical applications worldwide.

The Medline OBM03 and OBP03 are packaged in an open frame 2 x 4 x 1.29” (50.8 x 101.6 x 33 mm) for the OBM03, and in a low profile open frame 3 x 6 x 1.38” (76.2 x 152.4 x 35.1 mm) for the OBP03. In addition to the open frame configuration, the OBP03 is also available with an L-Bracket and a full enclosure with an integrated fan. It also includes an inhibit function.

Medline 150 OBM03 and Medline 300 OBP03 products meet, among others, safety standards UL ES and CSA 60601-1 and 60950-1, and environmental RoHS.

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