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Thermally efficient medical power supplies improve system reliability

17 March 2021

The LOF Series of open frame, AC-DC power supplies from Mornsun is available from Relec Electronics

State-of-the-art topologies & components combine with excellent ripple & dynamic performance in the LOF Series, available from Relec Electronics.

The medical power supplies, manufactured by Mornsun, are available from power conversion specialist, Relec Electronics. The LOF Series of open frame AC-DC power supplies meet multiple regulatory standards and are designed for thermal efficiency to improve system reliability and extend the life of the AC-DC converters.

They are designed to minimise local temperature hotspots and have excellent ripple and dynamic performance for reliable operation in medical environments.

There are three open frame AC-DC converters, LOF120, LOF225 and LOF350, in the LOF Series. The very high power density 120 to 350W AC-DC power supplies are in industry standard packages and offer up to 95% efficiency. Despite the compact form factors (from 101 x 50.0 x 25mm or 4.0” x 2.0” x 1.0”), they deliver output power up to 1.7W/cm3. Operating temperature range is -40°C to +85°C.

Each AC-DC converter series has outputs ranging from 12V to 48V, a universal AC input of 85 - 275Vac with power factor correction (PFC), very low earth leakage of less than 0.1mA, a high surge withstand threshold of 300Vac for five seconds, and no-load power consumption of less than 0.5W.

The LOF Series AC-DC converters from Mornsun are approved to EN60601 for medical equipment and can be used in Class I (with protective earth (PE) connection) or Class II (no PE) equipment.  

Leakage current is as little as 0.1mA, making the LOF Series suitable for patient contact and patient assistance equipment. The primary and secondary sides of the power supplies meet the reinforced insulation with 2xMOPP (Means of Patient Protection) and isolation voltage is up to 4000VAC.

The open frame power supplies also meet EN55032 – Class B, EN61000-3-2 – Class D, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6 and EN61000-4-11 and are approved to EN62368, EN61558 and EN60335.

Safety features include short circuit protection, over current, over voltage and over temperature protection.

Both convection and forced air-cooled ratings are available, with options to fit cases on all units.

In addition to competitive prices, the LOF Series has lead times of six weeks as standard. The power supplies are covered by the manufacturer’s three-year warranty and the experienced engineers at Relec are able to talk through a specific application to meet specific requirements.


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