Low leakage power supplies resuscitating medical technology

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By eeNews Europe

The Powerbox OFM30 series is designed to meet and exceed safety standards for medical systems and equipment and  delivers 30 W in continuous operation (peak up to 45 W) features Class II double isolation and is UL/IEC60601-1 medically approved.

The OFM30 achieves low leakage current with low EMC.  The device is capable of reaching a leakage current below 10 µA and an EMC Class B average margin of 6dB.

Combining low power loss switching topology and selected components, the OFM30 series has an efficiency up to 88% whilst, fulfilling the Green Mode requirements of IEC60950-1, CEC Level V, EISA and ErP, at zero load. The OFM30 power consumption is below 0.3W thus assuring the family of its green credentials.

The OFM30 output power is rated at 30 W continuously, at 50ºC and free convection cooling; though it can respond to peak demands for extra power (e.g. pump systems), allowing up to 45 W during 10 seconds, with repetition every 100 seconds. In case of over temperature, the OFM30 integrates a protection system operating with linearity, reducing the output power down to 50%, securing the payload to proceed to all appropriated processes to avoid treatment disruption.

The OFM30 exploits the benefits of a switching topology based on a front edge fly-back, optimized to reduce components count down to 65. The lower number of components contributes to higher reliability, resulting in an MTBF over 500,000 hours and a minimum lifetime expectation of 80,000 hours.

The OFM30 series includes three models: OFM305025 delivering 12 V / 2.5 A (peak 3.75 A), the OFM305026 delivering 15 V / 2.0 A (3 A peak) and the OFM305028 delivering 24V / 1.25 A (peak 1.875 A). In case of a need for redundancy or extra power, all products can be connected in parallel without any additional external components. The product is available in an open frame format of 75.5 x 37.3 x 23 mm.

The OFM30 series is safety approved according to IEC 60601-1 ed.3, with CB’s by ETL Intertek Semco, and complies with other related IEC 61000 applicable standards and environmental norms RoHS, REACH and WEEE.

In addition to the Medline OFM30, Powerbox has expanded the company’s Medline OFM225 with two additional voltages, the OFM2255225 delivering 12 V / 11.25 A (peak 21.66 A) and the OFM2255226 delivering 15 V / 6.66 A (19A).

With a high degree of focus on reliability, using ‘One Step Conversion’ topology, which integrates a PFC delivering high performance at only 50% load, the OFM225 has the ability to safely operate in low airflow conditions, delivering 225W at 40ºC ambient in natural convection and up to 325 W continuous at 12 CFM forced air cooling. The unit can also be operated in parallel mode and includes advanced protection for business continuation.

Intended for type BF applications the unit can withstand 4000 VAC from input to both output and ground, has a leakage current of <100µA, and meets class B EMC requirements. The OFM225’s performance is ideally suited to powered respiratory and anaesthesia dialysis equipment.

Medline 225 OFM225 series meets safety standards IEC 60601-1 and 60950-1, EMC IEC60601-1-2, IEC61204-3, and EN55011 Class B as well as corresponding North American versions. The device also meets the environmental norms RoHS, REACH and WEEE.


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