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Low leakage power supplies resuscitating medical technology

Published: 19 November 2015 - Lisa Peake
Powerbox introduces new products in the medical Medline family. The OFM30 30W extra low leakage power supplies are best in class EMC for medical systems in CF class, and its leading OFM225 225W series suitable for BF class expands with additional voltages
 
Designed to meet and exceed new safety standards for medical systems and equipment; and based upon an innovative building practice, reducing leakage current below 10 µA and EMC, the new Powerbox OFM30 series delivers 30W in continuous operation (peak up to 45W) features Class II double isolation and is UL/IEC60601-1 medically approved.
 
It is like the Holy Grail, trying to achieve low leakage current with low EMC, based on a very innovative design. The OFM30 combines both of them, 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 30W continuously, at 50ºC and free convection cooling; though it can respond to peak demands for extra power (e.g. pump systems), allowing up to 45W during 10 seconds, with repetition every 100 seconds. In case of over temperature, the OFM30 integrates a unique 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.
 
Addressing applications demands high reliability, the OFM30 exploits the benefits of a switching topology based on a front edge fly-back, optimized to reduce components count down to 65. This 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 12V / 2.5A (peak 3.75A), the OFM305026 delivering 15V / 2.0A (3A peak) and the OFM305028 delivering 24V / 1.25A (peak 1.875A). 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 (3 x 1.5 x 0.9 inch).
 
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.
 
“Safety in medical applications is a must, it is particularly important when designing power supplies for Cardiac Floating (CF) applications, when electrically connected to the heart of the Patient, to guarantee the highest level of security” says Martin Fredmark, VP Product Management. “Reducing the leakage current is always an important step forward and we are permanently working on new technologies to improve patient safety.”
 
Source: Irish Manufacturing


 
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