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Medical Electronics


which references CISPR11 and the IEC 61000- 4-x series of EMC standards. These standards encompass emissions and immunity tests needed for commercial, industrial, and IT equipment. However, to cater to potential forms of external interference, edition 4.1 of IEC 60601-1-2 introduces new tests for magnetic field immunity in the 9kHz to 13.56MHz frequency range.


Another significant change with the newest edition of IEC 60601-1-2 is the addition of emissions, AC dips, and dropout testing at the extremes of the input AC voltage range rather than just at nominal. This new stipulation is intended to reflect various operating environments, and depending on what they are, the specification includes a choice of severity/immunity levels.


It is widely recognized that there is typically a trade-off between achieving low leakage current and minimizing conducted EMI as the ‘Y’ capacitors used to reduce common-mode EMI also have the effect of coupling leakage current to an earthed chassis or outputs. Consequently, this challenge has steered the design of power supplies towards inherently low-noise topologies, such as resonant types. Fortunately, these topologies often result in enhanced efficiency, bringing additional advantages.


Table 1: Permissible levels of ‘auxiliary’ and leakage current, according to IEC 60601-1


5. Functionality and practicality Medical equipment must be practical, durable, and capable of withstanding the rigors of continuous use. The value of modern medical equipment is significantly enhanced by its capacity to gather and analyze data. This often involves using wireless technologies to compile information and enable remote monitoring and diagnostics. Power supplies that provide digital monitoring of their outputs, with advance warning of AC failure and performance degradation, are invaluable. Additionally,


remote control of parameters, such as output voltage or current, could facilitate precise control of the laser diode current in microsurgery or other aesthetic treatments. The XP Power HPF3K0 series power supply fulfills the requirements of both medical and industrial applications. With a 3kW rating, 2 x MoPP isolation, and less than 500µA leakage current, it meets medical EMC specifications and offers advanced digital control and monitoring functions. The series is globally certified for medical use, with high efficiency and a compact size.


Conclusion


Designing medical products, particularly relating to their power supply, involves navigating complex specifications to ensure safety and enhance patient care. Certified power supplies from reputable manufacturers with a global presence provide a solid foundation for new medical equipment designs.


https://www.xppower.com/applications/ medical-power-supplies


www.cieonline.co.uk


Components in Electronics


November 2024 23


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