Medical Electronics
both classes can be used, but the choice depends on the specific requirements of the medical device and the environment in which it will be used. If you intend to use an inline desktop style power supply it needs to be a Class II. Compliance with relevant safety standards such as IEC 60601-1 is essential regardless of the class chosen.
External vs. embedded power supply
Class II power supply:
Double insulation: Class II power supplies have two layers of insulation between the user and the electrically live parts, eliminating the need for a safety ground connection.
No reliance on earth ground: Unlike Class I, they do not rely on an earth ground for protection against electric shock. Plastic enclosure: Class II power supplies
often have a plastic enclosure since they do not require a metal chassis for grounding. Symbol: The symbol for Class II equipment is a square within another square, with one of the squares being dotted.
Choosing between Class I and Class II power supplies depends on factors such as the application and specific safety considerations. In medical environments,
External power supply: Standalone units that connect to the medical device via a cable or connector. They offer flexibility in terms of placement and replacement but may occupy additional space and require separate handling. Offer ease of replacement in case of failure in the future. Embedded power supply: Integrated directly into the medical device’s enclosure or chassis. They offer a more compact and streamlined design but may be more challenging to replace or service.
Distributed power architecture vs. Are multiple voltage rails needed? A typical solution is to use a distributed
power architecture (DPA). DPA offers a decentralised system with a power supply providing a base voltage which is transferred throughout the design with other dc/dc converters and point of load (POL) converters closer to the required loads.
Alternatively, a configurable unit could be used instead to provide the different voltages required. This offers flexibility to meet exact specifications. They are highly efficient and offer a quick route to product design. Along with defined EMC results and flexibility to change modules if the design requirements change.
Conclusion
By carefully considering factors mentioned, you can select a medical power supply that meets the specific requirements of your medical application whilst ensuring safety, reliability, and compliance with regulations. To discuss these topics in more detail our power specialists are ready to assist with product selection and technical support throughout the design cycle, offering a direct link to the factory.
https://www.lusoelectronics.com/
www.cieonline.co.uk
Components in Electronics
May 2024 19
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