The CUS250 power supply series
offers the right solution for every cooling concept
TDK-Lambda’s new CUS250 series AC-DC power supplies provide 250 W of output power despite a small footprint of
50.8 x 101.6 mm (2 x 4 inch) and are certified to both IEC 60601- 1 and IEC 62368-1 for Class I and Class II
(double insulated) installations. Different unit versions and cooling concepts allow flexible integration into
target applications from the industrial, laboratory and medical sectors. In this article, you will learn what
needs to be considered with regard to cooling for power supply units.
Power
Before starting the development of a mechanical enclosure for a new electronic or electrical system, there are a
number of important steps that should be taken. The mechanical dimensions will have probably been set by the
project or programme manager with market feedback from the Sales and Marketing team members. In the Engineering
feasibility study stage, 3D modelling is frequently used to determine if all the required parts and assemblies
will actually fit.
Power supply series for different environments
How the system will be cooled will normally be stated. A medical device in close proximately to the patient will
most likely demand that audible noise is minimised. This will restrict or exclude the use of fan cooling. Even
in an office or light industrial environment, there could be restrictions placed on the amount of cooling vents
allowed, their size and location. Dust and other contaminants present in particularly dirty locations may
contain materials that are conductive, conductive when wet or potentially flammable.
Getting to grips with different installation situations
Equipment that is destined for rack mounting, like test, telecom or datacom equipment, will most certainly have
an airflow direction stated. If accessible by an operator or technician, cool air will be drawn in from the
front, rather than the rear of the rack assembly. This avoids the user being continually subjected to heated
air, which can be irritating and potentially lead to eye irritation issues.
Once the locations of the major parts and assemblies are decided upon, computerised thermal modelling should be
performed. This will determine whether there are any areas where heat generating items are causing problematic
temperature rises on components that are sensitive to heat, which could affect performance of the system.
Video: Introducing CUS250M silent 250 watts medical power supply
