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Posted on 06 June 2019

Selecting Power Components

 

 

 

 

 

 

 

When selecting power components for specific applications, certain factors have to be considered. These factors include the component voltage and current ratings under the possible cooling conditions, as well as the permissible operating ranges. These factors have to be looked at in every possible stationary and short-time operating state (overload).

The load must not cause the maximum ratings for reverse voltage, peak current, and junction temperature given in the datasheets to be exceeded, irrespective of the static or dynamic conditions. The same applies to the maximum limits for module case, e.g. vibration and shock resistance, resistance to climatic influences, insulation voltage in modules, and assembly requirements. An exception with regard to the reverse voltage being overshot are avalanche-proof diodes up to the maximum avalanche power losses PRSM; an exception with regard to the junction temperature is the surge current load. To ensure a high degree of reliability and sufficiently long service life, the modules must be able to withstand the intended number of load cycles with notable temperature swings.

Proper dimensioning will not cause devices to be loaded up to the maximum rated junction temperature Tjmax, but will include a safety margin for operating conditions which have not been considered as well as for module aging.

 

For more information, please read:

Selection Guide - Varistors

Transducers - Basic Principles of Selection

Criteria for Successful Selection of Diodes and Thyristors

Criteria for Successful Selection of IGBT and MOSFET Modules

 

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