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Power/Alternative Energy  

Get beyond ON/OFF fan control

Posted: 10 Sep 2008     Print Version  Bookmark and Share

Keywords:fan control  ON/OFF control  temperature sensors  thermal management 

A simple fan control approach is to simply turn the fan ON when the temperature exceeds a set-point, however, the acoustic penalty for this method is severe. ON/OFF control sufficed for early product generations, but consumers are now demanding that products are both capable and quiet. There are several speed fan control circuits that can be implemented using digital temperature sensors with two temperature programmable interrupt outputs. Digital temperature sensors provide high accuracy and ease-of-use at a very low cost and can support three speed fan controls with just a few additional components.

LCD, plasma and projection TVs, set-top boxes and projectors are examples of products with high heat-generating components that require active cooling. Consumers expect new products to outperform their predecessors and quiet operation is now a required feature. Products that previously had no fan speed control now must incorporate more sophisticated thermal management at little or no cost increase.

View the PDF document for more information.





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