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Front-end thermal design methods

www.frigprim.com. 1. Front-end thermal design methods. 2. Why. Safety The risk for mistakes is dramatically reduced. Speed Re-designs delay product introduction. Cost 80% of the costs are fixed in the first 20% of the design process. 3. Front-end tools Provide overviews.

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Front-end thermal design methods

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  1. www.frigprim.com 1 Front-end thermal design methods

  2. 2 Why Safety The risk for mistakes is dramaticallyreduced. Speed Re-designs delay product introduction. Cost 80% of the costs are fixed in the first 20% of the design process.

  3. 3 • Front-end tools • Provide overviews. • Do not require detailed knowledge. • Can cover many alternatives in a short time. • Back-end tools • Provide implementation proposals. • Require detailed knowledge. • Are aimed to make accurate calculations. Front- and back-end tools

  4. Typical output Experience values 4 The cooling efficiency method estimates the maximum heat load that can be put on a PCB. The lay out impact is replaced by an experience value: “The cooling efficiency”. The cooling efficiency method

  5. hc=77%. Calculated by Btemp 5 What is needed An experience value for the cooling efficiency.(The right image on the former slide is a good start for telecom applications) A back end tool that provides experience values.(Btemp is currently the only thermal PCB tool on the market that displays the cooling efficiency) A temperature criterion.(The maximum allowed PCB temperature for the worst room temperature case) A PCB size.(Depth and height) A cooling arrangement.(Single or serially cooled PCBs) A front-end tool that employs the cooling efficiency concept.(For example Bload)

  6. Typical output Experience values 6 The air efficiency method estimates the maximum heat load for PCBs with heat sinks. A good design should have an efficiency in the range 35% - 65%. The air efficiency method

  7. ha=17%Calculated by Btemp 7 What is needed An experience data bank for the air efficiency.(needs to be targeted for each specific application type) A back end tool that provides the air efficiency as an output.(Btemp is currently the only thermal PCB tool on the market that displays the air efficiency as an output) A temperature criterion.(The maximum allowed PCB temperature for the worst room temperature case) A PCB size.(Depth and height) A cooling arrangement.(Single or serially cooled PCBs) A front-end tool that employs the air efficiency concept.(For example Bload)

  8. Layout application Component application 8 The thermal territory method estimates the surface that a component needs for its cooling. Thermal territories makes it easy to create good thermal layouts. The method can also be used as a front-end tool for components. The thermal territory method

  9. 9 What is needed A software tool that supports thermal territories.(Btemp is one of the few software that can do this) A temperature criterion.(The maximum allowed PCB temperature for the worst room temperature case) Thermal properties for the PCB.(Thermal conductivity in the plate direction) A thermal component model.(Simple models are good enough) A cooling arrangement.(Single or serially cooled PCBs)

  10. 10 Conclusions There are several thermal front-end methods. The tools needed are available, low cost and simple to use.

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