1 / 10

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.

ewan
Download Presentation

Front-end thermal design methods

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related