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5 Things to Know about Conduction Cooling (CCA)

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Wherever electrical power is generated, there is also power dissipation, which heats up the components. This heat needs to be transferred away to prevent overheating. For semiconductors there is a maximum junction temperature, above which the semiconductor ceases to work. The right method to dissipate excess heat heavily depends on the mechanical and environmental conditions, as well as the field of application.
Conduction Cooling is a way of transporting the heat without needing fans, and also providing a metal frame makes the solution even more rugged!

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5 Things to Know about Conduction Cooling (CCA)

  1. 1. Textmasterformat bearbeiten ▪ Second Level ▪ Third Level ▪ Fourth Level Fifth Level June 27, 2018 5 Things to Know about Conduction Cooling (CCA)
  2. 2. 2 Power Dissipation for Harsh Environments Wherever electrical power is generated, there is also power dissipation, which heats up the components. This heat needs to be transferred away to prevent overheating. For semiconductors there is a maximum junction temperature, above which the semiconductor ceases to work. The right method to dissipate excess heat heavily depends on the mechanical and environmental conditions, as well as the field of application. Conduction Cooling is a way of transporting the heat without needing fans, and also providing a metal frame makes the solution even more rugged! 1: What is the difference between conduction and convection cooling? 2: Which are the advantages of convection vs. conduction cooling? 3: Are there conduction cooled COTS components available? 4: Are there any other arguments for conduction cooling beside having no fans? 5: Which temperature range can be achieved with conduction cooling?
  3. 3. What is the Difference between Conduction and Convection Cooling? ▪ Convection cooling is the easiest method to cool board assemblies. It is done by guiding an air flow along the surface to be cooled. Forced air convection cooling uses fans to blow and direct air towards the electronic components with or without heat sinks ▪ Conduction cooling optimizes the thermal contact to conduct the heat from the source to the outer wall of the enclosure. This makes the enclosure itself a heat radiator
  4. 4. Which are the Advantages of Convection vs. Conduction Cooling? Forced air convection cooling: ▪ is the most effective cooling method and can be realized cheap and easy. While the mechanical set-up is simple, some factors may turn out to be serious drawbacks, depending on the application. With flowing air, impurities and liquids can find their way into the device, and can do damage. Complex filtering equipment can reduce this risk, but then maintenance is necessary during the device's lifecycle. Cooling fans also have a limited lifetime, and their failure may lead to a total loss of some electronic components. Conduction-cooled designs: ▪ provide greater flexibility than convection, particularly for extreme conditions. However, conduction cooling requires careful implementation. Suitable measures must be taken to maximize the thermal transfer between the electronic component being cooled and the enclosure wall. On the one hand, this is ensured by choosing the right materials. On the other hand, the boards inside the enclosure need to be placed in the right way, and the heat-conducting cooling blocks need to have such masses that optimum heat transport is guaranteed.
  5. 5. lhhAre there Conduction Cooled COTS Components Available? Yes, of course. The IEEE 1101.2-1992 standards describes the specifications for Eurocard-based circuit card assemblies – so all VMEbus and CompactPCI cards. For all cPCI and cPCI Serial cards, MEN also offers conduction cooling frames up to a complete conduction cooled COTS system. There are also some VITA standards for PMC boards and other plug-in modules defined. In addition to that, MEN is driving a new standard combining PICMG and VITA technologies for robust COM modules: Rugged COM Express (RCE) or VITA 59. This standard defines a slightly adopted PCB board to realize a massive conduction cooling frame.
  6. 6. Are there Any Other Arguments for Conduction Cooling Beside Having no Fans? To make a computer really rugged it needs a robust housing to withstand extreme climatic conditions. With the massive metal block which is needed for conduction cooling also other advantages come along to protect the electronics inside. This includes protection from dust, chemicals or humidity within a sealed enclosure and resistance against high shock and vibration effects by having the metal block firmly screwed to the carrier card or system enclosure. Rugged COM Express modules are even 100% EMC-proven thanks to the aluminum cover on top and all four sides, as well as the bottom cover of the carrier board.
  7. 7. Which Temperature Range can be Achieved with Conduction Cooling? Depending on the power dissipation and used components, the typical temperature range of MEN products with conduction cooling is -40 to +85°C. This is perfectly suited also for railway applications, which require temperature ranges from -40 to +70°C for the device and for 10 minutes up to +85°C according to EN 50155. With the robust COM module family Rugged COM Express, an additional 5°C can be dissipated on average, depending on the processor. At MEN, all products can be tested and qualified in our in-house test laboratory to work in the extended temperature range. ➢ Get a competencies overview on our website ➢ Video: COM Express and a RCE module have a chat
  8. 8. www.men.de/competencies/rugged-computing/ www.menmicro.com/competencies/rugged-computing/ www.men-france.fr/competencies/rugged-computing/

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