High Performance Heat Sinks for Power Electronics

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What are heat sinks and what are they used for?

In power electronics, heat losses occur which have to be dissipated in order to protect the electronics from becoming derated or damaged. To achieve this, heat sinks made from solid or hollow aluminium are used, onto which the electronic components are mounted.

DAU Thermal Engineers are one of the manufacturers cooling solution for such applications. Its target groups are electronics and mechanical development engineers. The main goal is to engineer suitable solutions for challenging thermal applications.

Maintaining operating temperature

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For the case of air cooling, the heat is removed with or without a fan by the means of extended surfaces called fins. For the case of liquid cooling, heat is removed using a specifically engineered internal cooling circuit. Heat pipes can be used to upgrade an air-cooled design towards the performance of liquid cooling.Reliability and service life of every electronic circuit depends on the operating temperature, which highlights the importance of adequate cooling.

Liquid cooled cold plates

For the ultimate in thermal heat sink performance, Dau provides a full line of liquid cooled heatsink and cold plate design applications to fit your high power needs. With today’s power devices becoming smaller and more powerful, liquid cooling is coming to the forefront as the best thermal solution. Packaging can be compact, noise is kept to a whisper, and semiconductors can look forward to a longer life due to lower operating temperatures.

Bonded fin heatsink

Dau Thermal Solutions claims to offer customers total freedom in the design and manufacturing of our Bonded Fin Heatsinks. Each bonded heat sink is built to the specific needs of customer. We do not believe in the one-size-fits-all theory, in power electronics very few applications are ever the same.

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Bonded Heatsinks can dissipate two – three times more heat than the average extruded heatsink by adding 200% to 300% to the cooling surface area. Two fin styles are available – folded fin and single fin. Fin height, fin thickness and fin density can be used in countless combinations to get the performance you, the customer, deserves.

Heatpipes for super thermal conductivity

So what is a Heatpipe?
In simple terms, a heatpipe is a super heat conductor, the device can exhibit a thermal conductivity that is in excess of 300 times better than that of an equivalently sized component made from pure copper. Typically, they take the form of a rod of circular cross section with a diameter ranging from 5/16 to 2.00 inches, and lengths which may be from only a few inches, to several yards. Other sections include rectangular, flattened and also annular with an open centric bore.

How does a Heatpipe work?
A heat pipe consists of a sealed evacuated metal envelope containing a porous capillary action wick lining and is charged with a working fluid. The preferred working fluid is usually high purity water or alcohol which exists as a saturated vapor within the vessel. When heat is applied to any point along the external surface of the heat pipe, the fluid inside the heat pipe evaporates at that point and then condenses again at any other points at fractionally lower temperatures. The working fluid is returned to the evaporator area by capillary action developed in the capillary wick lining and or by gravity. In so doing, the latent heat capacity of the working fluid is utilized to effect a very efficient energy transfer, with only a very minimal internal thermal resistance.

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