Previous installments of this column have all dealt with situations in which the die temperature was assumed to be at a constant temperature after the system had achieved the steady state. However, there are many times in which it is useful to know how rapidly the temperature of the chip changes when the applied power changes abruptly. This month's column presents a simple … [Read more...]
Thermal joint conductance for graphite materials
The heat flow across a metal/interstitial elastic-layer/metal joint is a very important problem in many microelectronic applications. It is generally known that when two surfaces are brought together, intimate solid-to-solid contact occurs only at discrete parts of the interface. Therefore, the actual contact area of pressed surfaces represents a very small fraction of the … [Read more...]
Flash Diffusivity Method: A Survey of Capabilities
The development, specification, and quality control of materials used in electronics packaging and thermal management often require the measurement of thermophysical properties.This data can be critical to a successful design, especially with the rapidly increasing cooling requirements that result from the packaging of higher performance devices. A variety of methods, involving … [Read more...]
The Thermal Conductivity of Thermal Insulators
This issue, we present an overview of a number of materials that are often used as thermal insulators. The world would have been much easier for thermal engineers if only the creator had provided us with a choice of materials showing the same range in thermal conductivity values as exists for electrical conductivity. Alas, this isn't the case. Thus, not a single one of the … [Read more...]
Thermal Design Challenges in Automotive Alternator Power Electronics
Ever since the advent of the automotive alternator, or claw-pole alternating current generator, in the 1960's, there has been an ever-increasing thermal design challenge to cool the power electronics in these machines. Figure 1 depicts a typical cutaway section of a modern day alternator. At first glance one may think that cooling the diodes in a rectifier bridge of an … [Read more...]
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