Figure 4: The differential
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Figure 4: The differential structure function: 1W red light mounted on MCPCB for LED (Click image to view full size)
Since the thermal conductivity of copper and plastic is not the same, the structural function of the curve can easily read thJC R value. Meanwhile, in the second sheet material was added under test curves make separation occurs by separating point can easily distinguish the junction - the thermal resistance between the plates. If you need to create an LED package transient thermal LED Strip model, you need to use an appropriate thermal resistance characteristic curve instead of a fixed thJC R thermal resistance to describe the knot - shell heat flow path of heat dissipation characteristics. Derived from the thermal transient test structure function can help to achieve transient thermal model. Integral form of the structure function that is a complete thermal heat capacity of the network diagram, these thermal heat capacities accurate description settle - environmental heat flow path heat dissipation characteristics. The integral structure function GU10 ladder approximation can be obtained by different physical structure of heat flow path commuted value of thermal resistance and heat capacity. (In [8] mentioned in the NID based model generation method according to the time constant on the discretization.)
