About Two-Resistor Components

A two-resistor component is a compact thermal model, representing a small electronics package, used to predict the temperature at critical points within the model. When you add a two-resistor component to your model, you can simulate the thermal effects of the electronics package.

To create a two-resistor component, you must first model the geometry of the actual electronics package. You then select a simple block (to use as the support) from the product structure to replace this geometry. Finally, you mesh the simple block and add it to the simulation. Internally, the solver models the two-resistor component using the block-and-plate approach, as shown below.

Case node

Top plate (junction-to-case resistance)

Junction node

Bottom plate (junction-to-board resistance)

Board node

The cylinder represents the junction node, which is where the junction power is specified and is modeled as the heat source in the electronics package. The top and bottom plates represent the junction-to-case resistance and the junction-to-board resistance, respectively. The board side of the junction node must be in contact with a solid, while the case side of the junction node can be either open to fluid or in contact with a different solid. The sides of the package are adiabatic, such that heat transfer occurs only at the junction-to-case and junction-to-board interfaces.

 

See Also
Defining a Two-Resistor Component