RF Amplifier Thermal Analysis with Ansys Icepak: Part 1
Welcome to this tutorial on using Ansys Icepak for thermal analysis of a radio frequency amplifier. In this video, we will guide you through a step-by-step demonstration of setting up and analyzing the thermal performance of an RF amplifier.
Overview
The model of interest is a radio frequency amplifier enclosed within a cabinet. The cooling system involves a fan that blows cold air through heat sinks, conducting heat away from the RF amplifier. This video is divided into several parts, each focusing on different stages of the process.
Steps Covered in This Part
- Opening Ansys Icepak and creating a new project.
- Defining the enclosure and resizing it.
- Assigning boundary conditions.
- Creating and positioning the enclosure.
- Adding and aligning walls.
- Defining the printed circuit board (PCB) and its properties.
- Adding heat sources to the PCB.
- Creating a heat sink and defining its properties.
- Adding a fan from the Icepak library.
Detailed Steps
1. Opening Ansys Icepak
Start by opening Ansys Icepak. Create a new project named RF Amp. The enclosure is automatically defined by Icepak, which you can resize by adjusting the cabinet properties.
2. Defining the Enclosure
Double-click on the enclosure to access its properties. Under the geometry tab, define the enclosure shape as a prism and update the dimensions to create a rectangular enclosure.
3. Assigning Boundary Conditions
Define an opening in the max Y direction. Update the enclosure properties to reflect these changes.
4. Creating and Positioning the Enclosure
Add an enclosure using the Create Enclosures object. Adjust its position by entering the required coordinates.
5. Adding and Aligning Walls
Add a wall and name it Xmin. Define its geometry as a rectangular wall in the YZ direction. Use the Morph Edge option to align the wall with existing edges.
6. Defining the Printed Circuit Board (PCB)
Select Printed Circuit Boards and define the PCB geometry as rectangular in the YZ plane. Adjust the properties to define trace layers and their respective thicknesses and copper percentages.
7. Adding Heat Sources to the PCB
Add 12 heat sources on the PCB. Define the first source and use the copy function to replicate it across the PCB.
8. Creating a Heat Sink
Add a heat sink and define its geometry and properties. Set the flow direction, fin type, and other relevant parameters.
9. Adding a Fan from the Icepak Library
Use the Icepak library to add a fan. Search for a fan that meets your specifications and place it correctly within the model.
Conclusion
This concludes the first part of our tutorial, where we have set up the basic components of our RF amplifier model. In the next part, we will proceed with meshing, execution, and post-processing.
Hello. Today we'll be going through a tutorial using ANSYS Icepak. The model of interest is a radio frequency amplifier. As you can see on the screen, we have our heat generating component within this enclosure.
The cooling system is via this fan, which blows cold air through the heat sinks that conduct heat away from our RF amplifier. We will go into great detail, covering each step of the process.
We'll generate our geometry from scratch using Icepak primitives, set up boundaries and operating conditions, create a mesh, execute the model, and perform post-processing. This video will be in several parts, each focusing on different aspects of the process. First, open ANSYS Icepak.
You'll be greeted with a smaller window. Here, we'll start a new project. I'll name it "RF amp" and hit create. Now, we have the enclosure automatically defined by Icepak.
We can resize this enclosure, or in Icepak terms, the cabinet, by double-clicking on it and adjusting the numbers under geometry. Next, we'll assign some boundary conditions. We want to define an opening in the max y direction. Let's call this an opening and hit update.
Now, add an enclosure using the "create enclosures" object. We'll define boundaries for our enclosure. Double-click on it, go to properties, and make the min x and max x open. Name this component "housing" and hit update. Now, let's use Icepak's edge alignment functionality.
Add a wall, name it "Xmin," and make it a rectangular wall in the yz direction. Use the morph edge option to latch it onto the existing edge. For the wall, define a wall tag and a wall thickness of 1 millimeter.
Select a solid material from the rich material library, such as plastics > plastics > rigid R 12. Next, define thermal boundary conditions for our Xmin wall. Select a heat transfer coefficient value, set it to 5 watts Kelvin meter square, and hit update. Now, let's define our PCB.
Select printed circuit boards, double-click on it, and define the PCB as a rectangular shape in the YZ plane. Set the thickness and copper percentage as needed. For heat sources, create a source, name it "device," make it rectangular, and set the power to 7 watts.
Repeat this process for the remaining devices, or use the copy option for faster replication. Finally, create a heat sink by selecting the object and defining its geometry, base height, flow direction, fin type, and fin thickness.
In the next part, we'll add a fan from the Icepak library and position it correctly within our model.
