Thermal Management: The Basics

Chances are you have several mechanisms of electronics thermal management working for you as you read this. If you have a cooling fan attached to your laptop, or a DVR set to record your favorite shows while you are at work, you have electronics thermal management working right now. Electronics thermal management is the process that prevents overheating in electronics, allowing them to do all of the things they are supposed to do as efficiently as possible. If you’ve ever had a notebook on your lap while watching a movie on Netflix, then you know just how hot those devices can get. Careful thermal management keeps your devices cool so that they can work properly. Poor thermal management of your electronic devices will reduce their life span and jeopardize the information you may have stored on them. The last time your computer crashed when playing Farmville is an example of an overheated device whose thermal management system buckled under the pressure of your game playing.
Electronics thermal management systems are designed to ensure that the junction temperature on the device in question stays below a certain limit. If it gets too hot, the device will crash, and you may even see damage to the device. All power components on your electronics have a set temperature, also known as the maximum junction temperature, and so the temperature of the junction must stay beneath this set temperature. Every device comes with its own thermal resistance capacity, and there are many factors that go into the consideration of how to construct the thermal management system that will work on a specific device.
In order to ensure that the device will operate within these set limits, the heat dissipation for that specific device, the heat sink for that device, and the maximum power dissipated by that device must all be analyzed in order to maximize the most efficient thermal management system.
Powered electronics designers make chips that are densely bundled with circuits to make this happen. Some parts of the chips include sections that will operate at greater frequencies than others. These spots are called “junctions” and are known as the hottest places on the chip. In order to keep your electronics cool, keeping those junctions cool is your challenge. Thus, if you are looking for thermal management solutions for overheating electronics, the first step is determining the proper junction temperature.