开关电源的热设计

Thermal Design of Switching-Mode Power Supply

温度是影响开关电源电路可靠性的重要因素之一,因而热设计是开关电源电路设计的重要环节。阐述了电路热设计的相关概念,分析了开关电源电路中主要发热元器件的发热机理,给出了开关电源热设计的一般流程;并根据实际电源电路,介绍了如何采用Ansoft软件对开关电源电路进行热仿真。

Temperature is one of the key factors that necessary to perform thermal design for switching-mode affect the reliability of electronic circuits. Therefore, it is power supply （SMPS）. The basic concept and target of thermal design were described, along with major steps for thermal design of SMPS. Mechanism of heat-generation for main components in SMPS was analyzed. A general guideline for thermal design of SMPS was provided. Finally, thermal simulation of an actual SMPS circuit using Ansoft＇s EDA tool was presented.