三端双向晶闸管的功耗计算和T_jmax预测

Triacs:How to calculate Power and Predict T_jmax

三端双向晶闸管用于控制AC电源负载。在大多数应用中,三端双向晶闸管会消耗大量电能,因而需要考虑散热。同时必须计算散热器的大小并预测最高结点温度Tjmax。散热设计和分析是设计和开发过程的基本部分。散热设计需要几个计算阶段,涉及到功率、热阻和温度升高。本文介绍的便是这些计算。

Triacs are used to control AC mains loads. In the majority of applications, the triac will dissipate sufficient power to make thermal considerations necessary. The size of heatsink must be calculated and the maximum junction temperature must be predicted. Thermal design and analysis form an essential part of the design and development process. The thermal design requires several stages of calculation involving power, thermal resistance and temperature rise. This article introduces those calculations.