Transistor And Inductive-Switch Analogs
by Dennis L. Feucht
Innovatia Laboratories
The transistor and the inductive switch, the core circuit of power converters, have interesting analogs. Both have three terminals (hence three configurations), are active devices, and have a key parameter. For bipolar junction transistors (BJTs) it is a; for the switch cell, it is duty-ratio, D. While a is fixed for BJTs, it can be varied for inductive switches, which leads to time-variant circuit behavior in switching converters. In this article, the two kinds of active devices are compared.
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