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Solid State Switches - Design Concepts

September, 2010: Solid State Switches - Design Concepts
 

A common problem that most of the electronics hobbyist & amateurs face with is interface of DC low system (usually, logic devices like microcontrollers) with an external high voltage system (AC/DC) for switching control purposes. Also, students of field other than electronics find it difficult to understand the concept of solid state switching and end up with a mess in the output interface sections of their projects.

The following article-cum-reference document describes the concept of designing solid state DC switches using bipolar transistors in a layman’s language. The flow of article will start from the relevant basics of a transistor and will pass through the selection guidelines, design concept and end in typical applications. The article can be used as a quick reference while designing such interfaces.

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