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As electronic devices have become larger and faster, circuits
have evolved and ac motor control has become more popular than dc motor
control for industrial applications. Today dc-to-dc voltage conversion
is more widely used in power supply circuits because every piece of equipment
that has an electronic board in it requires a wide variety of dc voltage
supplies. Each voltage must be supplied from a power supply. This means
that computers, PLCs, and all other electronic equipment require a dc
power supply. Today the older chopper circuits have been modified into
the new power-supply technology with newer types of circuits and they
are all more commonly called converters. Most often one will find converter
circuits today in switch-mode power supplies (SMPS).
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