
2
POWER ELECTRONIC
CONVERTERS
FOR
MOTOR DRIVES
INTRODUCTION
In this chapter we will look at examples of the power con-
verter circuits which are used with motor drives, providing
either d.c. or a.c. outputs, and working from either a d.c.
(battery) supply, or from the conventional a.c. mains. The
treatment is not intended to be exhaustive, but should serve
to highlight the most important aspects which are common
to all types of drive converter.
Although there are many different types of converter, all
except very low power ones are based on some form of
electronic switching. The need to adopt a switching strategy
is emphasized in the first example ...