2. Rectifiers. The purpose of most power supply units is to convert
some AC input to the desired DC output(s) in order to operate the
In figure 1-41 you can see that this conversion
takes place in the element labeled as the rectifier.
may be half-wave or full-wave.
Figure 1-41A illustrates the
schematic for a simple half-wave rectifier and its resultant
Figure 1-41B shows a full-wave rectifier diagram and
The component common to almost all types of rectifiers is the diode.
The diode may be a vacuum tube diode or a solid-state diode. Since a
diode has the property of passing current in only one direction, it
is ideally suited for converting AC to DC.
rectification, only one direction of current flow is used. In full-
wave rectification, the diodes are so connected as to make use of the
AC current in both directions, thus resulting in the waveforms shown
in figure 1-41.
Solid-state diodes are used in almost all modern