Power supplies are used
everywhere appliances are powered at voltages higher or lower than line
voltage.
Most power supplies change voltages and
rectify AC into DC for use on electronic circuits.
Welders battery chargers are also power supplies
that supply power at range that exceed our familiar appliances such as
audio gear and computers.
Battery chargers that keep a charge on emergency
lighting systems and electric fork lifts etc. are power
supplies.
Power supplies combine our understanding of the components studied
earlier.
POWER SUPPLIES
AC is
rectified into Pulsating full wave DC
> this type of output would be suitable for for a battery charger
but not for much because of the waveform
A single diode will produce half wave
pulsating DC which
is inefficient because half of the wave is not captured
a 4 diode bridge
configuration creates an efficient fullwave pulsating DC output which is efficient since the full wave is captured
PDC
electrical energy is stored and released by the
capacitor during each pulse in a way that smoothes out the peaks
....... more capacitance will create a smoother output with no
ripple