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Diode Rectifier Circuits
Section 4.5
In this Lecture, we will:
Determine the operation and
characteristics of diode rectifier
circuits, which is the first stage of
the process of converting an ac
signal into a dc signal in an
electronic power supply.
Full-wave and half-wave diode
rectifier circuits will be discussed.
Block Diagram
for an AC to DC Converter
(Power Supply)
Problem-Solving Technique:
Diode Rectifier Circuits
1. Determine the input voltage condition
such that the diode is conducting (on).
Then find the output signal for this
condition.
2. Determine the input voltage such that
the diode is not conducting (off).
Then find the output signal for this
condition.
Half-Wave Real Diode
Rectifier
vI
Voltage Transfer
Characteristics
Half-Wave Rectifier
vI N1
L1


vS N 2
L2
Voltage Transfer
Characteristics
Signals of Half Wave Rectifier
Input voltage
Output voltage
Diode voltage
Load Line Analysis
Load line
when vS is at
its maximum
forward
voltage.
Load line
when vS is at
its most
negative
value.
Load Line (con’t)
As vS varies with time,
the load line also
changes, which changes
the Q-point (vD and iD)
of the diode.
Full-Wave Rectifier
Voltage transfer characteristics
Input and output waveforms
Full-Wave Bridge Rectifier
When vS is positive,
D1 and D2 are turned
on (a). When vS is
negative, D3 and D4
are turned on (b).
In either case, current flows through R in the same
direction, resulting in an output voltage, vO, shown in (c).
Full-Wave Bridge Rectifier
Half-Wave Rectifier as a
Battery Charger
Battery Charging Example
Battery Charging Example
Battery Charging Example
Another Battery
Charging Example
Another Battery
Charging Example
Another Battery
Charging Example
DC Power Supply Circuit