The Bridge Rectifier
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Figure 4-7.Peak and average values for a full-wave rectifier.
Figure 4-8.Bridge rectifier
Neets Module 07-Introduction to Solid-State Devices and Power Supplies
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4-10
Solution: Since the total secondary voltage (E
_{S}
) is 300 volts, each diode is supplied one-half of this
value, or 150 volts. Because the secondary voltage is an rms value, the peak load voltage is:
E
_{max}
= 1.414
E
_{S}
E
_{max}
= 1.414
150
E
_{max}
= 212 volts
The average load voltage is:
E
_{avg}
= 0.637
E
_{max}
E
_{avg}
= 0.637
212
E
_{avg}
= 135 volts
NOTE
: If you have problems with this equation, review the portion of
NEETS
, module 2, that
pertain to this subject.
As you may recall from your past studies in
electricity
, every circuit has advantages and
disadvantages. The full-wave rectifier is no exception. In studying the full-wave rectifier, you may have
found that by doubling the output frequency, the average voltage has doubled, and the resulting signal is
much easier to filter because of the high ripple
frequency
. The only disadvantage is that the peak voltage
in the full-wave rectifier is only half the peak voltage in the half-wave rectifier. This is because the
secondary of the
power transformer
in the full-wave rectifier is center tapped; therefore, only half the
source voltage goes to each
diode
.
Fortunately, there is a rectifier which produces the same peak voltage as a half-wave rectifier and the
same ripple frequency as a full-wave rectifier. This circuit, known as the
BRIDGE RECTIFIER
, will be
the subject of our next discussion.
Q8. What was the major factor that led to the development of the full-wave rectifier?
Q9. What is the ripple
frequency
of a full-wave rectifier with an input frequency of 60 Hz?
Q10. What is the average voltage (E
_{avg}
) Output of a full-wave rectifier with an output of 100 volts peak?
The Bridge Rectifier
When four diodes are connected as shown in figure 4-8, the circuit is called a
BRIDGE RECTIFIER
.
The input to the circuit is applied to the diagonally opposite corners of the network, and the output is
taken from the remaining two corners.
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