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Diode Rectifiers
Introduction
A rectifier diode gives electrical current stream access one and only bearing and is essentially
utilized for power supply operation. Rectifier diodes can deal with higher current stream than
standard diodes and are for the most part utilized as a part of request to change AC current into
direct current. They are outlined as discrete parts or as incorporated circuits and are typically
created from silicon and described by a genuinely expansive P-N-intersection surface. These
outcomes in high capacitance under turn around predisposition conditions. In high-voltage
supplies, two rectifier diodes or more might be associated in arrangement keeping in mind the
end goal to expand the peak inverse voltage (PIV) rating of the blend. Consider the figure
beneath.
A Full Wave Rectifier is a circuit, which changes an AC voltage into a throbbing dc voltage
utilizing both half cycles of the connected voltage. It utilizes two diodes of which one behaviors
amid one half cycle while alternate behaviors amid the other half cycle of the connected air
conditioning voltage. Amid the positive half cycle of the source voltage, diode D1 gets to be
forward biased and D2 gets to be reverse biased. Henceforth D1 behaviors and D2 stays OFF.
The heap current moves through D1 and the voltage drop crosswise over RL will be equivalent
to the information voltage. Amid the negative half cycle of the info voltage, diode D1 gets to be
invert one-sided and D2 gets to be forward one-sided. Thus D1 stays OFF and D2 conducts. The
heap current moves through D2 and the voltage drop crosswise over RL will be equivalent to the
info voltage. Some of the important parameters of rectifiers are shown below.
Ripple Factor
The ripple factor for a Full Wave Rectifier is given by
The average voltage or the dc voltage available across the load resistance is
RMS value of the voltage at the load resistance is
Efficiency
Efficiency, h is the ratio of dc output power to ac input power
The maximum efficiency of a Full Wave Rectifier is 81.2%.
Transformer Utilization Factor
Transformer Utilization Factor, TUF can be used to determine the rating of a transformer
secondary. It is determined by considering
the primary and the secondary winding separately and it gives a value of 0.693.
Form Factor
Form factor is defined as the ratio of the rms value of the output voltage to the average value
of the output voltage.
Peak Factor
Peak factor is defined as the ratio of the peak value of the output voltage to the rms value of
the output voltage.
Peak inverse voltage for Full Wave Rectifier is 2Vm because the entire secondary voltage
appears across the non-conducting diode.
This concludes the explanation of the various factors associated with Full Wave Rectifier.
Calculations and Analysis
Question 23
a. The circuit is a center tapped full wave rectifier
b. Calculating the total peak voltage, we have;
c. Calculating the peak voltage on the ½ of the secondary part we have;
d. Plotting the voltage waveform
e. Peak voltage across each diode
f. PIV of each diode
Question 28
Question 30
Question 33
Question 34
Simulation
Question 23
Graphical output
Question 28
Graphical output
Output across capacitor
Conclusion
In conclusion, a rectifier circuit utilizes the unidirectional property of diodes to change the
voltage from Ac to Dc. The circuit allows current only in the forward biased direction and thus
the effects as shown above. The capacitors at the output are used to reduce the rippling of the
rectified wave as shown in the Multism simulation. It is thus clear that the experiment was a
success since the objectives were made.