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Full-wave rectifier (Bridge type)
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EXPERIMENT NO: 4
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FULL-WAVE RECTIFIER
.
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Pr
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(BRIDGE TYPE).
Mr. Prathamesh Bhosale.
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Page 1
Full-wave rectifier (Bridge type)
TITLE:- Full-wave rectifier (Bridge type).
AIM:- To study & Analyze operation of Full-wave rectifier (Bridge type).
APPERATUS:-
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1. Experimental Board, Full-wave rectifier circuit components, CRO/DSO,
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Electronic Multimeter, etc.
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OBJECTIVES:-
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1. Trace the circuit of a full-wave rectifier;
2. Draw the wave shape of the electrical signal at the input and the output
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3. Measure the following voltages;
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points ( after observing it in CRO) of the full-wave rectifier;
(a) AC voltage at the input points;
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(b) AC voltage at the output points;
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(c) DC voltage at the output points;
4. Verify the formula
=
Pr
at
2V
π
5. Verify that the ripple factor for a full-wave rectifier is 0.482.
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CIRCUIT DIAGRAM:-
NOTE : STUDENT SHOULD HAVE TO DRAW NEAT CIRCUIT DIAGRAM.
Mr. Prathamesh Bhosale.
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Full-wave rectifier (Bridge type)
THEORY:In a full-wave rectifier ( Bridge Type) there are four diodes, a transformer
and a load resistor. When the input voltage is positive at point A diode D2 & D4
conduct. The current passes through the load resistor
. During the other half of
the input signal, the point A is negative with respect to the point B. The diode D1
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& D3 conduct. The current passes through the load resistor in the same direction as
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during the positive half cycle. DC voltage is developed across the load. It can be
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proved that the output dc voltage is given by,
2
is the peak ac voltage at the input of the rectifier. Also we can
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show that the Ripple Factor = 0.482.
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Where
Bh
=
m
PROCEDURE:-
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1. Trace the circuit. Note down the value of the load resistor.
2. Energize the rectifier with the ac mains, Connect the output of the rectifier to
at
the CRO, Adjust different knobs of CRO till you get a stable pattern on the
Pr
screen. Similarly observe the voltage waveshape at the input of the rectifier.
Compare the two waveshapes.
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3. Now, measure the ac voltage at the secondary of the transformer. Also
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measure ac and dc voltage at the output points.
4. Using the theoretical formula,
2
=
Calculate the dc voltage at the output. Compare this value with the measured
dc voltage.
Mr. Prathamesh Bhosale.
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Full-wave rectifier (Bridge type)
5. Use the measured values of ac and dc voltage at the output points to
calculate the ripple factor. Compare this value with the theoretical value,
which is 0.482.
OBSERVATIONS:-
2. Information from the data book :
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a) Maximum forward current rating = ____________ mA
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1. Type number of the diode = _______________
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h
Bh
3. Wave shape at the input and output points ;
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b) Maximum Peak Inverse Voltage rating = ____________V
Pr
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ha
m
NOTE : STUDENT SHOULD DRAW NEAT INPUT WAVESHAPE.
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NOTE : STUDENT SHOULD DRAW NEAT OUTPUT WAVESHAPE.
4. Measurements of voltages;
a) AC voltage at the input points (across the secondary winding terminals) =
________________ V
Mr. Prathamesh Bhosale.
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Full-wave rectifier (Bridge type)
b) AC voltage at the output points = ________________ V
c) DC voltage at the output points = ________________ V
5. Verification of the formula :
a) Output dc voltage
Theoretical value
=
0.482
=
Bh
2) Ripple Factor
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1) Output dc voltage
Practical value
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Quantity
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RESULTS:-
1. The wave shapes at input and output on the CRO observed and they are
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plotted.
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2. The output dc voltage is a little less than the theoretical value.
3. There is a little difference between the theoretical value and measured value
Pr
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of ripple factor.
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SAMPLE VIVA QUESTIONS:1) Why the output dc voltage is little less than the theoretical value ?
2) Explain effective utilization of full wave rectifier in real life ?
3) What are the drawbacks of full wave bridge rectifier ?
Mr. Prathamesh Bhosale.
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Page 5