BRIDGE RECTIFIER
AIM - To study Bridge rectifier.
APPARATUS - Bridge Rectifier circuit, a C.R.O and electronic (or ordinary) multimeter.
OBJECTIVES -
Vdc = 2Vm/π
Verify that the ripple factor for a bridge rectifier is 0.482.
THEORY -
In a bridge rectifier circuit there are four diodes, a transformer and a load resistor. When the input voltage is possible at point A, diodes D2 and D4 conducts. The current passes through the load resistor RL. During the other half of the input signal, the point A is negative with respects to the point ‘B’. The diode D1 and D3 conducts. The current passes through the load resistor in the same direction across the load . It can be proved that the output DC voltage is given by-
Vdc = 2Vm/ π
Where, Vm is the peak AC voltage at the input of rectifier.
Also we can show that
R.F.= 0.482
OBSERVATIONS -
CONCLUSION:-
In bridge wave rectifier four diodes are used to convert A.C voltage in to the D.C voltage.
The practical value of ripple factor is different than the theoretical value.
APPARATUS - Bridge Rectifier circuit, a C.R.O and electronic (or ordinary) multimeter.
OBJECTIVES -
- To trace the given circuit of bridge rectifier.
- Draw the electrical wave shape at the input and output points after observing it on C.R.O.
- Measure the following voltages.
- A.C voltage at the input of rectifier.
- A.C voltage at the output points.
- D.C voltage at the output points.
- To verify the formula.
Vdc = 2Vm/π
Verify that the ripple factor for a bridge rectifier is 0.482.
THEORY -
In a bridge rectifier circuit there are four diodes, a transformer and a load resistor. When the input voltage is possible at point A, diodes D2 and D4 conducts. The current passes through the load resistor RL. During the other half of the input signal, the point A is negative with respects to the point ‘B’. The diode D1 and D3 conducts. The current passes through the load resistor in the same direction across the load . It can be proved that the output DC voltage is given by-
Vdc = 2Vm/ π
Where, Vm is the peak AC voltage at the input of rectifier.
Also we can show that
R.F.= 0.482
OBSERVATIONS -
- Primary voltage A.C = 230v
- A.C voltage at the i/p of rectifier = v
- A.C voltage at the o/p of rectifier = v
- D.C voltage at the o/p of rectifier = v
- Theoretical D.C voltage = Vdc = 2Vm/π
- Theoretical Ripple factor = 0.482
- Observed Ripple Factor = Output Vac/ Output Vdc
CONCLUSION:-
In bridge wave rectifier four diodes are used to convert A.C voltage in to the D.C voltage.
The practical value of ripple factor is different than the theoretical value.