Diploma Engineering
Computer Engineering
Enrollment no. 92400938004
EXPERIMENT NO. 6
AIM: To prepare full wave Bridge rectifier and observe the output.
Theory:
Full wave Bridge Rectifier :
In this type of rectifier circuit, it is not necessary to have centre taping in the
secondary winding of the transformer but four diodes are required. Figure shows the
circuit and the waveforms. As the circuit resembles to the Wheatstone bridge, this
rectifier circuit is called the bridge rectifier. T is a transformer. Cathodes of diodes D1
and D2 are joined together which becomes the positive of the d. c. supply. Anodes of
diodes D3 and D4 are joined together which becomes the negative of the d. c. supply.
Anode of diode D1 and cathode of diode D4 are joined together to which one lead of
the secondary winding of the transformer is connected. Similarly, anode of diode D2
and cathode of diode D3 are joined together to which another lead of transformer
secondary is connected. During the positive half cycle when terminal a becomes
positive with respect to terminal b, diodes D1 and D3 are forward biased and conduct
the current. Diodes D2 and D4 do not conduct as they are reverse biased. Current
flows in the direction a D1 X Y D3 b a. During the negative half cycle when terminal b
becomes positive with respect to terminal a, diodes D2 and D4 become forward
biased and diodes D1 and D3 become reverse biased so diodes D2 and D4 conduct
the current and diodes D1 and D3 cannot conduct the current. Current flows in the
direction b D2 X Y D4 a b. Thus four diodes are required and it is not necessary to
have centre taping in the secondary winding of the transformer. During the positive
half cycle when terminal a becomes positive with respect to terminal b, diodes D1
and D3 are forward biased and conduct the current. Diodes D2 and D4 do not conduct
as they are reverse biased. Current flows in the direction a D1 X Y D3 b a. During the
negative half cycle when terminal b becomes positive with respect to terminal a,
diodes D2 and D4 become forward biased and diodes D1 and D3 become
Diploma Engineering
Computer Engineering
reverse biased so diodes D2 and D4 conduct the current and diodes D1 and D3 cannot
conduct the current.
Current flows in the direction b D2 X Y D4 a b.
Thus four diodes are required and it is not necessary to have centre taping in the
secondary winding of the transformer.
Fig: Full wave Rectifier
Task
Circuit diagram of Full wave rectifier
Diploma Engineering
Computer Engineering
Full wave bridge Rectifier
Wave form of Bridge rectifier
Diploma Engineering
Computer Engineering
CONCLUSION: By changing the values so the diagram changes how the wave
move or how they flow.
DATE OF COMPLITION:
SIGNATURE OF FACULTY:
GRADE:
