View
213
Download
1
Category
Tags:
Preview:
Citation preview
ALPHA BREATHING
Basics of Electrical & Electronics Engineering
UNIT – IV ELECTRONICS ENGINEERING
TOPIC: Half Wave & Full Wave Rectifier
Topics to be Discussed
Half wave rectifier & Full wave rectifier Ripple factor Efficiency Peak inverse voltage Transformer utilization factor Form factor Peak factor
Power Supply
• A group of circuits used to convert ac to dc.– Rectifier – Converts ac to pulsating dc.– Filter – Reduces variations in the rectifier output.– Voltage regulator – Maintains a constant dc output
voltage.
Rectifier
Rectifier is an electronic device used for converting ac voltage into dc voltage.
It utilizes PN junction diode Rectifiers are classified into two types
Half wave rectifierFull wave rectifier
Half Wave Rectifier
The Half wave rectifier is a circuit, which converts an ac voltage to dc voltage during only one half cycle only.
In the Half wave rectifier circuit shown above the transformer serves two purposes. It can be used to obtain the desired level of dc voltage (using step up or step down
transformers). It provides isolation from the power line.
Full Wave Rectifier
The full wave rectifier is a circuit, which converts an ac voltage to dc voltage during both positive and negative half cycles.
TypesCentre tapped full wave rectifierBridge Rectifier
Centre tapped full wave rectifier
0 to π ---- D1 Forward biased
D2 Reverse biased
π to 2π ---- D2 Forward biased
D1 Reverse biased
Full wave Bridge rectifier
0 to π ---- D1, D2 Forward biased
D3, D4 Reverse biased
π to 2π ----D3, D4 Forward biased
D1, D2 Reverse biased
Ripple FactorRipple Factor
12 FFRF
Half Wave Rectifier
Derive Vdc & Idc
Derive Vrms
Half Wave Rectifier
Idc= Vdc/(rs+rf+RL)
Vdc = Vm/∏ - Idc (rs+rf )
Half Wave Rectifier
Full wave rectifier
Derive Vdc & Idc
Derive Vrms
Full wave rectifierRipple FactorRipple Factor
Idc= Vdc/(rs+rf+RL)
Vdc = 2Vm/∏ - Idc (rs+rf )
Half Wave RectifierEfficiency
Half Wave Rectifier
Full wave rectifierEfficiency, Form Factor & Peak Factor
414.12
2
m
m
rms
m
VV
V
VPF
Half Wave RectifierTransformer Utilization FactorTransformer Utilization Factor
Full wave rectifier TUF
TUF
Centre Tapped Full wave rectifier TUF =0.693
Full wave Bridge rectifier TUF =0.812
Peak Inverse Voltage Peak Inverse Voltage
Peak Inverse Voltage(PIV)Peak Inverse Voltage(PIV)
Maximum reverse voltage that a diode can withstand Maximum reverse voltage that a diode can withstand without destroying the junctionwithout destroying the junction
PIV = VPIV = Vm m for Half wave rectifier & Full wave bridge rectifierfor Half wave rectifier & Full wave bridge rectifier
PIV = 2VPIV = 2Vmm for centre tapped full wave rectifier for centre tapped full wave rectifier
ComparisonComparison
PUZZLE
• The ages of a father and son add up to 66. The
father's age is the son's age reversed. How old
could they be?
• ANS:
Father 51, son 15Father 42, son 24Father 60, son 06
PUZZLE
• Ram sat with his friends in the Chinnaswamy stadium in Bangalore to watch the 100 metres running race organized by the Asian athletics Association. Five rounds were run. After every round half the teams were eliminated. Finally, one team wins the game. How many teams participated in the race?
• ANS:32
• A grand father has 3 grand children. Age difference of two children among them is 3. Eldest child age is 3 times the youngest child’s age and the eldest child age is two year more than the sum of age of other two children. What is the age of the eldest child?
• ANS:15
READING
DRAW MINDMAP
SUMMARY
Moulting
(Drawing mind map on the board)
Mind Map
33
Half-wave rectifierFull-wave
Bridge rectifier
Ripple Factor 0.48
Rectifiers
PIV Vm
Peak Factor 2
TUF 0.287
Form Factor 1.57
PIV 2Vm
Centre Tapped Full-wave rectifier
PIV Vm
Ripple Factor 0.48
Ripple Factor 1.21
Peak Factor 1.414
Peak Factor 1.414
Form Factor 1.11
Form Factor 1.11
TUF 0.812
TUF 0.693
Moulting
(presentation within the group)
Recommended