1. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Power Supply Design
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

2. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Learning Objective: To understand about the concept and various type of Rectifiers
Learning Outcome: Explain the types of rectifiers and applications
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

3. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
What is Power supply?
Need for Power supply
Elements of Power supply
Filters
Voltage Regulators
A basic Power supply
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

4. Why we go for power supply studies?
All electronic circuits need smooth DC power supply in order to function correctly. 
The DC power supplied either from battery or power pack units
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

5. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
What is a power supply
A device, which converts, regulates, and transmits the required power to the circuit to be operated
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

6. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Rectifier is a device which convert AC voltage in to pulsating DC
A rectifier utilizes unidirectional conducting device Ex : P-N junction diodes
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

7. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Types
Depending up on the period of conduction
Half wave rectifier
Full wave rectifier
Depending up on the connection procedure
Bridge rectifier
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

8. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Half wave Rectifier
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

9. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Activity
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

10. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

11. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Bridge Rectifier
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

12. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Filter Circuits
The output from the rectifier section is a pulsating DC.
The filter circuit reduces the peak-to-peak pulses to a small ripple voltage.
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

13. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
Ripple Factor
After the filter circuit a small amount of AC is still remaining. The amount of ripple voltage can be rated in terms of ripple factor (r).
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE

14. Capacitor Filter Ripple voltage
The larger the capacitor the smaller the ripple voltage.
DC output
Ripple factor

15. Diode Ratings with Capacitor Filter
The size of the capacitor increases the current drawn through the diodes—the larger the capacitance, the greater the amount of current.
Peak Current vs. Capacitance:
where
C = capacitance
V = change in capacitor voltage during charge/discharge
t = the charge/discharge time 15

16. RC Filter Circuit
Adding an RC section further reduces the ripple voltage and decrease the surge current through the diodes.
Vr(rms) = ripple voltage after the RC filter
Vr(rms) = ripple voltage before the RC filter
R = resistor in the added RC filter
XC = reactance of the capacitor in the added RC filter
VNL = no-load voltage
VFL = full-load voltage 16

17. EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE
THANK YOU
1/25/2018
EC-1/ UNIT- 1 RECTIFIERS/ PREMA.S, AP/ECE