Power Electronics topic Rectification using MOSFETS

1. AC TO DC CONVERSION USING
MOSFETS

2. Table of
Contents
 Introduction
 Rectification
 Types of Rectification
 MOSFET Rectification
 Comparison
 Advantages
 Simulation

3. 1
ACTO DC
CONVERSION
convert alternating current (AC) to
(DC).
Used for almost all appliances.

4. 2
Passive &Active
AC-DC
Conversion
Passive rectification.
Active rectification.

5. 3
Half-wave
Rectifier
 Rectifies only half cycle of the waveform.
 consist a step down transformer, a diode and a load
resistance.

6. 4
FullWave
Bridge Rectifier
Full Wave Bridge Rectifier circuit four
diodes are used.
 Conducts for both positive and negative
half cycles and gives .

7. 5
MOSFET
Rectification
 Four MOSFETs in a bridge configuration ;
 P-type and N-type MOSFETs.
 Act as a switch with a small on-resistance
 Threshold voltage

8. 6
Working of
MOSFET
rectifier
 P-M1 and N-M2 turn on during the positive half-cycle of the input
voltage.
 The current follows the path starting fromVin over P-M1, RLoad,
N-M2, and reaches the starting pointVin again.
 During the negative half-cycle, P-M2 and N-M1 turn ON.

9. 7
MOSFET over
Diodes
High power losses .
Thermal dissipation.
Coast
Small RDON

10. 8
Power loss
comparison
Comparison

11. 9
Get rid of
transformer or
boost circuits
Step-up transformer.
Decrease turns ratio.

12. 10
Heat sink
requirement
Avoid expensive and bulky heat sinks.

13. 11
Limitations of
MOSFETS
Loss during switching transition .
Average switching power loss
represented by:

14. 12
Overall
Benefits of
Improved efficiency.
No thermal management.
Design is reduced.
Supports higher frequencies.

15. 13
Simulink
Simulation
Using MOSFET

16. 14
Simulation
Result

17. 15
Simulink
Simulation
Using Diode

18. 16
Simulation
Result

19. 17
PROTEUS
Simulation
Using MOSFET

20. 18
Universal
Bridge in
SIMULINK

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