Synchronous-Buck MOSFET Drivers With Dead-Time Control (Rev. B)
Synchronous rectification using mosfet
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Transcript of Synchronous rectification using mosfet
AC TO DC CONVERSION USING MOSFETS
Table of Contents
Introduction
Rectification
Types of Rectification
MOSFET Rectification
Comparison
Advantages
Simulation
1
AC TO DC CONVERSION
convert alternating current (AC) to (DC).
Used for almost all appliances.
2
Passive & ActiveAC-DC
Conversion
Passive rectification.
Active rectification.
3
Half-wave Rectifier
Rectifies only half cycle of the waveform.
consist a step down transformer, a diode and a load resistance.
4
Full Wave Bridge Rectifier
Full Wave Bridge Rectifier circuit four diodes are used.
Conducts for both positive and negative half cycles and gives .
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
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 from Vin over P-M1, RLoad, N-M2, and reaches the starting point Vin again.
During the negative half-cycle, P-M2 and N-M1 turn ON.
7
MOSFET over Diodes
High power losses .
Thermal dissipation.
Coast
Small RDON
8
Power loss comparison
Comparison
9
Get rid of transformer or boost circuits
Step-up transformer.
Decrease turns ratio.
10
Heat sink requirement
Avoid expensive and bulky heat sinks.
11
Limitations of MOSFETS
Loss during switching transition .
Average switching power loss represented by:
12
Overall Benefits of
Improved efficiency.
No thermal management.
Design is reduced.
Supports higher frequencies.
13
Simulink SimulationUsing MOSFET
14
Simulation Result
15
Simulink SimulationUsing Diode
16
Simulation Result
17
PROTEUS SimulationUsing MOSFET
18
Universal Bridge in SIMULINK
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