Synchronous rectification using mosfet

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AC TO DC CONVERSION USING MOSFETS

Transcript of Synchronous rectification using mosfet

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AC TO DC CONVERSION USING MOSFETS

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Table of Contents

Introduction

Rectification

Types of Rectification

MOSFET Rectification

Comparison

Advantages

Simulation

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AC TO DC CONVERSION

convert alternating current (AC) to (DC).

Used for almost all appliances.

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Passive & ActiveAC-DC

Conversion

Passive rectification.

Active rectification.

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Half-wave Rectifier

Rectifies only half cycle of the waveform.

consist a step down transformer, a diode and a load resistance.

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Full Wave Bridge Rectifier

Full Wave Bridge Rectifier circuit four diodes are used.

Conducts for both positive and negative half cycles and gives .

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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

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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.

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MOSFET over Diodes

High power losses .

Thermal dissipation.

Coast

Small RDON

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Power loss comparison

Comparison

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Get rid of transformer or boost circuits

Step-up transformer.

Decrease turns ratio.

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Heat sink requirement

Avoid expensive and bulky heat sinks.

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Limitations of MOSFETS

Loss during switching transition .

Average switching power loss represented by:

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Overall Benefits of

Improved efficiency.

No thermal management.

Design is reduced.

Supports higher frequencies.

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Simulink SimulationUsing MOSFET

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Simulation Result

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Simulink SimulationUsing Diode

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Simulation Result

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PROTEUS SimulationUsing MOSFET

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Universal Bridge in SIMULINK

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