SINGLE-PHASE FULL-WAVE CONTROLLED CONVERTERS

Submitted To:- Submitted By:-Mrs. Shimi S.L. Sarvesh Singh

(132521)

Contents

• Introduction

• Single-phase Full-wave Mid-point Converters

• Single-phase Full-wave Bridge Converters

• Single-phase Semiconverter

• Advantages of Single-phase Bridge Converter over mid-point Converter

Introduction

• Single-phase full-wave controlled converters(or rectifiers) also named as single-phase two pulse converters.

• The disadvantages of single-phase half-wave converter are minimised by the use of single-phase full-wave converters.

• In single-phase full-wave converters, voltage at the output terminals can be controlled by adjusting the firing angle delay of the Thyristors.

• There are two basic configurations for full-wave controlled converters.• Mid-point converters• Bridge converters

Single-phase Full-wave Mid-point Converters

Turn-off time

Single-phase Full-wave Bridge Converters

Average value of output voltage V0

Rms value of output voltage

If α<90o

If α>90o

Single-phase Semiconverter

Average value of output voltage V0

Rms value of output voltage

• SCRs are subjected to a peak inverse voltage of 2Vm in mid-point converter and Vm in full converter. Thus for the same voltage and current ratings of SCRs, power handled by mid-point converter is about half of that handled by bridge converter.

• In mid-point converter, each secondary should be able to supply the load power. As such, the transformer rating in mid-point converter is double the load rating. This, however, is not the case in single-phase bridge converter.

Advantages of Single-phase Bridge Converter over mid-point Converter

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