CYCLOCONVETERS BY:- Dr.S.NARASIMHA
CYCLOCONVERTER A Device which converts input power at one frequency to output power at a different frequency with one- stage conversion. AC to AC conversion Developed in 1930 , GERMANY Uses SCR (THYRISTORS) Force commutation
CONTENTS INTRODUCTION TYPES PRINCIPLE SINGLE PHASE CYCLOCONVETER THREE PHASE CYCLOCONVERTER
TYPES Step up cycloconverter ( Fo>Fs ) Step down cycloconverter( Fo<Fs ) Single phase to single phase Mid-point cycloconverter Bridge type cycloconverter Three phase cycloconverter
SINGLE PHASE CYCLOCONVETER Step up Cycloconverter:- LOW Frequency to HIGH Frequency Step down Cycloconverter:- HIGH Frequency to LOW Frequency
LOW TO HIGH FREQUENCY CONVERTER STEP-UP CYCLONVERTER LOW TO HIGH FREQUENCY CONVERTER MID-POINT CYCLOCONVERTER BRIDGE TYPE CYCLOCONVERTER
MID-POINT CYCLONVERTER
BRIDGE TYPE CYCLONVERTER
STEP-DOWN CYCLONVERTER HIGH TO LOW FREQUENCY CONVERTER MID POINT CYCLOCONVERTER BRIDGE TYPE CYCLOCONVERTER
MID-POINT CYCLONVERTER
BRIDGE TYPE CYCLONVERTER
THREE PHASE CYCLOCONVERTER THREE PHASE TO SINGLE PHASE THREE PHASE TO THREE PHASE
THREE PHASE TO SINGLE PHASE
THREE PHASE TO THREE PHASE
FEATURES Direct conversion Compact system Variable speed range ADVANTAGES Direct conversion Compact system Variable speed range High quality wave Low speed applications DIS-ADVANTAGES Large number of thyristors Complex circuitry Output frequency is limited
APPLICATIONS SPEED CONTROL DRIVES INDUCTION HEATING VARIABLE FREQUENCY INPUT AND GETTING CONSTANT OUTPUT
Applications of Cycloconverters: Cycloconverters can produce harmonic rich output voltages. When cycloconverters are using for a running AC machine, the leakage inductance of the machine filters most of the high frequency harmonics and reducing voltage of the lower order harmonics.
Controlling the Speed of the Single Phase Induction Motor Some other applications where Cycloconverters can be used are cement mill drives, ship propulsion drives, Rolling mills, and mine winders, washing machines, water pumps and used in industries as well.
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