The document discusses cycloconverters, which are devices that convert AC power at one frequency to AC power at another frequency in a single stage using thyristors. It describes the different types of cycloconverters including step-up, step-down, single phase, and three phase cycloconverters. It also discusses the principles, components, applications, advantages, and disadvantages of cycloconverters.

1. PREPARED BY:
MERAJ AKHTAR
ELECTRICAL DEPARTMENT
JAHANGIRABAD INSTITUTE OF TECHNOLOGY
BARABANKI-UP
POWER ELECTRONICS
UNIT-4
CYCLOCONVETERS

2. CONTENTS
INTRODUCTION
TYPES
PRINCIPLE
SINGLE PHASE CYCLOCONVETER
THREE PHASE CYCLOCONVERTER

3. 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

4. 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

5. SINGLE PHASE CYCLOCONVETER
Step up Cycloconverter:-
 LOW Frequency to HIGH Frequency
Step down Cycloconverter:-
 HIGH Frequency to LOW Frequency

6. STEP-UP CYCLONVERTER
LOW TO HIGH FREQUENCY CONVERTER
 MID-POINT CYCLOCONVERTER
 BRIDGE TYPE CYCLOCONVERTER

7. MID-POINT CYCLONVERTER

8. BRIDGE TYPE CYCLONVERTER

9. STEP-DOWN CYCLONVERTER
HIGH TO LOW FREQUENCY CONVERTER
 MID POINT CYCLOCONVERTER
 BRIDGE TYPE CYCLOCONVERTER

10. MID-POINT CYCLONVERTER

11. BRIDGE TYPE CYCLONVERTER

12. THREE PHASE CYCLOCONVERTER
THREE PHASE TO SINGLE PHASE
THREE PHASE TO THREE PHASE

13. THREE PHASE TO SINGLE PHASE

14. THREE PHASE TO THREE PHASE

15. ADVANTAGES DIS-ADVANTAGES
Direct conversion
Compact system
Variable speed range
High quality wave
Low speed applications
Large number of thyristors
Complex circuitry
Output frequency is limited
FEATURES

16. APPLICATIONS
SPEED CONTROL DRIVES
INDUCTION HEATING
VARIABLE FREQUENCY INPUT AND GETTING CONSTANT
OUTPUT

17. THANK YOU !!