Design and Construction of Single Phase Cycloconverter
Rajib Baran Roy1, Md. Ruhul Amin2

1Rajib Baran Roy, Assistant Professor, Department of Electrical and Electronic Engineering, University of Information Technology and Sciences,  Dhaka, Bangladesh.
2Md. Ruhul Amin, Laboratory Demonstrator, Department of Electrical and Electronic Engineering, University of Information Technology and Sciences,  Dhaka, Bangladesh.

Manuscript received on 18 August 2012 | Revised Manuscript received on 25 August 2012 | Manuscript published on 30 August 2012 | PP: 75-82 | Volume-1 Issue-3, August 2012 | Retrieval Number: C0263071312/2012©BEIESP
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Abstract: The variable frequency has always been of great importance in the industrial world. The generating station generates electricity of the frequency of 50 Hz which is not always applicable for some electrical appliances. Some electrical devices need variable frequency ranging from one tenth to one third of the supply frequency. Some examples are induction motors used in AC traction, aircraft power supplies, mobile power supplies and others. Therefore the variable frequency generation becomes necessary for meeting the ever growing demand of industrial application. The cyclo-converter is such a device which generates variable frequency. The development of the semiconductor devices has made it possible to control the frequency of the cycloconverter according to the requirement and deliver a large amount of controlled power with the help of semiconductor switching devices like thyristors and others. The aim of this project is to design and construct a single phase cycloconverter circuit which could generate variable frequency. The proper generation of the blanking and gate pulses of the switching devices and synchronizing them with the input signal is the most important thing in designing a cyclo-converter circuit which becomes easier due to the availability of the integrated circuit(IC). The use of 555 timer and operational amplifier ICs has simplified the generation of blanking and triggering signals. Moreover the synchronization of these signals with the input signal is performed by means of the comparator circuit where the operational amplifier IC is used. Due to the cost constraint, a transformer of secondary rating of 9V and 800mA is considered for designing the cycloconverter which delivers a power of about 7 W. This similar circuit can be used for large scale output power after some modifications in the control circuit. The cycloconverter circuit is designed as a prototype and the aspects of the commercial cycloconverter are not considered.
Keywords: Cycloconverter, Intergrated Cicuit Synchronization, Variable Frequency Generation, Prototype.

Scope of the Article: Frequency Selective Surface