#ElectroTechCC

In industrial applications two forms of electrical energy Direct Current (DC) and Alternate current (AC) are used. Constant voltage and constant current AC is directly available. However, for different applications different forms, different voltages and/or different currents are needed. Converters are needed to achieve different forms. These converters are classified as rectifiers, choppers, inverters and cycloconverters.
A cycloconverter is a device that converts AC, power at one frequency into AC power of an adjustable but lower frequency without any direct current, or DC, stage in between. It can likewise be acknowledged as a static recurrence charger and holds silicon-regulated rectifiers. Cyclo-converters are used in very large variable frequency drives with ratings from few megawatts up to many tens of megawatts.
The principle of the cyclo-converter is described below by using single-phase to single-phase cyclo-converter.
A single phase input cycloconverter is shown below (a) 50 Hz, (b) 25Hz, (c) 12.5 Hz single-phase input to single-phase output cycloconverter is shown below.
Rectifier converts from Single-phase or three-phase AC to variable dc Voltage. Choppers converts from DC to variable dc voltage. Inverters convert from DC to variable magnitude variable frequency single-phase or three-phase AC. Cyclic converters convert from single-phase or three-phase AC to variable magnitude variable frequency single-phase or three-phase AC. A cycloconverter is having four thyristors divided into a positive and negative bank of two thyristors each.
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