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A

ac-to-ac converters

These converters are used to obtain a variable ac output voltage Vo from a fixed ac source and a single-phase converter with a TRIAC. A TRIAC allows a current flow in both directions. It can be turned on by applying gate voltages at ωt = α for a current flow in the positive direction, and also at ωt = π + α for a current flow in the negative direction. The output voltage is controlled by varying the conduction time of a TRIAC or firing delay angle, α. These types of converters are also known as ac voltage controllers.

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Ac–dc converters.

A single-phase converter with two natural commutated thyristors

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