A Voltage controller thyristor based dimmer rackAn electrical schematic for a typical SCR-based light dimmer
A voltage controller, also called an AC voltage controller or AC regulator is an electronic module based on either thyristors, triodes for alternating current, silicon-controlled rectifiers or insulated-gate bipolar transistors, which converts a fixed voltage, fixed frequency alternating current (AC) electrical input supply to obtain variable voltage in output delivered to a resistive load. This varied voltage output is used for dimming street lights, varying heating temperatures in homes or industry, speed control of fans and winding machines and many other applications, in a similar fashion to an autotransformer.[1][2] Voltage controller modules come under the purview of power electronics. Because they are low-maintenance and very efficient, voltage controllers have largely replaced such modules as magnetic amplifiers and saturable reactors in industrial use.[2]
^Andrzej M. Trzynadlowski (2010). Introduction to Modern Power Electronics. John Wiley & Sons. pp. 190–220.
^ abSachin S. Sharma (2008). Power Electronics. Firewall Media. p. 177. ISBN 9788131803509.
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