A thyristor dimmer, also known as a silicon-controlled rectifier (SCR) dimmer, is an electronic device used to control the brightness or intensity of lighting or the speed of electric motors in various applications. It works by adjusting the voltage supplied to the load, such as an incandescent lamp or an AC motor, to control the output.
A thyristor rectifier circuit, often known as a thyristor-based rectifier or just an SCR rectifier, is an essential electrical circuit used to convert alternating current (AC) into direct current (DC). Numerous industrial applications, such as power supplies, motor drives, battery charging systems, and others, frequently use this kind of rectification technology.
To turn the thyristor on, a gate voltage is applied, typically requiring a positive pulse greater than a threshold value. Once triggered, the thyristor becomes conductive and allows a significant current to flow from the anode to the cathode. Unlike transistors, thyristors latch in the “on” state even if the gate voltage is removed.