Shema: Bloka Upravlenija Tiristorami

: Allows for the adjustment of the firing angle ( ), typically from 0∘0 raised to the composed with power 180∘180 raised to the composed with power

A (Blok Upravlenija Tiristorami or BUT) is an electronic system designed to generate and distribute control pulses to the gate terminals of thyristors. Its primary function is to regulate the "firing angle" ( shema bloka upravlenija tiristorami

: Varies the portion of each AC wave that is passed to the load. : Allows for the adjustment of the firing

: Produces sharp, high-energy pulses (often using a UJT-based relaxation oscillator or dedicated ICs) that are strong enough to reliably trigger the thyristor gate. ), which determines the exact moment a thyristor

), which determines the exact moment a thyristor begins conducting during an AC half-cycle, thereby controlling the power delivered to a load.

: Uses pulse transformers or opto-isolators to electrically isolate the low-voltage control electronics from the high-voltage power circuit. Common Applications

These units are essential in industrial and heavy-duty electronics where high power management is required: