Thyristor SCR Controlled Rectifier Circuit

Published:2011/8/4 0:08:00 Author:Robert | Keyword: Thyristor, SCR, Controlled, Rectifier | From:SeekIC

The controlled rectifier circuit's function is changing the AC power to the voltage-controlled DC power. The picture shows the single-phase half-controlled bridge rectifier testing circuit. The main circuit is made up of load RL (lamp) and thyristor T1. The trigger circuit is single-junction transistor T2 and a RC-bridge phase-shift trigger circuit which is made up of some RC elements. By change the thyristor T1's conduction angle it could adjust the main circuit's controlled output rectified voltage (or current)'s value. This could be seen from the variation of the brightness of the lamp load. The thyristor's conduction angle's value is determined by the trigger frequency f which could be calculated from the formula of f=(1/RC)ln(1/1-η).



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