800W three-terminal bidirectional thyristor dimmer circuit

Published:2011/4/5 20:44:00 Author:may | Keyword: 800W, three-terminal, bidirectional thyristor, dimmer | From:SeekIC

MBS4991 silicon bilateral switch is produced by Motorala company. We can utilize it to control phase of three-terminal bidirectional thyristor. 1MΩ regulation resistance can let the turn-on angle of three-terminal bidirectional thyristor changing from 0° to about 170°. When adjusting to maximum, the power added to load can reach 97% of full power. Now matter what the posistion the regulation resistance is, turn-on angle of upper half period and the turn-on angle of lower half poriod is exatly equal.



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