Incandescent lamp dimming circuit using thyristor Part 5

(5) Incandescent lamp dimming circuit using thyristor No. 5     The circuit is shown in Figure 2-70. It uses bidirectional thyristors and two sets of resistor-capacitor phase-shifting links, which can increase the phase-shifting angle and expand the adjustment range. The potentiometer RPi is mainly used to control the minimum brightness of the light, and can also be replaced by a fixed resistor; RPz is mainly used to adjust the brightness of the light. The inductor L and the capacitor cl play an anti-interference role.