Stepless triac dimmers

  
Closed lights switch S, 220V AC via RP1, RP2 R and the capacitor C2 is charged when the voltage across C2 reaches diac breakover voltage of VD, VD and triac vs sequentially tur
Stepless triac dimmers - schematic

ned on, the controlled lighting H lamp is energized to emit light. When the AC zero-crossing is reversed, vs off on their own, C2 began to reverse charge, repeat the process. Seen within each AC cycle, vs positive and negative half-cycle are symmetrical conduction time. If the size of the resistance regulator RPI, it will change the charge rate of the capacitor C2, thereby making any half weeks vs trigger on-time forward or backward, that is changing vs conduction angle size, the corresponding increase in both ends of the lamp H the average voltage also changes, it can achieve the purpose of stepless dimming.




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