MD_SHAHRUKH
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Hello everyone,
I am using BT136 triac, MOC3021 optocoupler, and AT89C2051 µC and AN33 with rectifier and a step down transformer for zero crossing detection.
The circuit is availabe in multiple website for the system.
What I am doing here is, with AN33 I am detecting zero crossing and firing gate trigger to triac via MOC3021. Here the Triac input voltage is 230 volts, 50Hz. According to the concept, after rectification the the pulse will detected at 100 Hz (Zero crossing), i.e., 10 milisecond. So, I am taking a delay 2 at milisecond and firing a gate trigger pulse of width 60 microsecond. I have varies the delay time of triggering from 2 milisecond to 8 milisecond, at 2 ms, bulb is perfectly glowing but on incresing the delay, the intensity is not decresing but flickering. I want to dimm the bulb.
Can you tell me the possible mistakes I am doing. I want to dim the bulb.
Thank you.
Shahrukh.
I am using BT136 triac, MOC3021 optocoupler, and AT89C2051 µC and AN33 with rectifier and a step down transformer for zero crossing detection.
The circuit is availabe in multiple website for the system.
What I am doing here is, with AN33 I am detecting zero crossing and firing gate trigger to triac via MOC3021. Here the Triac input voltage is 230 volts, 50Hz. According to the concept, after rectification the the pulse will detected at 100 Hz (Zero crossing), i.e., 10 milisecond. So, I am taking a delay 2 at milisecond and firing a gate trigger pulse of width 60 microsecond. I have varies the delay time of triggering from 2 milisecond to 8 milisecond, at 2 ms, bulb is perfectly glowing but on incresing the delay, the intensity is not decresing but flickering. I want to dimm the bulb.
Can you tell me the possible mistakes I am doing. I want to dim the bulb.
Thank you.
Shahrukh.