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AC Power Control with Thyristor – Phase Angle Control using triac with PIC16F877A

AC Power Control with Thyristor – Phase Angle Control using triac with PIC16F877A

 

You can clearly see that before the gate driving signal is applied, there is no output (illustrated by the flat yellow line).When the gate driving signal is applied, the triac turns on. There is an output and the triac stays on till the next zero crossing. After this again, there is no output till the next gate drive signal is applied.
Now I’ll show you a few more waveforms, with other initial delays.
Here, the gate is driven 1ms after the zero-crossing:
 Fig. 4 – Triac firing with 1 ms delay
Green: Input AC
Yellow: AC Output after phase angle control
Pink: Gate Drive signal

 

Here, the gate is driven 4ms after the zero-crossing:
 Fig. 5 – Triac firing with 4 ms delay
Green: Input AC
Yellow: AC Output after phase angle control
Pink: Gate Drive signal
Here, the gate is driven 5ms after the zero-crossing:
 Fig. 6 – Triac firing with 5 ms delay
Green: Input AC
Yellow: AC Output after phase angle control
Pink: Gate Drive signal
Here, the gate is driven 6ms after the zero-crossing:

Fig. 7 – Triac firing with 6 ms delay



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Green: Input AC

Yellow: AC Output after phase angle control
Pink: Gate Drive signal
Now, to finish things off, I’ll show you how to find the RMS value of the output voltage.

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