AC Power Control: Adjustable Phase Angle Control with triac using ATmega8

Here, the gate is driven 4ms after the zero-crossing (only PORTB2/PINB2 low : DIP-switch state = 4):

Fig. 7 – 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 4.8ms after the zero-crossing (PORTB2/PINB2 and PORTB0/PINB0 low : DIP-switch state = 5):

Fig. 8 – Triac firing with 4.8 ms delay

Green: Input AC

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Yellow: AC Output after phase angle control
Pink: Gate Drive signal

Here, the gate is driven 5.6ms after the zero-crossing (PORTB2/PINB2 and PORTB1/PINB1 low : DIP-switch state = 6):

Fig. 9 – Triac firing with 5.6 ms delay

Green: Input AC

Yellow: AC Output after phase angle control
Pink: Gate Drive signal

Here, the gate is driven 6.4ms after the zero-crossing (PORTB2/PINB2, PORTB1/PINB1 and PORTB0/PINB0 all low : DIP-switch state = 7):

Fig. 10 – Triac firing with 6.4 ms delay

Green: Input AC

Yellow: AC Output after phase angle control
Pink: Gate Drive signal

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