2DC
2-3-6
Figure 2-3-5 Heater lamp turn-on variations
Variation
No.1
(Duty 100 %)
Variation
No.2
(Duty 80 %)
Variation
No.3
(Duty 60 %)
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
Off
On
On
Off
On
On
Off
On
On
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
On
On
Off
Off
+
−
+
−
+
−
Variation
No.4
(Duty 40 %)
+
−
Variation
No.5
(Duty 0 %)
+
−
Heater lamp turn-on pattern in 1 cycle (10 half waves)
AC wave
1
2
3
4
5
6
7
8
9
10
0 V
0 V
0 V
0 V
0 V
Conductivity
staus of Triac
(TRC1)
Zero
cross
point
