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