Q2004L31V
| Model | Q2004L31V |
| Description | Thyristor Product Catalog |
| PDF file | Total 224 pages (File size: 3M) |
| Chip Manufacturer | TECCOR |
AN1003
Application Notes
phase angle. Thus, a 180° conduction angle in a half-wave circuit
provides 0.5 x full-wave conduction power.
In a full-wave circuit, a conduction angle of 150° provides 97%
full power while a conduction angle of 30° provides only 3% of full
power control. Therefore, it is usually pointless to obtain conduc-
tion angles less than 30° or greater than 150°
.
Figure AN1003.5 and Figure AN1003.6 give convenient direct
output voltage readings for 115 V/230 V input voltage. These
curves also apply to current in a resistive circuit.
HALF WAVE
1.8
1.6
Normalized Sine Wave RMS Voltage Power
as Fraction of Full Conduction
Peak Voltage
1.4
1.2
1.0
θ
RMS
0.8
Power
0.6
0.4
0.2
AVG
0
0
20
40
60
80
100 120 140 160 180
Conduction Angle (
θ
)
Input
Voltage
230 V 115 V
360 180
320 160
HALF WAVE
θ
Peak Voltage
280 140
240 120
Output Voltage
200 100
RMS
160
120
80
60
40
AVG
40
20
0
Figure AN1003.3
Half-Wave Phase Control (Sinusoidal)
80
θ
FULL WAVE
0
θ
Figure AN1003.5
0
20
40
60
80
100 120 140 160 180
Conduction Angle (θ)
1.8
1.6
Peak Voltage
Normal Sine Wave RMS Voltage Power
as Fraction of Full Conduction
Output Voltage of Half-wave Phase
1.4
1.2
RMS
1.0
Power
0.8
0.6
0.4
AVG
0.2
0
0
20
40
60
80
100 120 140 160 180
Conduction Angle (θ)
80
40
20
0
0
20
40
60
80
320 160
Peak Voltage
280 140
240 120
Output Voltage
θ
Input
Voltage
230 V 115 V
360 180
FULL WAVE
θ
RMS
200 100
160
120
80
AVG
60
Figure AN1003.4
Symmetrical Full-Wave Phase Control (Sinusoidal)
40
0
Figure AN1003.3 and Figure AN1003.4 also show the relative
power curve for constant impedance loads such as heaters.
Because the relative impedance of incandescent lamps and
motors change with applied voltage, they do not follow this curve
precisely. To use the curves, find the full-wave rated power of the
load, and then multiply by the ratio associated with the specific
100 120 140 160 180
Conduction Angle (θ)
Figure AN1003.6
Output Voltage of Full-wave Phase Control
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+1 972-580-7777
AN1003 - 2
©2002 Teccor Electronics
Thyristor Product Catalog
