K0900E70 Datasheet, PDF (188/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1009
Characteristics Formulas for Phase Control Circuits
Circuit
Name
Half-wave
Resistive
Load
Max Thyristor
Voltage
1.4 E_RMS
PRV
SCR
E_P
Full-wave
1.4 E_RMS
E_P
Bridge
Full-wave
1.4 E_RMS
E_P
AC Switch
Resistive
Load
NOTE: Angle alpha (α) is in radians.
Max. Load
Voltage
E_d=Avg.
E_a=RMS
E_d = ^E---_π--^P--
E_a
=
-E----^P--
2
E_d = -2---E-_π----^P-
E_a
=
-E----^P--
1.4
Load Voltage
with Delayed Firing
E_d = -E2----_π^P--(1 + cos α)
E_a
=
--E----^P----
2π
èæ^π
–
α
+
1--
2
sin
2
α_øö
Ed
=
--E----^P---- (1 + cos α)
2π
E_a
=
--E-----^P---
2π
èæ^π
–
α
+
1--
2
sin
2
α_øö
Application Notes
Max. Average Thyristor
or Rectifier Current
Avg. Amps
π^-E---R-P--
Cond. Period
180
π^-E---R-P--
180
π^-E---R-P--
180
E_RMS
R Load
Half-wave Resistive Load – Schematic
E
Full-wave Bridge – Schematic
L
Load
R
E_RMS
R
Load
Full-wave AC Switch Resistive Load – Schematic
E_P
0
α
Half-wave Resistive Load – Waveform
E_P
0
α
Full-wave Bridge – Waveform
E_P
0
α
Full-wave AC Switch Resistive Load – Waveform
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AN1009 - 4
©2002 Teccor Electronics
Thyristor Product Catalog