PSPICE Simulation
The program below presents a PSPICE program. The circuit
used is shown below. 
The PSPICE program shown below presents the SCR as a subcircuit. This model
of the SCR has been described in the book SPICE FOR POWER ELECTRONICS
AND ELECTRIC POWER (Muhammed H.Rashid, Prentice-Hall , 1993, pages
148-160). * Half-wave Rectifier with RL Load
* A problem to find the SCR current
VIN 1 0 SIN(0 340V 50Hz)
XT1 1 2 5 2 SCR
VP 5 2 PULSE(0 10 1667U 1N 1N 100U 20M)
L1 2 3 31.8MH
R1 3 0 10
* Subcircuit for SCR
.SUBCKT SCR 101 102 103 102
S1 101 105 106 102 SMOD
RG 103 104 50
VX 104 102 DC 0
VY 105 107 DC 0
DT 107 102 DMOD
RT 106 102 1
CT 106 102 10U
F1 102 106 POLY(2) VX VY 0 50 11
.MODEL SMOD VSWITCH(RON=0.0105 ROFF=10E+5 VON=0.5 VOFF=0)
.MODEL DMOD D((IS=2.2E-15 BV=1200 TT=0 CJO=0)
.ENDS SCR
.TRAN 10US 60.0MS 20.0MS 10US
.PROBE
.OPTIONS(ABSTOL=1N RELTOL=.01 VNTOL=1MV)
.END
The waveforms obtained are presented below.
The voltage waveform at the cathode of the SCR
The load current waveform
The inductor voltage waveform
The voltage waveform acros the SCR
The voltage waveform of the pulse source used for triggering the SCR
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