CONTROLLED HALF WAVE RECTIFIER -- EXAMPLE 3-11 (contsw.cir)
*VOLTAGE CONTROLLED SWITCH FOR SCR
.PARAM VM={120*SQRT(2)}
.PARAM ALPHA=45   ;DELAY ANGLE IN DEGREES
.PARAM DLAY={ALPHA/360/60}
.PARAM PW={1/60 - DLAY*1.1}
VS 1 0 SIN(0 {VM} 60)
R 3 4 20
L 4 0 0.04 IC=0
SWITCH 1 2 10 0 SMOD                                ;switch in SCR model
DIODE 2 3 DMOD                                                             ;diode in SCR model
VPULSE 10 0 PULSE(-2V 2V {DLAY} 1NS 1NS {PW} {1/60});control for switch
.MODEL SMOD VSWITCH(RON=.001)
.MODEL DMOD D
.TRAN .1MS 33.33MS 0 .05MS UIC
.PROBE
.END