PSPICE Simulation

The semi-controlled bridge rectifier that has been simulated has four SCRs and a single free-wheeling diode. The program is presented below.

* Full-wave Bridge Rectifier with a resistive load
VIN 1 0 SIN(0 340V 50Hz)
XT1 1 2 5 2 SCR
XT2 0 2 6 2 SCR
XT3 4 0 7 0 SCR
XT4 4 1 8 1 SCR
VP1 5 2 PULSE(0 10 1667U 1N 1N 100U 20M)
VP2 6 2 PULSE(0 10 11667U 1N 1N 100U 20M)
VP3 7 0 PULSE(0 10 1667U 1N 1N 100U 20M)
VP4 8 1 PULSE(0 10 11667U 1N 1N 100U 20M)
D1 4 2 DNAME
L1 2 3 31.8M
R1 3 4 10
R2 1 0 1MEG
R3 2 0 1MEG
R4 4 0 1MEG
.MODEL DNAME D(IS=10N N=1 BV=1200 IBV=10E-3 VJ=0.6)

* 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 0.0MS 10US
.FOUR 50 V(2,4) I(VIN)
.PROBE
.OPTIONS(ABSTOL=1N RELTOL=.01 VNTOL=1MV)
.END

The waveforms obtained are displayed.

The waveform of bridge output voltage

The waveform of mains current

The waveform of current through the free-wheeling diode

 
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