Chapter -12 : THYRISTORS

Ex 12.1 Pg 224

In [1]:
I=40#
t=15*10**-3#
SCR=(I**2)*t#
print "SCR=",SCR,'A**2s'

SCR= 24.0 A**2s

Ex 12.2 Pg 224

In [3]:
a=75.0
Is=100.0
tmax=a/Is**2#
print "tmax=",tmax*10**3,'ms'

tmax= 7.5 ms

Ex 12.3 Pg 224

In [4]:
VD=0.7#
n=0.75#
Vbb=12#
Vp=n*Vbb+VD#
print  "Vp=",Vp,"V"

Vp= 9.7 V

Ex 12.4 Pg 225

In [5]:
rb1=4*10**3#
rb2=2.5*10**3#
Vbb=15#
Vd=0.7#
n=rb1/(rb1+rb2)#
print "n=",n##intrinsic standoff ratio
Vp=n*Vbb+Vd#
print "Vp=",Vp,"V" #peak point voltage

n= 0.615384615385
Vp= 9.93076923077 V

Ex 12.5 Pg 225

In [6]:
n=0.60#
rbb=7*10**3#
rb1=rbb*n#
print "rb1=%0.2f"%(rb1*10**-3),"kohm"
rb2=rbb-rb1#
print "rb2=%0.2f"%(rb2*10**-3),"kohm"

rb1=4.20 kohm
rb2=2.80 kohm