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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 9 : Silicon Controlled Rectifier"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.1, Page No. 238 "
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# average voltage\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Vm=200.0 #in V\n",
"theta=30.0 #firing angle in degree\n",
"\n",
"#Calculations\n",
"vdc=((Vm/math.pi)*(1+math.cos(theta*math.pi/180)))\n",
"\n",
"#Result\n",
"print(\"average value of voltage is ,(V)= %.f\"%(round(vdc)))\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"average value of voltage is ,(V)= 119\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.2, Page No. 238"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# dc load current rms load current amd power dissipiated\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Va=300.0 # in V\n",
"Vm=300.0*math.sqrt(2) # in V\n",
"Rl=50.0 #in ohm\n",
"theta1=90.0 #firing angle in degree\n",
"\n",
"#Calculations\n",
"idc=((Vm/(2*math.pi*Rl))*(1+math.cos(theta1*math.pi/180)))\n",
"irms=Va/(2*Rl)\n",
"P=irms**2*Rl\n",
"\n",
"#Result\n",
"print(\"(i) The dc load current is ,(A) = %.2f\"%idc)\n",
"print(\"(ii) The rms load current is ,(A) = %.f\"%(round(irms)))\n",
"print(\"(iii) The power dissipated by the load is ,(W)= %.f\"%(round(P)))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(i) The dc load current is ,(A) = 1.35\n",
"(ii) The rms load current is ,(A) = 3\n",
"(iii) The power dissipated by the load is ,(W)= 450\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9.3, Page No. 239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# firing angle conducting angle and average current\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Ih=0.0 #in A\n",
"Vi=100.0 #in V\n",
"Vm=200.0 #in V\n",
"Rl=100.0 #in ohm\n",
"\n",
"#Calculations\n",
"theta1=(180/math.pi)*math.asin(Vi/Vm) #firing angle in degree\n",
"ca=180-theta1 #conducting angle in dehree\n",
"av=((Vm/(2*math.pi))*(1+math.cos(theta1*math.pi/180)))\n",
"ac=av/Rl \n",
"\n",
"#Result \n",
"print(\"(i) firing angle is ,(degree) = %.f\u00b0\"%(theta1))\n",
"print(\"(ii) conducting angle is ,(degree) = %.f\u00b0\"%ca)\n",
"print(\"(iii) average current is ,(A) = %.4f\"%ac)\n",
"#average current is wrong in the textbook"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(i) firing angle is ,(degree) = 30\u00b0\n",
"(ii) conducting angle is ,(degree) = 150\u00b0\n",
"(iii) average current is ,(A) = 0.5940\n"
]
}
],
"prompt_number": 10
}
],
"metadata": {}
}
]
}
|
