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-{

- "metadata": {

-  "name": ""

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "Chapter 20 : Thyristors "

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.1, Page No 902"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "Vs=25.0\n",

-      "Vtm=1.7\n",

-      "Rl=25.0\n",

-      "Ih=5*10**-3\n",

-      "\n",

-      "#Calculations\n",

-      "Vspk=1.414*Vs\n",

-      "Ilpk=(Vs-Vtm)/Rl\n",

-      "print(\" for half wave rectifier sinusodial waveform\")\n",

-      "Ilrms=.5*Ilpk\n",

-      "es=Vtm+(Ih*Rl)\n",

-      "\n",

-      "#Results\n",

-      "print(\" switch-off voltage =%.2f v\" %es)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " for half wave rectifier sinusodial waveform\n",

-        " switch-off voltage =1.82 v\n"

-       ]

-      }

-     ],

-     "prompt_number": 15

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.2, Page No 905"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "Vs=30.0\n",

-      "Vd1=.7\n",

-      "Vg=.8\n",

-      "Ig=200*10**-6\n",

-      "\n",

-      "#Calculations\n",

-      "Vspk=1.414*Vs\n",

-      "print(\" at 5 degree\")\n",

-      "es=Vspk*.087           #  sin5=.087\n",

-      "print(\" at 90 degree\")\n",

-      "es=Vspk\n",

-      "Vt=Vd1+Vg\n",

-      "print(\" to trigger at es=3.7V the R2 moving contact is at the top\")\n",

-      "es=3.7\n",

-      "Vr1=es-Vt\n",

-      "I1=1*10**-3\n",

-      "R1=Vr1/I1\n",

-      "R=Vt/I1         #R=R2+R3\n",

-      "es=42.4\n",

-      "Vr3=Vt\n",

-      "I1=es/(R+R1)\n",

-      "R3=Vt/I1\n",

-      "R2=R-R3\n",

-      "\n",

-      "#Results\n",

-      "print(\" To trigger at es =42.4 the R2 moving contact at the bottom =%.2f\" %R2)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " at 5 degree\n",

-        " at 90 degree\n",

-        " to trigger at es=3.7V the R2 moving contact is at the top\n",

-        " To trigger at es =42.4 the R2 moving contact at the bottom =1369.10\n"

-       ]

-      }

-     ],

-     "prompt_number": 16

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.3 Page No 906"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "R1=2.2*10**3\n",

-      "R2=1.5*10**3\n",

-      "R3=120.0\n",

-      "Vt=1.5\n",

-      "\n",

-      "#Calculations\n",

-      "Vak1=Vt*((R1+R2+R3)/(R3+.5*R2))\n",

-      "Vak2=Vt*((R1+R2+R3)/R3)\n",

-      "\n",

-      "\n",

-      "#Results\n",

-      "print(\" with R2 contact at center = %.2f\" %Vak1)\n",

-      "print(\" with R2 contact at zero = %.2f\" %Vak2)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " with R2 contact at center = 6.59\n",

-        " with R2 contact at zero = 47.75\n"

-       ]

-      }

-     ],

-     "prompt_number": 17

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.4, Page No 911"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "Vs=5.0\n",

-      "Ilmax=300*10**-3\n",

-      "Vl=7.0\n",

-      "Vg=0.8\n",

-      "\n",

-      "\n",

-      "#Calculations\n",

-      "Vz=Vl-Vg\n",

-      "print(\" for D1, select a 1N753 with Vz=6.2\")\n",

-      "Izmin=1*10**-3\n",

-      "R1=Vg/Izmin\n",

-      "\n",

-      "\n",

-      "#Results\n",

-      "print(\"The value of R1 is %d kohm \" %R1)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        " for D1, select a 1N753 with Vz=6.2\n",

-        "The value of R1 is 800 kohm \n"

-       ]

-      }

-     ],

-     "prompt_number": 18

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.5 Page No 911"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "R1=25*10**3\n",

-      "R2=2.7*10**3\n",

-      "C1=3*10**-6\n",

-      "Vg=0.8\n",

-      "Vd1=8.0\n",

-      "Vs=115.0\n",

-      "f=60.0\n",

-      "\n",

-      "#Calculations\n",

-      "Vc1=Vd1+Vg\n",

-      "#assume the average charging voltage is\n",

-      "Vac=1.414*Vs\n",

-      "E=.636*Vac\n",

-      "#average charging\n",

-      "Ic=E/(R1+R2)\n",

-      "#charging time\n",

-      "t=(C1*Vc1)/Ic\n",

-      "T=1/f\n",

-      "q=(t*360)/T\n",

-      "a=180-q\n",

-      "\n",

-      "#Results\n",

-      "print(\"Conduction angle =%.2f degrees\" %a)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Conduction angle =27.27 degrees\n"

-       ]

-      }

-     ],

-     "prompt_number": 19

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.6 Page No 925"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "\n",

-      "#initialisation of variables\n",

-      "Vs=10.0\n",

-      "Vf=1.7\n",

-      "Is=500*10**-6\n",

-      "Ih=1.5*10**-3\n",

-      "E=30.0\n",

-      "\n",

-      "#Calculations\n",

-      "R=27*10**3\n",

-      "C=0.5*10**-6\n",

-      "R1max=(E-Vs)/Is\n",

-      "R1min=(E-Vf)/Ih\n",

-      "t=C*R*math.log((E-Vf)/(E-Vs))\n",

-      "\n",

-      "\n",

-      "#Results\n",

-      "print(\"Capacitor charging time is %3.4f s\" %t)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Capacitor charging time is 0.0047 s\n"

-       ]

-      }

-     ],

-     "prompt_number": 20

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.7, Page No 931"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "Rbb=4.0*10**3\n",

-      "Pd25=360.0*10**-3\n",

-      "D=2.4*10**-3\n",

-      "T2=100.0\n",

-      "\n",

-      "#Calculations\n",

-      "Pd=Pd25-D*(T2-25)\n",

-      "Vb1b1=math.sqrt(Rbb*Pd)\n",

-      "\n",

-      "#Results\n",

-      "print(\"Maximum Vb1b1 that should be used at a temp 100 is %3.1fV \" %Vb1b1)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Maximum Vb1b1 that should be used at a temp 100 is 26.8V \n"

-       ]

-      }

-     ],

-     "prompt_number": 21

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.8 Page No 931"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math \n",

-      "\n",

-      "#initialisation of variables\n",

-      "Vb1b1=25\n",

-      "nmax=0.86\n",

-      "nmin=0.74\n",

-      "Vd=0.7\n",

-      "\n",

-      "#Calculations\n",

-      "Vpmax=Vd+(nmax*Vb1b1)\n",

-      "Vpmin=Vd+(nmin*Vb1b1)\n",

-      "\n",

-      "#Results\n",

-      "print(\"Maximum Vpmax that should be is %3.1fV \" %Vpmax)\n",

-      "print(\"Minimum Vpmin that should be is %3.1fV \" %Vpmin)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Maximum Vpmax that should be is 22.2V \n",

-        "Minimum Vpmin that should be is 19.2V \n"

-       ]

-      }

-     ],

-     "prompt_number": 22

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 20.9 Page No 933"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "import math\n",

-      "#initialisation of variables\n",

-      "Ip=.6*10**-6\n",

-      "Iv=2*10**-3\n",

-      "Veb1=2.5\n",

-      "Vpmin=19.2\n",

-      "Vpmax=22.2\n",

-      "Vbb=25.0\n",

-      "C=1*10**-6\n",

-      "R=18*10**3\n",

-      "Vp=20.0\n",

-      "\n",

-      "\n",

-      "#Calculations\n",

-      "Vpmin=(Vbb-Vpmax)/Ip\n",

-      "Remax=(Vbb-Veb1)/Iv\n",

-      "t=C*R*math.log((Vbb-Veb1)/(Vbb-Vp))\n",

-      "f=1.0/t\n",

-      "\n",

-      "#Results\n",

-      "print(\"The value of f is %.2f  \" %f)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "The value of f is 36.94  \n"

-       ]

-      }

-     ],

-     "prompt_number": 23

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
\ No newline at end of file