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diff --git a/Power_Electronics/Chapter2_3.ipynb b/Power_Electronics/Chapter2_3.ipynb new file mode 100755 index 00000000..1872c9f4 --- /dev/null +++ b/Power_Electronics/Chapter2_3.ipynb @@ -0,0 +1,233 @@ +{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 02 : Power Semiconductor Diodes and Transistors"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2.1, Page No 21"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#initialisation of variables\n",
+ "B=40.0\n",
+ "R_c=10 #ohm\n",
+ "V_cc=130.0 #V\n",
+ "V_B=10.0 #V\n",
+ "V_CES=1.0 #V\n",
+ "V_BES=1.5 #V\n",
+ "\n",
+ "#Calculations\n",
+ "I_CS=(V_cc-V_CES)/R_c #A\n",
+ "I_BS=I_CS/B #A\n",
+ "R_B1=(V_B-V_BES)/I_BS\n",
+ "P_T1=V_BES*I_BS+V_CES*I_CS\n",
+ "ODF=5\n",
+ "I_B=ODF*I_BS\n",
+ "R_B2=(V_B-V_BES)/I_B\n",
+ "P_T2=V_BES*I_B+V_CES*I_CS\n",
+ "B_f=I_CS/I_B\n",
+ "\n",
+ "#Results\n",
+ "print(\"value of R_B in saturated state= %.2f ohm\" %R_B1)\n",
+ "print(\"Power loss in transistor=%.2f W\" %P_T1)\n",
+ "print(\"Value of R_B for an overdrive factor 5 = %.2f ohm\" %R_B2)\n",
+ "print(\"Power loss in transistor = %.2f W\" %P_T2)\n",
+ "print(\"Forced current gain=%.0f\" %B_f)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "value of R_B in saturated state= 26.36 ohm\n",
+ "Power loss in transistor=13.38 W\n",
+ "Value of R_B for an overdrive factor 5 = 5.27 ohm\n",
+ "Power loss in transistor = 15.32 W\n",
+ "Forced current gain=8\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2.2, Page No 24"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#initialisation of variables\n",
+ "I_CEO=2*10**-3 #A\n",
+ "V_CC=220.0 #V\n",
+ "P_dt=I_CEO*V_CC #instant. power loss during delay time\n",
+ "t_d=.4*10**-6 #s\n",
+ "f=5000\n",
+ "P_d=f*I_CEO*V_CC*t_d #avg power loss during delay time\n",
+ "V_CES=2 #V\n",
+ "t_r=1*10**-6 #s\n",
+ "I_CS=80 #A\n",
+ "\n",
+ "#Calculations\n",
+ "P_r=f*I_CS*t_r*(V_CC/2-(V_CC-V_CES)/3) #avg power loss during rise time\n",
+ "t_m=V_CC*t_r/(2*(V_CC-V_CES))\n",
+ "P_rm=I_CS*V_CC**2/(4*(V_CC-V_CES)) #instant. power loss during rise time\n",
+ "\n",
+ "#Results\n",
+ "P_on=P_d+P_r \n",
+ "print(\"Avg power loss during turn on = %.2f W\" %P_on)\n",
+ "P_nt=I_CS*V_CES \n",
+ "print(\"Instantaneous power loss during turn on = %.0f W\" %P_nt)\n",
+ "t_n=50*10**-6\n",
+ "P_n=f*I_CS*V_CES*t_n\n",
+ "print(\"Avg power loss during conduction period = %.0f W\" %P_n)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Avg power loss during turn on = 14.93 W\n",
+ "Instantaneous power loss during turn on = 160 W\n",
+ "Avg power loss during conduction period = 40 W\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2.3 Page No 26"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#initialisation of variables\n",
+ "I_CEO=2*10**-3 #A\n",
+ "V_CC=220 #V\n",
+ "t_d=.4*10**-6 #s\n",
+ "f=5000\n",
+ "V_CES=2 #V\n",
+ "t_r=1*10**-6 #s\n",
+ "I_CS=80 #A\n",
+ "t_n=50*10**-6 #s\n",
+ "t_0=40*10**-6 #s\n",
+ "t_f=3*10**-6 #s\n",
+ "\n",
+ "#Calculations\n",
+ "P_st=I_CS*V_CES # instant. power loss during t_s\n",
+ "P_s=f*I_CS*V_CES*t_f #avg power loss during t_s\n",
+ "P_f=f*t_f*(I_CS/6)*(V_CC-V_CES) #avg power loss during fall time\n",
+ "P_fm=(I_CS/4)*(V_CC-V_CES) #peak instant power dissipation\n",
+ "P_off=P_s+P_f\n",
+ "\n",
+ "#Results\n",
+ "print(\"Total avg power loss during turn off = %.2f W\" %P_off)\n",
+ "P_0t=I_CEO*V_CC\n",
+ "print(\"Instantaneous power loss during t_0 = %.2f W\" %P_0t)\n",
+ "P_0=f*I_CEO*V_CC*t_0 #avg power loss during t_s\n",
+ "P_on=14.9339 #W from previous eg\n",
+ "P_n=40 #W from previous eg\n",
+ "P_T=P_on+P_n+P_off+P_0 \n",
+ "print(\"Total power loss = %.2f W\" %P_T)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total avg power loss during turn off = 44.91 W\n",
+ "Instantaneous power loss during t_0 = 0.44 W\n",
+ "Total power loss = 99.93 W\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2.4, Page No 28"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "#initialisation of variables\n",
+ "I_CS=100.0 \n",
+ "V_CC=200.0 \n",
+ "t_on=40*10**-6\n",
+ "\n",
+ "#Calculations\n",
+ "P_on=(I_CS/50)*10**6*t_on*(V_CC*t_on/2-(V_CC*10**6*t_on**2/(40*3))) #energy during turn on\n",
+ "t_off=60*10**-6\n",
+ "P_off=(I_CS*t_off/2-(I_CS/60)*10**6*(t_off**2)/3)*((V_CC/75)*10**6*t_off) #energy during turn off\n",
+ "P_t=P_on+P_off #total energy\n",
+ "P_avg=300.0\n",
+ "f=P_avg/P_t\n",
+ "\n",
+ "#Results\n",
+ "print(\"Allowable switching frequency = %.2f Hz\" %f)\n",
+ "#in book ans is: f=1123.6 Hz. The difference in results due to difference in rounding of of digits"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Allowable switching frequency = 1125.00 Hz\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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