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-{
- "metadata": {
- "name": "",
- "signature": "sha256:7d54e3690fc412ff890e6ea2f39f46cb8c03d3ea660ea034447f2497647b95ed"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h1>Chapter 3: Special-purpose Diodes<h1>"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.1, Page Number:88<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "%pylab inline"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "\n",
- "Welcome to pylab, a matplotlib-based Python environment [backend: module://IPython.zmq.pylab.backend_inline].\n",
- "For more information, type 'help(pylab)'."
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "# variable declaration\n",
- "delVZ=50*10**-3; #voltage in volts, from graph\n",
- "delIZ=5*10**-3; #current in amperes, from rgraph\n",
- "\n",
- "#calculation\n",
- "ZZ=delVZ/delIZ; #zener impedence\n",
- "\n",
- "# result\n",
- "print \"zener impedance = %d ohm \" %ZZ"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "zener impedance = 10 ohm "
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.2, Page Number:89<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "# variable declaration\n",
- "I_ZT=37*10**-3; #IN AMPERES\n",
- "V_ZT=6.80; #IN VOLTS\n",
- "Z_ZT=3.50; #IN OHMS\n",
- "I_Z=50*10**-3; #IN AMPERES\n",
- "\n",
- "#calculation\n",
- "DEL_I_Z=I_Z-I_ZT; #change current\n",
- "DEL_V_Z=DEL_I_Z*Z_ZT; #change voltage\n",
- "V_Z=V_ZT+DEL_V_Z; #voltage across zener terminals\n",
- "print \"voltage across zener terminals when current is 50 mA = %.3f volts\" %V_Z\n",
- "I_Z=25*10**-3; #IN AMPERES\n",
- "DEL_I_Z=I_Z-I_ZT; #change current\n",
- "DEL_V_Z=DEL_I_Z*Z_ZT; #change voltage\n",
- "V_Z=V_ZT+DEL_V_Z; #voltage across zener terminals\n",
- "\n",
- "#result\n",
- "print \"voltage across zener terminals when current is 25 mA = %.3f volts\" %V_Z"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "voltage across zener terminals when current is 50 mA = 6.845 volts\n",
- "voltage across zener terminals when current is 25 mA = 6.758 volts"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.3, Page Number:90<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "# variable declaration\n",
- "V_Z=8.2; #8.2 volt zener diode\n",
- "TC=0.0005; #Temperature coefficient (per degree celsius)\n",
- "T1=60; #Temperature 1 in celsius\n",
- "T2=25; #Temperature 2 in celsius\n",
- "\n",
- "#calculation\n",
- "DEL_T=T1-T2; #change in temp\n",
- "del_V_Z=V_Z*TC*DEL_T; #change in voltage\n",
- "voltage=V_Z+del_V_Z; #zener voltage\n",
- "\n",
- "#result\n",
- "print \"zener voltage at 60 degree celsius = %.3f volt\" %voltage"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "zener voltage at 60 degree celsius = 8.343 volt"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.4, Page Number:90<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "# variable declaration\n",
- "P_D_max=400*10**-3; #power in watts\n",
- "df=3.2*10**-3 #derating factor in watts per celsius\n",
- "del_T=(90-50); #in celsius, temperature difference\n",
- "\n",
- "#calculation\n",
- "P_D_deru=P_D_max-df*del_T; #power dissipated\n",
- "P_D_der=P_D_deru*1000;\n",
- "\n",
- "#result\n",
- "print \"maximum power dissipated at 90 degree celsius = %d mW\" %P_D_der"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "maximum power dissipated at 90 degree celsius = 272 mW"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.5, Page Number: 92<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "# variable declaration\n",
- "V_Z=5.1;\n",
- "I_ZT=49*10**-3;\n",
- "I_ZK=1*10**-3;\n",
- "Z_Z=7;\n",
- "R=100;\n",
- "P_D_max=1;\n",
- "\n",
- "#calculation\n",
- "V_out=V_Z-(I_ZT-I_ZK)*Z_Z; #output voltage at I_ZK\n",
- "V_IN_min=I_ZK*R+V_out; #input voltage\n",
- "I_ZM=P_D_max/V_Z; #current\n",
- "V_out=V_Z+(I_ZM-I_ZT)*Z_Z; #output voltage at I_ZM\n",
- "V_IN_max=I_ZM*R+V_out; #max input voltage\n",
- "\n",
- "#result\n",
- "print \"maximum input voltage regulated by zener diode = %.3f volts\" %V_IN_max\n",
- "print \"minimum input voltage regulated by zener diode = %.3f volts\" %V_IN_min"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "maximum input voltage regulated by zener diode = 25.737 volts\n",
- "minimum input voltage regulated by zener diode = 4.864 volts"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.6, Page Number: 93<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "# variable declaration\n",
- "V_Z=12.0; #voltage in volt\n",
- "V_IN=24.0; #ip voltage in volt\n",
- "I_ZK=0.001; #current in ampere\n",
- "I_ZM=0.050; #current in ampere \n",
- "Z_Z=0; #impedence\n",
- "R=470; #resistance in ohm\n",
- "\n",
- "#calculation\n",
- "#when I_L=0, I_Z is max and is equal to the total circuit current I_T\n",
- "I_T=(V_IN-V_Z)/R; #current\n",
- "I_Z_max=I_T; #max current\n",
- "if I_Z_max<I_ZM : # condition for min currert \n",
- " I_L_min=0;\n",
- "\n",
- "I_L_max=I_T-I_ZK; #max current\n",
- "R_L_min=V_Z/I_L_max; #min resistance\n",
- "\n",
- "#result\n",
- "print \"minimum value of load resistance = %.2f ohm\" %R_L_min\n",
- "print \"minimum curent = %.3f ampere\" %I_L_min\n",
- "print \"maximum curent = %.3f ampere\" %I_L_max"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "minimum value of load resistance = 489.16 ohm\n",
- "minimum curent = 0.000 ampere\n",
- "maximum curent = 0.025 ampere"
- ]
- }
- ],
- "prompt_number": 7
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.7, Page Number: 94<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "# variable declaration\n",
- "V_IN=24.0; #voltage in volt\n",
- "V_Z=15.0; #voltage in volt\n",
- "I_ZK=0.25*10**-3; #current in ampere\n",
- "I_ZT=17*10**-3; #current in ampere\n",
- "Z_ZT=14.0; #impedence\n",
- "P_D_max=1.0; #max power dissipation\n",
- "\n",
- "#calculation\n",
- "V_out_1=V_Z-(I_ZT-I_ZK)*Z_ZT; #output voltage at I_ZK\n",
- "print \"output voltage at I_ZK = %.2f volt\" %V_out_1\n",
- "I_ZM=P_D_max/V_Z;\n",
- "\n",
- "V_out_2=V_Z+(I_ZM-I_ZT)*Z_ZT; #output voltage at I_ZM\n",
- "print \"output voltage a I_ZM = %.2f volt\" %V_out_2\n",
- "R=(V_IN-V_out_2)/I_ZM; #resistance\n",
- "print \"value of R for maximum zener current, no load = %.2f ohm\" %R\n",
- "print \"closest practical value is 130 ohms\"\n",
- "R=130.0;\n",
- "#for minimum load resistance(max load current) zener current is minimum (I_ZK)\n",
- "I_T=(V_IN-V_out_1)/R; #current\n",
- "I_L=I_T-I_ZK; #current\n",
- "R_L_min=V_out_1/I_L; #minimum load resistance\n",
- "\n",
- "#result\n",
- "print \"minimum load resistance = %.2f ohm\" %R_L_min"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "output voltage at I_ZK = 14.77 volt\n",
- "output voltage a I_ZM = 15.70 volt\n",
- "value of R for maximum zener current, no load = 124.57 ohm\n",
- "closest practical value is 130 ohms\n",
- "minimum load resistance = 208.60 ohm"
- ]
- }
- ],
- "prompt_number": 8
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 3.8, Page Number: 96<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "#variable declaration\n",
- "V_p_in=10.0; #Peak input voltage\n",
- "V_th=0.7; #forward biased zener\n",
- "V_Z1=5.1;\n",
- "V_Z2=3.3;\n",
- "\n",
- "V_p_in=20.0;\n",
- "V_Z1=6.2;\n",
- "V_Z2=15.0;\n",
- "\n",
- "#result\n",
- "print('max voltage = %.1f V'%(V_Z1+V_th))\n",
- "print('min voltage = %.1f V'%(-(V_Z2+V_th)))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "max voltage = 6.9 V\n",
- "min voltage = -15.7 V"
- ]
- }
- ],
- "prompt_number": 9
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-06-03 21:20:27 +0000