{
"metadata": {
"name": "Chapter_3"
},
"nbformat": 2,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"source": [
"<h1>Chapter 3: Special-purpose Diodes<h1>"
]
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.1, Page Number:88<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"%matplotlib inline"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"",
"Welcome to pylab, a matplotlib-based Python environment [backend: module://IPython.zmq.pylab.backend_inline].",
"For more information, type 'help(pylab)'."
]
}
],
"prompt_number": 1
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"delVZ=50*10**-3; #voltage in volts, from graph",
"delIZ=5*10**-3; #current in amperes, from rgraph",
"",
"#calculation",
"ZZ=delVZ/delIZ; #zener impedence",
"",
"# result",
"print \"zener impedance = %d ohm \" %ZZ"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"zener impedance = 10 ohm "
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.2, Page Number:89<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"I_ZT=37*10**-3; #IN AMPERES",
"V_ZT=6.80; #IN VOLTS",
"Z_ZT=3.50; #IN OHMS",
"I_Z=50*10**-3; #IN AMPERES",
"",
"#calculation",
"DEL_I_Z=I_Z-I_ZT; #change current",
"DEL_V_Z=DEL_I_Z*Z_ZT; #change voltage",
"V_Z=V_ZT+DEL_V_Z; #voltage across zener terminals",
"print \"voltage across zener terminals when current is 50 mA = %.3f volts\" %V_Z",
"I_Z=25*10**-3; #IN AMPERES",
"DEL_I_Z=I_Z-I_ZT; #change current",
"DEL_V_Z=DEL_I_Z*Z_ZT; #change voltage",
"V_Z=V_ZT+DEL_V_Z; #voltage across zener terminals",
"",
"#result",
"print \"voltage across zener terminals when current is 25 mA = %.3f volts\" %V_Z"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"voltage across zener terminals when current is 50 mA = 6.845 volts",
"voltage across zener terminals when current is 25 mA = 6.758 volts"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.3, Page Number:90<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"V_Z=8.2; #8.2 volt zener diode",
"TC=0.0005; #Temperature coefficient (per degree celsius)",
"T1=60; #Temperature 1 in celsius",
"T2=25; #Temperature 2 in celsius",
"",
"#calculation",
"DEL_T=T1-T2; #change in temp",
"del_V_Z=V_Z*TC*DEL_T; #change in voltage",
"voltage=V_Z+del_V_Z; #zener voltage",
"",
"#result",
"print \"zener voltage at 60 degree celsius = %.3f volt\" %voltage"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"zener voltage at 60 degree celsius = 8.343 volt"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.4, Page Number:90<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"P_D_max=400*10**-3; #power in watts",
"df=3.2*10**-3 #derating factor in watts per celsius",
"del_T=(90-50); #in celsius, temperature difference",
"",
"#calculation",
"P_D_deru=P_D_max-df*del_T; #power dissipated",
"P_D_der=P_D_deru*1000;",
"",
"#result",
"print \"maximum power dissipated at 90 degree celsius = %d mW\" %P_D_der"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximum power dissipated at 90 degree celsius = 272 mW"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.5, Page Number: 92<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"V_Z=5.1;",
"I_ZT=49*10**-3;",
"I_ZK=1*10**-3;",
"Z_Z=7;",
"R=100;",
"P_D_max=1;",
"",
"#calculation",
"V_out=V_Z-(I_ZT-I_ZK)*Z_Z; #output voltage at I_ZK",
"V_IN_min=I_ZK*R+V_out; #input voltage",
"I_ZM=P_D_max/V_Z; #current",
"V_out=V_Z+(I_ZM-I_ZT)*Z_Z; #output voltage at I_ZM",
"V_IN_max=I_ZM*R+V_out; #max input voltage",
"",
"#result",
"print \"maximum input voltage regulated by zener diode = %.3f volts\" %V_IN_max",
"print \"minimum input voltage regulated by zener diode = %.3f volts\" %V_IN_min"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"maximum input voltage regulated by zener diode = 25.737 volts",
"minimum input voltage regulated by zener diode = 4.864 volts"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.6, Page Number: 93<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"V_Z=12.0; #voltage in volt",
"V_IN=24.0; #ip voltage in volt",
"I_ZK=0.001; #current in ampere",
"I_ZM=0.050; #current in ampere ",
"Z_Z=0; #impedence",
"R=470; #resistance in ohm",
"",
"#calculation",
"#when I_L=0, I_Z is max and is equal to the total circuit current I_T",
"I_T=(V_IN-V_Z)/R; #current",
"I_Z_max=I_T; #max current",
"if I_Z_max<I_ZM : # condition for min currert ",
" I_L_min=0;",
"",
"I_L_max=I_T-I_ZK; #max current",
"R_L_min=V_Z/I_L_max; #min resistance",
"",
"#result",
"print \"minimum value of load resistance = %.2f ohm\" %R_L_min",
"print \"minimum curent = %.3f ampere\" %I_L_min",
"print \"maximum curent = %.3f ampere\" %I_L_max"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"minimum value of load resistance = 489.16 ohm",
"minimum curent = 0.000 ampere",
"maximum curent = 0.025 ampere"
]
}
],
"prompt_number": 7
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.7, Page Number: 94<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"# variable declaration",
"V_IN=24.0; #voltage in volt",
"V_Z=15.0; #voltage in volt",
"I_ZK=0.25*10**-3; #current in ampere",
"I_ZT=17*10**-3; #current in ampere",
"Z_ZT=14.0; #impedence",
"P_D_max=1.0; #max power dissipation",
"",
"#calculation",
"V_out_1=V_Z-(I_ZT-I_ZK)*Z_ZT; #output voltage at I_ZK",
"print \"output voltage at I_ZK = %.2f volt\" %V_out_1",
"I_ZM=P_D_max/V_Z;",
"",
"V_out_2=V_Z+(I_ZM-I_ZT)*Z_ZT; #output voltage at I_ZM",
"print \"output voltage a I_ZM = %.2f volt\" %V_out_2",
"R=(V_IN-V_out_2)/I_ZM; #resistance",
"print \"value of R for maximum zener current, no load = %.2f ohm\" %R",
"print \"closest practical value is 130 ohms\"",
"R=130.0;",
"#for minimum load resistance(max load current) zener current is minimum (I_ZK)",
"I_T=(V_IN-V_out_1)/R; #current",
"I_L=I_T-I_ZK; #current",
"R_L_min=V_out_1/I_L; #minimum load resistance",
"",
"#result",
"print \"minimum load resistance = %.2f ohm\" %R_L_min"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"output voltage at I_ZK = 14.77 volt",
"output voltage a I_ZM = 15.70 volt",
"value of R for maximum zener current, no load = 124.57 ohm",
"closest practical value is 130 ohms",
"minimum load resistance = 208.60 ohm"
]
}
],
"prompt_number": 8
},
{
"cell_type": "markdown",
"source": [
"<h3>Example 3.8, Page Number: 96<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"",
"#variable declaration",
"V_p_in=10.0; #Peak input voltage",
"V_th=0.7; #forward biased zener",
"V_Z1=5.1;",
"V_Z2=3.3;",
"",
"V_p_in=20.0;",
"V_Z1=6.2;",
"V_Z2=15.0;",
"",
"#result",
"print('max voltage = %.1f V'%(V_Z1+V_th))",
"print('min voltage = %.1f V'%(-(V_Z2+V_th)))"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"max voltage = 6.9 V",
"min voltage = -15.7 V"
]
}
],
"prompt_number": 9
}
]
}
]
}