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{
"metadata": {
"name": "ch_8"
},
"nbformat": 2,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"source": [
"<h1>Chapter 8: Voltage Regulators<h1>"
]
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.1 Page No:362 <h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''Linear Voltage Regulator'''",
"",
"#Variable Declaration:",
"Vo=15.0 #Output voltage in volt",
"Vr=2.0 #Ripple voltage in volt",
"",
"#Calculations:",
"Vimin=Vo+3.0 #Calculating minimum input voltage ",
"",
"Vi=Vimin + Vr/2.0 #Calculating input voltage",
"",
"Vz=Vi/2.0 #Calculating zener voltage",
"",
"Vz=10.0 #Volatge in volt",
"Iz=20.0*10**-3 #Current in ampere",
"",
"R1=(Vi-Vz)/Iz #Calculating resistance value",
" ",
"I2=50.0*10**-6 #Current ampere",
"R2=(Vo-Vz)/I2 #Calculating Resistance value",
"R2=R2/1000.0 #Calculating resistance value",
"",
"R3=Vz/I2 #Calculating resistance value",
"R3=R3/1000.0 #Calculating resistance value",
"",
"Vcemax=Vi+Vr/2 #Calculating volatge",
"",
"IE=50.0*10**-6 #Current in ampere",
"IL=50.0*10**-6 #Current in ampere",
"",
"P=(Vi-Vo)*IL #Calculating power ",
"P1=P*1000000.0 #Calculating power",
"",
"",
"#Results:",
"print('As Vz=%.1f, use Zener diode 1N758 for 10V'%Vz)",
"print('\\nR1= %d ohm'%R1)",
"print('\\nR2= %.1f kohm'%R2)",
"print('\\nR3= %d kohm'%R3)",
"print('\\nSelect C1= 50uF')",
"print('\\nP= %.1f mW'%P1)",
"print('\\nUse the transstor 2N718 for Q1')"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"As Vz=10.0, use Zener diode 1N758 for 10V",
"",
"R1= 450 ohm",
"",
"R2= 100.0 kohm",
"",
"R3= 200 kohm",
"",
"Select C1= 50uF",
"",
"P= 200.0 mW",
"",
"Use the transstor 2N718 for Q1"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.2, Page No: 366<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''7805 Voltage Regulator'''",
"",
"#Variable Declaration:",
"IL=0.25 #Current in ampere",
"Vr=5.0 #Ripple voltage in volt",
"",
"#Calculations:",
"R=Vr/IL #Calculating value of resistance ",
"RL=10.0 #Calculating value of resistance",
"VL=IL*RL #Calculating voltage",
"",
"Vo=Vr+VL #Calculating output voltage",
"Vdrop=2.0 #Voltage drop in volt",
"Vi=Vo+Vdrop #Calculating voltage",
"",
"#Results:",
"print('R= %d ohm'%R)",
"print('\\nVo= %.1f V'%Vo)",
"print('\\nVo= %.1f V'%Vi)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"R= 20 ohm",
"",
"Vo= 7.5 V",
"",
"Vo= 9.5 V"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.3, Page No: 368<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''7805 Regulator Circuit'''",
"",
"#Variable Declaration:",
"VL=5.0 #Voltage in volt",
"RL=100.0 #Resistance in ohm",
"",
"#Calculations:",
"IL=VL/RL #Calculating current ",
"IL1=IL*1000.0 #Calculating current",
"#Part A",
"R1=7.0 #Resistance in ohm ",
"VR1=IL*R1 #Calculaing voltage drop across R1",
"VR1x=VR1*1000.0 #Calculatingvoltage drop across R1",
"",
"#Part B",
"VLb=5.0 #Voltage in volt",
"RLb=2.0 #Resistance in ohm",
"",
"ILb=VLb/RLb #Calculating current",
"",
"R1=7.0 #Resistance in ohm ",
"VR1=ILb*R1 #Calculating voltage drop accross R1",
"",
"Io=0.147 #Current in ampere ",
"Ic=ILb-Io #Calculating current",
"",
"#Results:",
"print('Part A')",
"print('\\nLoad Current IL= %d mA'% IL1)",
"print('\\nVoltage accross R1= %d mV'%VR1x)",
"print('\\nAs voltage < 0.7V, Q1 is OFF')",
"print('\\nHence IL=Io=Ii=50 mA')",
"print('\\n\\nPart B')",
"print('\\nLoad Current IL= %.1f A'%ILb)",
"print('\\nVoltage accross R1= %.1f V'%VR1)",
"print('\\nAs voltage > 0.7V, Q1 is ON')",
"print('\\nHence Ic= %.3f A'%Ic)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Part A",
"",
"Load Current IL= 50 mA",
"",
"Voltage accross R1= 350 mV",
"",
"As voltage < 0.7V, Q1 is OFF",
"",
"Hence IL=Io=Ii=50 mA",
"",
"",
"Part B",
"",
"Load Current IL= 2.5 A",
"",
"Voltage accross R1= 17.5 V",
"",
"As voltage > 0.7V, Q1 is ON",
"",
"Hence Ic= 2.353 A"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.4, Page No: 371<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''LM317 Regulator'''",
"",
"#Variable Declaration:",
"R1=240.0 #Resistance in ohm",
"R2=2000.0 #Resistance in ohm",
"Iadj=50.0*10**-6 #Current in ampere",
"Vref=1.25 #Reference voltage in volt ",
"",
"#Calculation:",
"Vo=(Vref*(1+R2/R1))+(Iadj*R2) #Calculating output voltage",
"",
"#Result:",
"print('Vo= %.2f V'%Vo)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Vo= 11.77 V"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.5, Page NO:371<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''Voltage regulator using LM317'''",
"",
"#Variable Declaration:",
"Iadjmax=100.0*10**-6 #Current in ampere",
"R1=240.0 #Resistance in ohm",
"Vref=1.25 #Reference voltage in volt ",
" ",
"#Calculations:",
"#First case: Vo=4",
"Vo=4.0 #Voltage in volt",
"R2a1=(Vo-Vref)/(Vref/R1 + Iadjmax) #Calculating value of resistance",
"R2a=R2a1/1000.0 #Calculating value of resistance",
"",
"#First case: Vo=12",
"Vo=12.0 #Voltage in volt",
"R2b1=(Vo-Vref)/(Vref/R1 + Iadjmax) #Calculating value of resistance",
"R2b=R2b1/1000.0 #Calculating value of resistance",
"",
"#Results:",
"print('\\nR2= %.2f kohm'%R2a)",
"print('\\nR2= %.2f kohm'%R2b)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"",
"R2= 0.52 kohm",
"",
"R2= 2.03 kohm"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No.8.6, Page No: 377<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''Current Limiting Circuit'''",
"",
"#Variable Declaration:",
"ILmax=0.5 #Current in ampere",
"",
"#Calculations:",
"#Part 1",
"Rsc=0.7/ILmax #Calculting value of resistance",
"",
"#Part 2",
"RL=100.0 #Resistance in ohm",
"Vo=20.0 #Voltage in volt",
"",
"IL1=Vo/RL #Calculating current",
"",
"#Part 3",
"RLn=10.0 #Resistance in ohm",
"",
"IL2=Vo/RLn #Calculating current",
"Von=RLn*ILmax #Calculating voltage",
"",
"#Results:",
"print('Rsc= %.1f ohm'%Rsc)",
"print('\\nIL= %.1f A'%IL1)",
"print('\\nIL= %.1f A'%IL2)",
"print('\\nSince IL > ILmax of 0.5A, current limiting will happen')",
"print('\\nVo= %.1f V'%Von)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Rsc= 1.4 ohm",
"",
"IL= 0.2 A",
"",
"IL= 2.0 A",
"",
"Since IL > ILmax of 0.5A, current limiting will happen",
"",
"Vo= 5.0 V"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No. 8.7, Page No: 378<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"''' LM723 Regulator'''",
"",
"#Variable Declaration:",
"R2=10000.0 #Resistance in ohm ",
"Vo=12.0 #Output voltage in volt",
"Vref=7.15 #Reference voltage",
"",
"#Calculations:",
"R1=(Vo/Vref)*R2 - R2 #Calculating resistance value",
"R1a=R1/1000.0 #Calculating resistance value",
"",
"#Result:",
"print('\\nR1= %.2f kohm'%R1a)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"",
"R1= 6.78 kohm"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"source": [
"<h3>Example No.8.8, Page NO: 380<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"'''Continuously adjustable power supply'''",
"",
"#Variable Declaration:",
"Vref=7.15 #Reference voltage in volt",
"Vo=5.0 #Output voltage in volt",
"",
"#Calculations:",
"k=Vref/Vo ",
"k1=k-1",
"",
"#For min voltage of 2V",
"Vom=2.0 ",
"km=Vref/Vom",
"km1=km-1.43",
"",
"R1a=10000.0 #Resistance in ohm",
"R1b=2000.0 #Resistance in ohm",
" ",
"R2=R1a/2.145 #Calculating resistance value",
"R2n=R2/1000.0 #Calculating resistance value",
"",
"R1=6000.0 #Resistance in ohm",
"R3=(R1*R2)/(R1+R2) #Calculating resistance value",
"R3n=R3/1000.0 #Calculating resistance value",
"",
"#Results:",
"print('(R1b+R2)/R2= %.2f'%k)",
"print('\\nR1 = %.2f * R2'%k1)",
"print('\\n(R1a+R1b+R2)/R2= %.3f'%km)",
"print('\\nR1a = %.3f * R2'%km1)",
"print('\\nR2= %.2f kohm'%R2n)",
"print('\\nR3= %.2f kohm'%R3n)"
],
"language": "python",
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(R1b+R2)/R2= 1.43",
"",
"R1 = 0.43 * R2",
"",
"(R1a+R1b+R2)/R2= 3.575",
"",
"R1a = 2.145 * R2",
"",
"R2= 4.66 kohm",
"",
"R3= 2.62 kohm"
]
}
],
"prompt_number": 4
},
{
"cell_type": "code",
"collapsed": true,
"input": [],
"language": "python",
"outputs": []
}
]
}
]
}
|
