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-{
- "metadata": {
- "name": ""
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "CHAPTER 15 Thyristors"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-1, Page 521"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "VB=10 #breakover voltage(V)\n",
- "Vin=15 #input voltage(V)\n",
- "R=100.0 #resistance (Ohm)\n",
- "\n",
- "I1=1000*Vin/R #diode current ideally(mA)\n",
- "I2=1000*(Vin-0.7)/R #diode current with second approx.(mA)\n",
- "I3=1000*(Vin-0.9)/R #diode current more accurately(mA)\n",
- "\n",
- "print 'Diode current ideally ID1 = ',I1,'mA'\n",
- "print 'Diode current with second approx. ID2 = ',I2,'mA'\n",
- "print 'Diode current more accurately ID3 = ',I3,'mA'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Diode current ideally ID1 = 150.0 mA\n",
- "Diode current with second approx. ID2 = 143.0 mA\n",
- "Diode current more accurately ID3 = 141.0 mA\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-2, Page 525"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "Ih=4*10**-3 #holding current(mA)\n",
- "R=100.0 #resistance (Ohm)\n",
- "Vs=15 #input voltage (V)\n",
- "\n",
- "Vin=0.7+(Ih*R) #new input voltage(V)\n",
- "\n",
- "print 'New input voltage Vin = ',Vin,'V'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "New input voltage Vin = 1.1 V\n"
- ]
- }
- ],
- "prompt_number": 7
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-3, Page 525"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "R=2.0*10**3 #resistance (Ohm)\n",
- "C=0.02*10**-6 #capacitance (F)\n",
- "VB=10 #breakdown voltage(V)\n",
- "\n",
- "RC=R*C #Time constant(s)\n",
- "T=0.2*RC #period (s)\n",
- "f=T**-1 #frequency(Hz) \n",
- "\n",
- "print 'time constant RC = ',RC*10**6,'us'\n",
- "print 'Period T = ',T*10**6,'us'\n",
- "print 'Frequency = ',f/1000,'KHz'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "time constant RC = 40.0 us\n",
- "Period T = 8.0 us\n",
- "Frequency = 125.0 KHz\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-4, Page 531"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "It=7*10**-3 #trigger current(mA)\n",
- "R1=100.0 #resistance (Ohm)\n",
- "R2=1*10**3 #resistance (Ohm)\n",
- "Vt=0.75 #trigger voltage (V)\n",
- "Ih=6*10**-3 #holding current(mA)\n",
- "\n",
- "Vin=Vt+(It*R2) #minimum input voltage(V)\n",
- "VCC=0.7+(Ih*R1) #supply voltage for turning of SCR(V)\n",
- "\n",
- "print 'Minimum input voltage Vin = ',Vin,'V'\n",
- "print 'supply voltage for turning of SCR VCC = ',VCC,'V'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Minimum input voltage Vin = 7.75 V\n",
- "supply voltage for turning of SCR VCC = 1.3 V\n"
- ]
- }
- ],
- "prompt_number": 11
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-5, Page 532"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "IGT=200*10**-6 #trigger current(mA)\n",
- "VGT=1 #trigger voltage(V) \n",
- "R1=900.0 #resistance (Ohm)\n",
- "R2=100.0 #resistance (Ohm)\n",
- "C=0.2*10**-6 #capacitance (F)\n",
- "Vt=0.75 #trigger voltage (V)\n",
- "Ih=6*10**-3 #holding current(mA)\n",
- "R=1*10**3 #Resistance (Ohm) \n",
- "\n",
- "RTH=R1*R2/(R1+R2) #Thevenin resistance (Ohm)\n",
- "Vin=VGT+(IGT*RTH) #input voltage needed to trigger(V)\n",
- "Vp=10*Vin #Output voltage at SCR firing point(V)\n",
- "RC=C*(R/2) #time constant (s)\n",
- "T=RC*0.2 #period (s)\n",
- "f=1/T #frequency (Hz)\n",
- "\n",
- "print 'peak output voltage Vpeak = ',Vp,'V'\n",
- "print 'time constant RC = ',RC*10**6,'us'\n",
- "print 'Period T = ',T*10**6,'us'\n",
- "print 'Frequency = ',f/1000,'KHz'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "peak output voltage Vpeak = 10.18 V\n",
- "time constant RC = 100.0 us\n",
- "Period T = 20.0 us\n",
- "Frequency = 50.0 KHz\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-6, Page 536"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "Vz=5.6 #breakdown voltage(V)\n",
- "VGT1=0.75 #trigger voltage (V) \n",
- "VGT2=1.5 #worst case maximum trigger voltage(V) \n",
- "Vz2=6.16 #break down voltage with 10% tolerance (V)\n",
- "\n",
- "VCC1=Vz+VGT1 #supply voltage(V) \n",
- "VCC2=VGT2+Vz2 #Over voltage (V)\n",
- "\n",
- "print 'supply voltage VCC1 = ',VCC1,'V'\n",
- "print 'supply over voltage VCC2 = ',VCC2,'V'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "supply voltage VCC1 = 6.35 V\n",
- "supply over voltage VCC2 = 7.66 V\n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-7, Page 539"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "import math # This will import math module\n",
- "\n",
- "C=0.1*10**-6 #capacitance (F)\n",
- "f=60 #frequency (Hz)\n",
- "R=26*10**3 #resistance(KOhm)\n",
- "Vm=120 #input ac voltage(V)\n",
- "\n",
- "XC=(2*math.pi*f*C)**-1 #capacitive reactance(Ohm)\n",
- "ZT=((R**2)+(XC**2))**0.5 #impedance (Ohm)\n",
- "thetaz=math.atan2(-XC,R)*180/math.pi #angle (deg)\n",
- "IC=Vm/ZT #Current through C(A)\n",
- "VC=IC*XC #voltage across C(V)\n",
- "thetac=180+thetaz #conduction angle(deg)\n",
- "\n",
- "print 'Capacitor reactance XC = ',round((XC/1000),2),'KOhm'\n",
- "print 'impedance ZT = ',round((ZT/1000),2),'KOhm'\n",
- "print 'firing angle = ',round(thetaz,2),'deg'\n",
- "print 'Current through C, IC = ',round((IC*1000),2),'mA'\n",
- "print 'voltage across C, VC = ',round(VC,2),'V'\n",
- "print 'conduction angle = ',round(thetac,2),'deg'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Capacitor reactance XC = 26.53 KOhm\n",
- "impedance ZT = 37.14 KOhm\n",
- "firing angle = -45.57 deg\n",
- "Current through C, IC = 3.23 mA\n",
- "voltage across C, VC = 85.7 V\n",
- "conduction angle = 134.43 deg\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-8, Page 546"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "C=1*10**-6 #capacitance (F)\n",
- "R1=22.0 #resistance (Ohm)\n",
- "R2=82*10**3 #resistance(KOhm)\n",
- "Vs=75 #input voltage(V)\n",
- "\n",
- "I=Vs/R1 #current through 22Ohm resistor (A)\n",
- "\n",
- "print 'current through 22Ohm resistor I = ',round(I,2),'A'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "current through 22Ohm resistor I = 3.41 A\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 15-9, Page 547"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "Vdb=32.0 #diac break down voltage (V)\n",
- "VTT=1 #triac trigger voltage(V)\n",
- "\n",
- "Vin=VTT+Vdb #input voltage for triggering triac\n",
- "\n",
- "print 'input voltage for triggering triac vin = ',Vin,'V'"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "input voltage for triggering triac vin = 33.0 V\n"
- ]
- }
- ],
- "prompt_number": 27
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-01-09 13:31:22 +0000