diff options
Diffstat (limited to 'Introduction_to_Power_Electronics_by_V._Jagannathan/chapter5.ipynb')
| -rw-r--r-- | Introduction_to_Power_Electronics_by_V._Jagannathan/chapter5.ipynb | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/Introduction_to_Power_Electronics_by_V._Jagannathan/chapter5.ipynb b/Introduction_to_Power_Electronics_by_V._Jagannathan/chapter5.ipynb new file mode 100644 index 00000000..4b5039f8 --- /dev/null +++ b/Introduction_to_Power_Electronics_by_V._Jagannathan/chapter5.ipynb @@ -0,0 +1,210 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Chapter 5 - DC to DC Converters (Choppers)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Ex 5.1 page 184" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Average load current = 9.2 A\n", + "\n", + " Power delivered = 2116.00 W\n" + ] + } + ], + "source": [ + "from __future__ import division\n", + "from math import sqrt\n", + "R=10 # ohm\n", + "Vs=230 # V\n", + "f=1*1000 # Hz\n", + "Ton=0.4 # ms\n", + "k=0.4 # duty cycle\n", + "\n", + "Vo=Vs*k # V\n", + "Ioav=Vo/R # A\n", + "Vor=Vs*sqrt(k) # V\n", + "Po=Vor**2/R # W\n", + "print '\\n Average load current = %.1f A'%( Ioav)\n", + "print '\\n Power delivered = %.2f W'%(Po)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Ex 5.2 page 185" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " duty ratio = 0.667\n", + "\n", + " chopping frequency = 33.33 Hz\n", + "\n", + " Average load voltage = 200.00 V\n", + "\n", + " Average load current = 40.00 A\n" + ] + } + ], + "source": [ + "from __future__ import division\n", + "from math import sqrt\n", + "\n", + "R=5 # ohm\n", + "Vs=300 # V\n", + "f=1*1000 # Hz\n", + "Ton=20 # ms\n", + "Toff=10 # ms\n", + "\n", + "k= Ton/(Ton+Toff) # duty ratio\n", + "f=1000/(Ton+Toff) # Hz\n", + "Voav=Vs*k # V\n", + "Ioav=Voav/R # A\n", + "print '\\n duty ratio = %.3f'%(k)\n", + "print '\\n chopping frequency = %.2f Hz'%(f)\n", + "print '\\n Average load voltage = %.2f V'%( Voav)\n", + "print '\\n Average load current = %.2f A'%( Ioav)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Ex 5.3 page 185" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " chopping frequency = 15 Hz\n" + ] + } + ], + "source": [ + "from __future__ import division\n", + "from math import sqrt\n", + "\n", + "Vs=400 # V\n", + "alfa=0.25 # duty cycle\n", + "delta_I=10 # A\n", + "L=0.5 # H\n", + "R=0 # ohm\n", + "\n", + "Vo=alfa*Vs # V\n", + "#Vo+L*di/dt=Vs -- putting dt=Ton & di=delta_I\n", + "Ton=delta_I/((Vs-Vo)/L)*1000 # ms\n", + "T=Ton/alfa # ms\n", + "f=1/T*1000 # Hz\n", + "print '\\n chopping frequency = %d Hz'%(f)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Ex 5.5 page 186" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Pulse width of output voltage, Ton = 200 us & T = 300 us\n", + "\n", + "New output voltage = 330 V\n" + ] + } + ], + "source": [ + "from __future__ import division\n", + "from math import sqrt\n", + "\n", + "Vs=220 # V\n", + "Vo=660 # V\n", + "Toff=100 # us\n", + "\n", + "#Vo=Vs/(1-alfa)\n", + "alfa=1-Vs/Vo # duty cycle\n", + "#alfa=Ton/(Ton+Toff)\n", + "Ton=alfa*Toff/(1-alfa) # us\n", + "T=Ton+Toff # us\n", + "print 'Pulse width of output voltage, Ton = %d us & T = %d us'%(Ton,T)\n", + "#(ii) reduce pulse width by 50%\n", + "Ton=Ton/2 # us\n", + "Toff=T-Ton # us\n", + "alfa=Ton/(Ton+Toff) # duty cycle\n", + "Vo=Vs/(1-alfa) # V\n", + "print '\\nNew output voltage = %d V'%(Vo)" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.9" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |