Bachelor of Engineering (Hons,) Electronic Engineering UGEA2473 Power Electronics and Drives Laboratory Practical 1 DC-to-DC Converter

Bachelor of Engineering (Hons,) Electronic Engineering
UGEA2473 Power Electronics and Drives

Laboratory Practical 1
DC-to-DC Converter
Objectives: To analyze the performance and parameters of buck converter and boost converter using
theoretical calculation and software simulation.
Software tool:
LTSpice IV software (free download from http://www.linear.com/designtools/software/),
Part A: Buck Converter
Instruction: Construct a buck converter on LTSpice IV. Use a voltage source to generate square
waveforms with amplitude 5V to turn on and off the BJT. Use switching frequency 200kHz. Write down
simulation results to complete Table 1. Write procedures in your report.
Figure 1: Buck converter
Table 1: Buck Converter Results

VS = 3V
VO Theoretical value Simulation value
D VO / VO IL iL ILmax ILmin D VO / VO IL iL ILmax ILmin
2.0V
2.5V
Next, draw the switching waveform, the output load voltage VO and inductor current IL for output voltage
VO=2V as simulated by LTSpice IV.
1
Part B: Boost Converter
Repeat your experiment using a boost converter as in Figure 2. Use switching frequency 200kHz and
amplitude 5V to switch the BJT. Record measurement you have obtained from LTSpice IV and complete
Table 2. Write procedures in you report.
Figure 2: Boost Converter
Table 2: Boost Converter Results

VS = 3V
VO Theoretical value Simulation value
D VO / VO IL iL ILmax ILmin D VO / VO IL iL ILmax ILmin
6.0V
7.0V
Next, draw the switching waveform, output load voltage VO and inductor current IL for output voltage
VO=6V as simulated by LTSpice IV.
Discussion
Compare the simulation results with the theoretical results. Discuss the reasons for the difference in the
theoretical results and the simulation results.
Derive the formula for the buck converter and the boost converter as listed in Appendix below.
Propose a method to minimize the difference between the theoretical results and the experimental results.
2
Conclusion
Summarize the important outcomes you have learned from this laboratory practical.
Appendix
Buck converter
VO  V  VO 
VO  DV S IL  IR  i L   S  DT
R  L 
VO 1 D i L i
 I L,max  I L  I L,min  I L  L
VO 8LCf 2 2 2
Boost converter
V V I VS VS DT
VO  S IL  O O  i L 
1 D VS (1  D) 2 R L
VO D i L iL
 I L,max  I L  I L,min  I L 
VO RCf 2 2
3
RUBRIC FOR ASSESSING LAB REPORTS
1 2 3 4
Beginning or Developing Accomplished Exemplary Score
incomplete
Introduction Very little Some introductory Introduction is Introduction
(5%) background information, but nearly complete, complete and well-
information still missing some missing some written; provides
provided or major points minor points all necessary
information is background
incorrect principles for the
experiment
Experiment Missing several Written in Written in Well-written in
al important paragraph format, paragraph paragraph format,
procedure experimental still missing some format, important all experimental
(10%) details or not important experimental details are
written in experimental details are covered
paragraph format details covered, some
minor details
missing
Results: Figures, graphs, Most figures, All figures, All figures, graphs,
data, tables contain graphs, tables graphs, tables tables are
figures, errors or are poorly OK, some still are correctly correctly drawn,
graphs, constructed, have missing some drawn, but some are numbered and
missing titles, important or have minor contain
tables, etc.
captions or required features problems or titles/captions.
(25%) numbers, units could still be
missing or improved
incorrect, etc.
Discussion Very incomplete or Some of the Almost all of the All important
(30%) incorrect results have been results have trends and data
interpretation of correctly been correctly comparisons have
trends and interpreted and interpreted and been interpreted
comparison of data discussed; partial discussed, only correctly and
indicating a lack of but incomplete minor discussed, good
understanding of understanding of improvements understanding of
results results is still are needed results is
evident conveyed
Conclusion Conclusions Conclusions All important All important
s missing or missing regarding major conclusions conclusions have
(10%) the important points are drawn, have been been clearly
points but many are drawn, could be made, student
misstated, better stated shows good
indicating a lack understanding
of understanding
Spelling, Frequent grammar Occasional Less than 3 All
grammar, and/or spelling grammar/spelling grammar/spellin grammar/spelling
sentence errors, writing style errors, generally g errors, mature, correct and very
structure is rough and readable with readable style well-written
immature some rough spots
(15%)
in writing style
Appearance Sections out of Sections in order, All sections in All sections in
and order, too much contains the order, formatting order, well-
formatting handwritten copy, minimum generally good formatted, very
(5%) sloppy formatting allowable amount but could still be readable
of handwritten improved
copy, formatting is
rough but
readable

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Bachelor of Engineering (Hons,) Electronic Engineering

UGEA2473 Power Electronics and Drives

Part A: Buck Converter

Figure 1: Buck converter

Table 1: Buck Converter Results

Figure 2: Boost Converter

Table 2: Boost Converter Results

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