by Chanwoo Kwon
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Reliable operation in harsh environments
Virtually maintenance free
Tailored solutions
Competitively priced
Exceptional efficiency
Compact design
Extended operating life
Environmentally safe
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Lead Acid Battery
Ultracapacitor
Specific Energy Density
(wh/kg)
10-100
1-10
Specific Power Density
(w/kg)
<1000
<10,000
Cycle Life
1,000
>500,000
Charge/Discharge
Efficiency
70-85%
85-98%
Fast Charge Time
1-5hr
0.3¬30sec
Discharge Time
0.3-3hr
0.3¬30sec
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Review of Ultrcapacitors
◦ Physical construction and operation of
ultrcapacitors
◦ Application of ultracapacitors in energy storage
for automotives and renewable energy sytems
◦ Electrical characteristics and equivalent circuits of
ultracapacitors
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DC-DC Converter
◦ Select and design a dc-dc converter to charge the
ultrcapacitor from a small 12 V battery (size the
battery for the application)
◦ Select a dc motor with high starting current for
the application
◦ Simulate the converter in PSICE
◦ Use MATLAB/Simulink to model the complete
system
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Demonstrate the application with the
battery, ultracapacitor, dc-dc converter and
motor
◦ Identify the parameters that would be important
in optimising the overall system
◦ Build and test the complete system