Development of Smart Lead-Acid Battery Charger for Electric Vehicle Application
The battery charger is a critical part in an electric vehicle (EV) because it charges the battery, which is the weakest part of it. An unduly long charging time limits the use of the EV. Currently, it takes a long time to charge a battery of limited capacity, making EVs rather impractical to use....
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10304/1/FK_1999_25_A.pdf |
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| Summary: | The battery charger is a critical part in an electric vehicle (EV) because it
charges the battery, which is the weakest part of it. An unduly long charging time
limits the use of the EV. Currently, it takes a long time to charge a battery of
limited capacity, making EVs rather impractical to use.
The objective of this thesis is to design, simulate, construct and test a smart
charger for fast charging a battery. The charger consists of two units - the power
processing unit and the battery management unit. The power processor is based on
a step-down DC-to-DC converter topology. The battery management unit uses
first a current control (constant current mode) and then voltage control (constant
voltage mode) to charge the battery. The smart control mechanism is based on current and voltage sensing
combined with sequenced average current and voltage control to charge the battery
as fast as possible and to maximise its charge.
The charger was tested successfully on single-phase and three-phase
voltage supplies at different output voltages and currents. The charger developed
was able to charge a 30 Ah lead-acid battery in two hours as opposed to six hours
using a conventional charger.
The research showed that it was possible to develop a battery charger
which can charge a battery to its limits quickly without gassing and overheating. It
is likely that the battery life will be extended without the detrimental effects
experienced. |
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