19-02-2013, 03:11 PM
Implementation of Solar Illumination System with Three-Stage Charging and Dimming Control Function
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Abstract
In this paper, a solar illumination system with
three-stage battery charger and dimming control function is
proposed. The system structure is divided into two parts. One
is three-stage battery charger, which contains PV module,
buck-boost converter, charger-discharger controller and
lead-acid battery. The other is dimming control of LED
module, which contains a 40W LED module, boost converter
and controller. Average-current dimming method is used to
adjust the luminance of LED module and reduced the power
loss of converter. Finally, in this paper, an 80W charger and a
40W LED dimming control is implemented to verify the
feasibility of the proposed system.
INTRODUCTION
Green energy includes solar energy, wind energy, tidal
energy, hydro etc, which is widely used and developed in
recent years. Especially, Taiwan, which possesses
subtropical climate, is very suitable for the development of
solar energy system. The application of solar energy is
more universal in daily now. In general, the solar power
generation and solar illumination system are more popular
for people. With regard to solar illumination system, which
can be built while combined the charger and converter
structure [1]. It can charge the battery during the day, while
lighting the LED module at night. In recent year, many
charge methods have been widely used and discussed [1][2].
For example constant current charging, constant voltage
charging and reflex charging, etc. Reflex charging needs
large input power, constant current charging is easily
overcharge and constant voltage charging is unable to
determine the charge current during initial charge stage. So
there are still some disadvantages and insufficient while use
unique charge method.
Conclusion
In this paper, a solar illumination system with three-stage
charging and damming control is proposed, two converters,
buck-boost converter and boost converter, is implemented
for achieving three-stage charging and dimming control,
respectively. From the experimental results can be seen that
the battery can be charged to full and shorten the charge
time. In addition, using the average current dimming
scheme can effective and fast control the luminance of
LED module. It verifies the feasibility of the proposed
system.