Abstract :
Abstract – The design, implementation and evaluation of
120Watt dc – dc amplifier for solar cell module applications
are presented. The aim of this study is to amplify a low
output dc voltage from a 80-Watt, 12V solar cell module, and
use the operation principle of chopper amplifier to achieve a
high dc voltage that is enough to charge two - 12V, 60AH
batteries. A 16 pin dual-in-line SG3524 IC is employed in the
design of the system which comprises of astable square wave
oscillator that converts the output dc of photovoltaic module
to square wave ac, and a class B push – pull employing IRFP
250 MOSFET power driver to amplifier the output of the
oscillator and use it to drive the power transformer in the
system. With the help of bridge rectifier, RC filter, and
switching regulator, a stabilized dc output is obtained to
charge the required battery size. Design calculations were
done with the aid of MATLAB R2007a software. The results
of practical laboratory test carried out show that the
oscillator and power amplifier output voltages of 4.5V and
26.0V were achieved respectively. The efficiency of the
oscillator stage is ~51.6% in agreement with the calculated
design efficiency. Also, the measured efficiency of the
amplifier is ~50.0%. The measured output power is
~120.0Watt.
