ABSTRACT
In this paper, a novel high step-up dc/dc converter is presented for
renewable energy applications. The suggested structure consists of a coupled
inductor and two voltage multiplier cells, in order to obtain high step-up
voltage gain. In addition, two capacitors are charged during the switch-off
period, using the energy stored in the coupled inductor which increases the
voltage transfer gain. The energy stored in the leakage inductance is recycled with
the use of a passive clamp circuit. The voltage stress on the main power switch
is also reduced in the proposed topology. Therefore, a main power switch with
low resistance RDS(ON) can be used to reduce the conduction losses. The
operation principle and the steady-state analyses are discussed thoroughly. To
verify the performance of the presented converter, a 300-W laboratory prototype
circuit is implemented. The results validate the theoretical analyses and the
practicability of the presented high step-up converter.
KEYWORDS:
Coupled inductor, DC/DC converters, High step-up, Switched capacitor.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT
DIAGRAM:
Fig. 1.
Circuit configuration of the presented high-step-up converter.
EXPERIMENTAL
RESULTS:
Fig. 2.
Experimental results under load 300 W.
CONCLUSION
This paper
presents a new high-step-up dc/dc converter for renewable energy applications.
The suggested converter is suitable for DG systems based on renewable energy
sources, which require high-step-up voltage transfer gain. The energy stored in
the leakage inductance is recycled to improve the performance of the presented
converter. Furthermore, voltage stress on the main power switch is reduced.
Therefore, a switch with a low on-state resistance can be chosen. The
steady-state operation of the converter has been analyzed in detail. Also, the
boundary condition has been obtained. Finally, a hardware prototype is implemented
which converts the 40-V input voltage into 400-V output voltage. The results
prove the feasibility of the presented converter.
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