A High Gain Switched Z-Source Converter with Reduced Passive Components

Authors

  • Rahul Kumar , Ramani Kannan , Nursyarizal Bin Mohd Nor

Abstract

Pollution problems have contributed to more research on renewable energy sources. Owing
to the lower output of renewable energy sources, DC-DC boost converters are required to step-up
this lower voltage to a higher value before connecting it to the real applications e.g. DC microgrid,
DC motor, inverter, etc. Since traditional Z-source DC-DC converters have the capability to enhance
the output voltage of renewable energy sources. However, these designs suffer from the limitation of
voltage gain and utilize higher passive components, which makes them bulky and expensive. This
paper presents, a new topology of the switched Z-source boost converter, which exhibits the features
of higher boost factor at a lower duty cycle and reduces the risk of inductor saturation. The higher
boost factor is obtained by employing one inductor and switch at the load side of the traditional Zsource DC-DC converter. This allows the output capacitor to be utilized during charging and
discharging loops. The proposed design has achieved a boost factor of 4.36 at D=0.15, which is
higher than the traditional Z-source converter e.g. 1.21 at the similar duty cycle. Furthermore, in
comparison with conventional converters, the proposed converter deploys reduced number of passive
components, thus reducing the cost and enhancing efficiency. Additionally, comparison based on
boost ability and number of components has been presented. Finally, simulations are carried through
MATLAB/Simulink software and the simulated results verified the correctness of the proposed
converter.

Published

2020-10-23

Issue

Section

Articles