Abstract
High gain dc-dc converters are used in several applications which include solar photovoltaic system, switch-mode power supplies and fuel cells. In this paper, an ultra-high gain dc-dc boost converter is proposed and analyzed in detail. The converter has a gain of six times as compared with the boost converter. The high gain is achieved by utilizing switched inductors and switched capacitors. A modified voltage multiplier cell (VMC) with switched inductors is proposed. The converter has a single switch which makes its operation easy. Moreover, the voltage across the switch, diodes and capacitors are less than the output voltage which increases the overall efficiency of the converter. The converter performance in steady-state is analyzed in detail and it is compared with other latest high gain converters. The working of the converter in non-ideal conditions is also discussed in detail. The loss analysis is done using PLECS software by incorporating the real models of switches and diodes from the datasheet. To confirm and validate the working of the proposed converter a hardware prototype of 200 W is developed in the laboratory. The converter achieves high gain at low duty ratios and its performance is found to be good in open and closed loop conditions.
Highlights
Power electronics play an important role to extract maximum energy from renewable and clean energy sources
High gain dc-dc converters act as a medium between the load and the source and boost the low voltage(12V-60V) generated by the battery, solar photovoltaic (PV) and fuel cell to high DC voltage(200-300V)
High gain converters are nowadays used in level three fast charging of electric vehicle (EV)
Summary
Power electronics play an important role to extract maximum energy from renewable and clean energy sources. In this interval, the switch is turned ON and the diodes D2, D3, D5 and D7 are forward biased. The voltage across inductors L1 and L2 is equal to the input voltage (Vin) by which they are magnetized and inductor currents IL1 and IL2 increase linearly In this mode, Capacitor C1 discharges and transfer its energy through capacitor C5 and load. Current passing through capacitors relations can be shown as follows:
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