Abstract
This paper introduces three topologies of a non-isolated high gain step-up Cuk converter based on a switched-inductor (SL) and switched-capacitor (SC) techniques for renewable energy applications, such as photovoltaic and fuel cells. These kinds of Cuk converters provide a negative-to-positive step-up dc–dc voltage conversion. The proposed three topologies SLSC Cuk converters increase the voltage boost ability significantly using the switched-inductor and switched-capacitor techniques compared with the classical Cuk and boost converters. The proposed Cuk converters are derived from the classical Cuk converter by replacing the single inductor at the input and output sides with a SL and the transferring energy capacitor by a SC. The main advantages of the proposed SLSC Cuk converters are achieving a high voltage conversion ratio and reducing the voltage stress across the main switch. Therefore, a switch with low voltage rating and thus, of low RDS-ON can be used, and that leads to a higher efficiency. For example, the third topology have the ability to boost the input voltage up to 13 times when D = 0.75, D is the duty cycle. The voltage gain and the voltage stress across the main switch in the three topologies have been compared with the classical Cuk and boost converter. The proposed three topologies avoid using a transformer, coupled inductors, or extreme duty cycles leading to less volume, loss, and cost. The proposed SLSC Cuk converters are analyzed in continuous conduction mode (CCM), and they have been designed for 12 V input supply voltage, 100 W rated power, 50 kHz switching frequency, and 75% duty cycle. A detailed theoretical analysis of the CCM is represented and all the equations have been derived and matched with the results. The proposed three topologies SLSC Cuk converters have been simulated in MATLAB/SIMULINK and results are discussed.
Highlights
Various dc–dc converter topologies include isolated converters and non-isolated converters have been developed to achieve a high voltage gain without an extremely high duty cycle
Provide a non-isolated negative to positive voltage path with respect to a common ground; higher voltage conversion ratios than the classical Cuk and boost converter due to the SL and SC techniques; lower voltage stress across the main switch than the classical Cuk and boost converter, a switch with low voltage rating and low R DS−ON can be used; according to the topology, number of diodes, one capacitor, and one or three inductors have been added to the main Cuk converter to perform the SL and SC in order to increase the voltage gain; use of a single switch;
This study has successfully developed three topologies of Cuk converters with high voltage gain and reduced active switch stress
Summary
Various dc–dc converter topologies include isolated converters and non-isolated converters have been developed to achieve a high voltage gain without an extremely high duty cycle. Provide a non-isolated negative to positive voltage path with respect to a common ground; higher voltage conversion ratios than the classical Cuk and boost converter due to the SL and SC techniques; lower voltage stress across the main switch than the classical Cuk and boost converter, a switch with low voltage rating and low R DS−ON can be used; according to the topology, number of diodes, one capacitor, and one or three inductors have been added to the main Cuk converter to perform the SL and SC in order to increase the voltage gain; use of a single switch; the main advantage of the classical Cuk converter which is having continuous current in the input and output sides due to the input and output inductors have been kept when designing the proposed topologies.
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