Abstract
This paper presents a new structure for non-isolated and non-inverting DC-DC converters with high voltage gain harnessing the fundamentals of the voltage lift technique. The proposed topology is a suitable structure for low voltage applications. The operation principles, the steady-state relations, and different switching strategies to further improve the voltage gain performance of the proposed converter are described. A hybrid utilization of complementary switching approach and simultaneous switching of two switches is proposed to achieve the highest voltage gain in different duty cycles. Furthermore, a theoretical analysis of power losses is provided. The suggested DC-DC converter architecture features high voltage gain, high efficiency, and low stress on semiconductor devices. In order to demonstrate these advantages, the structure is compared with some recently-presented high step-up converters in terms of efficiency, voltage gain, and voltage stress. Moreover, A 200W laboratory prototype is developed with experiments carried out to validate the given theories and feasibility of the proposed converter topology.
Highlights
High step-up DC-DC converters have increasingly attracted attention in recent years, primarily due to their several advantages, making them suitable alternatives to be employed in many critical applications of power electronic converters, such as renewable energy interface systems, DC distribution networks, energy storage systems, electric vehicles, and uninterruptible power supplies (UPS) [1]–[3]
The converter contains three operating modes: Mode III (S1 & S2 : ON): During this mode, which lasts for ton seconds, all diodes are reverse-biased, and L1 and L2 are charged through Vin and C1, respectively
In the current study, a high voltage gain converter based on the voltage-lift technique was proposed and analyzed in the conduction mode (CCM) operating condition
Summary
High step-up DC-DC converters have increasingly attracted attention in recent years, primarily due to their several advantages, making them suitable alternatives to be employed in many critical applications of power electronic converters, such as renewable energy interface systems, DC distribution networks, energy storage systems, electric vehicles, and uninterruptible power supplies (UPS) [1]–[3]. A high voltage gain is achieved by a combination of these elements, considerable complexity, capacitors current stress issue, and poor energy efficiency poses a limitation to their wide applications. These structures are typically used in low power applications, such as energy harvesting and in-chip design of integrated circuits (IC) [21]. CONFIGURATION, OPERATION PRINCIPLES, AND STEADY-STATE ANALYSIS OF THE PROPOSED CONVERTER The operation of the VL technique is based on energy transmission between inductors and capacitors, which are the storage elements of the converter. Operation modes, steady-state relations, and different switching states are analyzed
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