Abstract
In this paper, a new structure is proposed for a boost dc–dc converter based on the voltage-lift (VL) technique. The main advantages of the proposed converter are its lack of transformer, simple structure, free and low input current ripple, high voltage gain capability by using an input source, suitable voltage stress on semiconductors and lower output capacitance. Herein, the analysis of the proposed converter operating and its elements voltage and current relations in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are presented, and the voltage gain of each operating mode is individually calculated. Additionally, the critical inductance, current stress of switches, calculation of passive components’ values and efficiency are analyzed. In addition, the proposed converter is compared with other studied boost converters in terms of ideal voltage gain in the CCM and the number of active and passive components, maximum voltage stress on semiconductors, and situation of input current ripples. The correctness of the theoretical concepts is examined from the experimental results using the laboratory prototype.
Highlights
A New Transformer-Less StructureThe reduction of fossil fuels, increasing energy demands and increasing air pollution has created demand for energy production in the field of renewable energies such as wind turbines, solar cells and fuel cells
This paper proposes a new high-gain transformer-less structure for a boost dc–dc converter based on the VL technique, such as in [6,19,20,21,22], with a simple structure with suitable voltage stress on semiconductors, free and low input current ripple by using one input voltage source and lower output capacitance
If L1 < LC1 and L2 < LC2 the proposed converter would operates in discontinuous conduction mode (DCM) and the proposed converter operates in conduction mode (CCM) for L1 > LC1 and L2 > LC2
Summary
The reduction of fossil fuels, increasing energy demands and increasing air pollution has created demand for energy production in the field of renewable energies such as wind turbines, solar cells and fuel cells The structure of this kind of energy produces low level dc voltage at output, dc–dc converters are used in the structure of these types of energy resources to achieve different output voltage at the output side for different duty cycle (D) [1,2]. These types of converters are classified into isolated and non-isolated categories. The problem of leakage inductance and its energy are other important drawbacks of these types of converters
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