Abstract
This article proposes a novel single-input-multi-output (SIMO) converter for photovoltaic (PV) applications. The proposed structure produces multi-outputs with extended n stages. The voltage gain of the proposed topology for each output is enhanced by adding the number of the stage which in turn increases the power. The voltage across the switch is low, so it leads to using a lower RDS (ON) MOSFET. Besides, the peak voltage of the switch and diodes is reduced by enhancing the number of the stage. Thus, the proposed converter’s power loss is reduced. This structure can operate in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) of operations. The proposed structure is capable to achieve maximum power point (MPP) using perturb and observe P&O) technique. To describe the foremost advantages of the proposed converter, comparison results between the recommended topology and other related structures in this field are presented. The dynamic analysis, and the principle of operation for n = 3, 4 stages are introduced. Finally, experimental results in CCM and DCM operations with 50 kHz switching frequency are provided.
Highlights
Multiport step-up converters are extensively used in power electronics
The outputs of this topology are used with different output voltages and controlled by the proper design of the control circuit, which reduces the input current ripple to a certain extent, which reduces the size of the passive elements used in the converter [3, 4]
This topology has a high gain with a low peak voltage of switches using voltage multiplier cells
Summary
Multiport step-up converters are extensively used in power electronics. The main advantages of the multiport converters consist of different output voltages [1, 2]. The losses of the topology are increased and efficiency decreased by increasing inductors and capacitors ESR and increasing ON-state resistance of power MOSFET [12] These suggested topologies can work in ZVS in on-state, and ZCS is the off-state switch. The number of power components has large, which will enhance the volume and the cost These topologies have an influential disadvantage in that high voltage stress might be happening at the power switch due to the existence of a leakage of the coupling inductor. The voltage gain of this structure is higher than the classical step-up topologies This structure is widespread to n stages by adding the number of VMCs. The presented converter uses a voltage multiplier unit which is consists of a capacitor-inductor-diode (C-L-D) to increase the output. The stored energy capacitor Cb will be transferred to capacitors Ca, and C1, C2,..., Cn-1, Co1, Co2,..., Co(n-1) will be discharged in this mode:
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