Abstract
The DC-DC converter is majorly used in several renewable energy applications. It is usually relevant in a hard-switching operating mode at the cost of increasing power losses and declining efficiency. Power losses are comprised of switching losses and conduction losses, which affect the reliability and speed up the aging of the switch. Therefore, soft-switching techniques are inescapable to reduce electromagnetic interference EMI, minimize losses, and enhance power conversion efficiency. Among the sundry techniques of soft-switching, passive snubbers are uncomplicated and vigorous, besides it has been spotlighted as a finer alternative compared to the active snubbers that involve extra switches and an additional control circuit. This paper investigates the power loss of a conventional solar DC-DC static converter designed and controlled through Maximum Power Point Tracking (MPPT). It evaluates the switch's temperature in the hard-switching operating mode. Besides, this paper presents a new research initiative that aims to allow a zero switching and stabilizing the temperature of the switch through a novel approach of design for RLD and RCD snubber cells. This new design allows the switch to achieve soft-switching, by abolishing the voltage stress, minimizing the power losses, and stabilizing the junction temperature. This snubber has a simple structure with a few components and ease of control, which helps to upgrade the power conversion efficiency through controlling the high voltage and current stress in the switch. In this treatise, elements of the snubber are designed and adjusted for maximum reliability through the simulation in OrCAD environment. Furthermore, the effectiveness of the model is approved through experimental results on a 1600 W conventional boost to validate the proposal.
Highlights
In recent years, renewable energy has presented a high development, assignable to the inexhaustible resources, and the lowest environmental effects
This paper presents a new approach to design the snubber cells that provide perfectly a soft-switching, a zero voltage switching turn on, and a zero current switching turn off together for the main switch of the DC-DC converter by using only resonant circuit RCD and RLD
In order to validate the impact of passive snubber on the circuit, a simulation model is proposed in the envi- 10 ronment of Pspice OrCAD, using the same switches ref- 8 erence chosen for the implementation of the Boost converter: the STW45NM50 MOSFET and the BYT30P 6
Summary
Renewable energy has presented a high development, assignable to the inexhaustible resources, and the lowest environmental effects. The converters supplied with renewable energy sources, mainly photovoltaic panel sources, are recognized by their significant low yield. This type of application needs the following design specifications: reduction of EMI, minimization of power losses, and stabilization of junction temperature. These lead to increased efficiency of such converters. To address these problems, soft-switching techniques are incited instead of hard-switching [5], [6] and [7]
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