Presenting of the Magnetic Coupling-Based Transformer-Less High Step-Up DC-DC Converter for Renewable Energy Applications

Abstract

This study presents a new high step-up converter based on the voltage multiplier cell and coupled inductor for renewable energy applications such as fuel cell and photovoltaic power systems. This converter achieves a high voltage conversion ratio using a coupled inductor and voltage multiplier cell (VMC). The voltage multiplier cell acts as a passive clamp circuit and reduces the maximum voltage across the power switch. The suggested topology has only one power switch in its structure, which leads to low cost and volume. The other benefits of the proposed structure are low components count, low input current ripple, low voltage stress throughout the semiconductors, high efficiency, zero-current switching (ZCS), and zero-voltage switching (ZVS) of diodes. Besides, due to the soft-switching condition of the diodes, the reverse recovery problem can be decreased. To show the effectiveness of the suggested topology, operation survey, steady-state analysis, and efficiency calculation are provided. Additionally, the comparison study with other similar converters illustrates the superiority of the proposed structure. Finally, an experimental prototype with 150 W rated power, 50 kHz switching frequency, and 24 V input voltage is implemented to prove the mathematical analysis and effectiveness of the proposed DC-DC converter.

Design and implementation of a multi‐port bidirectional converter for electric vehicle applications

“…The voltage over capacitor C 1 is measured 65 V. The calculated value of V C1 is presented in Equation (68), which is obtained V. Based on both mathematical and experimental results, the voltage of C 1 and S 1 is almost equal. The voltage of capacitor C 2 is measured 45 V. This result proves Equation (14). Also, the voltage of capacitor C 3 is obtained 66 V, which is near to its calculated value (Equation 16).…”

“…Furthermore, the input sources of power must be capable of delivering the load both separately and concurrently. 14,15 There are two types of DC-DC converter topologies utilized in HESS: isolated and non-isolated. Isolated topologies, which are presented in Dusmez et al 16 and Malik et al, 17 have included a transformer providing galvanic isolation across inputs and outputs.…”

Low-Stress and Optimum Design of Boost Converter for Renewable Energy Systems

“…During Mode 1 and Mode 3, the peak voltage across switches is identical to the actual voltage of the transformer, which is the reflection of the voltage of the load. The stress can be expressed [ 36 , 37 , 38 , 39 , 40 ] as: …”

Performance improvement of a zero‐voltage switching interleaved high step‐up DC–DC converter with low‐voltage stresses

“…Ever-increasing consumption of fossil fuels results in serious problems such as the global warming, CO 2 emission and shortage of fuels. Challenging these issues directed the engineers to use sustainable and clean sources of energies such as photovoltaic (PV) and fuel cell (FC) whose output voltage is typically around 20-50 V [1,2]. To meet the requirements of the DC link voltage of the inverters tied to a grid and/or AC load, the voltage should be boosted up to 400 to 720 V. As an interesting alternative, the conventional interleaved boost converter (CIBC) has been warmly welcomed to provide the required voltage conversion ratio.…”