Interleaved High Step-Up DC-DC Converter Based on Voltage Multiplier Cell and Voltage-Stacking Techniques for Renewable Energy Applications †

Abstract

A novel interleaved high step-up DC-DC converter based on voltage multiplier cell and voltage-stacking techniques is proposed for the power conversion in renewable energy power systems. The circuit configuration incorporates an input-parallel output-series boost converter with coupled inductors, clamp circuits and a voltage multiplier cell stacking on the output side to extend the voltage gain. The converter achieves high voltage conversion ratio without working at extreme large duty ratio. The voltage stresses on the power switches are significantly lower than the output voltage. As a result, the low-voltage-rated metal-oxide-semiconductor field-effect transistors (MOSFETs) can be employed to reduce the conduction losses and higher conversion efficiency can be expected. The interleaved operation reduces the input current ripple. The leakage inductances of the coupled inductors act on mitigating the diode reverse recovery problem. The operating principle, steady-state analysis and design guidelines of the proposed converter are presented in detail. Finally, a 1-kW prototype with 28-V input and 380-V output voltages was implemented and tested. The experimental results are presented to validate the performance of the proposed converter.

A New Three-Level Flying-Capacitor Boost Converter with an Integrated LC2D Output Network for Fuel-Cell Vehicles: Analysis and Design

“…By means of Equations (22) and (23) and the voltage polarities shown in Figures 3 and 4, both L 1 and L 2 are charging when D is less than 0.5, while they are discharging when D is greater than 0.5.…”

“…The main disadvantage of these topologies is the high current flowing through the semiconductor devices due to the capacitor networks, which result in reduced efficiency. Other topologies rely on magnetic coupling to obtain a high-voltage gain [10,14,22,23]. The main drawback of these topologies is the high voltage spikes across the main switches because of the leakage inductance of the magnetic coupling component.…”

Novel Step-Down DC–DC Converters Based on the Inductor–Diode and Inductor–Capacitor–Diode Structures in a Two-Stage Buck Converter

“…Different strategies to step-up the voltage have been studied and proposed in the literature, such as: isolated step-up topologies [17,21,28], coupled-inductor, nonisolated topologies [29][30][31][32][33][34][35], nonisolated topologies with Capacitor-Diode/switch structure [19,[36][37][38], nonisolated topologies with Inductor-Diode/switch [39,40] and nonisolated topologies with Capacitor-Diode/switch and Inductor-Diode/switch structures [41,42]. These structures are known, respectively, as switched-capacitors and switched-inductors.…”

A Soft-Switched DC/DC Converter Using Integrated Dual Half-Bridge with High Voltage Gain and Low Voltage Stress for DC Microgrid Applications

“…However, there is a considerable ripple in the current drawn from the input source, causing the lifespan of systems to be shortened. Paralleled input configuration using coupled inductors have attracted considerable attention lately due to their ability to effectively reduce the input current ripple and enhance the power level by sharing the input current equally among different branches [28][29][30]. Accordingly, the size of magnetic components and the current stress of semiconductor devices can be decreased.…”

“…Half-bridge converter has demonstrated widespread applications for use in high step-up DC/DC converters especially for PV-based microgrid applications owing to its merits, such as simplicity, ease of control, soft-switching operation in terms of zero voltage switching (ZVS) of switches and zero current switching (ZCS) of diodes, and small input filter because of the continuous input current [29][30][31]. Depending on the input voltage and output power, however, the soft-switching performance cannot be achieved for a wide voltage and power range.…”