Yohanes Leonaldo Sinaga, Muhammad Daffa Pratama, Dziki Early Al Husni, Alberto Noris Simanjuntak, Erlangga Satrio Jati, Rizky Ajie Aprilianto, Rizki Mendung Ariefianto

Novelty Half-Bridge LLC Resonant Converter with Magnetizing Inductance and Hybrid Rectifier

Introduction

Novelty half-bridge llc resonant converter with magnetizing inductance and hybrid rectifier. Discover NHB-LLCRC-MIHR, a novel half-bridge LLC resonant converter with magnetizing inductance and a hybrid rectifier. Achieve stable output voltage, low ripple, and high efficiency for demanding industrial high-power supply applications.

Abstract

Half-Bridge LLC Resonant converters are widely used in high-power supply applications due to their high efficiency and ability to operate at high frequencies. However, under hold-up conditions or during large fluctuations in input voltage, conventional topologies often experience reduced output stability and increased losses. Therefore, a method that can maintain efficiency and output voltage stability without excessively broadening the switching frequency range is required. To address this, this study proposes a Novelty Half-Bridge LLC Resonant Converter with Magnetizing Inductor and Hybrid Rectifier (NHB-LLCRC-MIHR), incorporating a magnetizing inductor (Lm) in the primary path and a MOSFET-based hybrid rectifier on the secondary side. The research methodology was conducted using MATLAB/Simulink simulation, focusing on five main areas, including optimal switching frequency conditions, operating thresholds, DC conversion ratio (Vo/Vs), comparison of output voltage with conventional topologies, and analysis of output voltage ripple. Simulation results demonstrate that NHB-LLCRC-MIHR can maintain a more stable output voltage, lower ripple, and increase efficiency compared to conventional converters. Thus, this topology shows significant potential for industrial applications that demand high efficiency and optimal power stability.

Review

The paper introduces a novel Half-Bridge LLC Resonant Converter, termed NHB-LLCRC-MIHR, designed to address critical limitations of conventional LLC converters, particularly under challenging hold-up conditions or significant input voltage fluctuations. The authors identify a common problem where existing topologies suffer from reduced output stability and increased losses, necessitating a solution that maintains efficiency and voltage stability without excessively expanding the switching frequency range. The proposed solution integrates a magnetizing inductor (Lm) into the primary path and a MOSFET-based hybrid rectifier on the secondary side, aiming to enhance the converter's performance in these demanding scenarios. The research methodology employed MATLAB/Simulink simulation to thoroughly evaluate the proposed NHB-LLCRC-MIHR topology. The study systematically investigated key performance indicators, including optimal switching frequency conditions, operating thresholds, and the DC conversion ratio (Vo/Vs). Furthermore, the authors conducted a comparative analysis of the output voltage against conventional topologies and meticulously analyzed the output voltage ripple. The simulation results consistently demonstrate that the NHB-LLCRC-MIHR successfully maintains a more stable output voltage, achieves lower ripple, and exhibits increased efficiency when compared to conventional converter designs, thereby fulfilling the initial objectives. Overall, this paper presents a compelling and innovative approach to improving the resilience and performance of Half-Bridge LLC resonant converters. The structural modifications, particularly the inclusion of the magnetizing inductor and the hybrid rectifier, appear to be effective in mitigating the identified challenges. The simulation-based evidence strongly suggests that the NHB-LLCRC-MIHR topology holds significant potential for industrial applications where high efficiency and optimal power stability are paramount. Future work could benefit from experimental validation to further substantiate these promising simulation results and explore its practical implementation nuances.

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