A Novel Dual Integrated LLC Resonant Converter Using Various Switching Patterns for a Wide Output Voltage Range Battery Charger

Abstract

This paper proposes a novel dual integrated LLC resonant converter (DI-LRC) with a wide output voltage range using various switching patterns. The primary side of the proposed DI-LLC converter consists of two resonant tanks and six switches, while the secondary side consists of a six-pulse diode rectifier. Depending on the switching pattern of the primary switch, the DI-LRC converter is performed by single full-bridge operation with a voltage gain of 1, series-connected full-bridge operation with a voltage gain of 0.5, series-connected half bridge operation with a voltage gain of 0.25, and parallel-connected full-bridge operation with a voltage gain of 2. Accordingly, the proposed DI-LRC converter has four voltage gain curves with different variations and achieves a wider output voltage range than the conventional single voltage gain curve in a given operating frequency range. In this paper, the equivalent circuits derived for each switching pattern are proposed to analyze the operating characteristics of the proposed converter according to each switching pattern, and each Q factor and voltage gain are calculated based on the analyzed equivalent circuit. The performance of the proposed converter and switching pattern is verified using the simulation and experimental results of the prototype battery charger, which is designed to be 4-kW class.

Application-Oriented Review of the LLC-Based Resonant Converters

“…Another design [ 79 ] , incorporates two resonant networks and transformers, along with a three-leg rectifier network. By using three switches in each leg, this topology reduces voltage stress on the switches to handle high-power values.…”

Control Methods for Performance Improvement of an Integrated On-Board Battery Charger in Hybrid Electric Vehicles

“…Recently, from the point of view of the entire battery charge system, interest in the issue of the battery management system (BMS) has increased. The purpose of the BMS is to manage the battery and various functions for the BMS, which are classified as real-time monitoring, calculation and prediction, protection, and optimization, which are under development to improve reliability and safety of battery charging [16][17][18][19][20][21].…”