Work

A Mutual Inductance–Capacitance IPOS-Type Self-Balancing LLC Resonant Converter

Year: 2026

Type: article

Abstract: In low-voltage-input, high-voltage-output applications, the input-parallel output-series (IPOS) LLC resonant converter experiences voltage and current imbalances due to parameter mismatches in resonant tank components. To address this issue, a self-balancing IPOS LLC resonant converter based on a shared inductance–capacitance (shared L-C) network is proposed. This topology achieves passive voltage and current self-equalization with an interconnection network of resonant inductors and capacitors between modules that does not need additional active components or complex control strategies. An analytical model based on the fundamental harmonic approximation (FHA) is developed to quantitatively assess the balancing performance, and a comparison is made with traditional structures and IPOS structures with only shared inductance. A 1.25 kW two-phase LLC resonant converter prototype is built for experimental validation. The results demonstrate that the balancing errors of the traditional structure and the shared inductance structure reach up to 25.43% and 17.63%, respectively, whereas the proposed structure significantly reduces the balancing error to only 0.43%. This study confirms that this structure provides a simple and reliable solution for voltage and current equalization in high-gain DC–DC conversion systems.

Source: Energies

DOI: 10.3390/en19071731

Authors: Jin Li, Ao Liu, Weiyi Tang

Institution: Shanghai University of Electric Power

Language: English

Topic: Advanced DC-DC Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,137