2021 article

Design of a Dual-Loop Controller with Two Voltage- Dependent Current Compensators for an LLC-Based Charger

2021 IEEE 22ND WORKSHOP ON CONTROL AND MODELLING OF POWER ELECTRONICS (COMPEL).

By: U. Pratik n , M. Abdelraziq n, U. Ahluwalia n, Z. Akhmetov n, G. Chenevert n & Z. Pantic n

co-author countries: United States of America πŸ‡ΊπŸ‡Έ
author keywords: LLC converter; Resonant converter; Dual-loop control; Chargers
Source: Web Of Science
Added: June 20, 2022

A two-stage charger (PFC+LLC) is developed for Power Mobility Device (PMD) charging applications (i.e., power wheelchairs). The LLC topology is selected due to its ability to maintain ZVS operation over a wide range of load variations. This paper discusses the challenges of designing a dual-loop controller for an LLC-based charger with a wide operation region. It proposes modifying the inner current loop to maintain stable operation over a wide input and output range-the proposed internal loop control switches intelligently between two current controllers based on the output voltage level. A 300-W prototype is designed and tested with a resistive load. Moreover, simulation and experimental results are compared to validate the robustness and stability of the proposed controller.