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Implementation of Bang-Bang Charge Control for an LLC Resonant Converter for Battery Charger
Author(s)
Date Issued
January 1, 2025
Type
Conference Paper
Abstract
This paper presents the design of a 2-kW full-bridge LLC resonant converter for battery charger operating in a range of DC input voltages of 380-420 V and output voltage of 60 V. The bang-bang charge control technique, whose controller adjusts the threshold voltage of the bang-bang comparators, is adopted for controlling the converter switching frequency. This control method provides fast single-pole control-to-output transfer function resulting in simplicity of controller design. In this paper the design procedure of LLC converter resonant circuit is presented and a prototype is built. The discrete-time PI compensator for constant voltage (CV) and constant current (CC) control is implemented using STM32 microcontroller. The simulation and experimental results show satisfactory control characteristics.
Citation
2025 7th International Conference on Power Energy and Innovations Icpei 2025 Proceedings, 2025