Ujjwal Pratik, Muhammad Abdelraziq, Urvi Ahluwalia, Zhansen Akhmetov, Gabriel Chenevert, Zeljko Pantic
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Design of a Dual-Loop Controller with Two Voltage-Dependent Current Compensators for an LLC-Based Charger.
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.
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