Single-Stage LLC Resonant Converter for Induction Heating System with Improved Power Quality

Author:

Kumar Anand1,Goswami Anik1ORCID,Sadhu Pradip Kumar2,Szymanski Jerzy R.3ORCID

Affiliation:

1. School of Electrical Engineering, Vellore Institute of Technology, Chennai 600127, India

2. Department of Electrical Engineering, Indian Institute of Technology (ISM) Dhanbad, Dhanbad 826004, India

3. Faculty of Transport, Electrical Engineering and Computer Sciences, Department of Electrical Drives and Industrial Electronics, Casimir Pulaski University of Radom, Malczewskiego 29, 26-600 Radom, Poland

Abstract

This paper proposes a single-stage direct AC to high-frequency (HF) AC resonant converter based on LLC configuration for induction heating (IH) systems or HF applications. Unlike conventional converters for IH systems, the proposed topology converts the utility frequency to HF AC in a single stage without using a DC link inductor and capacitors and takes the advantages of LLC configuration. Additionally, it improves the power factor to 0.9–1, lowers the THD (3.2% experimentally), and protects against the high-frequency components. An embedded control scheme was designed to keep the HF current oscillating at a resonant frequency, ensuring zero-voltage switching. The operating principle of the proposed topology was investigated using mathematical equations and equivalent circuits. Finally, it was verified using computer simulation, and an experimental prototype of 1.1 kW was developed to demonstrate the proposed topology’s uniqueness.

Publisher

MDPI AG

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