Maximum Voltage Gain Tracking Algorithm for High-Efficiency of Two-Stage Induction Heating Systems Using Resonant Impedance Estimation

• Published in: IEEE transactions on industrial electronics (1982) Vol. 70; no. 8; pp. 7934 - 7943
• Main Authors: Heo, Kyung-Wook, Jin, Juil, Jung, Jee-Hoon
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Boost power factor correction (PFC); Circuits; Digital signal processors; Diode rectifiers; Efficiency; Estimation; Harmonic distortion; Heating systems; Impedance; impedance estimation; Induction heating; induction heating (IH); maximum voltage gain tracking algorithm; Microprocessors; Power factor; Resonant frequencies; Resonant frequency; series resonant inverter; Switches; Switching; Switching frequency; Tracking; Voltage; Voltage gain; Zero voltage switching
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2022.3225853

A boost power factor correction (PFC) circuit has replaced the diode rectifier to improve its poor power factor performance, low efficiency, and output power limitation for conventional induction heating (IH) applications. Accordingly, many studies have been conducted, but they considered only the efficiency of the boost PFC rather than the entire IH system, or their control and design were complicated. In this article, an algorithm tracking the maximum voltage gain of the resonant network is proposed to improve the entire efficiency of the two-stage IH system based on an exact online resonant frequency estimation. It can make the resonant network operate at the maximum voltage gain point which can improve the efficiency of the series-resonant inverter (SRI) included in the IH system with low circulating current, the minimum switching frequency, and zero voltage switching capability. The proposed algorithm also induces the minimum output voltage of the boost PFC, which can reduce its switching losses and total harmonic distortion. The validity of the proposed algorithm is experimentally verified using a 2.4-kW prototype IH system, including the boost PFC and the IH-SRI controlled by a digital signal processor.