Ultra-efficient localized induction heating by dual-ferrite synchronous magnetic field focusing

Peng Cui, Wenbo Zhu, Haosong Li, Shaowei Hu, Bo Hu, Fan Yang, Chunjin Hang and Mingyu Li

Applied Energy, 2023, vol. 348, issue C, No S0306261923008991

Abstract: Induction heating is widely used in aviation, communication, and new energy fields due to its advantages of non-contact, high-power, and controllable heating depth. However, it is still challenging to achieve high energy utilization efficiency of traditional induction heating, mainly due to the magnetic dispersion effect. Herein, a dual-ferrite synchronous focused (DFSF) induction heating method is first proposed by simultaneously placing ferrites inside and outside the induction coil. Meanwhile, an electromagnetic-thermal coupling numerical model was also built to predict the magnetic and temperature fields around the DFSF induction heating system. A conventional induction heating head and two DFSF induction heating heads (cone-type DFSF head and pot-type DFSF head) are compared on soldering the high-power devices. The results show a significant enhancement in magnetic flux density (MFD) with the pot-type DFSF head, exhibiting a remarkable 12-fold increase from 0.02 T to 0.24 T compared to the conventional induction head. Additionally, the pot-type DFSF head generates a substantial 22.3-fold surge in energy within the solder joint, escalating from 0.6 J to 13.4 J, surpassing the traditional induction head. Moreover, the influence mechanism of six external ferrite structural parameters on the heating efficiency was analysed to optimize the pot-type DFSF. It is found that the inner diameter of the ferrite tip has the most significant effect, which can induce a remarkable temperature variation of 310 °C. As a result of optimization, the pot-type DFSF demonstrated an impressive surge of 26% in heating efficiency. Finally, the agreement between the numerical and the experimental temperature proves the accuracy of the model, and the solder joint without defect has been achieved through the pot-type DFSF. This work effectively minimizes the magnetic dispersion and increases the energy utilization efficiency for induction heating, providing new approaches for localized soldering of high-performance power electronic devices.

Keywords: Dual-ferrite synchronous focused; Magnetic dispersion effect; Structure parameters; Induction heating; Energy efficiency (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1016/j.apenergy.2023.121535

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