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Parasitic Capacitance Analysis of PCB-type Induction Heating Coil and LCCC/S Matching Network Design for Railway Turnouts

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Abstract

Conventional de-icing systems use resistive heating wires to prevent the freezing of railway turnouts. Because of the low efficiency of the heating wires, induction heating (IH) systems have been investigated recently. The IH systems utilize high-frequency resonant inverters and heating coils to induce eddy currents and heat energy on heating plates. The heating coils can be manufactured with a printed-circuit-board (PCB) process. However, a short distance between PCB patterns can generate a significant parasitic capacitance, which resonates with the coil inductance. A self-resonance of the coil makes capacitive impedance at high-frequency ranges and distorts coil currents. This paper investigates the parasitic capacitance of PCB-type induction heating coils. Analytic models of the PCB-type heating coil are derived. In addition, a new LCCC/S impedance matching network (IMN) design that compensates for the parasitic capacitance is presented. The developed induction heating coil and IMN are demonstrated using experimental results.

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Acknowledgements

This work is supported by Korea Agency for Infrastructure Technology Advancement grant funded by Ministry of Land, Infrastructure and transport. (RS-2018-KA146020).

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Authors and Affiliations

  1. School of Railroad Engineering, Korea National University of Transportation, Ui-wang, 16106, Korea

    Chan-Bae Park, Jae-Bum Lee & Hyung-Woo Lee

  2. Department of Electrical Engineering, Hanyang University, Seoul, 04763, Korea

    Hyeong-Seok Oh & Ju Lee

  3. School of Electrical and Computer Engineering, University of Seoul, Seoul, 02504, South Korea

    Jaehong Lee & Seung-Hwan Lee

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  1. Hyeong-Seok Oh
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Oh, HS., Lee, J., Lee, SH. et al. Parasitic Capacitance Analysis of PCB-type Induction Heating Coil and LCCC/S Matching Network Design for Railway Turnouts. J. Electr. Eng. Technol. 18, 3311–3320 (2023). https://doi.org/10.1007/s42835-022-01372-0

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