Input voltage selection method of half-bridge series resonant inverters for all-metal induction heating applications usi
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ORIGINAL ARTICLE
Input voltage selection method of half‑bridge series resonant inverters for all‑metal induction heating applications using high turn‑numbered coils Juil Jin1 · Mina Kim1 · Jinwook Han2 · Kyelyong Kang2 · Jee‑Hoon Jung1 Received: 28 April 2020 / Revised: 24 August 2020 / Accepted: 31 August 2020 © The Korean Institute of Power Electronics 2020
Abstract All-metal induction heating (IH) systems have been introduced to heat both ferromagnetic and non-ferromagnetic pots using dual resonant frequencies. They are designed for heating ferromagnetic pots using a first harmonic operation mode (FHOM) and for heating the non-ferromagnetic pots using a third harmonic operation mode (THOM). All-metal IH systems employing dual resonant frequencies consist of an IH inverter and a power factor correction (PFC) circuit to transfer desired power to pots by increasing the input voltage of the IH inverter. In this paper, the input voltage is designed to obtain an efficiency-optimized operating point. To obtain an appropriate input voltage, power loss analyses are conducted using first harmonic approximation (FHA). Based on analysis results, the input voltage of the IH inverter can be selected to improve its power conversion efficiency. A 2-kW half-bridge series resonant inverter prototype is implemented to verify the effectiveness of the proposed design by heating ferromagnetic pots using the FHOM with a 2-kW transfer power and by heating non-ferromagnetic pots using the THOM with a 1-kW transfer power. Keywords All-metal · Induction heating system · Series resonant inverter · Power loss analysis Abbreviations IH Induction heating FHOM First harmonic operation mode THOM Third harmonic operation mode PFC Power factor correction HB-SRI Half-bridge series resonant inverter FHA First harmonic approximation ESR Equivalent series resistance ZVS Zero-voltage switching Vac Input voltage of the IH system Vdc Input voltage of the HB-SRI Vin Input voltage of the equivalent circuit k Harmonic constant (k = 1 for the FHOM; k = 3 for the THOM) ωsw Angular switching frequency Ir Resonant current |Z| Magnitude of the HB-SRI impedance * Jee‑Hoon Jung [email protected]; [email protected] 1
School of Electrical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Korea
Cooking Control Team, LG Electronics, Changwon, Korea
2
∠Z Phase angle delayed by the HB-SR impedance Ir(rms) Resonant RMS current Isw1(rms) , Isw2(rms) Switch RMS current in the HB-SRI Ic1(rms) , Ic2(rms) Resonant capacitor RMS current in the HB-SRI Pcond Conduction loss of the HB-SRI Rds(on) Switch on resistance Rc Parasitic resistance of the resonant capacitor Rcoil Parasitic resistance of the IH coil Ptr Transfer power of the HB-SRI Gv Voltage gain of the resonant tank Req Equivalent resistance of the HB-SRI impedance Lr Resonant inductance Cr Resonant capacitance Lm Magnetizing inductance Psw(off) Switch turn-off loss Vds Voltage across the switch Isw(Ts/2) Turn-off current of the switch tfall Tur
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