家庭用IH調理器への応用を目的とした簡易型PFC機能を持つ2ステージソフトスイッチング高周波インバータ

摘要

In recent years, consumer induction-heating (IH) cooking appliances have grown increasingly popular because of their easy cleaning, high efficiency, safety, and controllability. IH food cooking system for consumer home use are indispensable to heat various metallic pans, such as aluminum, copper, stainless steel, and iron cast for further diffusing. Furthermore, these appliances have to satisfy the utility AC grid harmonics regulations of IEC61000-3-2. To meet these requirements, this paper proposes a two-stage soft-switching high-frequency inverter with simple PFC function that is suitable for consumer IH cooking appliances. The proposed system comprises a soft-switching chopper based boost PFC converter with passive snubber and phase-shifted PWM controlled ZVZCS high-frequency inverter. In order to satisfy the utility AC grid current harmonic regulations, a simple PFC control technique with discontinuous current mode is introduced. This technique as well as the fundamental operating performances of the proposed IH system is tested. The effectiveness of proposed IH system is substantially proved from a practical point of view on the basis of the experimental results.%家庭用誘導加熱調理器（以後IH調理器）は火を使わずrn被加熱物体を直接加熱するため，安全，快適，高い加熱効rn率といった特長を活かして近年急速に普及している。さらrnに，普及初期のIH調理器では銅やアルミといった非磁性rnかつ低抵抗率材質の加熱は困難であり使用可能な銅材質にrn制限があるという課題があったが，現在では鉄やステンレrnスをはじめ，銅やアルミなど様々な材質の鍋への対応（負rn荷のオールメタル対応化）が進められている。