(19)
(11) EP 2 405 711 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.09.2013 Bulletin 2013/37

(43) Date of publication A2:
11.01.2012 Bulletin 2012/02

(21) Application number: 11184312.4

(22) Date of filing: 26.06.2002
(51) International Patent Classification (IPC): 
H05B 6/06(2006.01)
 H05B 6/14(2006.01)
(84) Designated Contracting States:
BE DE FR GB

(62) Application number of the earlier application in accordance with Art. 76 EPC:
02741342.6 / 1535492

(71) Applicant: Mitsui Engineering and Shipbuilding Co, Ltd.
Tokyo 104-8439 (JP)

(72) Inventors:
  • Uchida, Naoki
    Tamano-shi, Okayama 706-8651 (JP)
  • Kawanaka, Keiji
    Tamano-shi, Okayama 706-8651 (JP)
  • Nanba, Hideyuki
    Tamano-shi, Okayama 706-8651 (JP)
  • Ozaki, Kazuhiro
    Tamano-shi, Okayama 706-8651 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Induction heating method and unit


(57) An induction heating method comprising the steps of supplying a plurality of heating coils with electricity by resonance-type inverters respectively corresponding to said heating coils with one of said resonance-type inverters being a main inverter and another being a subordinate inverter, driving said subordinate inverter in such a manner that a phase of a current supplied to said heating coil on a subordinate side is synchronized with a phase of a current supplied to said heating coil on said main side or maintained at a phase difference to be set, based on a drive signal of said main inverter or an output voltage or an output current of said main inverter.







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