(19)
(11) EP 0 269 415 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.01.1989 Bulletin 1989/02

(43) Date of publication A2:
01.06.1988 Bulletin 1988/22

(21) Application number: 87310359.2

(22) Date of filing: 24.11.1987
(51) International Patent Classification (IPC)4: H05B 6/12, H05B 6/06
(84) Designated Contracting States:
BE DE ES FR GB IT NL

(30) Priority: 25.11.1986 GB 8628100

(71) Applicant: CREDA LIMITED
Stoke-on-Trent Staffordshire, ST11 9LJ (GB)

(72) Inventors:
  • Coppin, Julian
    Cambridge CB1 3AX (GB)
  • Downham, Francis
    Essex CB11 3EJ (GB)

(74) Representative: Waters, Jeffrey 
The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Induction heating circuits forcooking appliances


    (57) In an induction heating circuit for a cooking appliance, a pan sensing circuit (7) responds to current flow through a pan heating coil (L2) and inhibits the turning-on of a gate turn-off thryistor (VT1) controlling energisation of the pan coil (L2). In the event that the sensing circuit (7) indicates that a suitable utensil is located over the pan coil (L2), energisation of the latter is allowed, otherwise energisation is inhibited. An interrogation circuit (11) allows energisation at preset intervals during which sensing continues.







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