Induction heating circuits for cooking appliances

(19)

(11)

EP 0 269 414 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: 87310358.4

(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

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Priority:

25.11.1986 GB 8628099

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

(72)	Inventor:
	Lee, Peter William Willingham Cambridge CB4 5HT (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)

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References cited: :

(54)	Induction heating circuits for cooking appliances

(57) An induction heating circuit for a cooking appliance comprises an inverter for powering a pan coil (L2) at values determined by the periods of conduction of a gate turn-off thyristor (S1, VT1). A further inductance (L1) is inclined in series connection with the pan coil (L2) to reduce peak voltages developed during resonance in a resonant circuit including the pan coil (L2). To effect a reduction in the current flow when the thyristor (S1, VT1) is turned on, a snubber comprising a diode (D3) and another inductor (L3) is included.

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