Global Patent Index - EP 1049358 A2

EP 1049358 A2 2000-11-02 - Electric heater assembly

Title (en)

Electric heater assembly

Title (de)

Elektrische Heizungsanordnung

Title (fr)

Dispositif de chauffage électrique

Publication

EP 1049358 A2 (EN)

Application

EP 00303417 A

Priority

GB 9909636 A

Abstract (en)

An electric heater assembly comprises at least one electric heater, each of which incorporates at least one sensing means (8) for use in detecting a cooking vessel (9) on a cooking plate (7) overlying the heater. The sensing means (8) is provided for the purpose of effecting selective energising and/or de-energising of one or more electric heating elements (3) in the or each heater. The or each sensing means (8) comprises an electrically conductive sensor loop. The or each sensor loop is connected to a circuit (100) comprising a non-oscillatory resonant circuit (102, 103), for the or each sensor loop, driven by an oscillatory circuit (101) such that the or each resonant circuit is operated at within +/- 15 percent of its resonant frequency, the resonant circuit not forming part of the oscillatory circuit (101). A transformer (104, 105, 106), associated with the or each sensor loop (8), has a first winding (105) connected in the resonant circuit and a second winding (106) connected to, or integral with, its associated sensor loop (8). Means (110, 111) is provided to monitor change in a parameter associated with electric current in and voltage across the or each resonant circuit (102, 103) as a result of placement and/or removal of a cooking vessel (9) on and/or from the cooking plate (7) and to effect selective energising and/or de-energising of one or more electric heating elements (3) in the or each heater. <IMAGE>

IPC 1-7 (main, further and additional classification)

H05B 3/74

IPC 8 full level (invention and additional information)

H05B 3/74 (2006.01)

CPC (invention and additional information)

H05B 3/746 (2013.01); H05B 2213/05 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1049358 A2 20001102; EP 1049358 A3 20031001; GB 2349471 A 20001101; GB 2349471 B 20030806; GB 9909636 D0 19990623

INPADOC legal status


2004-12-29 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040402

2004-07-29 [REG DE 8566] DESIGNATED COUNTRY DE NOT LONGER VALID

2004-06-23 [AKX] PAYMENT OF DESIGNATION FEES

2003-10-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2003-10-01 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Countries: AL LT LV MK RO SI

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-11-02 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI