Global Patent Index - EP 0863368 A3

EP 0863368 A3 2000-04-19 - Flame monitoring circuit for a burner with a glow ignitor

Title (en)

Flame monitoring circuit for a burner with a glow ignitor

Title (de)

Flammenüberwachungsschaltung für einen Brenner mit Glühzünder

Title (fr)

Circuit de surveillance de flamme pour un brûleur avec allumage à incandescence

Publication

EP 0863368 A3 (DE)

Application

EP 98103582 A

Priority

DE 19709091 A

Abstract (en)

[origin: DE19709091C1] The circuit uses the temperature-dependent resistance variation in a glow plug (GL) for indicating the presence of the flame. The glow plug is inserted in a self-balancing bridge circuit (R1,R2,R3,GL), with the size of the current required for balancing the current through the glow plug used as the flame indication signal. The bridge circuit may be coupled to the current supply lines (PS1,PS2) via a controlled resistance (Q), controlled by the voltage across the bridge diagonal.

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

F23N 5/14; F23Q 7/12

IPC 8 full level (invention and additional information)

F23N 5/14 (2006.01); F23Q 7/12 (2006.01)

CPC (invention and additional information)

F23Q 7/12 (2013.01); F23N 5/143 (2013.01); F23N 2027/38 (2013.01); F23N 2029/00 (2013.01)

Citation (search report)

Designated contracting state (EPC)

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

EPO simple patent family

DE 19709091 C1 19980514; EP 0863368 A2 19980909; EP 0863368 A3 20000419

INPADOC legal status


2000-09-20 [18W] WITHDRAWN

- Date of withdrawal: 20000511

2000-05-10 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000310

2000-04-19 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

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

2000-04-19 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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

2000-04-19 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7F 23N 5/14 A, 7F 23Q 7/12 B

1998-09-09 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

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

1998-09-09 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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