Global Patent Index - EP 0779768 B1

EP 0779768 B1 2000-05-10 - Circuit for operating a discharge lamp

Title (en)

Circuit for operating a discharge lamp

Title (de)

Schaltungsanordnung zum Betrieb einer Entladungslampe

Title (fr)

Circuit pour alimenter une lampe à décharge

Publication

EP 0779768 B1 (DE)

Application

EP 96118851 A

Priority

DE 19546588 A

Abstract (en)

[origin: EP0779768A2] The load circuit contains the lamp (EL) with a parallel capacitor (C5), a series choke (L2), a capacitor (C6) and a current-measuring resistance (R2). In the preheating phase the load current is measured, an invariant desired value worked out and a clock generator activated at a free-running frequency between the pole values for lamp ignition and extinction. The ignition phase begins with load current measurement and derivation of a variable set-point. The clock generator is synchronised to the invertor frequency. This phase ends with the set-point attaining a value at which the conduction time of a half-bridge exceeds the free-running clock period.

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

H05B 41/295

IPC 8 full level (invention and additional information)

H05B 41/24 (2006.01); H05B 41/295 (2006.01)

CPC (invention and additional information)

H05B 41/295 (2013.01); Y10S 315/05 (2013.01)

Designated contracting state (EPC)

BE DE FR GB IT NL

EPO simple patent family

EP 0779768 A2 19970618; EP 0779768 A3 19971029; EP 0779768 B1 20000510; CA 2192506 A1 19970614; CA 2192506 C 20041116; CN 1155825 A 19970730; CN 1199525 C 20050427; DE 19546588 A1 19970619; JP H09219293 A 19970819; KR 100432541 B1 20040811; US 5828187 A 19981027

INPADOC legal status


2016-10-31 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

2001-05-02 [26N] NO OPPOSITION FILED

2000-08-25 [ET] FR: TRANSLATION FILED

2000-08-09 [GBT] GB: TRANSLATION OF EP PATENT FILED (GB SECTION 77(6)(A)/1977)

- Effective date: 20000714

2000-07-20 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: STUDIO JAUMANN P. & C. S.N.C.

2000-06-15 [REF] CORRESPONDS TO:

- Document: DE 59605182 20000615

2000-05-10 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): BE DE FR GB IT NL

2000-05-10 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7H 05B 41/295 A

1998-03-04 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19980120

1998-01-21 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19971120

1997-10-29 [AK] DESIGNATED CONTRACTING STATES:

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1997-06-18 [AK] DESIGNATED CONTRACTING STATES:

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