EP 0208083 A3 19870318 - DIMMER CIRCUIT FOR AN ELECTRONIC BALLAST CIRCUIT FOR A FLUORESCENT LAMP
Title (en)
DIMMER CIRCUIT FOR AN ELECTRONIC BALLAST CIRCUIT FOR A FLUORESCENT LAMP
Publication
Application
Priority
DE 3524681 A 19850711
Abstract (en)
[origin: EP0208083A2] The ballast circuit (10a) is provided with a storage device (18) which contains details of the rated current of the associated fluorescent lamp. These details are supplied to a multiplier (19) which also receives a control signal from a control circuit (20). The output signal of the multiplier (19) is used for generating a reference voltage (Uref) which controls the lamp current of the ballast circuit. A plurality of ballast circuits (10a, 10b), which are fitted with lamps of different power, can be controlled by a common control circuit (20), each of the connected lamps being operated with a current which corresponds to a specific percentage proportion of the rated current. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/298 (2006.01); H05B 41/392 (2006.01)
CPC (source: EP)
H05B 41/2988 (2013.01)
Citation (search report)
- [Y] FR 2408273 A1 19790601 - WIDMAYER FREDERICK [US]
- [Y] US 4039897 A 19770802 - DRAGOSET JAMES E
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0208083 A2 19870114; EP 0208083 A3 19870318; EP 0208083 B1 19910102; AT E59754 T1 19910115; DE 3524681 A1 19870122; DE 3524681 C2 19880714; DE 3676363 D1 19910207
DOCDB simple family (application)
EP 86106303 A 19860507; AT 86106303 T 19860507; DE 3524681 A 19850711; DE 3676363 T 19860507