EP 0411618 B1 19940302 - Electronic ballast for gas discharge lamps.
Title (en)
Electronic ballast for gas discharge lamps.
Title (de)
Elektronisches Vorschaltgerät für Gasentladungslampen.
Title (fr)
Ballast électronique pour lampes à décharge dans un gaz.
Publication
Application
Priority
DE 3925899 A 19890804
Abstract (en)
[origin: EP0411618A2] An electronic ballast (1) for gas discharge lamps (2), having an input circuit part (10, 11) for producing an intermediate-circuit DC voltage (Uz) from a supply voltage (L1,N), having an oscillator circuit part (4,8,S1,S2), supplied from the intermediate circuit DC voltage (Uz) for generating an alternating signal (uw) which can be supplied to the gas discharge lamp (2), having a bistable switch-off latching circuit part (3) which supplies a switch-off signal (us) in its first and second stable state to the oscillator circuit part (4,8,S1,S2), and hence releases the oscillator circuit part (4,8,S1,S2) or switches it off, a first signal (u1), derived from the alternating signal (uw), driving the switch-off latching circuit part (3) from its first into its second stable state in the event of a predetermined value being exceeded, and generating the switch-off signal (us), is to be designed such that its operating reliability is further improved. This is achieved in that a further signal (u2), derived from the intermediate circuit DC voltage (Uz), produces the switch-off signal (us) when the intermediate circuit DC voltage (Uz) exceeds a predetermined maximum value. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/285 (2006.01); H05B 41/298 (2006.01)
CPC (source: EP)
H05B 41/2983 (2013.01); H05B 41/2985 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0411618 A2 19910206; EP 0411618 A3 19920722; EP 0411618 B1 19940302; AT E102429 T1 19940315; DE 3925899 A1 19910207; DE 59004747 D1 19940407; DK 0411618 T3 19940328; ES 2050897 T3 19940601; FI 903809 A0 19900731; FI 96657 B 19960415; FI 96657 C 19960725; NO 177210 B 19950424; NO 177210 C 19950802; NO 903421 D0 19900803; NO 903421 L 19910205
DOCDB simple family (application)
EP 90114792 A 19900801; AT 90114792 T 19900801; DE 3925899 A 19890804; DE 59004747 T 19900801; DK 90114792 T 19900801; ES 90114792 T 19900801; FI 903809 A 19900731; NO 903421 A 19900803