Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2005-06-14
2008-10-28
Nguyen, Matthew V (Department: 2838)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S2090SC, C315S219000, C315S225000, C315S388000, C315S395000, C315S127000, C315S119000, C363S098000, C361S160000
Reexamination Certificate
active
07443106
ABSTRACT:
Circuit with a switch-off device for the operation of light sources The invention relates to a circuit with a switch-off device for the operation of light sources (Lp), have the following features:a self-commutated half-bridge inverter having a series circuit of an upper electronic switch and a lower electronic switch (T1, T2), which are joined at a half-bridge midpoint (M) and are connected between a supply voltage (+) and a ground potential,a start capacitor (C3) which is joined via a trigger element (DIAC) to a control electrode of the lower electronic switch (T2), anda switch-off device having an input (E) and an output, which are configured and connected so that they discharge the start capacitor (C3) if a switch-off signal is applied to the input (E). The switch-off device contains a time delay. In order to be able to keep the components in the time delay small, it is proposed that the switch-off device should comprise two successively connected transistor stages (T3, T4) with bipolar transistors, a first stage (T3) being configured as a collector circuit and a second stage (T4) being configured as an emitter circuit. The second stage (T4) may perferable be used to suppress start pulses.
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European Search Report dated May 17, 2006 from corresponding EP Application No. 05010914.9, 3 pages.
Faccin Marco
Franck Felix
Menegazzi Michele
Bessone Carlo S.
Nguyen Matthew V
Patent-Treuhand-Gesellschaft für Elektrische Glühlampe
Zhang Jue
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