H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 37/00 (2006.01) H05B 39/00 (2006.01)
Patent
CA 2509876
The invention relates to a circuit with a switch-off device for the operation of light sources (Lp), having the following features: .cndot. 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, .cndot. a start capacitor (C3) which is joined via a trigger element (DIAC) to a control electrode of the lower electronic switch (T2), and .cndot. a 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 preferably be used to suppress start pulses.
Faccin Marco
Franck Felix
Menegazzi Michele
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
Smart & Biggar
LandOfFree
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