Circuit arrangement for operating at least one discharge lamp

Details Circuit arrangement for operating at least one discharge lamp Circuit arrangement for operating at least one discharge lamp

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2317310

The invention relates to a circuit arrangement for operating at least one discharge lamp, which has a half-bridge inverter (T1, T2, A) with a downstream load circuit (LD, CR) and has a half-bridge capacitor (CK) and also a monitoring apparatus for monitoring a change in the voltage drop across the half-bridge capacitor (CK) which is caused by the occurrence of a rectifying action in the at least one discharge lamp LP. According to the invention, the monitoring apparatus has a first RC element (R1, C1) and a second RC element (R2, C2), which are connected to one another by a threshold switch (DC), and means for detecting the switching state of the threshold switch (DC). The first RC element (R1, C1) is connected to the center tap of the half-bridge inverter, and the second RC element (R2, C2) is connected to the half-bridge capacitor (CK).

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