Circuit arrangement for operating at least one discharge lamp

H - Electricity – 05 – B

Patent

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Details

H05B 41/28 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2295172

The invention relates to a circuit configuration for operating at least one discharge lamp (LP) on a half bridge inverter (Q1, Q2), comprising at least one coupling condenser (C3) and a shut-off device (T1, A) which durably disconnects the half bridge inverter (Q1, Q2) when the lamp (LP) lights up with difficulty. According to the invention, the circuit configuration has means (V1, V2) for monitoring voltage drops on the at least one coupling condenser (C3) and for activating the shut-off device (T1, A) depending on the voltage drop detected in the at least one coupling condenser (C3). When the voltage in the coupling condenser (C3) clearly deviates for its normal value, for instance, due to the emergence of the rectifying effect at the end of the service life of the discharge lamp (LP), the half bridge inverter (Q1, Q2) is shut down by the shut-off device (T1, A).

L'invention concerne un circuit permettant d'actionner au moins une lampe à décharge (LP) sur un onduleur à demi-ponts (Q1, Q2), comprenant au moins un condensateur de liaison (C3) et un dispositif de déconnexion (T1, A) qui déconnecte de manière durable l'onduleur à demi-ponts (Q1, Q2) lorsque la lampe s'allume difficilement. Selon l'invention, le circuit comprend des éléments (V1, V2) permettant de surveiller une chute de tension au niveau du condensateur de liaison (C3) (au moins au nombre de un) et d'activer le dispositif de déconnexion (T1, A) en fonction de la chute de tension détectée sur le condensateur de liaison (C3) (au moins au nombre de un). Si la tension s'écarte nettement d'une valeur normale au niveau du condensateur de liaison (C3), par exemple en raison de l'apparition d'un effet de redressement à la fin de la durée de vie de la lampe à décharge (LP), l'onduleur à demi-ponts (Q1, Q2) est arrêté à l'aide du dispositif de déconnexion (T1, A).

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