| 摘要 |
The invention relates to a drive circuit for at least one fluorescent lamp ( 10 ) which has the following features: a half-bridge circuit (Q 1 , Q 2 ) for production of a supply voltage (V 2 ), a resonant tuned circuit (L 1 , C 1 ) which is coupled to the half-bridge circuit (Q 1 , Q 2 ) and to which the at least one fluorescent lamp ( 10 ) can be connected, a diagnosis circuit ( 30 ) with a resistance element (R 1 ) which is coupled to the resonant tuned circuit (L 1 , C 1 ), at least one current/voltage converter ( 31 ) which is connected to the resistance element (R 1 ) and produces at least one measurement voltage (V 31 ; V 311 , V 312 ) from a current (I 1 ) flowing through the resistance element, and an evaluation circuit ( 32 ) which is connected to the current/voltage converter ( 31 ) and is supplied with the at least one measurement voltage (V 31 ; V 311 , V 312 ), and to a method for diagnosis of a fluorescent lamp.
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