| 摘要 |
The invention relates to a circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with a branch A comprising a series circuit of two switching elements (S1, S2), each switching element being shunted by a unidirectional element (D1, D2), while ends of the branch A are provided with terminals K1 and K2 suitable for connection to poles of a DC voltage source, a load branch B comprising inductive means (L1) and connection terminals (K5, K6) suitable for accommodating a lamp, which load branch shunts one of the switching elements of branch A, a first drive circuit I for generating a first drive signal during stationary lamp operation for rendering each of the switching elements in branch A alternately conducting and non-conducting, whereby each switching element is rendered conducting and non-conducting once in succession within a time interval during which the other switching element is non-conducting. According to the invention, the circuit arrangement is in addition provided with a second drive circuit II coupled to the first drive circuit I for generating a second drive signal for rendering each of the switching elements alternately conducting and non-conducting, whereby each switching element is rendered consecutively conducting and non-conducting more than once within a time interval during which the other switching element is kept in the non-conducting state by the first drive signal. It is achieved by this that a lamp operated on the circuit arrangement has good take-over characteristics, while at the same time the run-up of the lamp is well controllable. <IMAGE> |
