| 摘要 |
A circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with a branch comprising a series circuit of two switching elements, each switching element being shunted by a unidirectional element, while ends of the branch are provided with connection terminals suitable for connection to poles of a DC voltage source, a load branch comprising inductive means and lamp connection connection terminals suitable for accommodating a lamp, which load branch shunts one of the switching elements of branch. A first drive circuit I for generating a first drive signal during stationary lamp operation for rendering each of the switching elements in the branch 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. 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. 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.
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