| 摘要 |
The invention relates to a ballast for a discharge lamp whose operating reliability is improved with respect to traditional ballasts, particularly in the case of ignition of the discharge lamp. According to the invention, the ballast has a swept-frequency generator (2), connected to the DC-AC invertor (1) which varies the variable operating frequency of the invertor (1) in order to achieve reliable ignition of the discharge lamp. As a result of this self- varying operating frequency of the invertor (1), the resonant frequency of a series resonant circuit (3) which produces the ignition voltage is safely reached even when this is incorrectly tuned as a result of capacitive loads in the load circuit of the invertor. The invention can be used for the operation of discharge lamps, particularly those in vehicles. <IMAGE> |
