| 摘要 |
The invention relates to an electronic ballast for discharge lamps LA 1 , LA 2 having preheatable electrodes which has a pump circuit D 5 /D 7 , D 6 /D 8 for improving the power factor. In this arrangement, preheating is performed with a converter frequency, raised by comparison with continuous operation, and with the aid of a preheating transformer TR 2.
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