| 摘要 |
The invention relates to circuit arrangements for operating lamps and to operating devices which contain such circuit arrangements. A first stage of a circuit arrangement according to the invention comprises a SEPIC known from the literature. The SEPIC provides a DC voltage which an inverter converts to a radiofrequency AC voltage for lamp operation. According to the invention, an electronic switch (S 1 ) acts both in the SEPIC and in the inverter. Two diodes (D 1 , D 2 ), which are connected into the supply line for the electronic switch (S 1 ), prevent the SEPIC and the inverter from influencing one another.
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