| 摘要 |
The invention relates to an adaptation circuit (3) for operating a high-pressure discharge lamp (1) via a controlled semiconductor switch (4) in series with the lamp (1). The control circuit for the switch (4) is constituted by a voltage division circuit (5, 6). According to the invention, the voltage division circuit (5, 6) is connected in parallel with the switch (4) in the state in which the lamp (1) is connected and one branch of the voltage division circuit (5, 6) comprises a parallel-combination of a capacitor (57) and a resistor (56). Thus, it is achieved that the variation of the voltage across the lamp (1) influences the control of the semiconductor switch (4), while it proves to be possible to stabilize for the major part the power dissipated by the lamp (1) against variation in the supply voltage and against lamp voltage variations during the life of the lamp. |
