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