| 摘要 |
<p>The invention relates to a circuit arrangement for operating a discharge lamp, comprising input terminals for connection to a supply voltage source, a load branch B provided with terminals for holding the discharge lamp and with inductive ballast means, means I coupled to ends of the load branch B and the input terminals to generate a high-frequency voltage from the supply voltage furnished by the supply voltage source, means II coupled to the means I to adjust the power consumed by the discharge lamp, the frequency of the high-frequency voltage being dependent upon the adjusted value of the power consumption, a transformer having and secondary windings, each secondary winding being shunted by an electrode branch during lamp operation, which electrode branch includes an electrode of the discharge lamp, and having a primary winding. According to the invention the circuit arrangement is characterized in that the primary winding forms part of a branch C which also includes a frequency-dependent impedance and which shunts the load branch. Thus, it is achieved that a desired relationship exists between the heating currents through the electrodes and the discharge current over a wide range of the power consumed by the discharge lamp. <IMAGE></p> |
