| 摘要 |
<p>The ballast has a pump circuit and a preheating transformer (TR2) supplying preheating power to preheatable electrodes connected to a secondary side of a discharge lamp. The ballast operates a converter during preheating with a frequency raised by comparison with open circuit resonant frequency of the ballast to supply a primary side of the transformer, during a preheating phase before the lamp is ignited. An independent claim is also included for a method for operating a discharge lamp.</p> |
