| 摘要 |
<p>A method for controlling a cold-cathode tube in a lighting apparatus, wherein a wider adjustment range of luminance is ensured, and a protection circuit operates normally in the event of disconnection of lead wires or loose fitting of connection connectors during normal operation time to avoid resulting catastrophic failure. A lighting apparatus includes an inverter for providing a current flowing through a cold-cathode tube, an operational section for adjusting luminance, an inverter control circuit which controls the inverter depending on luminance adjusted by the operational section to vary the current flowing through the cold-cathode tube, and a protection circuit to stop operation of the inverter when the current flowing through the cold-cathode tube decreases below the setting value. The method controls the protection circuit never to operate when luminance is set up to be below the luminance threshold in luminance adjustment at the operational section.</p> |
