| 摘要 |
A lighting circuit of confirming the insulation property of an HID lamp and a lighting circuit upon starting the operation of the HID lamp to previously prevent damages of the main circuit, and starting discharge at the lowest starting voltage in accordance with the characteristics of the HID lamp, comprising a control section (C) having an insulation property confirming means for confirming that the current does not flow in a state of applying a predetermined voltage to the main circuit (2) before applying the starting voltage to an HID lamp (1) and a starting voltage variable control means for increasing the secondary voltage generated from the step-up transformer (10) of the starting circuit (3) stepwise after confirming the insulation property. <IMAGE> |
